Network device and optical network

Abstract

Embodiments of the present application provide a network device and an optical network, and relate to the technical field of optical communication. The network device can select a working path and a protection path for an optical signal of any wavelength. The network device comprises a first wavelength selective switch and a light source. A plurality of first branch ports of the first wavelength selective switch are connected with a plurality of optical fibers respectively, and the plurality of optical fibers comprise a first optical fiber and a second optical fiber. The light source outputs a detection optical signal. The first wavelength selective switch receives a first transmission optical signal through a first common port and receives the detection optical signal through a second common port. In a case where the first optical fiber is normal, the first wavelength selective switch outputs a first optical signal in the first transmission optical signal to the first optical fiber and outputs the detection optical signal to the second optical fiber. The wavelength of the detection optical signal is different from the wavelength of the first optical signal. In a case where the first optical fiber is faulty, the first wavelength selective switch outputs the first optical signal to the second optical fiber and outputs the detection optical signal to the first optical fiber.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to a network device and an optical network. Background Technology

[0002] An optical network comprises multiple network devices connected by optical fibers, including a first network device and a second network device. A protection switching mechanism is established between the first and second network devices. Specifically, the first network device includes an optical splitter, and the second network device includes an optical switch. The first output of the optical splitter is connected to the first input of the optical switch via a first optical fiber, and the second output of the optical splitter is connected to the second input of the optical switch via a second optical fiber. When the service optical signal output from the first network device needs to be transmitted to the second network device, the optical splitter splits the service optical signal output from the first network device into a first part and a second part of the optical signal according to a 50:50 splitting ratio. The first part of the optical signal is transmitted to the second network device via the first optical fiber, and the second part of the optical signal is transmitted to the second network device via the second optical fiber. The second network device connects the first input and output of the optical switch to receive the first part of the optical signal, or connects the second input and output of the optical switch to receive the second part of the optical signal.

[0003] In cases where multiple service optical signals need to be transmitted separately to the first and second optical fibers, multiple optical splitters are required in the first network device, and multiple optical switches are required in the second network device. Furthermore, since the optical switches are fixedly connected via the first and second optical fibers, only the first and second optical fibers can form a protection relationship, and this protection relationship cannot be changed. Summary of the Invention

[0004] Embodiments of this application provide a network device and an optical network, which can select a working path and a protection path for optical signals of any wavelength.

[0005] In a first aspect, a network device is provided, comprising: a first wavelength selective switch and a light source. The first wavelength selective switch includes a first common port, a second common port, and multiple first branch ports. The second common port is connected to the light source. The multiple first branch ports are respectively connected to multiple optical fibers, including first optical fibers and second optical fibers. The light source outputs a detection optical signal. The first wavelength selective switch receives a first transmitted optical signal through the first common port and a detection optical signal through the second common port. When the first optical fiber is functioning normally, the first wavelength selective switch outputs a first optical signal from the first transmitted optical signal to the first optical fiber and outputs a detection optical signal to the second optical fiber. The wavelength of the detection optical signal is different from the wavelength of the first optical signal. When the first optical fiber is faulty, the first wavelength selective switch outputs a first optical signal to the second optical fiber and outputs a detection optical signal to the first optical fiber. In this optional embodiment, the first transmitted optical signal includes multiple service optical signals with different wavelengths, and the first optical signal in the first transmitted optical signal can be one or more service optical signals from the first transmitted optical signal. When the first optical fiber is functioning normally, the first wavelength selection switch outputs the first optical signal from the first transmitted optical signal to the first optical fiber and a detection optical signal to the second optical fiber. When the first optical fiber fails, the first wavelength selection switch outputs the first optical signal to the second optical fiber and a detection optical signal to the first optical fiber. Therefore, the working path of the first optical signal is the first optical fiber, and the protection path is the second optical fiber. Furthermore, the first wavelength selection switch can connect to multiple optical fibers, including both the first and second optical fibers. This means that the network device can use the first wavelength selection switch to select the working and protection paths for any service optical signal in the first transmitted optical signal, avoiding the need for multiple optical splitters to transmit the service optical signal to the working and protection paths, thus improving the integration of the network device. The working and protection paths selected for a specific wavelength of service optical signal can be the same or different at different times, making protection switching highly flexible. Additionally, when the first optical fiber is functioning normally, it transmits the first optical signal, and the first wavelength selection switch outputs a detection optical signal to the second optical fiber, illuminating the second optical fiber, facilitating the detection of whether the second optical fiber is functioning normally and improving the success rate of protection switching. In the event of a failure in the first optical fiber, the second optical fiber transmits the first optical signal, and the first wavelength selection switch outputs a detection optical signal to the first optical fiber to facilitate timely detection that the first optical fiber has returned to normal.

[0006] Optionally, the multiple optical fibers also include a third optical fiber; the first wavelength selection switch is further used to output a second optical signal from the first transmitted optical signal to the third optical fiber when the third optical fiber is functioning normally; the wavelengths of the first optical signal and the second optical signal are different, and the wavelength of the detection optical signal is also different from the wavelength of the second optical signal; the first wavelength selection switch is further used to output a second optical signal to the second optical fiber and a detection optical signal to the third optical fiber when the third optical fiber fails. In this optional configuration, the second optical signal in the first transmitted optical signal can be any service optical signal in the first transmitted optical signal, and the wavelengths of the first optical signal and the second optical signal are different. Therefore, the network device can use the first wavelength selection switch to select different working paths and the same protection path for service optical signals with different wavelengths in the first transmitted optical signal, improving the flexibility of the network device.

[0007] Optionally, the first wavelength selection switch is specifically used to output a first detection optical signal from the detection optical signal to the first fiber and a second detection optical signal from the detection optical signal to the third fiber when both the first and third optical fibers are faulty; the first and second detection optical signals have different wavelengths. Alternatively, the first wavelength selection switch is specifically used to output detection optical signals to both the first and third optical fibers in a time-division multiplexing manner when both the first and third optical fibers are faulty. In this optional mode, when the first wavelength selection switch outputs the first detection optical signal from the detection optical signal to the first fiber and the second detection optical signal from the detection optical signal to the third fiber, it indicates that the light source is a broadband light source. Such a light source can simultaneously output detection optical signals of different wavelengths to multiple optical fibers, resulting in high detection efficiency. When the first wavelength selection switch outputs detection optical signals to both the first and third optical fibers in a time-division multiplexing manner, it indicates that the light source is a fixed-wavelength light source, requiring the first wavelength selection switch to output detection optical signals to multiple optical fibers in a time-division multiplexing manner.

[0008] Optionally, the multiple optical fibers also include a third optical fiber; the first wavelength selection switch is further configured to output a second optical signal from the first transmitted optical signal to the first optical fiber and a detection optical signal to the third optical fiber when the first optical fiber is functioning normally; the wavelengths of the first optical signal and the second optical signal are different, and the wavelength of the detection optical signal is also different from the wavelength of the second optical signal; the first wavelength selection switch is further configured to output a second optical signal to the third optical fiber when the first optical fiber fails. In this optional configuration, the second optical signal in the first transmitted optical signal can be any service optical signal in the first transmitted optical signal, and the wavelengths of the first optical signal and the second optical signal are different. Therefore, the network device can use the first wavelength selection switch to select the same working path and different protection paths for service optical signals with different wavelengths in the first transmitted optical signal, improving the flexibility of the network device.

[0009] Optionally, the first wavelength selection switch is specifically used to output a first detection optical signal from the detection optical signal to the second optical fiber and a second detection optical signal from the detection optical signal to the third optical fiber when the first optical fiber is functioning normally, wherein the wavelengths of the first and second detection optical signals are different; or, the first wavelength selection switch is used to output detection optical signals to the second and third optical fibers in a time-division manner when the first optical fiber is functioning normally. In this optional mode, when the first wavelength selection switch outputs the first detection optical signal from the detection optical signal to the first optical fiber and the second detection optical signal from the detection optical signal to the third optical fiber, it indicates that the light source is a broadband light source, which can simultaneously output detection optical signals to multiple optical fibers, resulting in high detection efficiency. When the first wavelength selection switch outputs detection optical signals to the first and third optical fibers in a time-division manner, it indicates that the light source is a fixed-wavelength light source, requiring the first wavelength selection switch to output detection optical signals to multiple optical fibers in a time-division manner.

[0010] Optionally, the network device further includes a second wavelength selection switch, which includes a third common port and multiple second branch ports. The multiple second branch ports are respectively connected to multiple optical fibers. The second wavelength selection switch is used to receive a second transmitted optical signal through the third common port, and, when the first optical fiber is functioning normally, outputs a third optical signal from the second transmitted optical signal to the first optical fiber. The wavelength of the third optical signal is different from the wavelength of the first optical signal, and the wavelength of the detection optical signal is different from the wavelength of the third optical signal. The second wavelength selection switch is also used to output a third optical signal to the second optical fiber in the event of a fault in the first optical fiber. In this optional configuration, the first and second wavelength selection switches can, for example, be wavelength selection switches in different directions, and the wavelength selection switch in either direction can be configured to select the working path and protection path for any service optical signal in the transmitted optical signal input in that direction.

[0011] Optionally, the network equipment further includes a first optical device and a second optical device. The first optical device includes a fourth common port, a third branch port, and a fourth branch port. The fourth common port is connected to the third branch port, and the fourth branch port is connected to the fourth branch port. The third branch port is connected to one first branch port of a first wavelength selective switch, and the fourth branch port is connected to one second branch port of a second wavelength selective switch. The fourth common port is connected to a first optical fiber. The second optical device includes a fifth common port, a fifth branch port, and a sixth branch port. The fifth common port is connected to the fifth branch port, and the fifth common port is connected to the sixth branch port. The fifth branch port is connected to another first branch port of the first wavelength selective switch, and the sixth branch port is connected to another second branch port of the second wavelength selective switch. The fifth common port is connected to a second optical fiber. In this optional configuration, the first optical device includes a wavelength selective switch or a beam splitter, and the second optical device includes a wavelength selective switch or a beam splitter.

[0012] Optionally, the network device also includes a multiplexer; the multiplexer is connected to the first common port of the first wavelength selection switch; the multiplexer is used to output a first transmission optical signal to the first wavelength selection switch.

[0013] Secondly, a network device is provided, including: a third wavelength selective switch and a detection device. The third wavelength selective switch includes a sixth common port, a seventh common port, and multiple seventh branch ports. The seventh common port is connected to the detection device. The multiple seventh branch ports are respectively connected to multiple optical fibers, including a first optical fiber and a second optical fiber. The third wavelength selective switch is used to output a first optical signal received through the first optical fiber from the sixth common port when the first optical fiber is normal, and to transmit a detection optical signal received through the second optical fiber to the detection device. The wavelength of the detection optical signal is different from the wavelength of the first optical signal. The third wavelength selective switch is also used to output the first optical signal received through the second optical fiber from the sixth common port when the first optical fiber is faulty, and to transmit the detection optical signal received through the first optical fiber to the detection device. The detection device is used to determine whether the optical fiber transmitting the detection optical signal is normal based on the received detection optical signal. In this network device, since the third wavelength selective switch outputs the first optical signal received through the first optical fiber from the sixth common port when the first optical fiber is normal, and outputs the first optical signal received through the second optical fiber from the sixth common port when the first optical fiber is faulty, it can be seen that the working path of the first optical signal is the first optical fiber, and the protection path of the first optical signal is the second optical fiber. The third wavelength selection switch is connected to multiple optical fibers, including the first and second optical fibers. This network device can receive the first optical signal transmitted through either the first or second optical fiber via the third wavelength selection switch, avoiding the need for multiple optical switches to receive the signal and improving the network device's integration. Furthermore, when the first optical fiber is functioning normally, it transmits the first optical signal. The third wavelength selection switch then transmits the received detection optical signal to the detection device, allowing the device to determine the condition of the second optical fiber and improve the success rate of protection switching. In the event of a fault in the first optical fiber, the third wavelength selection switch transmits the received detection optical signal to the detection device, enabling the device to promptly detect when the first optical fiber has recovered.

[0014] Optionally, the multiple optical fibers also include a third optical fiber; the third wavelength selection switch is further used to output the second optical signal received through the third optical fiber from the sixth common port when the third optical fiber is functioning normally; the wavelengths of the first optical signal and the second optical signal are different, and the wavelength of the detection optical signal is different from the wavelength of the second optical signal; the third wavelength selection switch is also used to output the second optical signal received through the second optical fiber from the sixth common port when the third optical fiber fails, and to transmit the detection optical signal received through the third optical fiber to the detection device. In this optional method, the network device can receive the second optical signal transmitted through the third optical fiber or the second optical fiber through the third wavelength selection switch, which provides high flexibility for the network device.

[0015] Optionally, a third wavelength selection switch is used, in the event of a failure in both the first and third optical fibers, to transmit a first detection optical signal received through the first optical fiber to the detection device, and a second detection optical signal received through the third optical fiber to the detection device; the detection optical signals include the first and second detection optical signals, and the wavelengths of the first and second detection optical signals are different; or, in the event of a failure in both the first and third optical fibers, the third wavelength selection switch is used to transmit the detection optical signals received through the first and third optical fibers to the detection device in a time-division multiplexing manner. In this optional method, when the third wavelength selection switch transmits the first detection optical signal received through the first optical fiber to the detection device, and the second detection optical signal received through the third optical fiber to the detection device, the detection device can simultaneously detect multiple optical fibers, resulting in high detection efficiency. When the third wavelength selection switch transmits the detection optical signals received through the first and third optical fibers to the detection device in a time-division multiplexing manner, it indicates that the detection device is detecting multiple optical fibers in a time-division multiplexing manner.

[0016] Optionally, the multiple optical fibers also include a third optical fiber; a third wavelength selection switch is used to output the second optical signal received through the first optical fiber from the sixth common port when the first optical fiber is functioning normally, and to transmit the detection optical signal received through the third optical fiber to the detection device; the wavelengths of the first optical signal and the second optical signal are different, and the wavelength of the detection optical signal is different from the wavelength of the second optical signal; the third wavelength selection switch is also used to output the second optical signal received through the third optical fiber from the sixth common port when the first optical fiber fails. In this optional configuration, the network device can receive the second optical signal transmitted through either the first or third optical fiber via the third wavelength selection switch, providing greater flexibility for the network device.

[0017] Optionally, a third wavelength selection switch is used, when the first optical fiber is functioning normally, to transmit the first detection optical signal received through the second optical fiber to the detection device, and the second detection optical signal received through the third optical fiber to the detection device; the detection optical signal includes the first detection optical signal and the second detection optical signal, the first detection optical signal and the second detection optical signal having different wavelengths; or, the third wavelength selection switch is used, when the first optical fiber is functioning normally, to transmit the detection optical signals received through the second optical fiber and the third optical fiber to the detection device in a time-division manner. In this optional method, when the third wavelength selection switch transmits the first detection optical signal received through the second optical fiber to the detection device, and the second detection optical signal received through the third optical fiber to the detection device, the detection device can simultaneously detect multiple optical fibers, resulting in high detection efficiency. When the third wavelength selection switch transmits the detection optical signals received through the second optical fiber and the third optical fiber to the detection device in a time-division manner, it indicates that the detection device performs time-division detection on multiple optical fibers.

[0018] Optionally, the network device further includes a fourth wavelength selection switch, which includes an eighth common port and multiple eighth branch ports; the multiple eighth branch ports are respectively connected to multiple optical fibers; the fourth wavelength selection switch is used to output the third optical signal received through the first optical fiber from the eighth common port when the first optical fiber is normal; the wavelength of the third optical signal is different from the wavelength of the first optical signal, and the wavelength of the detected optical signal is different from the wavelength of the third optical signal; the fourth wavelength selection switch is also used to output the third optical signal received through the second optical fiber from the eighth common port when the first optical fiber fails. In this optional embodiment, the third wavelength selection switch and the fourth wavelength selection switch can be wavelength selection switches in different directions, and the wavelength selection switch in either direction can receive the optical signal transmitted through the first optical fiber or the second optical fiber.

[0019] Optionally, the network equipment also includes a third optical device and a fourth optical device; the third optical device includes a ninth common port, a ninth branch port, and a tenth branch port, the ninth common port is connected to the ninth branch port, the ninth common port is connected to the tenth branch port, the ninth branch port is connected to a seventh branch port of the third wavelength selection switch, the tenth branch port is connected to an eighth branch port of the second wavelength selection switch, and the ninth common port is connected to the first optical fiber; the fourth optical device includes a tenth common port, an eleventh branch port, and a twelfth branch port, the tenth common port is connected to the eleventh branch port, the tenth common port is connected to the twelfth branch port, the eleventh branch port is connected to another seventh branch port of the third wavelength selection switch, the twelfth branch port is connected to another eighth branch port of the fourth wavelength selection switch, and the tenth common port is connected to the second optical fiber.

[0020] Optionally, the network device also includes a wavelength divider; the wavelength divider is connected to the sixth common port of the third wavelength selection switch; the wavelength divider is used to transmit optical signals of different wavelengths in the received optical signal to different locations.

[0021] Thirdly, an optical network is provided, comprising: a first network device, a second network device, and a plurality of optical fibers connecting the first network device and the second network device, the plurality of optical fibers including the first optical fiber and the second optical fiber, the first network device including the network device as described in any of the first aspects above, and the second network device including the network device as described in any of the second aspects above.

[0022] The technical effects of any possible implementation of the third aspect can be seen in the technical effects of different implementations of the first or second aspect mentioned above, and will not be repeated here.

[0023] Fourthly, a network device is provided, comprising: a first wavelength selective switch, the first wavelength selective switch including a first common port and a plurality of first branch ports; the plurality of first branch ports are respectively connected to a plurality of optical fibers, the plurality of optical fibers including first optical fibers and second optical fibers. The first wavelength selective switch receives a first transmitted optical signal through the first common port; the first wavelength selective switch outputs a first portion of the first optical signal from the first transmitted optical signal to the first optical fiber, and outputs a second portion of the first optical signal from the first optical signal to the second optical fiber. In this optional mode, the first wavelength selective switch is used to output the first portion of the first optical signal from the first transmitted optical signal to the first optical fiber, and output the second portion of the first optical signal from the first transmitted optical signal to the second optical fiber. The operating path of the first optical signal is the first optical fiber, and the protection path of the first optical signal is the second optical fiber. The first optical signal can be any service optical signal in the first transmitted optical signal. The first wavelength selection switch is connected to multiple optical fibers, including the first optical fiber and the second optical fiber. Therefore, this network device can use the first selection switch to select the working path and protection path for any service optical signal in the first transmitted optical signal, transmitting the first part of the service optical signal to the working path and the second part to the protection path. This avoids the need for multiple optical splitters in the network device to select the working and protection paths, improving the integration of the network device and preventing situations where the protection path is not activated. Furthermore, the working path and protection path selected for a certain wavelength of service optical signal can be the same or different in different time periods, making protection switching highly flexible.

[0024] Fifthly, a network device is provided, comprising: a third wavelength selection switch, the third wavelength selection switch including a sixth common port and multiple seventh branch ports; the multiple seventh branch ports are respectively connected to multiple optical fibers, the multiple optical fibers including a first optical fiber and a second optical fiber; the third wavelength selection switch is used to output a first portion of the optical signal received through the first optical fiber from the sixth common port when the first optical fiber is normal; the third wavelength selection switch is also used to output a second portion of the optical signal received through the second optical fiber from the sixth common port when the first optical fiber is faulty. This network device can receive the first optical signal transmitted to the network device through the first or second optical fiber through the third wavelength selection switch, enabling the first and second optical fibers to form a protective relationship, avoiding the need for multiple optical switches in the network device to receive the optical signal transmitted to the network device through the first or second optical fiber, thus improving the integration of the network device. Furthermore, the third wavelength selection switch in this network device can receive both the first portion and the second portion of the first optical signal, therefore the network device can also detect whether the first optical fiber is normal based on the first portion of the first optical signal, and detect whether the second optical fiber is normal based on the second portion of the first optical signal.

[0025] In a sixth aspect, an optical network is provided, comprising: a first network device, a second network device, and a plurality of optical fibers connecting the first network device and the second network device, the plurality of optical fibers including the first optical fiber and the second optical fiber, the first network device including the network device as described in any of the fourth aspects above, and the second network device including the network device as described in any of the fifth aspects above.

[0026] The technical effects of any possible implementation of the sixth aspect can be seen in the technical effects of different implementations of the fourth or fifth aspects mentioned above, and will not be repeated here.

[0027] In a seventh aspect, a network device is provided, including a first optical splitter, a first wavelength selective switch, and a second wavelength selective switch. Two branch ports of the first optical splitter are respectively connected to a common port of the first wavelength selective switch and a common port of the second wavelength selective switch. The first wavelength selective switch further includes multiple first branch ports, each connected to multiple optical fibers. The second wavelength selective switch further includes multiple second branch ports, each connected to multiple optical fibers. The multiple optical fibers include first optical fibers and second optical fibers. The first optical splitter is used to receive a first transmitted optical signal through its common port, split the first transmitted optical signal into a first part of the transmitted optical signal and a second part of the transmitted optical signal, output the first part of the transmitted optical signal to the first wavelength selective switch, and output the second part of the transmitted optical signal to the second wavelength selective switch. The first wavelength selective switch is used to output a fourth optical signal from the first part of the transmitted optical signal to the first optical fiber. The second wavelength selective switch is used to output a fifth optical signal from the second part of the transmitted optical signal to the second optical fiber, wherein the wavelength of the fourth optical signal is the same as the wavelength of the fifth optical signal. In this network device, the first transmitted optical signal includes a first service optical signal and a second service optical signal. Therefore, the first part of the transmitted optical signal includes the first service optical signal and the second service optical signal, and the second part of the transmitted optical signal includes the first service optical signal and the second service optical signal. The wavelength of the fourth optical signal is the same as the wavelength of the fifth optical signal. For example, the fourth optical signal includes the first service optical signal and the second service optical signal, and the fifth optical signal includes the first service optical signal and the second service optical signal; or, the fourth optical signal includes the first service optical signal, and the fifth optical signal includes the first service optical signal; or, the fourth optical signal includes the second service optical signal, and the fifth optical signal includes the second service optical signal. In this network device, the first optical splitter enables the first wavelength selection switch and the second wavelength selection switch to receive the first part of the transmitted optical signal and the second part of the transmitted optical signal, respectively. The first wavelength selection switch transmits the fourth optical signal from the first portion of the transmitted optical signal to the first optical fiber; the second wavelength selection switch transmits the fifth optical signal from the second portion of the transmitted optical signal to the second optical fiber. The wavelengths of the fourth and fifth optical signals are the same. Therefore, the fourth and fifth optical signals can be any one of the service optical signals in the first transmitted optical signal. Thus, the network device can use the first optical splitter, the first wavelength selection switch, and the second wavelength selection switch to select the working path and protection path for any one of the service optical signals in the first transmitted optical signal, and transmit the service optical signal to the working path and protection path. This avoids the need for multiple optical splitters in the network device to select the working path and protection path for the service optical signal, improving the integration of the network device and preventing situations where the protection path is not activated. Furthermore, the working path and protection path selected for a certain wavelength of service optical signal can be the same or different at different times, making protection switching highly flexible.

[0028] Optionally, the multiple optical fibers also include a third optical fiber, a first wavelength selection switch for outputting the sixth optical signal from the first portion of the transmitted optical signal to the first optical fiber, and a second wavelength selection switch for outputting the seventh optical signal from the second portion of the transmitted optical signal to the third optical fiber. The wavelengths of the sixth and seventh optical signals are the same, but different from the wavelengths of the fourth optical signal. In this optional configuration, the seventh optical signal has a different wavelength from the fifth optical signal. Therefore, the network device can use the first wavelength selection switch to select the same working path and different protection paths for service optical signals with different wavelengths in the first transmitted optical signal, improving the flexibility of the network device.

[0029] Optionally, the multiple optical fibers also include a third optical fiber, a first wavelength selection switch for outputting the sixth optical signal from the first part of the transmitted optical signal to the third optical fiber, and a second wavelength selection switch for outputting the seventh optical signal from the second part of the transmitted optical signal to the second optical fiber. The wavelengths of the sixth and seventh optical signals are the same, but different from the wavelengths of the fourth optical signal. In this optional configuration, the seventh optical signal has a different wavelength from the fifth optical signal. Therefore, the network device can use the first wavelength selection switch to select different working paths and the same protection path for service optical signals with different wavelengths in the first transmitted optical signal, improving the flexibility of the network device. Optionally, the network device further includes a first optical device and a second optical device; the first optical device includes a first common port, a third branch port, and a fourth branch port, the first common port being connected to the third branch port, the first common port being connected to the fourth branch port, the third branch port being connected to one first branch port of a first wavelength selection switch, the fourth branch port being connected to one second branch port of a second wavelength selection switch, and the first common port being connected to a first optical fiber; the second optical device includes a second common port, a fifth branch port, and a sixth branch port, the second common port being connected to the fifth branch port, the second common port being connected to the sixth branch port, the fifth branch port being connected to another first branch port of the first wavelength selection switch, the sixth branch port being connected to another second branch port of the second wavelength selection switch, and the second common port being connected to a second optical fiber.

[0030] Optionally, the network device also includes a multiplexer; the multiplexer is connected to the common port of the first optical splitter; the multiplexer is used to output a first transmission optical signal to the first optical splitter.

[0031] Eighthly, a network device is provided, including a second optical splitter, a third wavelength selective switch, and a fourth wavelength selective switch. Two branch ports of the second optical splitter are respectively connected to the common port of the third wavelength selective switch and the common port of the fourth wavelength selective switch. The third wavelength selective switch further includes multiple seventh branch ports, each connected to multiple optical fibers. The fourth wavelength selective switch further includes multiple eighth branch ports, each connected to multiple optical fibers. The multiple optical fibers include a first optical fiber and a second optical fiber. The third wavelength selective switch is used to output a fourth optical signal received through the first optical fiber to the second optical splitter when the first optical fiber is functioning normally. The fourth wavelength selective switch is used to be turned off when the first optical fiber is functioning normally. The third wavelength selective switch is also used to be turned off when the first optical fiber is faulty, and the fourth wavelength selective switch is used to output a fifth optical signal received through the second optical fiber to the second optical splitter when the first optical fiber is faulty. The wavelength of the fourth optical signal is the same as the wavelength of the fifth optical signal. The second optical splitter is used to output either the received fourth or fifth optical signal. In this network device, when the first optical fiber is functioning normally, the first wavelength selective switch outputs the fourth optical signal received through the first optical fiber to the second optical splitter. The second wavelength selective switch is closed when the first optical fiber is functioning normally. When the first optical fiber fails, the first wavelength selective switch is closed, and the second wavelength selective switch outputs the fifth optical signal received through the second optical fiber to the second optical splitter. The wavelengths of the fourth and fifth optical signals are the same. Therefore, this network device can receive optical signals of the same wavelength transmitted through either the first or second optical fiber using the first and second wavelength selective switches. This establishes a protective relationship between the first and second optical fibers, avoiding the need for multiple optical switches to receive the optical signals transmitted through either the first or second optical fiber, thus improving the integration of the network device. Furthermore, since this network device can receive both the fourth and fifth optical signals, it can also detect the function of the first optical fiber based on the fourth optical signal and the second optical fiber based on the fifth optical signal.

[0032] Optionally, the multiple optical fibers also include a third optical fiber and a third wavelength selection switch, used to output the sixth optical signal received through the first optical fiber to the second optical splitter when the first optical fiber is normal; a fourth wavelength selection switch is used to output the seventh optical signal received through the third optical fiber to the second optical splitter when the first optical fiber fails, wherein the wavelength of the sixth optical signal is the same as the wavelength of the seventh optical signal, and the wavelength of the sixth optical signal is different from the wavelength of the fourth optical signal.

[0033] Optionally, the multiple optical fibers also include a third optical fiber and a third wavelength selection switch, used to output the sixth optical signal received through the third optical fiber to the second optical splitter when the third optical fiber is normal; a fourth wavelength selection switch is used to output the seventh optical signal received through the second optical fiber to the second optical splitter when the first optical fiber fails, wherein the wavelength of the sixth optical signal is the same as the wavelength of the seventh optical signal, and the wavelength of the sixth optical signal is different from the wavelength of the fourth optical signal.

[0034] Optionally, the network equipment also includes a third optical device and a fourth optical device; the third optical device includes a third common port, a ninth branch port, and a tenth branch port, the third common port being connected to the ninth branch port, the third common port being connected to the tenth branch port, the ninth branch port being connected to a seventh branch port of the third wavelength selection switch, the tenth branch port being connected to an eighth branch port of the fourth wavelength selection switch, and the third common port being connected to the first optical fiber; the fourth optical device includes a fourth common port, an eleventh branch port, and a twelfth branch port, the fourth common port being connected to the eleventh branch port, the fourth common port being connected to the twelfth branch port, the eleventh branch port being connected to another seventh branch port of the third wavelength selection switch, the twelfth branch port being connected to another eighth branch port of the fourth wavelength selection switch, and the fourth common port being connected to the second optical fiber.

[0035] Optionally, the network device also includes a wavelength division multiplexer (WDM); the WDM is connected to the common port of the second optical splitter; the WDM is used to transmit optical signals of different wavelengths in the received optical signal to different locations.

[0036] A ninth aspect provides an optical network, comprising: a first network device, a second network device, and a plurality of optical fibers connecting the first network device and the second network device, the plurality of optical fibers including the first optical fiber and the second optical fiber, the first network device including the network device as described in any of the seventh aspects above, and the second network device including the network device as described in any of the eighth aspects above.

[0037] The technical effects of any possible implementation of aspect nine can be found in the technical effects of different implementations of aspects seven or eight above, and will not be repeated here. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the optical network structure provided in this application;

[0039] Figure 2 Another schematic diagram of the optical network provided in this application;

[0040] Figure 3 A schematic diagram of the structure of an optical network provided for an embodiment of this application;

[0041] Figure 4 A schematic diagram of the structure of an optical network provided in another embodiment of this application;

[0042] Figure 5 A schematic diagram of the structure of an optical network provided in another embodiment of this application;

[0043] Figure 6 A schematic diagram of the structure of an optical network provided in another embodiment of this application;

[0044] Figure 7 A schematic diagram of the structure of an optical network provided in another embodiment of this application;

[0045] Figure 8 A schematic diagram of the structure of an optical network provided in another embodiment of this application;

[0046] Figure 9 A schematic diagram of the structure of an optical network provided in another embodiment of this application;

[0047] Figure 10 A schematic diagram of the structure of an optical network provided in another embodiment of this application;

[0048] Figure 11 This is a schematic diagram of the structure of an optical network provided in another embodiment of this application. Detailed Implementation

[0049] The technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0050] Unless otherwise defined, all technical terms used herein have the same meaning as those known to one of ordinary skill in the art. In the embodiments of this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, in the embodiments of this application, the words "first," "second," etc., do not limit the quantity or order.

[0051] Furthermore, in the embodiments of this application, directional terms such as "upper" and "lower" are defined relative to the orientation in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation in which the components are placed in the accompanying drawings.

[0052] In the embodiments of this application, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0053] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0054] Currently, optical networks consist of multiple network devices connected by optical fibers. The connection between these network devices can be point-to-point or multi-point-to-multi-point (or mesh) interconnection.

[0055] Reference Figure 1 As shown in the illustration, embodiments of this application provide a schematic diagram of the structure of an optical network 100. The optical network 100 includes multiple network devices connected via optical fibers, including network device 10 and network device 20. In some embodiments, the multiple network devices further include network device B and network device D disposed between network device 10 and network device 20; it also includes network device A connected to network device 10, network device C connected to network device 10, and network device A is also connected to network device 20, and network device C is also connected to network device D. The network devices connected via optical fibers can transmit optical signals to achieve communication.

[0056] Specifically, refer to Figure 2 As shown, Figure 2 A schematic diagram of the connection structure between network device 10 and network device 20 is shown, and Figure 2 Taking network device 10 outputting optical signals and network device 20 receiving optical signals as an example, the signal transmission of optical network 100 is described. Network device 10 is connected to optical transceiver (OT / OTU) 30a, which outputs optical signals to network device 10. Network device 20 is connected to optical transceiver 40a, which receives the optical signals output by network device 20.

[0057] Reference Figure 2As shown, in order to achieve wavelength-level protection switching, network device 10 includes an optical splitter 11a, and network device 20 includes an optical switch 21a. The input end of the optical splitter 11a is connected to the optical transceiver 30a. The first output end of the optical splitter 11a is connected to the first input end of the optical switch 21a through optical fiber F1. The second output end of the optical splitter 11a is connected to the second input end of the optical switch 21a through optical fiber F1. The output end of the optical switch 21a is connected to the optical transceiver 40a.

[0058] exist Figure 2 In the network device 10 shown, the optical splitter 11a receives the service optical signal o1 output by the optical transceiver 30a, and splits the service optical signal o1 into a first part optical signal o1a and a second part optical signal o1b in a 50:50 ratio. The first part optical signal o1a is output through the first output terminal of the optical splitter 11a, and the second part optical signal o1b is output through the second output terminal of the optical splitter 11a. The first part optical signal o1a can be transmitted to the network device 20 through optical fiber F1, and the second part optical signal o1b can be transmitted to the network device 20 through optical fiber F2.

[0059] exist Figure 2 In the network device 20 shown, optical switch 21a is used to connect the first input terminal and the output terminal of optical switch 21a to transmit the first part of optical signal o1a to optical transceiver 40a; or, optical switch 21a is used to connect the second input terminal and the output terminal of optical switch 21a to transmit the second part of optical signal o1b to optical transceiver 40a.

[0060] The network device 20 is equipped with a controller. The controller determines that the optical fiber F1 is normal based on the optical power of the first part of the optical signal o1a being greater than or equal to the optical power of the second part of the optical signal o1b, and then controls the first input terminal and the output terminal of the optical switch 21a to be connected. The controller determines that the optical fiber F1 is faulty and the optical fiber F2 is normal based on the optical power of the first part of the optical signal o1a being less than the optical power of the second part of the optical signal o1b, and then controls the second input terminal and the output terminal of the optical switch 21a to be connected.

[0061] It is evident that optical fibers F1 and F2 form a protective relationship. However, the optical splitter 11a and the optical switch 21a are fixedly connected via optical fibers F1 and F2, therefore, only optical fibers F1 and F2 can form a protective relationship, and this protective relationship cannot be changed.

[0062] Additionally, refer to Figure 2 As shown, network device 10 can connect to multiple optical transceivers, each outputting an optical signal with a different wavelength; network device 20 can also connect to multiple optical transceivers, each receiving an optical signal with a different wavelength. For example, in Figure 2In this configuration, network device 10 is also connected to optical transceiver 30b, where the wavelengths of the optical signals output by optical transceiver 30a and optical transceiver 30b are different. Similarly, network device 20 is also connected to optical transceiver 40b, where the wavelengths of the optical signals received by optical transceiver 40a and optical transceiver 40b are different. Furthermore, the wavelength of the optical signal output by optical transceiver 30a is the same as the wavelength of the optical signal received by optical transceiver 40a, and the wavelength of the optical signal output by optical transceiver 30b is the same as the wavelength of the optical signal received by optical transceiver 40b.

[0063] In this case, in order to achieve wavelength-level protection switching, such as Figure 2 As shown, network device 10 also includes an optical splitter 11b, a multiplexer 12a, and a multiplexer 12b. The first output of optical splitter 11a is connected to one branch port of multiplexer 12a, the common port of multiplexer 12a is connected to fiber F1, the second output of optical splitter 11a is connected to one branch port of multiplexer 12b, and the common port of multiplexer 12b is connected to fiber F2. The input of optical splitter 11b is connected to optical transceiver 30b, the first output of optical splitter 11b is connected to another branch port of multiplexer 12a, and the second output of optical splitter 11b is connected to another branch port of multiplexer 12b. The optical signal received at any branch port of the multiplexer can be output through the common port of the multiplexer, and the wavelengths of the optical signals received at the multiplexer's multiple branch ports are different; the common port of the multiplexer outputs a multiplexed optical signal.

[0064] Network device 20 also includes an optical switch 21b, a wavelength division multiplexer (WDM) 22a, and another WDM 22b. The first input of optical switch 21a is connected to one branch port of WDM 22a, and the common port of WDM 22a is connected to fiber optic cable F1. The second input of optical switch 21a is connected to one branch port of WDM 22b, and the common port of WDM 22b is connected to fiber optic cable F2. The output of optical switch 21b is connected to optical transceiver 40b, and the first input of optical switch 21b is connected to another branch port of WDM 22a, and the second input of optical switch 21b is connected to another branch port of WDM 22b. The optical signal received at the common port of the WDM can be output through any one of the branch ports of the WDM, and the common port of the WDM receives a multiplexed optical signal. The wavelengths of the optical signals output from the multiple branch ports of the WDM are different.

[0065] Optical splitter 11b is used to receive the service optical signal o2 output by optical transceiver 30b, and divide the service optical signal o2 into a first part optical signal o2a and a second part optical signal o2b in a 50:50 ratio. The first part optical signal o2a is output through the first output terminal of optical splitter 11b, and the second part optical signal o2b is output through the second output terminal of optical splitter 11b.

[0066] Multiplexer 12a is used to combine the first optical signal o1a and the first optical signal o2a into a first combined optical signal for output. Multiplexer 12b is used to combine the second optical signal o1b and the second optical signal o2b into a second combined optical signal for output. The first combined optical signal can be transmitted to network device 20 through optical fiber F1, and the second combined optical signal can be transmitted to network device 20 through optical fiber F2.

[0067] Demultiplexer 22a is used to transmit the first portion of the first combined optical signal, optical signal o1a, to the first input terminal of optical switch 21a, and to transmit the first portion of the first combined optical signal, optical signal o2a, to the first input terminal of optical switch 21b. Demultiplexer 22b is used to transmit the second portion of the second combined optical signal, optical signal o1b, to the second input terminal of optical switch 21a, and to transmit the second portion of the second combined optical signal, optical signal o2b, to the second input terminal of optical switch 21b.

[0068] Optical switch 21b is used to connect the first input terminal and the output terminal of optical switch 21b to transmit the first part of the optical signal o2a to optical transceiver 40b; or, optical switch 21b is used to connect the second input terminal and the output terminal of optical switch 21b to transmit the second part of the optical signal o2b to optical transceiver 40b.

[0069] For example, the controller in network device 20 controls the first input terminal and output terminal of optical switch 21a to be connected and the first input terminal and output terminal of optical switch 21b to be connected based on the optical power of the first part of optical signal o1a being greater than or equal to the optical power of the second part of optical signal o1b; the controller controls the second input terminal and output terminal of optical switch 21a to be connected and the second input terminal and output terminal of optical switch 21b to be connected based on the optical power of the first part of optical signal o1a being less than the optical power of the second part of optical signal o1b.

[0070] like Figure 2 As shown, network device 10 is also connected to network device A via optical fiber, and network device 10 is also connected to network device C via optical fiber. The optical signal output by network device 10 can be transmitted to network device A, network device C, network device B, and network device D, and then to network device 20. Network device A, network device C, and network device B have different line directions, therefore, referring to... Figure 2 As shown, the network device 10 also needs to be equipped with devices for scheduling different line directions. For example, the network device 10 also includes a demultiplexer 14a and a multiplexer 15a, a demultiplexer 14b and a multiplexer 15b. The demultiplexer 14a and the demultiplexer 14b are used to transmit optical signals of different wavelengths to the corresponding line directions. The multiplexer 15a is used to combine the optical signals that need to be transmitted through optical fiber F1 and output them to optical fiber F1. The multiplexer 15b is used to combine the optical signals that need to be transmitted through optical fiber F2 and output them to optical fiber F2.

[0071] Figure 2 The network device 20 shown is also connected to an optical transceiver or other network devices. Therefore, the network device 20 also needs to be equipped with devices for scheduling different line directions. For example, the network device 20 also includes a multiplexer 23a and a demultiplexer 24a, a multiplexer 23b and a demultiplexer 24b. The demultiplexer 24a is used to transmit optical signals of different wavelengths in the optical signal input through optical fiber F1 to the corresponding line direction. The demultiplexer 24b is used to transmit optical signals of different wavelengths in the optical signal input through optical fiber F2 to the corresponding line direction. The multiplexer 23a is used to combine all the optical signals transmitted to the direction of optical transceiver 40a and optical transceiver 40b and then transmit them to the demultiplexer 22a. The multiplexer 23b is used to combine all the optical signals transmitted to the direction of optical transceiver 40a and optical transceiver 40b and then transmit them to the demultiplexer 22b.

[0072] For example, Figure 2 The network device 10 shown can also be equipped with an optical amplifier to amplify the optical signal. For example, an optical amplifier 13a is provided between the multiplexer 12a and the demultiplexer 14a, and an optical amplifier 13b is provided between the multiplexer 12b and the demultiplexer 14b. The multiplexer 15a is connected to the optical fiber F1 through the optical amplifier 16a, and the multiplexer 15b is connected to the optical fiber F2 through the optical amplifier 16b.

[0073] Figure 2 The network device 20 shown can also be equipped with an optical amplifier to amplify the optical signal. For example, the demultiplexer 24a is connected to the optical fiber F1 through the optical amplifier 25a, the demultiplexer 24b is connected to the optical fiber F2 through the optical amplifier 25b, the multiplexer 23a and the demultiplexer 22a are provided with an optical amplifier 26a, and the multiplexer 23b and the demultiplexer 22b are provided with an optical amplifier 26b.

[0074] However, existing multiplexers and demultiplexers also have fixed connections and fixed routes, therefore Figure 2 The protection relationship between optical fibers F1 and F2 shown remains unchanged.

[0075] In some optical networks, wavelength selective switches (WSS) replace multiplexers and demultiplexers in all network devices. Such networks are also known as wavelength-switched optical networks (WSON). Rerouting and protection switching can be achieved by reconfiguring the WSS in network devices, and the WSS allows for flexible configuration of protection relationships within the network. However, for existing networks, large-scale replacement of multiplexers and demultiplexers with wavelength selective switches is not feasible.

[0076] Some network devices achieve flexible configuration of protection relationships by setting up a multi-cast switch (MCS), but the multi-cast switch relies on an add and drop wavelength selective switch (ADWSS), which has a high configuration cost.

[0077] Therefore, embodiments of this application provide a network device that can select a working path and a protection path for optical signals of any wavelength.

[0078] Specifically, such as Figure 3 As shown in the figure, an embodiment of this application provides a schematic diagram of the structure of an optical network 200, which includes multiple network devices connected by optical fibers. Figure 3 The network devices shown include network device 50 and network device 60.

[0079] Reference Figure 3 As shown, network device 50 includes a wavelength selection switch 51a and a light source 54a. Wavelength selection switch 51a includes a common port a11, a common port a12, and multiple first branch ports. Wavelength selection switch 51a is also referred to as a first wavelength selection switch, common port a11 is also referred to as a first common port, common port a12 is also referred to as a second common port, branch port b11 is also referred to as a first branch port, and branch port b12 is also referred to as a second branch port.

[0080] The common port a12 of the wavelength selection switch 51a is connected to the light source 54a.

[0081] The wavelength selective switch 51a has multiple first branch ports that are respectively connected to multiple optical fibers, including optical fiber F3 and optical fiber F4. Optical fiber F3 is also referred to as the first optical fiber, and optical fiber F4 is also referred to as the second optical fiber. For example, in Figure 3 In the network device 50 shown, the wavelength selection switch 51a has multiple first branch ports including branch port b11 and branch port b12. Branch port b11 of the wavelength selection switch 51a is connected to optical fiber F3, and branch port b12 of the wavelength selection switch 51a is connected to optical fiber F4. Both optical fiber F3 and optical fiber F4 are connected to the network device 60.

[0082] Light source 54a is used to output detection light signal oS1 to wavelength selective switch 51a.

[0083] A wavelength selection switch 51a is used to receive a first transmitted optical signal OH1 through a common port a11 and a detection optical signal OS1 through a common port a12. For example, the first transmitted optical signal OH1 is typically a multiplexed optical signal, which includes multiple service optical signals with different wavelengths. Generally, the wavelength range of the first transmitted optical signal belongs to the in-band of the service optical signals. The wavelength of the detection optical signal OS1 can also belong to the in-band of the service optical signals, but the wavelength of the detection optical signal OS1 is different from the wavelength of any of the service optical signals in the first transmitted optical signal OH1. Alternatively, the wavelength of the detection optical signal OS1 may belong to the out-of-band. In the case where the wavelength of the detection optical signal OS1 belongs to the out-of-band, wavelength conflict between the detection optical signal OS1 and the first transmitted optical signal OH1 can be avoided.

[0084] In one embodiment, Figure 3 The network device 50 shown is connected to an optical transceiver. The network device 50 also includes a multiplexer 52a. The common port a11 of the wavelength selection switch 51a is connected to the common port c11 of the multiplexer 52a. The multiplexer 52a is a tributary-side multiplexer, and its multiple branch ports are respectively connected to multiple optical transceivers. Figure 3 The multiple optical transceivers connected to the multiplexer 52a shown include optical transceiver 30a and optical transceiver 30b. The multiple branch ports of the multiplexer 52a include branch port d11 and branch port d12. Optical transceiver 30a is connected to branch port d11 of the multiplexer 52a, and optical transceiver 30b is connected to branch port d12 of the multiplexer 52a.

[0085] The multiplexer 52a is used to combine optical signals output from multiple optical transceivers, and the combined optical signal output to the wavelength selection switch 51a is the first transmission optical signal OH1. For example, as shown... Figure 3 The network device 50 shown has an optical transceiver 30a that outputs a service optical signal o11 with wavelength λ1 and an optical transceiver 30 that outputs a service optical signal o12 with wavelength λ2. λ1 and λ2 are different. A multiplexer 52a is used to combine the service optical signals o11 and o12, and output a first transmission optical signal oH1 to the common port a11 of the wavelength selection switch 51a. The first transmission optical signal oH1 includes the service optical signal o11 and the service optical signal o12.

[0086] In other embodiments, network device 50 is a network device in the middle of a link, network device 50 does not include a multiplexer, and network device 50 receives a first transmitted optical signal OH1 output by a network device connected to an optical transceiver.

[0087] The following explanation will take the first transmitted optical signal OH1, which includes service optical signal OH11 and service optical signal OH12, as an example.

[0088] Wavelength selective switch 51a is used to output the first optical signal from the first transmitted optical signal OH1 to fiber 3 when fiber 3 is functioning normally, wherein the first transmitted optical signal OH1 includes the first optical signal, and to output a detection optical signal oS1 to fiber 4. Wavelength selective switch 51a is also used to output the first optical signal from the first transmitted optical signal OH1 to fiber 4 and to output the detection optical signal oS1 to fiber 3 when fiber 3 is faulty.

[0089] For example, the first optical signal in the first transmitted optical signal OH1 includes service optical signal OH11 and / or service optical signal OH12. Since the wavelength selection switch 51a outputs the first optical signal in the first transmitted optical signal OH1 to fiber F3 when fiber F3 is normal, and outputs the first optical signal in the first transmitted optical signal OH1 to fiber F4 when fiber F3 is faulty, it can be seen that the working path of the first optical signal is fiber F3, and the protection path of the first optical signal is fiber F4, with fiber F3 and fiber F4 forming a protection relationship. The first optical signal can be any service optical signal in the first transmitted optical signal. The wavelength selection switch 51a is connected to multiple optical fibers, including fiber F3 and fiber F4. Therefore, the network device 50 can use the wavelength selection switch 51a to select the working path and protection path for any service optical signal in the first transmitted optical signal, avoiding the need for multiple splitters in the network device 50 to select the working path and protection path for the service optical signal, thus improving the integration of the network device 50. Among them, the working path and protection path selected by the network device 50 for a certain wavelength of service optical signal in different time periods can be the same or different, which makes the protection switching highly flexible.

[0090] In addition, when fiber optic cable F3 is functioning normally, it transmits the first optical signal, and the wavelength selection switch 51a outputs a detection optical signal oS1 to fiber optic cable F4, illuminating fiber optic cable F4. This facilitates the detection of whether fiber optic cable F4 is functioning normally, improving the success rate of protection switching. In the event of a fault in fiber optic cable F3, fiber optic cable F4 transmits the first optical signal, and the wavelength selection switch 51a outputs a detection optical signal oS1 to fiber optic cable F3, enabling timely detection of fiber optic cable F3's recovery to normal operation.

[0091] Reference Figure 3 As shown, network device 60 includes a wavelength selection switch 61a and a detection device 64a. Wavelength selection switch 61a is also referred to as the first wavelength selection switch. Wavelength selection switch 61a includes a common port a21, a common port a22, and multiple seventh branch ports. Among them, wavelength selection switch 61a is also referred to as the third wavelength selection switch, common port a21 is also referred to as the sixth common port, and common port a22 is also referred to as the seventh common port.

[0092] The common port a22 of the wavelength selection switch 61a is connected to the detection device 64a.

[0093] The wavelength selective switch 61a has multiple seventh branch ports connected to multiple optical fibers, including fiber F3 and fiber F4. For example, Figure 3 The wavelength selection switch 61a shown has multiple seventh branch ports, including branch port b21 and branch port b22. Branch port b21 of wavelength selection switch 61a is connected to fiber optic F3, and branch port b22 of wavelength selection switch 61a is connected to fiber optic F4. Both fiber optic F3 and fiber optic F4 are connected to network device 50. Fiber optic F3 is also referred to as the first fiber optic cable, and fiber optic F4 is also referred to as the second fiber optic cable.

[0094] Wavelength selection switch 61a is used to output the first optical signal received through optical fiber F3 from common port a21 and transmit the detection optical signal oS1 received through optical fiber F4 to detection device 54a when optical fiber F3 is functioning normally; the wavelength of the detection optical signal oS1 is different from the wavelength of the first optical signal. Wavelength selection switch 61a is also used to output the first optical signal received through optical fiber F4 from common port a21 and transmit the detection optical signal oS1 received through optical fiber F3 to detection device 54a when optical fiber F3 is faulty.

[0095] The detection device 64a is used to determine whether the optical fiber transmitting the detection optical signal oS1 is faulty based on the received detection optical signal oS1. For example, when optical fiber F3 is normal, the detection device 64a receives the detection optical signal oS1 transmitted through optical fiber F4. The detection device 64a determines that the optical fiber is faulty based on the optical power of the detection optical signal oS1 being less than a first target optical power, and outputs first detection information indicating that optical fiber F4 is faulty. Alternatively, if the optical power of the detection optical signal oS1 is greater than or equal to a second target optical power, the detection device 64a outputs second detection information indicating that optical fiber F4 is normal. Conversely, if optical fiber F3 is faulty, the detection device 64a receives the detection optical signal oS1 transmitted through optical fiber F3. The detection device 64a determines that optical fiber F3 is faulty based on the optical power of the detection optical signal oS1 being less than the first target optical power, and outputs first detection information indicating that optical fiber F3 is faulty. Alternatively, if the optical power of the detection optical signal oS1 is greater than or equal to the second target optical power, the detection device 64a outputs second detection information indicating that optical fiber F3 is normal.

[0096] When fiber F3 is functioning normally, wavelength selective switch 61a outputs the first optical signal received through fiber F3 from common port a21; when fiber F3 fails, it outputs the first optical signal received through fiber F4 from common port a21. Therefore, the working path of the first optical signal is fiber F3, and the protection path is fiber F4, forming a protection relationship between fibers F3 and F4. Wavelength selective switch 61a can be connected to multiple optical fibers, including fibers F3 and F4. The network device 60 can receive the first optical signal transmitted through fiber F3 or fiber F4 via wavelength selective switch 61a, avoiding the need for multiple optical switches in the network device 60 to receive the optical signal transmitted through fiber F3 or F4, thus improving the integration of the network device 60.

[0097] Furthermore, when fiber F3 is functioning normally, it transmits the first optical signal. The wavelength selection switch 61a transmits the detection optical signal oS1 received through branch port b22 to the detection device 54a, allowing the detection device 54a to determine whether fiber F4 is functioning normally based on the detection optical signal oS1, thus improving the success rate of protection switching. In the event of a fault in fiber F3, the wavelength selection switch 61a transmits the detection optical signal oS1 received through branch port b21 to the detection device 54a, enabling the detection device 54a to promptly detect when fiber F3 has returned to normal.

[0098] In one embodiment, Figure 3 The network device 60 shown is connected to an optical transceiver. The network device 60 also includes a wavelength division multiplexer (WDM) 62a. The common port a21 of the wavelength selection switch 61a is connected to the common port e11 of the WDM 62a. The WDM 62a is a tributary-side WDM, and its multiple branch ports are respectively connected to multiple optical transceivers. Figure 3 The multiple optical transceivers connected to the demultiplexer 62a shown include optical transceiver 40a and optical transceiver 40b. The multiple branch ports of the demultiplexer 62a include branch port f11 and branch port f12. Optical transceiver 40a is connected to branch port f11 of the demultiplexer 62a, and optical transceiver 40b is connected to branch port f12 of the demultiplexer 62a.

[0099] The wavelength division multiplexer 62a is used to output optical signals of different wavelengths from the first optical signal. Specifically, as shown... Figure 3The network device 60 shown has an optical transceiver 40a receiving an optical signal with wavelength λ1, and an optical transceiver 40b receiving an optical signal with wavelength λ2. The branch port f11 of the demultiplexer 62a connected to the optical transceiver 40a transmits an optical signal with wavelength λ1, and the branch port f12 of the demultiplexer 62a connected to the optical transceiver 40a transmits an optical signal with wavelength λ2. When the first optical signal includes a service optical signal o11, the demultiplexer 62a transmits the service optical signal o11 to the corresponding optical transceiver 40a; when the first optical signal includes a service optical signal o12, the demultiplexer 62a transmits the service optical signal o12 to the corresponding optical transceiver 40b.

[0100] In other embodiments, network device 60 is an intermediate network device in a link, network device 60 does not include a multiplexer, and network device 60 transmits the first optical signal to a network device connected to an optical transceiver.

[0101] For example, Figure 3 The fiber optic cables F3 and F4 shown are located in different fiber optic slots, which are also called fiber optic trenches.

[0102] For example, such as Figure 3 As shown, Figure 3 The network device 50 shown also includes a controller 53. The controller 53 is used to output a first control signal s1 to the wavelength selection switch 51a when the fiber optic F3 is normal. The first control signal s1 is used to indicate that the first optical signal includes service optical signal o11 and / or service optical signal o12 and that the output port of the first optical signal is a branch port b11. The first control signal s1 is also used to indicate that the output port of the detection optical signal oS1 is a branch port b12. The wavelength selection switch 51a is specifically used to output the first optical signal in the first transmission optical signal oh1 to the fiber optic F3 according to the first control signal s1. The first transmission optical signal oh1 includes the first optical signal. The first detection optical signal oS1 is also output to the fiber optic F4. The controller 53 is also used to output a second control signal s2 to the wavelength selection switch 51a according to the fault of the fiber optic F3. The second control signal s2 is used to indicate that the first optical signal includes the service optical signal o11 and / or the service optical signal o12 and that the output port of the first optical signal is the branch port b12. The second control signal s2 is also used to indicate that the output port of the detection optical signal oS1 is the branch port b11. The wavelength selection switch 51a is specifically used to output the first optical signal in the first transmission optical signal oh1 to the fiber optic F4 according to the second control signal s2. The first transmission optical signal oh1 includes the first optical signal. The first optical signal oh1 outputs the detection optical signal oS1 to the fiber optic F3.

[0103] Figure 3The network device 60 shown also includes a controller 63. The controller 63 is used to output a third control signal s3 to the wavelength selection switch 61a when the fiber optic F3 is normal. The third control signal s3 is used to indicate that the input port of the first optical signal is the branch port b21 and the input port of the detection optical signal oS1 is the branch port b22. The wavelength selection switch 61a is specifically used to output the first optical signal received through the fiber optic F3 from the common port a21 according to the third control signal s3, and to transmit the detection optical signal oS1 received through the fiber optic F4 to the detection device 54a. The controller 53 is also used to output a fourth control signal s4 to the wavelength selection switch 51a according to the failure of the optical fiber F3. The fourth control signal s4 is used to indicate that the input port of the first optical signal is the branch port b22. The fourth control signal s4 is also used to indicate that the input port of the detection optical signal oS1 is the branch port b21. The wavelength selection switch 51a is specifically used to output the first optical signal received through the optical fiber F4 from the common port a21 according to the fourth control signal s4, and to transmit the detection optical signal oS1 received through the optical fiber F3 to the detection device 54a.

[0104] For example, controllers 53 and 63 initially assume that fiber optic cable F3 is normal. When the first optical signal is transmitted through fiber optic cable F3, controller 63 receives fault information reported by optical transceiver 40a or 40b, and determines that fiber optic cable F3 is faulty based on the third control signal S3 and the fault information reported by optical transceiver 40a or 40b. Additionally, controller 63 is also used to generate alarm information based on the fault information, which is used to indicate to maintenance personnel that fiber optic cable F3 is faulty.

[0105] In other embodiments, such as Figure 3 As shown, network device 60 includes an optical monitoring device 66, such as an optical performance monitor, located between the common port a21 of wavelength selective switch 61a and the common port e11 of demultiplexer 62a. The optical monitoring device 66 can determine whether the optical fiber transmitting the optical signal is normal based on the optical signal transmitted from wavelength selective switch 61a to demultiplexer 62a, and output monitoring information. Specifically, when the first optical signal is transmitted through optical fiber F3, wavelength selective switch 61a outputs the first optical signal received through optical fiber F3 to demultiplexer 62a. The optical monitoring device 66 determines whether optical fiber F3 is faulty based on the first optical signal. For example, if the optical power of the first optical signal is less than the second target optical power, the optical monitoring device 66 determines that optical fiber F3 is faulty and outputs monitoring information carrying information about the fault in optical fiber F3. Controller 63 receives the monitoring information and determines that optical fiber F3 is faulty based on the monitoring information. If the optical monitoring device 66 determines that optical fiber F3 is normal based on the optical power of the first optical signal being greater than or equal to the second target optical power, it will not output monitoring information in this case.

[0106] For example, controller 63 is also configured to generate alarm information based on monitoring information, the alarm information being used to indicate to maintenance personnel that fiber optic F3 is faulty.

[0107] Normally, the controller 63 assumes that fiber optic F3 is normal, and determines that fiber optic F3 is faulty upon receiving monitoring information or fault information.

[0108] After controller 63 determines that fiber optic cable F3 is faulty, in one example, controller 63 outputs a monitoring optical signal to network device 50 via the optical supervisory channel (OSC), carrying information about the fiber optic cable F3 fault. Controller 53 in network device 50 determines the fiber optic cable F3 fault based on the monitoring optical signal. In another example, controller 63 reports fiber optic cable fault information to the upper-layer network management system, carrying information about the fiber optic cable F3 fault. The upper-layer network management system then issues a fiber optic cable fault command to network device 50, carrying information about the fiber optic cable F3 fault. Controller 53 in network device 50 determines the fiber optic cable F3 fault based on the fiber optic cable fault command.

[0109] For example, in network device 60, detection device 64a is connected to controller 63. Controller 63 determines that fiber optic cable F4 is normal based on the third control signal S3 and the first detection confirmation information reported by detection device 64a, and determines that fiber optic cable F4 is faulty based on the third control signal S3 and the second detection information reported by detection device 64a. When controller 63 outputs the third control signal S3 to wavelength selective switch 61a and receives the second detection information reported by detection device 64a, controller 63 is also used to receive alarm information generated based on the detection information. The alarm information is used to indicate to maintenance personnel that fiber optic cable F4 is faulty. For example, when controller 63 outputs the fourth control signal S4 to wavelength selective switch 61a and receives the first detection information reported by detection device 64a, it indicates that fiber optic cable F3 has been repaired. Controller 63 transmits recovery information to network device 50 and outputs the third control signal S3 to wavelength selective switch 61a, so that controller 53 in network device 50 outputs the first control signal to wavelength selective switch 53a, thereby achieving a switchover recovery.

[0110] For example, such as Figure 3 As shown, network device 50 also includes an optical amplifier, which amplifies the received optical signal, for example in... Figure 3 In the network device 50, there are optical amplifiers 55a located between the common port c11 of the multiplexer 52a and the common port a11 of the wavelength selection switch 51a, optical amplifiers 55b located between the branch port b11 of the wavelength selection switch 51a and the optical fiber F3, and optical amplifiers 55c located between the branch port b12 of the wavelength selection switch 51a and the optical fiber F4.

[0111] For example, such as Figure 3 As shown, network device 60 also includes an optical amplifier, which amplifies the received optical signal, for example in... Figure 3 In the network device 60, there are optical amplifiers 65a located between the common port a21 of the wavelength selection switch 61a and the common port e11 of the demultiplexer 62a, optical amplifiers 65b located between the optical fiber F3 and the branch port b21 of the wavelength selection switch 61a, and optical amplifiers 65c located between the optical fiber F4 and the branch port b22 of the wavelength selection switch 61a.

[0112] For example, refer to Figure 4 As shown, compared to Figure 3 The network device 50 shown is... Figure 4 In the network device 50 shown, the multiple first branch ports of the wavelength selective switch 51a also include a branch port b13. Multiple optical fibers also include optical fiber F5, and the branch port b13 of the wavelength selective switch 51a is connected to optical fiber F5. Optical fiber F5 is also referred to as the third optical fiber.

[0113] Figure 4 In the network device 60 shown, the multiple seventh branch ports of the wavelength selective switch 61a also include branch port b23. Multiple optical fibers also include optical fiber F5, and the branch port b23 of the wavelength selective switch 61a is connected to optical fiber F5.

[0114] In the first embodiment, reference is made to... Figure 4 As shown, in Figure 3 Based on the optical network 200 shown, Figure 4 The wavelength selection switch 51a in the network device 50 shown is used to output the second optical signal from the first transmitted optical signal OH1 to the fiber optic cable F3 when the fiber optic cable F3 is functioning normally. The first transmitted optical signal OH1 includes the second optical signal, and the wavelengths of the first and second optical signals are different. For example, the first optical signal is the service optical signal OH11, and the second optical signal is the service optical signal OH12. The wavelength selection switch 61a in the network device 60 is used to output the second optical signal received through the fiber optic cable F3 from the common port a21 when the fiber optic cable F3 is functioning normally.

[0115] Wavelength selection switch 51a is also used to output a second optical signal to fiber F4 in the event of a failure in fiber F3. In network device 60, wavelength selection switch 61a is used to output the first optical signal received through fiber F4 from common port a21 in the event of a failure in fiber F3. In this case, the working path of the service optical signal o11 with wavelength λ1 is fiber F3, the protection path of the service optical signal o11 with wavelength λ1 is fiber F4, the working path of the service optical signal o12 with wavelength λ2 is fiber F3, and the protection path of the service optical signal o12 with wavelength λ2 is fiber F4.

[0116] Furthermore, the first transmitted optical signal OH1 also includes other optical signals, and the wavelengths of the first optical signal, the second optical signal, and the other optical signals are all different. The wavelength selection switch 51a is used to output other optical signals to the optical fiber F5. And these other optical signals do not require a protection path.

[0117] In the second embodiment, refer to Figure 4 As shown, Figure 4 In the network device 50 shown, wavelength selection switch 51a is used to output a second optical signal from a first transmitted optical signal OH1 to fiber optic F5 when fiber optic F5 is functioning normally. The first transmitted optical signal OH1 includes the second optical signal, and the wavelengths of the first and second optical signals are different. For example, the first optical signal is service optical signal OH11, and the second optical signal is service optical signal OH12. Wavelength selection switch 61a in network device 60 is used to output the second optical signal received through fiber optic F5 from common port a21 when fiber optic F5 is functioning normally.

[0118] The wavelength selection switch 51a is also used to output a second optical signal to fiber F4 and a detection optical signal oS1 to fiber F5 in the event of a failure of fiber F5. In the network device 60, the wavelength selection switch 61a is used to output the second optical signal received through fiber F4 from the common port a21 and transmit the detection optical signal oS1 received through fiber F5 to the detection device 64a in the event of a failure of fiber F5.

[0119] In this case, the working path of the service optical signal o11 with wavelength λ1 is fiber F3, the protection path of the service optical signal o11 with wavelength λ1 is fiber F4, the working path of the service optical signal o12 with wavelength λ2 is fiber F5, and the protection path of the service optical signal o12 with wavelength λ2 is fiber F4.

[0120] Assuming light source 54a is a broadband light source, wavelength selection switch 51a is used to output a first detection optical signal with wavelength λa from the detection optical signal oS1 to fiber F3 and a second detection optical signal with wavelength λb from the detection optical signal oS1 to fiber F5 when both fiber F3 and fiber F5 are faulty. In network device 60, wavelength selection switch 61a is also used to transmit the first detection optical signal received through fiber F3 to detection device 64a and the second detection optical signal received through fiber F5 to detection device 64a. Detection device 64a is used to determine whether fiber F3 is faulty based on the first detection optical signal and whether fiber F5 is faulty based on the second detection optical signal. Such light source 54a can simultaneously output detection optical signals to multiple fibers, allowing detection device 64a to detect multiple fibers simultaneously, resulting in high detection efficiency. The wavelength of either the first or second detection optical signal in detection optical signal oS1 is different from the wavelength of any service optical signal in the first transmission optical signal oH1.

[0121] Assuming light source 54a is a fixed-wavelength light source, wavelength selection switch 51a is used to output detection optical signals oS1 to fibers F3 and F5 in a time-division multiplexing manner when both fibers F3 and F5 are faulty. For example, it outputs detection optical signals oS1 to fiber F3 in a first time period and to fiber F5 in a second time period. In network device 60, wavelength selection switch 61a is also used to transmit the detection optical signals oS1 received through fibers F3 and F5 to detection device 64a in a time-division multiplexing manner when both fibers F3 and F5 are faulty. For example, it transmits the detection optical signals oS1 received through fiber F4 to detection device 64a in a first time period and to fiber F5 in a second time period. Detection device 64a is used to determine whether fiber F4 is faulty based on the detection optical signals oS1 in the first time period and whether fiber F5 is faulty based on the detection optical signals oS1 in the second time period. Such light source 54a can detect multiple fibers in a time-division multiplexing manner.

[0122] In the third embodiment, refer to Figure 4 As shown, Figure 4In the network device 50 shown, wavelength selection switch 51a is used to output the second optical signal from the first transmitted optical signal OH1 to optical fiber F3 and to output the detection optical signal OS1 to optical fiber F5 when optical fiber F3 is functioning normally. The first transmitted optical signal OH1 includes the second optical signal, and the wavelengths of the first and second optical signals are different. For example, the first optical signal is the service optical signal OS11, and the second optical signal is the service optical signal OS12. In network device 60, wavelength selection switch 61a is used to output the second optical signal received through optical fiber F3 from the common port a21 when optical fiber F3 is functioning normally, and to transmit the detection optical signal OS1 received through optical fiber F5 to the detection device 64a.

[0123] Wavelength selection switch 51a is also used to output a second optical signal to fiber F5 in the event of a failure of fiber F3. Wavelength selection switch 61a in network device 60 is used to output the second optical signal received through fiber F5 from common port a21 in the event of a failure of fiber F5.

[0124] In this case, the working path of the service optical signal o11 with wavelength λ1 is fiber F3, the protection path of the service optical signal o11 with wavelength λ1 is fiber F4, the working path of the service optical signal o12 with wavelength λ2 is fiber F3, and the protection path of the service optical signal o12 with wavelength λ2 is fiber F5.

[0125] Assuming light source 54a is a broadband light source, wavelength selection switch 51a is used to output a first detection optical signal with wavelength λa from detection optical signal OS1 to fiber 4 and a second detection optical signal with wavelength λb from detection optical signal OS1 to fiber 5, when fiber optic F3 is functioning normally. In network device 60, wavelength selection switch 61a is also used to transmit the first detection optical signal received through fiber optic F4 to detection device 64a, and the second detection optical signal received through fiber optic F5 to detection device 64a. Detection device 64a is used to determine whether fiber optic F4 is faulty based on the first detection optical signal and whether fiber optic F5 is faulty based on the second detection optical signal.

[0126] Assuming light source 54a is a fixed-wavelength light source, wavelength selection switch 51a is used to output detection optical signal oS1 to optical fibers F4 and F5 in a time-division manner when fiber F3 is normal. In network device 60, wavelength selection switch 61a is also used to transmit the detection optical signal oS1 received through optical fibers F4 and F5 to detection device 64a in a time-division manner when fiber F3 is normal.

[0127] For example, such as Figure 4As shown, network device 50 includes an optical amplifier 55d disposed between the branch port b13 of wavelength selective switch 51a and optical fiber F5. Network device 60 includes an optical amplifier 65d disposed between optical fiber F5 and branch port b23 of wavelength selective switch 61a.

[0128] In some embodiments, refer to Figure 5 As shown, compared to Figure 3 The network device 50 shown is... Figure 5 The network device 50 shown also includes a wavelength selection switch 51b, which is also referred to as a second wavelength selection switch. The wavelength selection switch 51b includes a common port a31 and multiple second branch ports, each connected to multiple optical fibers. The multiple second branch ports of the wavelength selection switch 51b include branch port b31 and branch port b32. The common port a31 is also referred to as a third common port.

[0129] The branch port b31 of the wavelength selection switch 51b is connected to the optical fiber F3, and the branch port b32 of the wavelength selection switch 51b is connected to the optical fiber F4. Both optical fibers F3 and F4 are connected to the network device 60.

[0130] Wavelength selection switch 51b is used to receive the second transmitted optical signal OH2 through the common port a31. When fiber F3 is normal, it outputs a third optical signal from the second transmitted optical signal OH2 to fiber F3. The wavelength of the third optical signal is different from the wavelength of the first optical signal. Wavelength selection switch 51b is also used to output the third optical signal from the second transmitted optical signal OH2 to fiber F4 when fiber F3 is faulty.

[0131] In one embodiment, Figure 5 The network device 50 shown is connected to an optical transceiver. The network device 50 also includes a multiplexer 52b. The common port a31 of the wavelength selection switch 51b is connected to the common port c21 of the multiplexer 52b. The multiplexer 52b is a tributary-side multiplexer, and its multiple branch ports are respectively connected to multiple optical transceivers. Figure 5 The multiple optical transceivers connected to the multiplexer 52b shown include optical transceiver 30c and optical transceiver 30d. The multiple branch ports of the multiplexer 52b include branch port d21 and branch port d22. Optical transceiver 30c is connected to branch port d21 of the multiplexer 52b, and optical transceiver 30d is connected to branch port d22 of the multiplexer 52b.

[0132] The multiplexer 52b is used to combine optical signals output from multiple optical transceivers and output a second transmission optical signal OH2 to the wavelength selection switch 51b. Specifically, as shown... Figure 5The network device 50 shown has an optical transceiver 30c that outputs an optical signal o13 with wavelength λ3, and an optical transceiver 30d that outputs an optical signal o14 with wavelength λ4. λ1, λ2, λ3, and λ4 are all different in pairs. A multiplexer 52b is used to combine optical signals o13 and o14, and output a second transmission optical signal oH2 to the common port a31 of the wavelength selection switch 51b. The second transmission optical signal oH2 includes optical signals o13 and o14.

[0133] When both wavelength selection switches 51a and 51b need to transmit optical signals to fiber F3, or when both wavelength selection switches 51a and 51b need to transmit optical signals to fiber F4, refer to... Figure 5 As shown, network device 50 also includes optical devices 57a and 57b. Optical device 57a is also referred to as the first optical device, and optical device 57b is also referred to as the second optical device. Optical device 57a includes a common port i11, a branch port j11, and a branch port j12. Common port i11 is also referred to as the fourth common port, branch port j11 is also referred to as the third branch port, and branch port j12 is also referred to as the fourth branch port. Common port i11 of optical device 57a is connected to branch port j11, and common port i11 of optical device 57a is connected to branch port j12. Common port i11 can also be referred to as the fourth common port, branch port j11 is also referred to as the sixth branch port, and branch port j12 is also referred to as the seventh branch port. The common port i11 of optical device 57a is connected to optical fiber F3, the branch port j11 of optical device 57a is connected to the branch port b11 of wavelength selective switch 51a, and the branch port j12 of optical device 57a is connected to the branch port b31 of wavelength selective switch 51b.

[0134] Optical device 57b includes a common port i21, a branch port j21, and a branch port j22. Common port i21 is also referred to as the fifth common port, branch port j21 as the fifth branch port, and branch port j22 as the sixth branch port. Common port i21 and branch port j21 of optical device 57b are connected, as are branch ports j22. Common port i21 can also be referred to as the fifth common port, branch port j21 as the eighth branch port, and branch port j22 as the ninth branch port. The common port and i21 of optical device 57b are connected to optical fiber F4. Branch port j21 of optical device 57b is connected to branch port b12 of wavelength selective switch 51a, and branch port j22 of optical device 57a is connected to branch port b32 of wavelength selective switch 51b.

[0135] For example, optical device 57a includes a wavelength selective switch and a beam splitter, and optical device 57b includes a wavelength selective switch and a beam splitter, which is also called an optical coupler.

[0136] Reference Figure 5 As shown, compared to Figure 3 The network device 60 shown includes a wavelength selective switch 61b, also referred to as the fourth wavelength selective switch. Wavelength selective switch 61b includes a common port a41 and multiple eighth branch ports, each connected to multiple optical fibers. The multiple eighth branch ports of wavelength selective switch 61b include branch ports b41 and b42. Common port a41 is also referred to as the eighth common port. Branch port b41 of wavelength selective switch 61b is connected to optical fiber F3, and branch port b42 of wavelength selective switch 61b is connected to optical fiber F4. Both optical fibers F3 and F4 are connected to network device 50.

[0137] Wavelength selection switch 61b is used to output the third optical signal received through fiber F3 from common port a41 when fiber F3 is functioning normally. Wavelength selection switch 61b is also used to output the third optical signal received through fiber F4 from common port a41 when fiber F3 is faulty.

[0138] In one embodiment, Figure 5 The network device 60 shown is connected to an optical transceiver. The network device 60 also includes a wavelength divider 62b. The common port a41 of the wavelength selection switch 61b is connected to the common port e21 of the wavelength divider 62b. The wavelength divider 62b is a tributary-side wavelength divider, and its multiple branch ports are respectively connected to multiple optical transceivers. Figure 5 The multiple optical transceivers connected to the demultiplexer 62b shown include optical transceiver 40c and optical transceiver 40d. The multiple branch ports of the demultiplexer 62b include branch port f21 and branch port f22. Optical transceiver 40c is connected to branch port f21 of the demultiplexer 62b, and optical transceiver 40d is connected to branch port f22 of the demultiplexer 62b.

[0139] The wavelength division multiplexer 62b is used to output optical signals of different wavelengths from the third optical signal. Specifically, for example... Figure 5The network device 60 shown has an optical transceiver 40c receiving an optical signal with wavelength λ3, and an optical transceiver 40d receiving an optical signal with wavelength λ4. The branch port f21 of the demultiplexer 62b connected to the optical transceiver 40c transmits an optical signal with wavelength λ3, while the branch port f22 of the demultiplexer 62b connected to the optical transceiver 40d transmits an optical signal with wavelength λ4. When the third optical signal includes optical signal o13, the demultiplexer 62b transmits optical signal o13 to the corresponding optical transceiver 40c; when the third optical signal includes optical signal o14, the demultiplexer 62a transmits optical signal o14 to the corresponding optical transceiver 40d.

[0140] When both wavelength selective switches 61a and 61b need to receive optical signals through fiber optic F3, or when both wavelength selective switches 61a and 61b need to receive optical signals through fiber optic F4, refer to... Figure 5 As shown, network device 60 also includes optical devices 67a and 67b. Optical device 67a is also referred to as the third optical device, and optical device 67b is also referred to as the fourth optical device. Optical device 67a includes a common port i31, a branch port j31, and a branch port j32. Common port i31 is also referred to as the ninth common port, branch port j31 is also referred to as the ninth branch port, and branch port j32 is also referred to as the tenth branch port. Common port i31 of optical device 67a is connected to branch port j31, and common port i31 of optical device 67a is connected to branch port j32. Common port i31 can also be referred to as the fourth common port, branch port j31 is also referred to as the sixth branch port, and branch port j32 is also referred to as the seventh branch port. Common port i31 of optical device 67a is connected to optical fiber F3, branch port j31 of optical device 67a is connected to branch port b21 of wavelength selective switch 61a, and branch port j32 of optical device 67a is connected to branch port b41 of wavelength selective switch 61b.

[0141] Optical device 67b includes a common port i41, a branch port j41, and a branch port j42. Common port i41 is also referred to as the tenth common port, branch port j41 as the eleventh branch port, and branch port j42 as the twelfth branch port. Common port i41 and branch port j41 of optical device 67b are connected, as are branch ports j42. Common port i41 can also be referred to as the fifth common port, branch port j41 as the eighth branch port, and branch port j42 as the ninth branch port. The common port and i41 of optical device 67b are connected to optical fiber F4. Branch port j41 of optical device 67b is connected to branch port b22 of wavelength selective switch 61a, and branch port j42 of optical device 67b is connected to branch port b42 of wavelength selective switch 61b.

[0142] For example, optical device 67a includes a wavelength selective switch and a beam splitter. When optical device 67a is a wavelength selective switch, the wavelength selective switch can transmit the received first optical signal to wavelength selective switch 61a and the received third optical signal to wavelength selective switch 61b. When optical device 67a is a beam splitter, the beam splitter specifically divides the combined optical signal of the first optical signal and the third optical signal into two parts and transmits them to wavelength selective switch 61a and wavelength selective switch 61b respectively. The optical signal received by wavelength selective switch 61a includes the first optical signal, and the optical signal received by wavelength selective switch 61b includes the third optical signal. Wavelength selection switch 61a transmits a portion of the received optical signal to optical splitter 62a. Through the wavelength splitting function of optical splitter 62a, service optical signal o11 can be transmitted to optical transceiver 40a, and service optical signal o12 can be transmitted to optical transceiver 40b. Wavelength selection switch 61b transmits a portion of the received optical signal to optical splitter 62b. Through the wavelength splitting function of optical splitter 62b, optical signal o13 can be transmitted to optical transceiver 40c, and optical signal o14 can be transmitted to optical transceiver 40d.

[0143] For example, optical device 67b includes a wavelength selective switch and a beam splitter.

[0144] For example, such as Figure 5 As shown, network device 50 includes an optical amplifier 55e disposed between the common port c21 of the multiplexer 52b and the common port a31 of the wavelength selection switch 51b. Network device 60 includes an optical amplifier 65e disposed between the common port a41 of the wavelength selection switch 61b and the common port e21 of the demultiplexer 62a.

[0145] In some embodiments, refer to Figure 5 As shown, network device 50 may not include multiplexers 52a and 52b. Network device 50 includes multiple wavelength selection switches and multiple optical devices. The multiple wavelength selection switches include... Figure 5 The wavelength selection switches 51a and 51b shown include multiple optical devices. Figure 5 The optical devices 57a and 57b shown have multiple branch ports of any wavelength selective switch connected to one branch port of each of the multiple optical devices, and the common port of each optical device is connected to an optical fiber. The first common port of each wavelength selective switch is used to receive and transmit optical signals, and the second common port of at least one wavelength selective switch is connected to the light source 54a. The functions of wavelength selective switches 51a and 51b, optical devices 57a and 57b are as described in the above embodiment and will not be repeated here.

[0146] For example, such as Figure 6 As shown, compared to Figure 5 The network device 50 shown is... Figure 6 The network device 50 shown also includes optical devices 57c and 57d. The multiple first branch ports of wavelength selective switch 51a also include branch ports b13 and b14, and the multiple second branch ports of wavelength selective switch 51b also include branch ports b33 and b34. Branch port b13 of wavelength selective switch 51a is connected to branch port j51 of optical device 57c, and branch port b14 of wavelength selective switch 51a is connected to branch port j61 of optical device 57d. Branch port b33 of wavelength selective switch 51b is connected to branch port j52 of optical device 57c, and branch port b34 of wavelength selective switch 51b is connected to branch port j62 of optical device 57d. The common port i51 of optical device 57c is connected to optical fiber F6, and the common port i61 of optical device 57d is connected to optical fiber F7. Assuming that both fiber optic cables F6 and F7 are connected to network device 60, the wavelength selection switch 51a can be used to select the working path and protection path for any wavelength of the first transmitted optical signal OH1, and the wavelength selection switch 51b can be used to select the working path and protection path for any wavelength of the second transmitted optical signal OH2.

[0147] Assume that wavelength selective switch 51a selects fiber F3 as the working path and fiber F4 as the protection path for the first optical signal in the first transmitted optical signal OH1 within a certain time period; wavelength selective switch 51b selects fiber F6 as the working path and fiber F7 as the protection path for the third optical signal in the second transmitted optical signal OH2 within a certain time period. It is possible that wavelength selective switch 51a outputs detection optical signal oS1 to fibers F4 and F7 when fibers F3 and F6 are functioning normally.

[0148] In other embodiments, Figure 6 The wavelength selection switch 51b shown also includes a common port a32. Figure 6 The network device 50 shown also includes a light source 54b, and the common port a32 of the wavelength selective switch 51b is connected to the light source 54b. The light source 54b is used to output a detection optical signal oS2 to the wavelength selective switch 51b. The wavelength selective switch 51b is used to output the detection optical signal oS2 to the fiber 7 when fiber 6 is normal; and to output the detection optical signal oS2 to fiber 6 when fiber 6 is faulty.

[0149] In some embodiments, refer to Figure 5As shown, network device 60 may not include demultiplexers 62a and 62b. Network device 60 includes multiple wavelength selective switches and multiple optical devices. The optical devices include wavelength selective switches, and the multiple wavelength selective switches include... Figure 5 The wavelength selection switches 61a and 61b shown include multiple optical devices. Figure 5 The optical devices 67a and 67b shown have multiple branch ports of any wavelength selective switch connected to one branch port of each of the multiple optical devices, and the common port of each optical device is connected to an optical fiber. The first common port of each wavelength selective switch is used to output an optical signal, and the second common port of at least one wavelength selective switch is connected to the detection device 64a. The functions of wavelength selective switches 61a and 61b, optical devices 67a and 67b are as described in the above embodiment and will not be repeated here.

[0150] For example, such as Figure 7 As shown, compared to Figure 5 The network device 60 shown is... Figure 7 The network device 60 shown also includes optical devices 67c and 67d. Multiple seventh branch ports of wavelength selective switch 61a also include branch ports b23 and b24. Multiple eighth branch ports of wavelength selective switch 61b also include branch ports b43 and b44. Branch port b23 of wavelength selective switch 61a is connected to branch port j71 of optical device 67c, and branch port b24 of wavelength selective switch 61a is connected to branch port j81 of optical device 67d. Branch port b43 of wavelength selective switch 61b is connected to branch port j72 of optical device 67c, and branch port b44 of wavelength selective switch 61b is connected to branch port j82 of optical device 67d. The common port i71 of optical device 67c is connected to optical fiber F6, and the common port i81 of optical device 67d is connected to optical fiber F7. Assuming that both fiber optic cables F6 and F7 are connected to network device 50, the wavelength selection switch 61a can be used to receive optical signals input through either the working path or the protection path, and the wavelength selection switch 61b can be used to receive optical signals input through either the working path or the protection path.

[0151] Assume that wavelength selective switch 61a receives a first optical signal through working path fiber F3 or through protection path fiber F4 during a certain time period; wavelength selective switch 61b receives a third optical signal through working path fiber F6 or through protection path fiber F7 during a certain time period. Alternatively, when fibers F3 and F6 are functioning normally, wavelength selective switch 61a can transmit the detection optical signal oS1 received through fiber F4 or fiber F7 to detection device 64a.

[0152] In other embodiments, Figure 7 The wavelength selection switch 61b shown also includes a common port a42. Figure 7 The network device 60 shown also includes a detection device 64b, and the common port a42 of the wavelength selective switch 61b is connected to the detection device 64b. The wavelength selective switch 61b is used to transmit the detection optical signal oS2 received through fiber optic F7 to the detection device 64b when fiber optic F6 is functioning normally. The wavelength selective switch 61b is also used to transmit the detection optical signal oS2 received through fiber optic F6 to the detection device 64b when fiber optic F6 is faulty.

[0153] For example, Figures 3 to 5 The latitude of the network device 50 shown depends on the number of branch ports of the wavelength selection switch 51a. Since the number of branch ports of the wavelength selection switch is large, the latitude of the network device 50 is large. Figures 3 to 5 The latitude of the network device 60 shown depends on the number of branch ports of the wavelength selection switch 61a. Since the number of branch ports of the wavelength selection switch is large, the latitude of the network device 60 is large.

[0154] For example, based on Figure 3 The network device 50 shown also has a second signal transmission method. In this second signal transmission method, the wavelength selection switch 51a is used to output a first portion of the first optical signal in the first transmitted optical signal OH1 to fiber optic F3, and to output a second portion of the first optical signal in the first transmitted optical signal OH1 to fiber optic F4. For example, the first transmitted optical signal OH1 includes service optical signal o11 and service optical signal o12. The first optical signal in the first transmitted optical signal OH1 includes service optical signal o11 and / or service optical signal o12. For example, the ratio of the first portion of the first optical signal to the second portion of the first optical signal is 50:50, or 60:40, or 70:30, or 85:15, etc.

[0155] In the second signal transmission mode of the network device 50, the wavelength selection switch 51a is used to output a first portion of the first optical signal in the first transmitted optical signal OH1 to fiber F3, and a second portion of the first optical signal in the first transmitted optical signal OH1 to fiber F4. The working path of the first optical signal is fiber F3, and the protection path of the first optical signal is fiber F4, forming a protection relationship between fiber F3 and fiber F4. The first optical signal can be any service optical signal in the first transmitted optical signal. The wavelength selection switch 51a is connected to multiple optical fibers, including fiber F3 and fiber F4. Therefore, the network device 50 can use the wavelength selection switch 51a to select the working path and protection path for any service optical signal in the first transmitted optical signal, and transmit the first portion of the service optical signal to the working path and the second portion to the protection path. This avoids the need for multiple splitters in the network device 50 to select the working path and protection path for the service optical signal, improving the integration of the network device 50 and preventing the protection path from being unlit.

[0156] exist Figure 3 If the network device 50 shown also includes a multiplexer 52a, the function of the multiplexer 52a is the same as that of the multiplexer 52a in the first signal transmission method.

[0157] Corresponding to the second signal transmission method, in Figure 3 In the network device 60 shown, wavelength selection switch 61a is used to output a first portion of the first optical signal received through optical fiber F3 from common port a21 when optical fiber F3 is functioning normally. Wavelength selection switch 61a is also used to output a second portion of the first optical signal received through optical fiber F4 from common port a21 when optical fiber F3 is faulty.

[0158] exist Figure 3 If the network device 60 shown also includes a demultiplexer 62a, the function of the demultiplexer 62a is similar to that of the demultiplexer 62a in the first signal transmission method, and will not be described in detail here.

[0159] In the second signal transmission mode of the network device 60, when fiber optic F3 is functioning normally, the wavelength selective switch 61a outputs the first portion of the first optical signal received through fiber optic F3 from the common port a21; when fiber optic F3 fails, it outputs the second portion of the first optical signal received through fiber optic F4 from the common port a21. The network device 60 can receive the first optical signal transmitted to it through fiber optic F3 or fiber optic F4 via the wavelength selective switch 61a, thus establishing a protective relationship between fiber optic F3 and fiber optic F4. This avoids the need for multiple optical switches in the network device 60 to receive the optical signal transmitted through fiber optic F3 or fiber optic F4, improving the integration of the network device 60. Furthermore, the wavelength selective switch 61a in the network device 60 can receive both the first and second portions of the first optical signal. Therefore, the network device 60 can also detect whether fiber optic F3 is functioning normally based on the first portion of the first optical signal, and whether fiber optic F4 is functioning normally based on the second portion of the first optical signal.

[0160] Corresponding to the second signal transmission method, Figure 3 The controller 53 in the network device 50 shown is used to output a first control signal s1 to the wavelength selection switch 51a to indicate that the first optical signal includes service optical signal o11 and / or service optical signal o12 and that the output port of the first optical signal is branch port b11 and branch port b12.

[0161] Corresponding to the second signal transmission method, Figure 3 The control method of the network device 60 shown remains unchanged. When the controller 63 outputs the third control signal s3 to the wavelength selection switch 61a, the wavelength selection switch 61a outputs the first part of the first optical signal from the common port a21. When the controller 63 outputs the fourth control signal s4 to the wavelength selection switch 61a, the wavelength selection switch 61a outputs the second part of the first optical signal from the common port a21.

[0162] In the second signal transmission mode, after the controller 63 determines that the fiber optic F3 is faulty, the controller 63 outputs a fourth control signal to the wavelength selection switch 61a. The controller 63 does not need to transmit the information of the fiber optic F3 fault to the network device 50, but the controller 63 needs to generate alarm information to indicate the fiber optic F3 fault to the maintenance personnel.

[0163] Corresponding to the second signal transmission method, when the wavelength selection switch 61a outputs the first portion of the first optical signal received through fiber F3 from the common port a21, fiber F4 transmits the second portion of the first optical signal. Whether fiber F4 is faulty can be determined by the optical monitoring device installed between fiber F4 and the wavelength selection switch 61a. If the optical monitoring device determines that fiber F4 is faulty, it outputs monitoring information. The optical monitoring device is connected to the controller 63, which receives the monitoring information output by the optical monitoring device and generates alarm information based on the monitoring information. The alarm information is used to indicate to maintenance personnel that fiber F4 is faulty.

[0164] Corresponding to the second signal transmission method, network device 50 does not have a light source 54a, and network device 60 does not have a detection device 64a. In the case where network device 60 does not have a detection device 64a, network device 60 includes a first optical monitoring device and a second optical monitoring device. The branch port b21 of wavelength selection switch 61a is connected to optical fiber F3 through the first optical monitoring device, and the branch port b22 of wavelength selection switch 61a is connected to optical fiber F4 through the second optical monitoring device. The first optical monitoring device is used to determine whether optical fiber F3 is normal based on the optical signal received through optical fiber F3, and the second optical monitoring device is used to determine whether optical fiber F4 is normal based on the optical signal received through optical fiber F4.

[0165] Figure 4 The optical network 200 shown corresponds to the second signal transmission mode. In the first embodiment, the wavelength selection switch 51a in the network device 50 is used to output a first portion of the second optical signal in the first transmitted optical signal OH1 to fiber optic F3, and to output a second portion of the second optical signal in the first transmitted optical signal OH1 to fiber optic F4. The wavelength selection switch 61a in the network device 60 is used to output the first portion of the first optical signal and the first portion of the second optical signal received through fiber optic F3 from the common port a21 when fiber optic F3 is normal; and to output the second portion of the first optical signal and the second portion of the second optical signal received through fiber optic F4 from the common port a21 when fiber optic F3 is faulty.

[0166] The wavelength selection switch 51a can output other optical signals from the first transmitted optical signal to the optical fiber F5.

[0167] In the second embodiment, the wavelength selection switch 51a in network device 50 is used to output a first portion of the second optical signal in the first transmitted optical signal OH1 to fiber optic F3, and to output a second portion of the second optical signal in the first transmitted optical signal OH1 to fiber optic F5. The wavelength selection switch 61a in network device 60 is used to output the first portion of the second optical signal received through fiber optic F3 from common port a21 when fiber optic F3 is functioning normally; and to output the second portion of the second optical signal received through fiber optic F5 from common port a21 when fiber optic F3 is faulty.

[0168] In the third embodiment, the wavelength selection switch 51a in network device 50 is used to output a first portion of the second optical signal in the first transmitted optical signal OH1 to fiber optic F5, and to output a second portion of the second optical signal in the first transmitted optical signal OH1 to fiber optic F4. The wavelength selection switch 61a in network device 60 is used to output the first portion of the second optical signal received through fiber optic F5 from common port a21 when fiber optic F5 is functioning normally; and to output the second portion of the second optical signal received through fiber optic F4 from common port a21 when fiber optic F5 is faulty.

[0169] Figure 5 The network device 50 shown corresponds to the second signal transmission method. The wavelength selection switch 51b is used to output the first part of the third optical signal in the second transmitted optical signal OH2 to fiber optic F3, and to output the second part of the third optical signal in the second transmitted optical signal OH2 to fiber optic F4. The function of the multiplexer 52b is the same as that of the multiplexer 52b in the first signal transmission method.

[0170] Figure 5 The network device 60 shown corresponds to the second signal transmission mode. The wavelength selection switch 61b is used to output the first portion of the third optical signal received through fiber optic F3 from the common port a21 when fiber optic F3 is functioning normally; and to output the second portion of the third optical signal received through fiber optic F3 from the common port a21 when fiber optic F3 is faulty. The function of the demultiplexer 62b is the same as that of the demultiplexer 62b in the first signal transmission mode.

[0171] In some embodiments, refer to Figure 8 As shown in the figure, an embodiment of this application provides another structural schematic diagram of an optical network 200. Figure 8 The optical network 200 shown includes multiple network devices connected by optical fibers. Figure 8The network devices shown include network device 50 and network device 60. Network device 50 is also referred to as the first network device, and network device 60 is also referred to as the second network device.

[0172] Reference Figure 8 As shown, network device 50 includes an optical splitter 58a, a wavelength selective switch 59a, and a wavelength selective switch 59b. Optical splitter 58a is also referred to as the first optical splitter, wavelength selective switch 59a as the first wavelength selective switch, and wavelength selective switch 59b as the second wavelength selective switch. Optical splitter 58a is connected to the common port k11 of wavelength selective switch 59a and the common port k21 of wavelength selective switch 59b, respectively. Wavelength selective switch 59a also includes multiple first branch ports, each connected to multiple optical fibers. Wavelength selective switch 59b also includes multiple second branch ports, each connected to multiple optical fibers. The multiple optical fibers include optical fiber F3 and optical fiber F4.

[0173] For example, optical splitter 58a includes a common port h11, a branch port g11, and a branch port g12. Branch port g11 of optical splitter 58a is connected to the common port k11 of wavelength selective switch 59a, and branch port g12 of optical splitter 58a is connected to the common port k21 of wavelength selective switch 59b. Multiple first branch ports of wavelength selective switch 59a include branch port t11 ​​and branch port t12. Branch port t11 ​​of wavelength selective switch 59a is connected to fiber optic cable F3, and branch port t12 of wavelength selective switch 59a is connected to fiber optic cable F4. Multiple second branch ports of wavelength selective switch 59b include branch port t21 and branch port t22. Branch port t21 of wavelength selective switch 59b is connected to fiber optic cable F3, and branch port t22 of wavelength selective switch 59b is connected to fiber optic cable F4. Both fiber optic cables F3 and F4 are connected to network device 60.

[0174] In one embodiment, Figure 8 The network device 50 shown is connected to an optical transceiver. The network device 50 also includes a multiplexer 52a. The common port h11 of the optical splitter 58a is connected to the common port c11 of the multiplexer 52a. The multiplexer 52a is a tributary-side multiplexer, and its multiple branch ports are respectively connected to multiple optical transceivers. Figure 8 The connection relationship of the branch ports of the multiplexer 52a shown is as follows: Figure 3 The connection relationships of the branch ports of the multiplexer 52a shown are the same, and will not be repeated here.

[0175] The multiplexer 52a is used to combine the optical signals output from multiple optical transceivers and output the first transmission optical signal OH1 to the splitter 58a.

[0176] The beam splitter 58a is used to split the first transmitted optical signal OH1 into a first part transmitted optical signal OH1a and a second part transmitted optical signal OH1b, output the first part transmitted optical signal OH1a to the wavelength selection switch 59a, and output the second part transmitted optical signal OH1b to the wavelength selection switch 59b.

[0177] Wavelength selection switch 59a is used to output the fourth optical signal from the first part of the transmitted optical signal OH1a to fiber F3. Wavelength selection switch 59b is used to output the fifth optical signal from the second part of the transmitted optical signal OH1b to fiber F4, wherein the wavelength of the fourth optical signal is the same as the wavelength of the fifth optical signal. For example, the first transmitted optical signal OH1 includes service optical signals OH11 and OH12; therefore, the first part of the transmitted optical signal OH1a includes service optical signals OH11 and OH12, and the second part of the transmitted optical signal OH1b also includes service optical signals OH11 and OH12. The wavelength of the fourth optical signal is the same as the wavelength of the fifth optical signal; for example, the fourth optical signal includes service optical signals OH11 and OH12, and the fifth optical signal includes service optical signals OH11 and OH12; or, the fourth optical signal includes service optical signal OH11, and the fifth optical signal includes service optical signal OH11; or the fourth optical signal includes service optical signal OH12, and the fifth optical signal includes service optical signal OH12.

[0178] In this network device 50, the optical splitter 58a enables the wavelength selection switch 59a and the wavelength selection switch 59b to receive the first part of the transmitted optical signal OH1a and the second part of the transmitted optical signal OH1b, respectively. Wavelength selection switch 59a can transmit the fourth optical signal in the first part of the transmitted optical signal OH1a to fiber F3; wavelength selection switch 59b can transmit the fifth optical signal in the second part of the transmitted optical signal OH1b to fiber F4, and the wavelengths of the fourth and fifth optical signals are the same. Therefore, the fourth and fifth optical signals can be any one of the service optical signals in the first transmitted optical signal. Thus, the network device 50 can use the optical splitter 58a, wavelength selection switch 59a, and wavelength selection switch 59b to select the working path and protection path for any one of the service optical signals in the first transmitted optical signal, and transmit the service optical signal to the working path and protection path. This avoids the need for multiple optical splitters in the network device 50 to select the working path and protection path for the service optical signal, improving the integration of the network device 50 and preventing the protection path from being unlit. Furthermore, Figure 8 The network device 50 shown does not require a wavelength selection switch to split a certain wavelength of optical signal into two parts.

[0179] Reference Figure 8As shown, network device 60 includes a splitter 68a, a wavelength selective switch 69a, and a wavelength selective switch 69b. The splitter 68a is also referred to as the second splitter, the wavelength selective switch 69a as the third wavelength selective switch, and the wavelength selective switch 69b as the fourth wavelength selective switch. The splitter 68a is connected to the common port k31 of the wavelength selective switch 69a and the common port k41 of the wavelength selective switch 69b, respectively. The wavelength selective switch 69a also includes multiple seventh branch ports, each connected to multiple optical fibers. The wavelength selective switch 69b also includes multiple eighth branch ports, each connected to multiple optical fibers. The multiple optical fibers include optical fibers F3 and F4.

[0180] like Figure 8 As shown, the beam splitter 68a includes a common port h21, a branch port g21 and a branch port g22. The branch port g21 of the beam splitter 68a is connected to the common port k31 of the wavelength selective switch 69a, and the branch port g22 of the beam splitter 68a is connected to the common port k41 of the wavelength selective switch 69b.

[0181] Wavelength selective switch 69a has multiple seventh branch ports, including branch port t31 and branch port t32. Branch port t31 of wavelength selective switch 69a is connected to fiber optic cable F3, and branch port t32 of wavelength selective switch 69a is connected to fiber optic cable F4. Wavelength selective switch 69b has multiple eighth branch ports, including branch port t41 and branch port t42. Branch port t41 of wavelength selective switch 69b is connected to fiber optic cable F3, and branch port t42 of wavelength selective switch 69b is connected to fiber optic cable F4. Both fiber optic cables F3 and F4 are connected to network device 50.

[0182] Wavelength selective switch 69a is used to output the fourth optical signal received through fiber F3 to splitter 68a when fiber F3 is functioning normally, and wavelength selective switch 69b is used to turn off when fiber F3 is functioning normally; alternatively, wavelength selective switch 69a is used to turn off when fiber F3 is faulty, and wavelength selective switch 69b is used to output the fifth optical signal received through fiber F4 to splitter 68a when fiber F3 is faulty. The wavelength of the fourth optical signal is the same as the wavelength of the fifth optical signal.

[0183] Optical splitter 68a is used to output the received fourth or fifth optical signal through common port h21.

[0184] In one embodiment, Figure 8The network device 60 shown is connected to an optical transceiver. The network device 60 also includes a wavelength division multiplexer (WDM) 62a. The common port h21 of the WDM 68a is connected to the common port e11 of the WDM 62a. The WDM 62a is a tributary-side WDM, and its multiple branch ports are connected to multiple optical transceivers respectively. Figure 8 The connection relationship of the branch ports of the splitter 62a shown is as follows: Figure 3 The connection relationships of the branch ports of the splitter 62a shown are the same, and will not be repeated here.

[0185] The wavelength divider 62a is used to output optical signals of different wavelengths from the fourth or fifth optical signal respectively.

[0186] In this network device 60, wavelength selective switch 69a outputs the fourth optical signal received through fiber F3 to splitter 68a when fiber F3 is functioning normally, and wavelength selective switch 69b is closed when fiber F3 is functioning normally; alternatively, wavelength selective switch 69a is closed when fiber F3 fails, and wavelength selective switch 69b outputs the fifth optical signal received through fiber F4 to splitter 68a when fiber F3 fails, and the wavelength of the fourth optical signal is the same as the wavelength of the fifth optical signal. It is evident that network device 60 can receive optical signals transmitted to network device 60 through fiber F3 or fiber F4 through wavelength selective switches 69a and 69b, thus establishing a protective relationship between fiber F3 and fiber F4. This avoids the need for multiple optical switches in network device 60 to receive optical signals transmitted through fiber F3 or fiber F4, thereby improving the integration of network device 60. Furthermore, the network device 60 can receive the fourth optical signal and the fifth optical signal. Therefore, the network device 60 can also detect whether the fiber optic cable F3 is normal based on the fourth optical signal and whether the fiber optic cable F4 is normal based on the fifth optical signal.

[0187] For example, such as Figure 8 As shown, in network device 50, when the fourth and fifth optical signals are service optical signals o11, and service optical signal o12 needs to be output through fiber F3 or fiber F4, wavelength selective switch 59a can also be used to output the eighth optical signal in the first part of transmission optical signal oH1a to fiber F3 or fiber F4, the eighth optical signal including service optical signal o12. Alternatively, wavelength selective switch 59b can also be used to output the ninth optical signal in the second part of transmission optical signal oH1b to fiber F3 or fiber F4, the ninth optical signal including service optical signal o12.

[0188] When both wavelength selection switches 59a and 59b need to transmit optical signals to fiber F3, or when both wavelength selection switches 59a and 59b need to transmit optical signals to fiber F4, refer to... Figure 8 As shown, network device 50 also includes optical device 57a and optical device 57b, in Figure 8 In this configuration, the common port i11 of optical device 57a is connected to optical fiber F3, the branch port j11 of optical device 57a is connected to the branch port t11 ​​of wavelength selective switch 59a, and the branch port j12 of optical device 57a is connected to the branch port t21 of wavelength selective switch 59b. Figure 8 In this configuration, the common port i21 of optical device 57b is connected to optical fiber F4, the branch port j21 of optical device 57b is connected to the branch port t12 of wavelength selective switch 59a, and the branch port j22 of optical device 57b is connected to the branch port t22 of wavelength selective switch 59b. Specifically, in... Figure 8 In the example, the common port i11 of optical device 57a is referred to as the first common port. Figure 8 In the example, the common port i21 of the optical device 57b is referred to as the second common port.

[0189] For example, such as Figure 8 As shown, in network device 60, when the fourth and fifth optical signals are service optical signals o11, and service optical signal o12 is transmitted to network device 60 through fiber F3 or fiber F4, wavelength selection switch 69a is used to output the eighth or ninth optical signal received through fiber F3 to optical splitter 68a when fiber F3 is normal; wavelength selection switch 69b is used to output the eighth or ninth optical signal received through fiber F4 to optical splitter 68a when fiber F3 is faulty.

[0190] When both wavelength selective switches 69a and 69b need to receive optical signals through fiber optic F3, or when both wavelength selective switches 69a and 69b need to receive optical signals through fiber optic F4, refer to... Figure 8 As shown, network device 50 also includes optical device 67a and optical device 67b, in Figure 8 In this configuration, the common port i31 of optical device 67a is connected to optical fiber F3, the branch port j31 of optical device 67a is connected to the branch port t31 of wavelength selective switch 69a, and the branch port j32 of optical device 67a is connected to the branch port t31 of wavelength selective switch 69b. Figure 8 In this configuration, the common port i41 of optical device 67b is connected to optical fiber F4, the branch port j41 of optical device 67b is connected to the branch port t42 of wavelength selective switch 69a, and the branch port j42 of optical device 67b is connected to the branch port t42 of wavelength selective switch 69b. Specifically, in... Figure 8 In the example, the common port i31 of the optical device 67a is referred to as the third common port. Figure 8In the example, the common port i41 of the optical device 67b is referred to as the fourth common port.

[0191] For example, network device 60 includes a first optical monitoring device and a second optical monitoring device. The common port i31 of optical device 67a is connected to optical fiber F3 through the first optical monitoring device, and the common port i41 of optical device 67b is connected to optical fiber F4 through the second optical monitoring device. The first optical monitoring device is used to determine whether optical fiber F3 is normal based on the optical signal received through optical fiber F3, and the second optical monitoring device is used to determine whether optical fiber F4 is normal based on the optical signal received through optical fiber F4.

[0192] For example, Figure 8 The network device 60 shown also includes a controller, which is connected to wavelength selective switches 69a and 69b, a first detection device, and a second detection device. The controller receives information from the first optical monitoring device indicating whether fiber F3 is normal, and information from the second optical monitoring device indicating whether fiber F4 is normal. Based on the normality of fiber F3, the controller controls the branch port t31 of wavelength selective switch 69a to be connected to the common port k31, and the wavelength selective switch 69b to be closed. Based on the fault of fiber F3 and the normality of fiber F4, the controller controls the wavelength selective switch 69a to be closed, and the branch port t42 of wavelength selective switch 69b to be connected to the common port k41. For example, the controller is also configured to generate a first alarm message based on a fiber F3 fault, which indicates a fiber F3 fault to maintenance personnel, and generate a second alarm message based on a fiber F4 fault, which also indicates a fiber F4 fault to maintenance personnel.

[0193] In some embodiments, refer to Figure 9 As shown, compared to Figure 8 The network device 50 shown is... Figure 9 In the network device 50 shown, multiple optical fibers also include optical fiber F5, which is also referred to as a third optical fiber. Wavelength selection switches 59a and 59b are also connected to optical fiber F5. Exemplarily, multiple first branch ports of wavelength selection switch 59a also include branch port t13, which is connected to optical fiber F5; multiple second branch ports of wavelength selection switch 59b also include branch port t23, which is connected to optical fiber F5. (Refer to...) Figure 9 As shown, network device 50 also includes optical device 57c, in Figure 9 In the optical device 57c, the common port i51 is connected to the optical fiber F5, the branch port j51 of the optical device 57c is connected to the branch port t13 of the wavelength selective switch 59a, and the branch port j52 of the optical device 57c is connected to the branch port t23 of the wavelength selective switch 59b.

[0194] Figure 9 In the network device 60 shown, multiple optical fibers also include optical fiber F5. Wavelength selection switches 69a and 69b are also connected to optical fiber F5. Exemplarily, multiple first branch ports of wavelength selection switch 69a also include branch port t33, which is connected to optical fiber F5; multiple second branch ports of wavelength selection switch 69b also include branch port t43, which is connected to optical fiber F5. (Refer to...) Figure 9 As shown, network device 60 also includes optical device 67c, in Figure 9 In the optical device 67c, the common port i61 is connected to the optical fiber F5, the branch port j61 of the optical device 67c is connected to the branch port t33 of the wavelength selection switch 69a, and the branch port j62 of the optical device 67c is connected to the branch port t43 of the wavelength selection switch 69b.

[0195] In the first example, in network device 50, wavelength selection switch 59a is used to output other optical signals from the first part of the transmitted optical signal OH1a to fiber optic F5. Alternatively, wavelength selection switch 59b is used to output other optical signals from the second part of the transmitted optical signal OH1b to fiber optic F5, the wavelength of which is different from the wavelength of the fourth optical signal. In network device 60, wavelength selection switch 69a is used to output other optical signals received through fiber optic F5 to optical splitter 68a when fiber optic F3 is functioning normally. Wavelength selection switch 69b is used to output other optical signals received through fiber optic F5 to optical splitter 68a when fiber optic F3 fails, the wavelength of which is different from the wavelength of the fourth optical signal.

[0196] In the second example, in network device 50, wavelength selection switch 59a is used to output the sixth optical signal from the first part of the transmitted optical signal OH1a to fiber optic F3, and wavelength selection switch 59b is used to output the seventh optical signal from the second part of the transmitted optical signal OH1b to fiber optic F5. The wavelength of the sixth optical signal is the same as that of the seventh optical signal, but different from that of the fourth optical signal. For example, the fourth and fifth optical signals include service optical signal OH11, and the sixth and seventh optical signals include service optical signal OH12. In network device 60, wavelength selection switch 69a is used to output the sixth optical signal received through fiber optic F3 to optical splitter 68a when fiber optic F3 is functioning normally. Wavelength selection switch 69b is used to output the seventh optical signal received through fiber optic F5 to optical splitter 68a when fiber optic F3 is faulty.

[0197] In the third example, in network device 50, wavelength selection switch 59a is used to output the sixth optical signal from the first part of the transmitted optical signal OH1a to fiber optic F5, and wavelength selection switch 59b is used to output the seventh optical signal from the second part of the transmitted optical signal OH1b to fiber optic F4. The wavelengths of the sixth and seventh optical signals are the same, but different from the wavelength of the fourth optical signal. In network device 60, wavelength selection switch 69a is used to output the sixth optical signal received through fiber optic F5 to optical splitter 68a when fiber optic F5 is functioning normally. Wavelength selection switch 69b is used to output the seventh optical signal received through fiber optic F4 to optical splitter 68a when fiber optic F5 is faulty.

[0198] This means Figure 8 or Figure 9 The wavelength selection switch 59a shown can be connected to multiple optical fibers. Figure 8 or Figure 9 The wavelength selection switch 59b shown can be connected to multiple optical fibers.

[0199] For example, Figure 8 and Figure 9 The latitude of the network device 50 shown depends on the number of branch ports of the wavelength selection switch 59a. Since the number of branch ports of the wavelength selection switch is large, the latitude of the network device 50 is large. Figure 8 and Figure 9 The latitude of the network device 60 shown depends on the number of branch ports of the wavelength selection switch 69a. Since the number of branch ports of the wavelength selection switch is large, the latitude of the network device 60 is large.

[0200] In some embodiments, refer to Figure 10 As shown in the figure, an embodiment of this application provides another structural schematic diagram of an optical network 200. Figure 10 The optical network 200 shown includes multiple network devices connected by optical fibers. Figure 10 The network devices shown include network device 50 and network device 60. Network device 50 is also referred to as the first network device, and network device 60 is also referred to as the second network device.

[0201] Reference Figure 10 As shown, network device 50 includes a multiplexer 52a and a splitter 58c. The splitter 58c includes a common port h51, a branch port g51, and a branch port g52.

[0202] The common port h51 of optical splitter 58c is connected to the common port c11 of multiplexer 52a. The branch port g51 of optical splitter 58c is connected to fiber F3, and the branch port g52 of optical splitter 58c is connected to fiber F4. Both fiber F3 and fiber F4 are connected to network device 60. Multiplexer 52a is a tributary-side multiplexer, and its multiple branch ports are connected to multiple optical transceivers. Figure 10 The connection relationship of the branch ports of the multiplexer 52a shown is as follows: Figure 3 The connection relationships of the branch ports of the multiplexer 52a shown are the same, and will not be repeated here.

[0203] The multiplexer 52a is used to combine the optical signals output from multiple optical transceivers and output the first transmission optical signal OH1 to the splitter 58c.

[0204] Optical splitter 58c is used to split the first transmitted optical signal OH1 into a first part transmitted optical signal OH1a and a second part transmitted optical signal OH1b, output the first part transmitted optical signal OH1a to optical fiber F3, and output the second part transmitted optical signal OH1b to optical fiber F4.

[0205] Reference Figure 10 As shown, network device 60 includes a wavelength demultiplexer 62a and a wavelength selection switch 69x. Wavelength selection switch 69x includes a common port h61, a branch port g61, and a branch port g62. The common port h61 of wavelength selection switch 69x is connected to the common port e11 of wavelength demultiplexer 62a. The branch port g61 of wavelength selection switch 69x is connected to fiber optic cable F3, and the branch port g62 of wavelength selection switch 69x is connected to fiber optic cable F4. Both fiber optic cables F3 and F4 are connected to network device 50. Wavelength demultiplexer 62a is a tributary-side demultiplexer, and its multiple branch ports are connected to multiple optical transceivers. Figure 10 The connection relationship of the branch ports of the splitter 62a shown is as follows: Figure 3 The connection relationships of the branch ports of the splitter 62a shown are the same, and will not be repeated here.

[0206] Wavelength selection switch 69x is used to output the first part of the transmission optical signal oH1a received through fiber F3 to optical splitter 68a when fiber F3 is normal; wavelength selection switch 69x is used to output the second part of the transmission optical signal oH1b received through fiber F4 to optical splitter 68a when fiber F3 is faulty.

[0207] Wavelength divider 62a is used to output optical signals of different wavelengths from the first part of the transmitted optical signal OH1a or the second part of the transmitted optical signal OH1a.

[0208] In some embodiments, refer to Figure 10As shown, Figure 10 The optical splitter 58c in the network device 50 shown also includes a branch port g53, which is connected to the optical fiber F5. Figure 10 The wavelength selection switch 69x in the network device 60 shown also includes a branch port g63, which is connected to the optical fiber F5.

[0209] Based on this, the optical splitter 58a in network device 50 is specifically used to split the first transmitted optical signal OH1 into a first part transmitted optical signal OH1a, a second part transmitted optical signal OH1b, and a third part transmitted optical signal OH1c, and output the third part transmitted optical signal OH1c to optical fiber F5. The wavelength selection switch 69x in network device 60 is used to output the first part transmitted optical signal OH1a received through optical fiber F3 to optical splitter 68a when optical fiber F3 is normal; the wavelength selection switch 69x is used to output the second part transmitted optical signal OH1b received through optical fiber F4 to optical splitter 68a when optical fiber F3 is faulty; and the wavelength selection switch 69x is used to output the third part transmitted optical signal OH1c received through optical fiber F5 to optical splitter 68a when both optical fibers F3 and F4 are faulty.

[0210] The wavelength divider 62a is used to output optical signals of different wavelengths from the third part, the fourth part, or the seventh part, respectively.

[0211] In some embodiments, refer to Figure 11 As shown, compared to Figure 10 The network device 50 shown is... Figure 11 The network device 50 shown also includes a multiplexer 52b and a splitter 58d. The splitter 58d includes a common port h71, a branch port g71, and a branch port g72.

[0212] The common port h71 of optical splitter 58d is connected to the common port c21 of multiplexer 52b. The branch port g71 of optical splitter 58d is connected to fiber F3, and the branch port g72 of optical splitter 58d is connected to fiber F4. Both fiber F3 and fiber F4 are connected to network device 60. Multiplexer 52b is a tributary-side multiplexer, and its multiple branch ports are connected to multiple optical transceivers. Figure 11 The connection relationship of the branch ports of the multiplexer 52b shown is as follows: Figure 5 The connection relationships of the branch ports of the multiplexer 52b shown are the same, and will not be repeated here.

[0213] The multiplexer 52b is used to combine the optical signals output from multiple optical transceivers and output the second transmission optical signal OH2 to the splitter 58d.

[0214] Optical splitter 58d is used to split the second transmitted optical signal OH2 into a third transmitted optical signal OH2a and a fourth transmitted optical signal OH2b, outputting the third transmitted optical signal OH2a to optical fiber F3 and the fourth transmitted optical signal OH2b to optical fiber F4.

[0215] When both optical splitters 58c and 58d need to transmit optical signals to fiber F3, or both optical splitters 58c and 58d need to transmit optical signals to fiber F4, refer to... Figure 11 As shown, network device 50 also includes optical device 57a and optical device 57b.

[0216] The common port i11 of optical device 57a is connected to optical fiber F3, the branch port j11 of optical device 57a is connected to the branch port g51 of optical splitter 58c, and the branch port j12 of optical device 57a is connected to the branch port g71 of optical splitter 58d.

[0217] The common port i21 of optical device 57b is connected to optical fiber F4, the branch port j21 of optical device 57b is connected to the branch port g52 of optical splitter 58c, and the branch port j22 of optical device 57a is connected to the branch port g72 of optical splitter 58d.

[0218] Reference Figure 11 As shown, network device 60 also includes a wavelength demultiplexer 62b and a wavelength selection switch 69y. Wavelength selection switch 69y includes a common port h81, a branch port g81, and a branch port g82. The common port h81 of wavelength selection switch 69y is connected to the common port e21 of wavelength demultiplexer 62b, the branch port g81 of wavelength selection switch 69y is connected to fiber optic cable F3, and the branch port g82 of wavelength selection switch 69y is connected to fiber optic cable F4. Both fiber optic cables F3 and F4 are connected to network device 50. Wavelength demultiplexer 62b is a tributary-side demultiplexer, and its multiple branch ports are connected to multiple optical transceivers. Figure 11 The connection relationship of the branch ports of the splitter 62b shown is as follows: Figure 5 The connection relationships of the branch ports of the splitter 62b shown are the same, and will not be repeated here.

[0219] Wavelength selection switch 69y is used to output the third part of the transmission optical signal oH2a received through fiber F3 to splitter 68b when fiber F3 is normal; wavelength selection switch 69y is used to output the fourth part of the transmission optical signal oH2b received through fiber F4 to splitter 68b when fiber F3 is faulty.

[0220] The wavelength divider 62b is used to output optical signals of different wavelengths from the third part of the transmitted optical signal OH2a or the fourth part of the transmitted optical signal OH2b.

[0221] Reference Figure 11 As shown, when both wavelength selection switches 69x and 69y need to receive optical signals through fiber optic F3, or when both wavelength selection switches 69x and 69y need to receive optical signals through fiber optic F4, refer to... Figure 11 As shown, network device 60 also includes optical device 67a and optical device 67b.

[0222] The common port of optical device 67a is connected to fiber F3 via i31, the branch port j31 of optical device 67a is connected to the branch port g61 of wavelength selective switch 69x, and the branch port j32 of optical device 67a is connected to the branch port g81 of wavelength selective switch 69y.

[0223] The common port of optical device 67b is connected to fiber F4 via i41. The branch port j41 of optical device 67b is connected to the branch port g62 of wavelength selective switch 69x. The branch port j42 of optical device 67b is connected to the branch port g82 of wavelength selective switch 69y.

[0224] In some embodiments, refer to Figure 11 As shown, network device 50 may not include multiplexers 52a and 52b. Network device 50 includes multiple optical splitters and multiple optical devices. The multiple optical splitters include... Figure 9 The beam splitters 58c and 58d shown include multiple optical devices. Figure 11 The connection relationship and function of the optical devices 57a and 57b shown are as follows: Figure 11 The corresponding descriptions will not be repeated here.

[0225] In some embodiments, refer to Figure 11 As shown, network device 60 may not include demultiplexers 62a and 62b. Network device 60 includes multiple wavelength selection switches and multiple optical devices. The multiple wavelength selection switches include... Figure 11 The wavelength selection switches 69x and 69y shown include multiple optical devices. Figure 11 The connection relationship and function of the optical devices 67a and 67b shown are as follows: Figure 11 The corresponding descriptions will not be repeated here.

[0226] For example, Figure 10 and Figure 11 The latitude of the network device 50 shown depends on the number of branch ports of the optical splitter 58c, typically Figure 10 and Figure 11When the number of branch ports of the optical splitter 58c shown is 9, the insertion loss of the optical splitter is relatively small, which is more suitable. The number of latitudes of the network device 50 is relatively small.

[0227] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of this application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

Claims

1. A network device, characterized in that, include: A first wavelength selection switch and a light source, wherein the first wavelength selection switch includes a first common port, a second common port and a plurality of first branch ports, and the second common port is connected to the light source; The plurality of first branch ports are respectively connected to a plurality of optical fibers, the plurality of optical fibers including first optical fibers and second optical fibers; The light source is used to output a detection light signal; The first wavelength selection switch is used to receive a first transmitted optical signal through the first common port and to receive the detection optical signal through the second common port; The first wavelength selection switch is also used to output the first optical signal from the first transmitted optical signal to the first optical fiber and the detection optical signal to the second optical fiber when the first optical fiber is normal; the wavelength of the detection optical signal is different from the wavelength of the first optical signal. The first wavelength selection switch is also used to output the first optical signal to the second optical fiber and the detection optical signal to the first optical fiber in the event of a failure of the first optical fiber.

2. The network device according to claim 1, characterized in that, The plurality of optical fibers also includes a third optical fiber; The first wavelength selection switch is also used to output the second optical signal from the first transmitted optical signal to the third optical fiber when the third optical fiber is normal; the wavelengths of the first optical signal and the second optical signal are different, and the wavelength of the detection optical signal is different from the wavelength of the second optical signal; The first wavelength selection switch is also used to output the second optical signal to the second optical fiber and the detection optical signal to the third optical fiber in the event of a fault in the third optical fiber.

3. The network device according to claim 2, characterized in that, The first wavelength selection switch is specifically used to output a first detection optical signal from the detection optical signal to the first optical fiber and a second detection optical signal from the detection optical signal to the third optical fiber when both the first optical fiber and the third optical fiber are faulty; the wavelengths of the first detection optical signal and the second detection optical signal are different. or, The first wavelength selection switch is specifically used to output the detection optical signal to the first optical fiber and the third optical fiber in a time-division manner when both the first optical fiber and the third optical fiber are faulty.

4. The network device according to claim 1, characterized in that, The plurality of optical fibers also includes a third optical fiber; The first wavelength selection switch is also used to output the second optical signal from the first transmitted optical signal to the first optical fiber and the detection optical signal to the third optical fiber when the first optical fiber is normal; the wavelengths of the first optical signal and the second optical signal are different, and the wavelength of the detection optical signal is different from the wavelength of the second optical signal. The first wavelength selection switch is also used to output the second optical signal to the third optical fiber in the event of a failure of the first optical fiber.

5. The network device according to claim 4, characterized in that, The first wavelength selection switch is specifically used to output a first detection optical signal from the detection optical signal to the second optical fiber and a second detection optical signal from the detection optical signal to the third optical fiber when the first optical fiber is normal. The wavelengths of the first detection optical signal and the second detection optical signal are different. Alternatively, the first wavelength selection switch is used to output the detection optical signal to the second and third optical fibers in a time-division manner when the first optical fiber is normal.

6. The network device according to any one of claims 1-5, characterized in that, The network device further includes a second wavelength selection switch, which includes a third common port and multiple second branch ports; the multiple second branch ports are respectively connected to the multiple optical fibers. The second wavelength selection switch is used to receive a second transmitted optical signal through the third common port, and when the first optical fiber is normal, output a third optical signal from the second transmitted optical signal to the first optical fiber; the wavelength of the third optical signal is different from the wavelength of the first optical signal, and the wavelength of the detection optical signal is different from the wavelength of the third optical signal. The second wavelength selection switch is also used to output the third optical signal to the second optical fiber in the event of a failure of the first optical fiber.

7. The network device according to claim 6, characterized in that, The network device further includes a first optical device and a second optical device; The first optical device includes a fourth common port, a third branch port, and a fourth branch port. The fourth common port is connected to the third branch port, and the fourth common port is connected to the fourth branch port. The third branch port is connected to one of the first branch ports of the first wavelength selection switch, and the fourth branch port is connected to one of the second branch ports of the second wavelength selection switch. The fourth common port is connected to the first optical fiber. The second optical device includes a fifth common port, a fifth branch port, and a sixth branch port. The fifth common port is connected to the fifth branch port, the fifth common port is connected to the sixth branch port, the fifth branch port is connected to another first branch port of the first wavelength selection switch, the sixth branch port is connected to another second branch port of the second wavelength selection switch, and the fifth common port is connected to the second optical fiber.

8. The network device according to any one of claims 1-7, characterized in that, The network device also includes a multiplexer; The multiplexer is connected to the first common port of the first wavelength selection switch; The multiplexer is used to output the first transmitted optical signal to the first wavelength selection switch.

9. A network device, characterized in that, include: A third wavelength selection switch and a detection device, wherein the third wavelength selection switch includes a sixth common port, a seventh common port and multiple seventh branch ports; The seventh common port is connected to the detection device; the plurality of seventh branch ports are respectively connected to a plurality of optical fibers, the plurality of optical fibers including a first optical fiber and a second optical fiber; The third wavelength selection switch is used to output the first optical signal received through the first optical fiber from the sixth common port when the first optical fiber is normal, and to transmit the detection optical signal received through the second optical fiber to the detection device; the wavelength of the detection optical signal is different from the wavelength of the first optical signal. The third wavelength selection switch is also used to output the first optical signal received through the second optical fiber from the sixth common port in the event of a failure of the first optical fiber, and to transmit the detection optical signal received through the first optical fiber to the detection device. The detection device is used to determine whether the optical fiber transmitting the detection optical signal is normal based on the received detection optical signal.

10. The network device according to claim 9, characterized in that, The plurality of optical fibers also includes a third optical fiber; The third wavelength selection switch is also used to output the second optical signal received through the third optical fiber from the sixth common port when the third optical fiber is normal; the wavelengths of the first optical signal and the second optical signal are different, and the wavelength of the detection optical signal is different from the wavelength of the second optical signal. The third wavelength selection switch is also used to output the second optical signal received through the second optical fiber from the sixth common port in the event of a fault in the third optical fiber, and to transmit the detection optical signal received through the third optical fiber to the detection device.

11. The network device according to claim 10, characterized in that, The third wavelength selection switch is specifically used to transmit a first detection optical signal received through the first optical fiber to the detection device and a second detection optical signal received through the third optical fiber to the detection device when both the first optical fiber and the third optical fiber are faulty; the detection optical signal includes the first detection optical signal and the second detection optical signal, and the wavelengths of the first detection optical signal and the second detection optical signal are different. or, The third wavelength selection switch is specifically used to transmit the detection optical signal received through the first optical fiber and the third optical fiber to the detection device in a time-division manner when both the first optical fiber and the third optical fiber are faulty.

12. The network device according to claim 9, characterized in that, The plurality of optical fibers also includes a third optical fiber; The third wavelength selection switch is used to output the second optical signal received through the first optical fiber from the sixth common port when the first optical fiber is normal, and to transmit the detection optical signal received through the third optical fiber to the detection device; the wavelengths of the first optical signal and the second optical signal are different, and the wavelength of the detection optical signal is different from the wavelength of the second optical signal. The third wavelength selection switch is also used to output the second optical signal received through the third optical fiber from the sixth common port in the event of a failure of the first optical fiber.

13. The network device according to claim 12, characterized in that, The third wavelength selection switch is specifically used to transmit the first detection optical signal received through the second optical fiber to the detection device and the second detection optical signal received through the third optical fiber to the detection device when the first optical fiber is normal; the detection optical signal includes the first detection optical signal and the second detection optical signal, and the wavelengths of the first detection optical signal and the second detection optical signal are different. or, The third wavelength selection switch is specifically used to transmit the detection optical signal received through the second and third optical fibers to the detection device in a time-division manner when the first optical fiber is normal.

14. The network device according to any one of claims 9-13, characterized in that, The network device further includes a fourth wavelength selection switch, which includes an eighth common port and multiple eighth branch ports; the multiple eighth branch ports are respectively connected to the multiple optical fibers. The fourth wavelength selection switch is used to output the third optical signal received through the first optical fiber from the eighth common port when the first optical fiber is normal; the wavelength of the third optical signal is different from the wavelength of the first optical signal, and the wavelength of the detection optical signal is different from the wavelength of the third optical signal. The fourth wavelength selection switch is also used to output the third optical signal received through the second optical fiber from the eighth common port in the event of a failure of the first optical fiber.

15. The network device according to claim 14, characterized in that, The network equipment also includes a third optical device and a fourth optical device; The third optical device includes a ninth common port, a ninth branch port, and a tenth branch port. The ninth common port is connected to the ninth branch port, and the ninth common port is connected to the tenth branch port. The ninth branch port is connected to one of the seventh branch ports of the third wavelength selection switch, and the tenth branch port is connected to one of the eighth branch ports of the second wavelength selection switch. The ninth common port is connected to the first optical fiber. The fourth optical device includes a tenth common port, an eleventh branch port, and a twelfth branch port. The tenth common port is connected to the eleventh branch port, and the tenth common port is connected to the twelfth branch port. The eleventh branch port of the fourth optical device is connected to another seventh branch port of the third wavelength selection switch, and the twelfth branch port of the fourth optical device is connected to another eighth branch port of the fourth wavelength selection switch. The tenth common port of the fourth optical device is connected to the second optical fiber.

16. The network device according to any one of claims 9-15, characterized in that, The network device also includes a wavelength demultiplexer; The wavelength divider is connected to the sixth common port of the third wavelength selection switch; The wavelength divider is used to transmit optical signals of different wavelengths from the received optical signal to different locations.

17. An optical network, characterized in that, include: A first network device, a second network device, and a plurality of optical fibers connecting the first network device and the second network device, the plurality of optical fibers including a first optical fiber and a second optical fiber, the first network device including the network device as described in any one of claims 1-8, and the second network device including the network device as described in any one of claims 9-16.

18. A network device, characterized in that, It includes a first beam splitter, a first wavelength selection switch, and a second wavelength selection switch; The two branch ports of the first beam splitter are respectively connected to the common port of the first wavelength selection switch and the common port of the second wavelength selection switch; The first wavelength selection switch further includes a plurality of first branch ports, which are respectively connected to a plurality of optical fibers; The second wavelength selection switch further includes a plurality of second branch ports, which are respectively connected to the plurality of optical fibers; The plurality of optical fibers includes a first optical fiber and a second optical fiber; The first optical splitter is used to split the first transmitted optical signal into a first part of the transmitted optical signal and a second part of the transmitted optical signal, output the first part of the transmitted optical signal to the first wavelength selection switch, and output the second part of the transmitted optical signal to the second wavelength selection switch. The first wavelength selection switch is used to output the fourth optical signal from the first portion of the transmitted optical signal to the first optical fiber; The second wavelength selection switch is used to output the fifth optical signal from the second part of the transmitted optical signal to the second optical fiber, wherein the wavelength of the fourth optical signal is the same as the wavelength of the fifth optical signal.

19. The network device according to claim 18, characterized in that, The plurality of optical fibers also includes a third optical fiber; The first wavelength selection switch is also used to output the sixth optical signal from the first portion of the transmitted optical signal to the first optical fiber; The second wavelength selection switch is also used to output the seventh optical signal in the second part of the transmitted optical signal to the third optical fiber, wherein the wavelength of the sixth optical signal is the same as the wavelength of the seventh optical signal, and the wavelength of the sixth optical signal is different from the wavelength of the fourth optical signal.

20. The network device according to claim 18, characterized in that, The plurality of optical fibers also includes a third optical fiber; The first wavelength selection switch is used to output the sixth optical signal from the first part of the transmitted optical signal to the third optical fiber; The second wavelength selection switch is used to output the seventh optical signal in the second part of the transmitted optical signal to the second optical fiber. The wavelength of the sixth optical signal is the same as the wavelength of the seventh optical signal, and the wavelength of the sixth optical signal is different from the wavelength of the fourth optical signal.

21. The network device according to any one of claims 18-20, characterized in that, The network device further includes a first optical device and a second optical device; The first optical device includes a first common port, a third branch port, and a fourth branch port. The first common port is connected to the third branch port and the first common port is connected to the fourth branch port. The third branch port is connected to one of the first branch ports of the first wavelength selection switch, and the fourth branch port is connected to one of the second branch ports of the second wavelength selection switch. The first common port is connected to the first optical fiber. The second optical device includes a second common port, a fifth branch port, and a sixth branch port. The second common port is connected to the fifth branch port and the sixth branch port. The fifth branch port is connected to another first branch port of the first wavelength selection switch, and the sixth branch port is connected to another second branch port of the second wavelength selection switch. The second common port is connected to the second optical fiber.

22. The network device according to any one of claims 18-21, characterized in that, The network device also includes a multiplexer; the multiplexer is connected to the common port of the first optical splitter; The multiplexer is used to output a first transmitted optical signal to the first optical splitter.

23. A network device, characterized in that, This includes a second beam splitter, a third wavelength selection switch, and a fourth wavelength selection switch; The two branch ports of the second beam splitter are respectively connected to the common port of the third wavelength selection switch and the common port of the fourth wavelength selection switch; The third wavelength selection switch also includes multiple seventh branch ports, which are respectively connected to multiple optical fibers; The fourth wavelength selection switch also includes a plurality of eighth branch ports, which are respectively connected to the plurality of optical fibers; The plurality of optical fibers includes a first optical fiber and a second optical fiber; The third wavelength selection switch is used to output a fourth optical signal received through the first optical fiber to the second optical splitter when the first optical fiber is normal. The fourth wavelength selection switch is used to be turned off when the first optical fiber is functioning normally. The third wavelength selection switch is also used to turn off in the event of a failure of the first optical fiber; The fourth wavelength selection switch is also used to output a fifth optical signal received through the second optical fiber to the second optical splitter in the event of a first optical fiber failure.

24. The network device according to claim 23, characterized in that, The plurality of optical fibers also includes a third optical fiber; The third wavelength selection switch is also used to output a sixth optical signal received through the first optical fiber to the second optical splitter when the first optical fiber is normal. The fourth wavelength selection switch is also used to output a seventh optical signal received through the third optical fiber to the second optical splitter in the event of a first optical fiber failure. The wavelength of the sixth optical signal is the same as that of the seventh optical signal, and the wavelength of the sixth optical signal is different from that of the fourth optical signal.

25. The network device according to claim 23, characterized in that, The plurality of optical fibers also includes a third optical fiber; The third wavelength selection switch is also used to output a sixth optical signal received through the third optical fiber to the second optical splitter when the third optical fiber is normal. The fourth wavelength selection switch is also used to output a seventh optical signal received through the second optical fiber to the second optical splitter in the event of a first optical fiber failure. The wavelength of the sixth optical signal is the same as that of the seventh optical signal, and the wavelength of the sixth optical signal is different from that of the fourth optical signal.

26. The network device according to any one of claims 23-25, characterized in that, The network equipment also includes a third optical device and a fourth optical device; The third optical device includes a third common port, a ninth branch port, and a tenth branch port. The third common port is connected to the ninth branch port and the tenth branch port. The ninth branch port is connected to a seventh branch port of the third wavelength selection switch. The tenth branch port is connected to an eighth branch port of the fourth wavelength selection switch. The third common port is connected to the first optical fiber. The fourth optical device includes a fourth common port, an eleventh branch port, and a twelfth branch port. The fourth common port is connected to the eleventh branch port and the twelfth branch port. The eleventh branch port is connected to another seventh branch port of the third wavelength selection switch, and the twelfth branch port is connected to another eighth branch port of the fourth wavelength selection switch. The fourth common port is connected to the second optical fiber.

27. The network device according to any one of claims 23-26, characterized in that, The network device further includes a wavelength division multiplexer; the wavelength division multiplexer is connected to the common port of the second optical splitter; The wavelength divider is used to transmit optical signals of different wavelengths from the received optical signal to different locations.

28. An optical network, characterized in that, include: A first network device, a second network device, and a plurality of optical fibers connecting the first network device and the second network device, the plurality of optical fibers including a first optical fiber and a second optical fiber, the first network device including the network device as described in any one of claims 18-22, and the second network device including the network device as described in any one of claims 23-27.

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