All-optical line switching system based on optical switch network

Abstract

The present invention provides an all-optical line switching system based on an optical switch network, comprising an optical switch having multiple optical switch communication modules; an optical line switching matrix provided within the optical switch, the optical line switching matrix comprising multiple optical ports; each optical switch communication module being connected to an optical switch communication module of another optical switch or an external switching node communication module; the optical signal transmitted between the optical switch communication module and the optical switch communication module or switching node communication module of another optical switch being communication light containing a data optical signal and a management optical signal, the communication light being formed by low-frequency modulation of the management optical signal superimposed on the data optical signal and / or by wavelength division multiplexing of the management optical signal and the data optical signal; after receiving the communication light, the optical switch communication module separates the data optical signal from the management optical signal and transmits the data optical signal to the corresponding optical port. The present invention can simultaneously transmit data optical signals and management optical signals.

Description

Technical Field

[0001] The present invention relates to the technical field of optical communication devices, in particular to an all-optical line switching system based on an optical switch network. Background Art

[0002] With the advancement of fiber-optic communication technology, the integration of optical switching equipment has increased year by year, and its application in communication networks has become increasingly widespread. Typical application scenarios include fiber-optic line switching in passive optical networks and storage area networks, where optical switches are widely used. Traditional all-optical line switches only have line switching functions but lack line switching management capabilities. In other words, they can only transmit data optical signals but cannot control the transmission address of data optical signals.

[0003] The Chinese invention patent application with publication number CN109451377A discloses an optical switch based on integrated hybrid switching technology, which has an optical wavelength switching sub-module and an optical packet switching sub-module. The optical wavelength switching sub-module is used to switch and transmit wavelength switching services, and the optical packet switching sub-module is used to switch and transmit packet switching services. This solution adds and drops the packet switching services to the transmission idle part of the wavelength switching services in a time-interleaved mode.

[0004] Because this type of optical switch needs to demodulate information about the switching type (wavelength switching or packet switching) from the high-speed signal to determine the subsequent low-speed and high-speed switching actions, the optical switch's structure is complex. Furthermore, since this method adds and drops packet switching services into the idle portion of wavelength switching services in a time-interleaved manner, it is effectively a form of time-division multiplexing transmission and does not alter the optical transmission routing or optical fiber. Furthermore, the subsequent parsing process requires a dedicated service identification module to distinguish between wavelength switching and packet switching services. This necessitates the use of a dedicated service identification module to accurately identify data services and then perform subsequent processing based on the identified service type. This type of system is opaque to the optical signal rate; any change in the transmit and receive signal rate requires the configuration of a new service identification module. Furthermore, this switch only provides switching functionality, lacking line (routing) management capabilities, making it impossible to build a switching network based solely on the switch. Summary of the Invention

[0005] The purpose of the present invention is to provide an all-optical line switching system which has low production cost, can transmit data optical signals and management optical signals simultaneously, and is easy to network, maintain and manage.

[0006] To achieve the above-mentioned objectives, the present invention provides an all-optical line switching system based on an optical switch network, comprising at least one optical switch, each optical switch having two or more optical switch communication modules. The optical switch employs a single-fiber bidirectional transmission mechanism and is internally provided with an M×N port or any-port-to-any-port optical line switching matrix. The optical line switching matrix includes multiple optical ports, each optical port being connected to an optical switch communication module. Each optical switch communication module is connected to an optical switch communication module of another optical switch or an external switching node communication module. The optical signal transmitted between the optical switch communication module and the optical switch communication module or switching node communication module of another optical switch is communication light containing a data optical signal and a management optical signal. The communication light is formed by low-frequency modulating the management optical signal and superimposing it on the data optical signal and / or by wavelength division multiplexing the management optical signal and the data optical signal. After receiving the communication light, the optical switch communication module separates the data optical signal from the management optical signal and transmits the data optical signal to the corresponding optical port.

[0007] In the present invention, the management optical signal contains various types of control / management information, such as the connection status of the optical interactive matrix, connection request information, request response information, etc. After demodulation, the management optical signal can be mainly used to change the transmission line of the data optical signal in the optical line switching matrix. At the same time, it also provides an independent and effective management information channel for the interconnection between the optical switch and external communication modules / switch nodes.

[0008] As can be seen from the above scheme, the optical switch communication module can receive communication light containing management optical signals and data optical signals, and can separate the management optical signals from the data optical signals, thereby transmitting the data optical signals to the optical line switching matrix. The management optical signals are used to select / change the transmission path of the data optical signals in the optical line switching matrix, thereby achieving control and management of the data optical signal transmission path. This method enables an all-optical line switching system based on an optical switch network to simultaneously transmit data optical signals and management optical signals, simplifying the implementation of the all-optical line switching system and adapting it to different types of optical switching networks, such as M×N port switching networks or any-to-any port switching networks.

[0009] In addition, since the data optical signal and the management optical signal are transmitted in a wavelength division multiplexing manner, or the management optical signal is modulated into the data optical signal, when separating the data optical signal and the management optical signal, only a wavelength division multiplexer or a demodulator is needed to achieve separation. The structure for separating the data optical signal and the management optical signal is simple, and there is no need to identify the service signal in advance. The all-optical line switching system remains transparent to the service / data optical signal, and the system is compatible with service / data optical signals of different rates and data structures.

[0010] A preferred solution is that the wavelength of the data optical signal is different from the wavelength of the management optical signal; the optical switch communication module is provided with a first wavelength division multiplexer and a first circulator, the first wavelength division multiplexer is used to separate the data optical signal and the management optical signal according to wavelength, and output the separated management optical signal to the first circulator.

[0011] It can be seen that when the wavelength of the data optical signal is different from the wavelength of the management optical signal, the optical switch communication module can separate the management optical signal from the data optical signal through the first wavelength division multiplexer. Therefore, bidirectional transmission of communication light can be achieved through a single optical fiber.

[0012] In a preferred solution, the first circulator receives the management optical signal output by the management optical signal transmitting module, and outputs the management optical signal to the management optical signal receiving module.

[0013] Thus, the first circulator can output the obtained management optical signal to the management optical signal receiving module, thereby processing the management optical signal. In addition, the first circulator can also obtain the management optical signal from the management optical signal transmitting module and transmit it to the first wavelength division multiplexer through the first circulator.

[0014] A further solution is that the switching node communication module has a second wavelength division multiplexer, and the data optical signal is bidirectionally transmitted between the second wavelength division multiplexer and the second circulator, and the management optical signal is bidirectionally transmitted between the second wavelength division multiplexer and the third circulator; the bidirectional transmission of communication light is realized between the first wavelength division multiplexer and the second wavelength division multiplexer through a single optical fiber.

[0015] It can be seen that the switching node communication module can separate or combine the data optical signal and the management optical signal through the second wavelength division multiplexer, so that bidirectional transmission of communication light can be achieved between the first wavelength division multiplexer and the second wavelength division multiplexer through a single optical fiber, thereby meeting the requirement of the optical switching system to simultaneously transmit management optical signals and data optical signals.

[0016] An optional solution is that the optical switch communication module is provided with a third wavelength division multiplexer and a fourth wavelength division multiplexer, the third wavelength division multiplexer is used to separate the data optical signal and the management optical signal according to wavelength, and output the separated management optical signal to the fourth wavelength division multiplexer; the fourth wavelength division multiplexer receives the management optical signal output by the third management optical signal transmitting module, and outputs the management optical signal transmitted from the third wavelength division multiplexer to the fourth wavelength division multiplexer to the third management optical signal receiving module.

[0017] It can be seen that the optical switch communication module uses a two-stage wavelength division multiplexer to split and process optical signals of multiple different wavelengths, which can meet the transmission of three different wavelength optical signals.

[0018] A further solution is that the switching node communication module has a fifth wavelength division multiplexer, data optical signals are bidirectionally transmitted between the fifth wavelength division multiplexer and the fourth circulator, and management optical signals are bidirectionally transmitted between the fifth wavelength division multiplexer and the sixth wavelength division multiplexer; the sixth wavelength division multiplexer receives the management optical signal output by the fourth management optical signal transmitting module, and outputs the management optical signal transmitted from the fifth wavelength division multiplexer to the sixth wavelength division multiplexer to the fourth management optical signal receiving module.

[0019] It can be seen that the switching node communication module is also provided with a two-stage wavelength division filter, which can process the transmission of three optical signals with different wavelengths.

[0020] A further solution is that the wavelength of the management optical signal emitted by the third management optical signal transmitting module is different from the wavelength of the management optical signal received by the third management optical signal receiving module; the wavelength of the management optical signal emitted by the fourth management optical signal transmitting module is different from the wavelength of the management optical signal received by the fourth management optical signal receiving module; the wavelength of the management optical signal emitted by the third management optical signal transmitting module is the same as the wavelength of the management optical signal received by the fourth management optical signal receiving module; and the wavelength of the management optical signal emitted by the fourth management optical signal transmitting module is the same as the wavelength of the management optical signal received by the third management optical signal receiving module.

[0021] It can be seen that the system can use two management optical signals of different wavelengths, so that the wavelength of the upstream management optical signal is different from the wavelength of the downstream management optical signal, making the transmission of the management optical signal more flexible.

[0022] An optional solution is that the wavelength of the data optical signal is the same as the wavelength of the management optical signal; the optical switch communication module is provided with a first optical splitter, a fifth circulator and a sixth circulator. The first optical splitter splits the communication light according to a preset ratio and outputs a part of the communication light to the first management optical signal demodulation module, and outputs the other part of the communication light to the fifth circulator. The fifth circulator receives the management optical signal output by the first management optical signal modulation module, and the fifth circulator outputs the communication optical signal to the sixth circulator.

[0023] It can be seen that although the wavelength of the data optical signal is the same as the wavelength of the management optical signal, the modulation frequency of the data optical signal is much higher than the modulation frequency of the management optical signal. The use of the first management optical signal demodulation module can demodulate the management optical signal from the communication light without the need to set up a data / service identification module to identify the data optical signal, which can reduce the complexity of the optical switching system.

[0024] A further solution is that the sixth circulator is further connected to a low-frequency signal suppression module. Thus, the low-frequency signal suppression module suppresses / filters the management optical signal to prevent the management optical signal from interfering with the data optical signal.

[0025] A further solution is that the switching node communication module has a seventh circulator and a second optical splitter, the seventh circulator outputs communication light to the second optical splitter, and the second optical splitter outputs the communication optical signal to the third data optical signal receiving module and the second management optical signal demodulation module; the seventh circulator also receives the communication optical signal output by the second management optical signal modulation module.

[0026] It can be seen that the switching node communication module can realize the modulation and demodulation of the management optical signal respectively through the second management optical signal modulation module and the second management optical signal demodulation module, thereby realizing the loading and separation of the management optical signal on the data optical signal, thereby meeting the requirement of simultaneous transmission of the management optical signal and the data optical signal.

[0027] An optional solution is that the optical switch communication module is provided with a seventh wavelength division multiplexer, an eighth circulator, a ninth circulator and a third optical splitter, the seventh wavelength division multiplexer and the eighth circulator transmit communication light, and the seventh wavelength division multiplexer receives the management optical signal output by the fifth management optical signal transmission module; the eighth circulator outputs communication light to the third optical splitter, and the third optical splitter outputs communication light to the third management optical signal demodulation module and the ninth circulator; the ninth circulator is also connected to the low-frequency signal suppression module.

[0028] A further solution is that the switching node communication module has an eighth wavelength division multiplexer and a tenth circulator, and communication light is transmitted bidirectionally between the eighth wavelength division multiplexer and the tenth circulator. The management optical signal received by the eighth wavelength division multiplexer is output to the fifth management optical signal receiving module; the tenth circulator outputs the data optical signal to the fourth data optical signal receiving module, and the tenth circulator also receives the communication optical signal output by the third management optical signal modulation module.

[0029] It can be seen that under this solution, the management optical signal can use two different wavelengths, while the wavelength of the data optical signal is the same as the wavelength of one of the management optical signals. Through wavelength division multiplexing technology, the two different wavelengths of communication light can be separated, and through modulation technology, the requirement of transmitting data optical signals and management optical signals on the same wavelength can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural block diagram of the first embodiment of the all-optical line switching system based on an optical switch network of the present invention.

[0031] Figure 2 This is a structural block diagram of the second embodiment of the all-optical line switching system based on the optical switch network of the present invention.

[0032] Figure 3 This is a structural block diagram of an optical switch communication module and a switching node communication module in the third embodiment of the all-optical line switching system based on an optical switch network of the present invention.

[0033] Figure 4 It is a structural block diagram of an optical switch communication module and a switching node communication module in the fourth embodiment of the all-optical line switching system based on an optical switch network of the present invention.

[0034] Figure 5 It is a structural block diagram of the optical switch communication module and the switching node communication module in the fifth embodiment of the all-optical line switching system based on the optical switch network of the present invention.

[0035] Figure 6 It is a structural block diagram of an optical switch communication module and a switching node communication module in the sixth embodiment of the all-optical line switching system based on an optical switch network of the present invention.

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0037] The all-optical line switching system based on an optical switch network of the present invention can be applied to application scenarios such as optical fiber line switching in passive optical networks and optical fiber line switching in storage area networks. It can also achieve bidirectional transmission of data optical signals and management optical signals through a single optical fiber, so that the all-optical line switching system based on an optical switch network can simultaneously transmit data optical signals and management optical signals, and the structure of the all-optical line switching system is simple.

[0038] The optical switch network-based all-optical line switching system of the present invention comprises one or more optical switches, which are the core functional components for implementing optical line switching. Optical switches, on the one hand, must transmit optical data signals, and on the other hand, they must exchange management and control information with various hosts (e.g., servers, peer switch ports, and lower-layer aggregation switches). This involves processing connection requests, connection removals, status feedback, routing status feedback, and other required information. While this management and control information requires far less data flow and bandwidth than the information or data in high-speed data channels, it is crucial for achieving high-speed, efficient communication across the entire communication link.

[0039] The all-optical line switching system of the present invention is applied to a single-fiber bidirectional transmission system. The system integrates optical transceiver modules, realizes the transmission of control and routing signals based on the optical fiber link, and completes the connection between the designated input optical port and the output optical port. In addition, the system exchanges control / management information between the optical switch and the communication terminal based on the optical fiber link, which facilitates the use of existing network equipment, optical fibers or optical cable channels, and simplifies the physical structure of the network.

[0040] First embodiment:

[0041] See also Figure 1The all-optical line switching system of this embodiment has two optical switches, namely a first optical switch 10 and a second optical switch 30, wherein the first optical switch 10 includes a first optical line switching array 20 and multiple optical switch communication modules, for example, including a first optical switch communication module 11, a second optical switch communication module 12, a third optical switch communication module 13, a fourth optical switch communication module 14, etc., wherein the first optical line switching array 20 is provided with multiple optical ports, for example, including a first optical port 21, a second optical port 22, a third optical port 23, and a fourth optical port 24. The number of optical ports is equal to the number of optical switch communication modules and corresponds one to one. Each optical port is connected to a corresponding optical switch communication module, for example, the first optical port 21 is connected to the first optical switch communication module 11, the second optical port 22 is connected to the second optical switch communication module 12, and so on.

[0042] The structure of the second optical switch 30 is the same as that of the first optical switch 10. Specifically, the second optical switch 30 includes a second optical line switching array 40 and multiple optical switch communication modules, for example, a fifth optical switch communication module 31, a sixth optical switch communication module 32, a seventh optical switch communication module 33, and an eighth optical switch communication module 34. The optical line switching array 40 is provided with multiple optical ports, including a fifth optical port 41, a sixth optical port 42, a seventh optical port 43, an eighth optical port 44, etc. The number of optical ports is equal to the number of optical switch communication modules and corresponds one to one. Each optical port is connected to a corresponding optical switch communication module. For example, the fifth optical port 41 is connected to the fifth optical switch communication module 31, the sixth optical port 42 is connected to the sixth optical switch communication module 32, and so on.

[0043] Taking the first optical switch 10 as an example, the first optical line switching matrix 20 is a switching matrix capable of inputting and outputting optical data signals from any optical port. Its implementation structure can refer to the optical switch array disclosed in CN119247552A. Therefore, the first optical line switching matrix 20 can receive signals output by each optical switch communication module. Specifically, the optical switch communication modules can transmit the data optical signals to the corresponding optical ports and change the input and output relationships of the optical lines based on the management optical signals output by each optical switch communication module, thereby achieving optical line management and control of the data optical signals. Figure 1 In the figure, the dot-dashed line is the transmission path of the data optical signal.

[0044] Each optical switch communication module has the same internal structure. Taking the second optical switch communication module 12 as an example, it communicates with the seventh optical switch communication module 33 of the second optical switch 30 via a single optical fiber. The optical signal transmitted between the second optical switch communication module 12 and the seventh optical switch communication module 33 is a communication light including a data optical signal and a management optical signal. The communication light is formed by low-frequency modulating the management optical signal and superimposing it on the data optical signal and / or by wavelength division multiplexing the management optical signal and the data optical signal. Figure 1 The solid line in the middle is the transmission path of the communication light.

[0045] Second embodiment:

[0046] See also Figure 2 In a second embodiment of an all-optical line switching system based on an optical switch network, the all-optical line switching system may be provided with only a third optical switch 50. The third optical switch 50 includes a third optical line switching array 60 and a plurality of optical switch communication modules, including a ninth optical switch communication module 51, a tenth optical switch communication module 52, an eleventh optical switch communication module 53, and a twelfth optical switch communication module 54. The third optical line switching array 60 is provided with a plurality of optical ports, including a ninth optical port 61, a tenth optical port 62, an eleventh optical port 63, a twelfth optical port 64, and the like. The number of optical ports is equal to the number of optical switch communication modules and corresponds one to one. Each optical port is connected to a corresponding optical switch communication module. For example, the ninth optical port 61 is connected to the ninth optical switch communication module 51, the tenth optical port 62 is connected to the tenth optical switch communication module 52, and so on.

[0047] Each optical switch communication module can be connected to an external switching node via a single optical fiber. Each switching node has a switching node communication module. For example, the ninth optical switch communication module 51 is connected to the first switching node communication module 81 of the first switching node 71 via a single optical fiber, enabling bidirectional transmission of communication light between the ninth optical switch communication module 51 and the first switching node communication module 81. Similarly, the tenth optical switch communication module 52 is connected to the second switching node communication module 82 of the second switching node 72 via a single optical fiber. The eleventh optical switch communication module 53 is connected to the third switching node communication module 83 of the third switching node 73 via a single optical fiber. The twelfth optical switch communication module 54 is connected to the fourth switching node communication module 84 of the fourth switching node 74 via a single optical fiber, and so on.

[0048] There are many ways to implement the optical switch communication module and the switching node communication module. Specifically, the communication light transmitted between the optical switch communication module and the switching node communication module includes a data optical signal and a management optical signal, wherein the data optical signal is an optical signal that transmits information / data in a single-fiber bidirectional transmission system, and the management optical signal is an optical signal that transmits management and control information in a single-fiber bidirectional transmission system. The wavelength of the data optical signal and the wavelength of the management optical signal can be the same or different; therefore, the fusion of the data optical signal and the management optical signal can be achieved through multiplexing technology, such as multiplexing wavelength division multiplexing technology and non-wavelength division bidirectional signal separation technology, or multiplexing wavelength division multiplexing technology and subcarrier modulation technology, or multiplexing subcarrier modulation technology and non-wavelength division bidirectional signal separation technology; wherein the subcarrier modulation technology can be a transceiver subcarrier modulation technology or a technology in which the communication node embeds the transmit signal at a low frequency and the subcarrier receives the signal. The following is combined with Figures 3 to 6 The specific structures of the optical switch communication module and the switching node communication module under various implementation methods are introduced.

[0049] Third embodiment:

[0050] See also Figure 3 This embodiment multiplexes wavelength division multiplexing (WDM) technology with non-WDM bidirectional signal separation technology. The communication light transmitted between the optical switch communication module 100 and the switching node communication module 110 includes both a data optical signal and a management optical signal. In this embodiment, the wavelengths of the data optical signal and the management optical signal are different. For example, the wavelength of the management optical signal is λ11, while the wavelength of the data optical signal is λ12. Therefore, this method uses WDM to transmit both the data optical signal and the management optical signal within a single optical fiber.

[0051] Specifically, the switching node communication module 110 loads management information, such as addresses and service requirements, into a management optical signal. The signal is then merged into the optical fiber via the second wavelength division multiplexer 111. The optical switch communication module 100 extracts the management optical signal from the optical fiber via the first wavelength division multiplexer 101 and demodulates it to obtain the management information, thereby enabling the exchange of management control information between the switching node and the optical switch. Preferably, all management optical signals use the same optical wavelength to simplify system design.

[0052] The optical switch communication module 100 is provided with a first wavelength division multiplexer 101, a first circulator 102, a first management optical signal transmitting module 103 and a first management optical signal receiving module 104, wherein the first wavelength division multiplexer 101 can receive the communication light transmitted by the switching node communication module 110 and send the received communication light to the first circulator 102.

[0053] Since the first wavelength division multiplexer 101 can separate optical signals of different wavelengths, it can separate the data optical signal and the management optical signal according to the wavelength. The data optical signal will be transmitted to the corresponding optical port of the optical line switching array, while the management optical signal will be transmitted to the first circulator 102. The first circulator 102 can send the received management optical signal to the first management optical signal receiving module 104. The first management optical signal receiving module 104 performs photoelectric conversion and demodulation on the received management optical signal to obtain an electrical signal, and then parses the management and control requirements for the optical line or the response results to the relevant requirements from the electrical signal. Figure 3 The dotted line in represents the transmission route of the management optical signal.

[0054] If the optical switch communication module 100 needs to send a management optical signal, the management optical signal is generated by the first management optical signal transmitting module 103 through electro-optical conversion. The generated management optical signal is an optical signal carrying optical line management, control demand information or a response result to the relevant demand, and is transmitted to the first wavelength division multiplexer 101 through the first circulator 102. The first wavelength division multiplexer 101 transmits the data optical signal and the management optical signal to the switching node communication module 110 in a wavelength division multiplexing manner.

[0055] Switching node communication module 110 includes a second wavelength division multiplexer 111, a second circulator 112, and a third circulator 113. Second wavelength division multiplexer 111 separates management optical signals from data optical signals by wavelength, transmits the data optical signals to second circulator 112, and transmits the management optical signals to third circulator 113. Second circulator 112 can transmit data optical signals to first data optical signal receiving module 115 and receive data optical signals from first data optical signal transmitting module 114. Third circulator 113 can transmit management optical signals to second management optical signal receiving module 117 and receive management optical signals from second management optical signal transmitting module 116.

[0056] If the switching node communication module 110 needs to send a management optical signal, the management optical signal is generated by the second management optical signal transmitting module 116 through electro-optical conversion, and is transmitted to the second wavelength division multiplexer 111 through the third circulator 113. The second wavelength division multiplexer 111 transmits the data optical signal and the management optical signal to the optical switch communication module 100 in a wavelength division multiplexing manner.

[0057] Fourth embodiment:

[0058] See also Figure 4This embodiment multiplexes wavelength division multiplexing (WDM) and wavelength division multiplexing (WDM) technologies, employing two-stage WDM. Therefore, the communication light transmitted between the optical switch communication module 200 and the switching node communication module 210 can include three different wavelengths. For example, the management optical signal has wavelengths of λ21 and λ22, while the data optical signal has a wavelength of λ23. Therefore, this approach uses WDM to transmit both the data optical signal and the management optical signal within a single optical fiber.

[0059] Specifically, the optical switch communication module 200 is provided with a third wavelength division multiplexer 201, a fourth wavelength division multiplexer 202, a third management optical signal transmitting module 203 and a third management optical signal receiving module 204, wherein the third wavelength division multiplexer 201 can receive the communication light transmitted by the switching node communication module 210 and send the received communication light to the fourth wavelength division multiplexer 202.

[0060] Since the third wavelength division multiplexer 201 can separate optical signals of different wavelengths, it can separate the data optical signal and the management optical signal according to wavelength. The data optical signal with a wavelength of λ23 will be transmitted to the optical port corresponding to the optical line switching array, while the management optical signals with wavelengths of λ21 and λ22 will be transmitted to the fourth wavelength division multiplexer 202. The fourth wavelength division multiplexer 202 can send the received management optical signal to the third management optical signal receiving module 204. The third management optical signal receiving module 204 performs photoelectric conversion and demodulation on the received management optical signal to obtain an electrical signal, and then parses the electrical signal to obtain the management and control requirements for the optical line or the response results to the relevant requirements.

[0061] If the optical switch communication module 200 needs to send a management optical signal, the third management optical signal transmitting module 203 generates a management optical signal through electro-optical conversion. The generated management optical signal is an optical signal carrying optical line management, control demand information or a response result to the relevant demand, and is transmitted to the third wavelength division multiplexer 201 through the fourth wavelength division multiplexer 202. The third wavelength division multiplexer 201 transmits the data optical signal and the management optical signal to the switching node communication module 210 in a wavelength division multiplexing manner.

[0062] Switching node communication module 210 includes a fifth wavelength division multiplexer 211, a fourth circulator 212, and a sixth wavelength division multiplexer 213. Fifth wavelength division multiplexer 211 separates management optical signals from data optical signals by wavelength, transmits the data optical signal with a wavelength of λ23 to fourth circulator 212, and transmits the management optical signal to sixth wavelength division multiplexer 213. Fourth circulator 212 can transmit the data optical signal to second data optical signal receiving module 215 and receive the data optical signal from second data optical signal transmitting module 214. Sixth wavelength division multiplexer 213 can transmit the management optical signal to fourth management optical signal receiving module 217 and receive the management optical signal from fourth management optical signal transmitting module 216.

[0063] If the switching node communication module 210 needs to send a management optical signal, the management optical signal is generated by the fourth management optical signal transmitting module 216 through electro-optical conversion, and is transmitted to the fifth wavelength division multiplexer 211 through the sixth wavelength division multiplexer 213. The fifth wavelength division multiplexer 211 transmits the data optical signal and the management optical signal to the optical switch communication module 200 in a wavelength division multiplexing manner.

[0064] It should be noted that in this embodiment, the wavelength of the management optical signal emitted by the third management optical signal transmitting module 203 is different from the wavelength of the management optical signal received by the third management optical signal receiving module 204, and the wavelength of the management optical signal emitted by the fourth management optical signal transmitting module 216 is different from the wavelength of the management optical signal received by the fourth management optical signal receiving module 217. However, the wavelength of the management optical signal emitted by the third management optical signal transmitting module 203 and the wavelength of the management optical signal received by the fourth management optical signal receiving module 217 are the same, for example, both are λ21, while the wavelength of the management optical signal emitted by the fourth management optical signal transmitting module 216 and the wavelength of the management optical signal received by the third management optical signal receiving module 204 are the same, for example, both are λ22. Compared to the first embodiment, this embodiment uses two different wavelengths to transmit management optical signals, that is, the wavelengths of the upstream management optical signal and the downstream management optical signal are different.

[0065] Fifth embodiment:

[0066] See also Figure 5This embodiment multiplexes subcarrier modulation technology with non-wavelength division bidirectional signal separation technology. The communication light transmitted between the optical switch communication module 300 and the switching node communication module 310 contains both a data optical signal and a management optical signal. The management optical signal and the data optical signal have the same wavelength. Therefore, the management optical signal is generated by modulating the low-speed management optical signal into the high-speed data optical signal using subcarrier modulation. The management optical signal is analyzed by extracting a certain power of the communication optical signal from the optical fiber and demodulating the management / control information through low-pass filtering. Another processing method is to directly embed the low-speed management optical signal into the code stream of the high-speed data optical signal. Although the wavelength range of the data optical signal and the management optical signal is the same, the modulation frequency of the management optical signal is much lower than that of the data optical signal. The signal modulation frequency of the data optical signal is generally in the range of several gigabits to hundreds of gigabits, while the signal modulation frequency of the management optical signal is below several megabits. The modulation frequency of the management optical signal is more than a thousand times lower than that of the data optical signal. At the same time, the low-frequency modulation depth of the management optical signal is generally around 10% to 20%. Therefore, the management optical signal can be embedded in the data optical signal through optical signal modulation, and the management optical signal can be separated from the data optical signal through demodulation. The advantage of using the same wavelength for the management optical signal and the data optical signal is that it saves optical wavelength channels.

[0067] Figure 5 In the optical switch communication module 300, there is a first optical splitter 301, a fifth circulator 302, and a sixth circulator 303. The first optical splitter 301 is used to split the optical signal in the optical fiber by power. To ensure an appropriate bit error rate for both signal and control, the management optical signal is preferably split by approximately 10%, while the data optical signal is preferably split by approximately 90%. The specific splitting ratio can be determined based on the acceptable bit error rate of the system. The first optical splitter 301 can be implemented using fused taper technology, planar lightguide (PLC) technology, or optically coated film technology.

[0068] The first optical splitter 301 splits the received communication light according to a pre-set splitting ratio. The management optical signal portion is transmitted to the first management optical signal demodulation module 305 for demodulation, thereby demodulating the communication light to produce the management optical signal. The data optical signal portion is transmitted to the fifth circulator 302, which transmits the communication light to the sixth circulator 303 and then to the low-frequency signal suppression module 304. In this embodiment, the low-frequency signal suppression module 304 is an active optical filter. It can use an optical amplifier operating in APC mode, such as an EDFA or SOA, to achieve upward leveling of the optical signal power. Alternatively, it can use the power detection and attenuation functions of a dynamic power equalizer to achieve downward leveling of the optical signal power, thereby filtering out the low-frequency signal (management optical signal) from the low-frequency modulated optical pulse signal, generating a "clean" data optical signal, which facilitates the modulation and generation of the management optical signal at the next-stage port of the optical switch. Therefore, the low-frequency signal suppression module 304 can filter out the low-frequency management optical signal, retain the data optical signal, and transmit it to the corresponding optical port of the optical line switching array.

[0069] If communication light needs to be output through the optical switch communication module 300, the data optical signal needs to be output to the sixth circulator 303 through the low-frequency signal suppression module 304. The data optical signal incident from the low-frequency signal suppression module 304 can only pass through the sixth circulator 303 in one direction and be output to the first management optical signal modulation module 306. The first management optical signal modulation module 306 modulates the management optical signal onto the data optical signal to obtain communication light containing the data optical signal and the management optical signal, and outputs the communication light to the fifth circulator 302. Finally, the fifth circulator 302 outputs it to the switching node communication module 310 through the first optical splitter 301.

[0070] The switching node communication module 210 is provided with a seventh circulator 311 and a second optical splitter 312. The seventh circulator 311 transmits the communication light to the second optical splitter 312. The second optical splitter 312 can output the communication light to the third data optical signal receiving module 313 and the second management optical signal demodulation module 314. The second management optical signal demodulation module 314 obtains the management optical signal by demodulating the communication light.

[0071] When the switching node communication module 310 needs to output communication light, the third data optical signal transmitting module 316 generates a data optical signal and outputs it to the second management optical signal modulation module 315. The second management optical signal modulation module 315 modulates the management optical signal onto the data optical signal to form communication light, and transmits the communication light to the seventh circulator 311, and then transmits it to the first optical splitter 301 via the seventh circulator 311.

[0072] Sixth embodiment:

[0073] See also Figure 6This embodiment multiplexes subcarrier modulation technology and wavelength division multiplexing technology, and the management optical signal has two wavelengths, namely λ41 and λ42, while the wavelength of the data optical signal is the same as the wavelength of one of the management optical signals, both of which are λ41.

[0074] The optical switch communication module 400 includes a seventh wavelength division multiplexer 401, an eighth circulator 402, and a ninth circulator 403. The seventh wavelength division multiplexer 401 receives communication light transmitted by the switching node communication module 410 and outputs the communication light with a wavelength of λ41 to the eighth circulator 402. The eighth circulator 402 splits the light according to a preset splitting ratio. The management optical signal is output to the third optical splitter 405, which then outputs it to the third management optical signal demodulation module 406 for demodulation to obtain a management optical signal. The data optical signal is output to the ninth circulator 403, which then outputs it to the low-frequency signal suppression module 404. The low-frequency signal suppression module 404 filters out the low-frequency management optical signal, thereby obtaining a pure data optical signal and outputting it to the corresponding optical port of the optical line switching array. Furthermore, the fifth management optical signal transmitting module 407 can output a management optical signal with a wavelength of λ42, which is transmitted by the seventh wavelength division multiplexer 401 to the switching node communication module 410.

[0075] When the optical switch communication module 400 needs to output communication light, the data optical signal with a wavelength of λ41 from the optical line switching array passes through the low-frequency signal suppression module 404 and the ninth circulator 403 in sequence, and is output to the eighth circulator 402, and is output to the switching node communication module 410 through the seventh wavelength division multiplexer 401.

[0076] The switching node communication module 410 is provided with an eighth wavelength division multiplexer 411 and a tenth circulator 413. The eighth wavelength division multiplexer 411 outputs the management optical signal with a wavelength of λ42 to the fifth management optical signal receiving module 412, and the fifth management optical signal receiving module 412 parses the management optical signal with a wavelength of λ42.

[0077] The eighth wavelength division multiplexer 411 transmits the communication light with wavelength λ41 to the tenth circulator 413 . The tenth circulator 413 outputs the communication light to the fourth data optical signal receiving module 416 , which processes the data optical signal.

[0078] When the switching node communication module 410 needs to output communication light, the fourth data optical signal transmitting module 415 generates a data optical signal and outputs it to the third management optical signal modulation module 414. The third management optical signal modulation module 414 modulates the management optical signal onto the data optical signal to form communication light, and transmits the communication light to the tenth circulator 413, and finally transmits it to the optical switch communication module 400 via the eighth wavelength division multiplexer 411.

[0079] In this embodiment, the transmission and reception of management optical signals between the switching node communication module 410 and the optical switch communication module 400 are divided into two situations. The first situation is that the fifth management optical signal receiving module 412 in the switching node communication module 410 receives the management optical signal transmitted by the fifth management optical signal transmitting module 407 in the optical switch communication module 400. The wavelength of this management optical signal is different from the wavelength of the data optical signal. The second situation is that the third management optical signal demodulation module 406 in the optical switch communication module 400 receives the management optical signal modulated by the third management optical signal modulation module 414 in the switching node communication module 410 based on the data optical signal. In this case, the wavelength of the management optical signal is the same as the wavelength of the data optical signal. Therefore, it is necessary to add a low-frequency signal suppression module 404 to the optical switch communication module 400 to suppress / filter out the management optical signal.

[0080] It can be seen that the all-optical line switching system based on the optical switch network can realize bidirectional communication of data optical signals and management optical signals through a single optical fiber, which can improve the performance of the all-optical line switching system. There is no need to set up a service identification module. The fusion and separation of management optical signals and data optical signals are realized through wavelength division multiplexing or modulation. The all-optical line switching system has a simple structure and low production cost.

[0081] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An all-optical line switching system based on an optical switch network, comprising at least one optical switch having two or more optical switch communication modules; It is characterized by ； The optical switch adopts a single-fiber bidirectional transmission mechanism and is internally provided with an optical line switching matrix of M×N ports or any-port-to-any-port, wherein the optical line switching matrix includes multiple optical ports, and one of the optical ports is connected to one of the optical switch communication modules; Each of the optical switch communication modules is connected to an optical switch communication module of another optical switch or an external switching node communication module. The optical signal transmitted between the optical switch communication module and the optical switch communication module of the other optical switch or the switching node communication module is a communication light including a data optical signal and a management optical signal. The communication light is formed by low-frequency modulating the management optical signal and superimposing it on the data optical signal and / or by wavelength division multiplexing the management optical signal and the data optical signal. After receiving the communication light, the optical switch communication module separates the data optical signal from the management optical signal and transmits the data optical signal to the corresponding optical port. The management optical signal is used to change the transmission line of the data optical signal of the optical line switching matrix.

2. The all-optical line switching system based on an optical switch network according to claim 1, characterized in that: The wavelength of the data optical signal is different from the wavelength of the management optical signal; The optical switch communication module is provided with a first wavelength division multiplexer and a first circulator, wherein the first wavelength division multiplexer is used to separate the data optical signal and the management optical signal according to wavelength, and output the separated management optical signal to the first circulator; The first circulator receives the management optical signal output by the first management optical signal transmitting module, and outputs the management optical signal to the first management optical signal receiving module.

3. The all-optical line switching system based on an optical switch network according to claim 2, characterized in that: The switching node communication module has a second wavelength division multiplexer, and the second wavelength division multiplexer and the second circulator bidirectionally transmit data optical signals, and the second wavelength division multiplexer and the third circulator bidirectionally transmit management optical signals; The first wavelength division multiplexer and the second wavelength division multiplexer realize bidirectional transmission of the communication light through a single optical fiber.

4. The all-optical line switching system based on an optical switch network according to claim 1, characterized in that: The optical switch communication module is provided with a third wavelength division multiplexer and a fourth wavelength division multiplexer, the third wavelength division multiplexer is used to separate the data optical signal and the management optical signal according to wavelength, and output the separated management optical signal to the fourth wavelength division multiplexer; The fourth wavelength division multiplexer receives the management optical signal output by the third management optical signal transmitting module, and outputs the management optical signal transmitted from the third wavelength division multiplexer to the fourth wavelength division multiplexer to the third management optical signal receiving module.

5. The all-optical line switching system based on an optical switch network according to claim 4, characterized in that: The switching node communication module has a fifth wavelength division multiplexer, wherein the fifth wavelength division multiplexer and the fourth circulator bidirectionally transmit data optical signals, and the fifth wavelength division multiplexer and the sixth wavelength division multiplexer bidirectionally transmit management optical signals; The sixth wavelength division multiplexer receives the management optical signal output by the fourth management optical signal transmitting module, and outputs the management optical signal transmitted from the fifth wavelength division multiplexer to the sixth wavelength division multiplexer to the fourth management optical signal receiving module.

6. The all-optical line switching system based on an optical switch network according to claim 5, characterized in that: The wavelength of the management optical signal transmitted by the third management optical signal transmitting module is different from the wavelength of the management optical signal received by the third management optical signal receiving module; The wavelength of the management optical signal transmitted by the fourth management optical signal transmitting module is different from the wavelength of the management optical signal received by the fourth management optical signal receiving module; The wavelength of the management optical signal transmitted by the third management optical signal transmitting module is the same as the wavelength of the management optical signal received by the fourth management optical signal receiving module; The wavelength of the management optical signal transmitted by the fourth management optical signal transmitting module is the same as the wavelength of the management optical signal received by the third management optical signal receiving module.

7. The all-optical line switching system based on an optical switch network according to claim 1, characterized in that: The wavelength of the data optical signal is the same as the wavelength of the management optical signal; The optical switch communication module is provided with a first optical splitter, a fifth circulator and a sixth circulator. The first optical splitter splits the communication light according to a preset ratio and outputs a part of the communication light to the first management optical signal demodulation module, and outputs the other part of the communication light to the fifth circulator. The fifth circulator receives the management optical signal output by the first management optical signal modulation module, and the fifth circulator outputs the communication optical signal to the sixth circulator.

8. The all-optical line switching system based on an optical switch network according to claim 7, characterized in that: The switching node communication module comprises a seventh circulator and a second optical splitter, wherein the seventh circulator outputs communication light to the second optical splitter, and the second optical splitter outputs communication optical signals to the third data optical signal receiving module and the second management optical signal demodulation module; The seventh circulator also receives the communication optical signal output by the second management optical signal modulation module.

9. The all-optical line switching system based on an optical switch network according to claim 1, characterized in that: The optical switch communication module is provided with a seventh wavelength division multiplexer, an eighth circulator, a ninth circulator and a third optical splitter, the seventh wavelength division multiplexer and the eighth circulator bidirectionally transmit the communication light, and the seventh wavelength division multiplexer receives the management optical signal output by the fifth management optical signal transmission module; The eighth circulator outputs the communication light to the third optical splitter, and the third optical splitter outputs the communication light to the third management optical signal demodulation module and the ninth circulator; The ninth circulator is also connected to the low-frequency signal suppression module.

10. The all-optical line switching system based on an optical switch network according to claim 9, characterized in that: The switching node communication module includes an eighth wavelength division multiplexer and a tenth circulator, wherein communication light is bidirectionally transmitted between the eighth wavelength division multiplexer and the tenth circulator, and the management optical signal received by the eighth wavelength division multiplexer is output to the fifth management optical signal receiving module; The tenth circulator outputs the data optical signal to the fourth data optical signal receiving module, and the tenth circulator also receives the communication optical signal output by the third management optical signal modulation module.

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