Communication device, sensing assembly and optical fiber communication system

Abstract

This application provides a communication device, a sensing component, and an optical fiber communication system, relating to the field of optical communication technology. The communication device uses a branch port on a wavelength division multiplexer connected to an optical monitoring device to output and receive optical signals. It can detect vibration information generated by the surrounding environment of the transmission optical fiber connected to the communication device through a sensor without replacing the wavelength division multiplexer, and without affecting the transmission of existing service optical signals. The communication device includes: a first wavelength division multiplexer, a first optical monitoring device, a sensor, and a signal transmission component; the sensor is connected to a first branch port of the signal transmission component, the first optical monitoring device is connected to a second branch port of the signal transmission component, a first common port of the signal transmission component is connected to a third branch port of the first wavelength division multiplexer, and a second common port of the first wavelength division multiplexer is connected to the transmission optical fiber.

Description

[0001] This application claims priority to Chinese Patent Application No. 202510154430.7, filed on February 10, 2025, entitled "Communication Equipment and Optical Fiber Communication System", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical communication technology, and in particular to a communication device, a sensing component, and an optical fiber communication system. Background Technology

[0003] Fiber optic communication systems use light as the carrier and optical fiber as the transmission medium for communication. A typical fiber optic communication system includes transmitting communication equipment, receiving communication equipment, and transmission optical fibers connecting the two devices. The transmitting communication equipment outputs an optical signal, which is transmitted through the transmission optical fiber to the receiving communication equipment. The receiving communication equipment then analyzes the received optical signal to achieve communication.

[0004] Currently, distributed fiber acoustic sensing (DAS) and distributed fiber vibration sensing (DVS) technologies are developing rapidly, and more and more fiber optic communication systems are incorporating sensors to detect the surrounding environment of the transmission fiber. Specifically, sensors are installed in either the receiving or transmitting communication equipment. These sensors output optical signals to the transmission fiber; the transmitted optical signals are coherent pulsed optical signals. The sensors receive and detect the optical signals, determining the vibration events caused by the surrounding environment on the transmission fiber. Specifically, the transmitted optical signal is scattered after transmission through the fiber, resulting in the detection optical signal. The reverse-transmitted optical signal is the detection optical signal, carrying information about the vibration events caused by the surrounding environment on the transmission fiber.

[0005] However, the number of branch ports of wavelength division multiplexers in existing communication equipment is limited, making it impossible to add a new branch port to connect sensor devices. Summary of the Invention

[0006] Embodiments of this application provide a communication device, a sensing component, and an optical fiber communication system. The communication device uses a branch port connected to an optical monitoring device on a wavelength division multiplexer to output and transmit optical signals and receive and detect optical signals. Without replacing the wavelength division multiplexer in the communication device, the device can detect the vibration information generated by the surrounding environment of the transmission optical fiber connected to the communication device on the transmission optical fiber through a sensor device, without affecting the transmission of existing service optical signals.

[0007] In a first aspect, a communication device is provided, comprising: a first wavelength division multiplexer, a first optical monitoring device, a sensor, and a signal transmission component; the signal transmission component includes a first common port, a first branch port, and a second branch port, wherein the wavelength range of the optical signal transmitted through the first branch port does not overlap with the wavelength range of the optical signal transmitted through the second branch port, the first common port is connected to the first branch port, and the first common port is connected to the second branch port; the sensor is connected to the first branch port of the signal transmission component, the first optical monitoring device is connected to the second branch port of the signal transmission component, the first common port of the signal transmission component is connected to the third branch port of the first wavelength division multiplexer, and the second common port of the first wavelength division multiplexer is connected to a transmission optical fiber. In this communication device, the third branch port of the first wavelength division multiplexer is connected to the sensor device through a signal transmission component, and the third branch port of the first wavelength division multiplexer is also connected to the first optical monitoring device through the signal transmission component. It can be seen that the communication device uses the third branch port of the first wavelength division multiplexer to output the transmit optical signal generated by the sensor device and receive the detection optical signal transmitted to the sensor device. The communication device can detect the vibration information of the surrounding environment of the transmission optical fiber connected to the communication device on the transmission optical fiber without replacing the first wavelength division multiplexer, and does not affect the signal transmission of the first optical monitoring device or the transmission of existing service optical signals.

[0008] Optionally, the wavelength of the optical signal transmitted by the sensor belongs to the first wavelength band; the first transmission port of the first optical monitoring device is connected to the second branch port, and the wavelength of the optical signal transmitted by the first transmission port belongs to the second wavelength band; the first and second wavelength bands do not overlap; the wavelength of the optical signal transmitted by the first branch port belongs to the first wavelength band, the wavelength of the optical signal transmitted by the second branch port belongs to the second wavelength band, and the wavelength of the optical signal transmitted by the third branch port belongs to the third wavelength band, which includes the first and second wavelength bands. In this optional method, based on the fact that the wavelength of the optical signal transmitted by the first branch port belongs to the first wavelength band, the wavelength of the optical signal transmitted by the sensor belongs to the first wavelength band, and the wavelength of the optical signal transmitted by the third branch port belongs to the third wavelength band, which includes the first and second wavelength bands, it can be seen that the optical signal output by the sensor can be transmitted to the first wavelength division multiplexer through the signal transmission component, and the optical signal received by the sensor can be transmitted to the sensor through the first wavelength division multiplexer and the signal transmission component. Based on the connection between the first transmission port and the second branch port of the first optical monitoring device, the wavelength of the optical signal transmitted by the first transmission port belongs to the second band, and the optical signal transmitted by the second branch port also belongs to the second band. It can be known that the optical signal with a wavelength belonging to the second band received by the first optical monitoring device is transmitted to the first optical monitoring device through the first wavelength division multiplexer and the signal transmission component, or the optical signal with a wavelength belonging to the second band output by the first optical monitoring device can be transmitted to the first wavelength division multiplexer through the signal transmission component.

[0009] Optionally, a sensor is used to output a transmitted optical signal, which is a coherent pulsed optical signal with a wavelength belonging to a first wavelength band; a signal transmission component is used to transmit the transmitted optical signal to a first wavelength division multiplexer; the first wavelength division multiplexer is used to transmit the transmitted optical signal to a transmission optical fiber; the first wavelength division multiplexer is also used to receive a detection optical signal transmitted to the first wavelength division multiplexer through the transmission optical fiber and transmit the detection optical signal to the signal transmission component; wherein, the transmitted optical signal is scattered after transmission through the transmission optical fiber to obtain the detection optical signal, and the wavelength of the detection optical signal belongs to the first wavelength band; the signal transmission component is also used to transmit the detection optical signal to the sensor; the sensor is also used to determine the vibration information of the surrounding environment of the transmission optical fiber on the transmission optical fiber based on the detection optical signal.

[0010] Optionally, the second transmission port of the first optical monitoring device is connected to the fourth branch port of the first wavelength division multiplexer; the wavelength of the optical signal transmitted through the second transmission port belongs to the fourth band, and the first and fourth bands do not overlap; the wavelength of the optical signal transmitted through the fourth branch port belongs to the fourth band. In this optional configuration, for example, if the first transmission port is an output port and the second transmission port is an input port, then the optical signal output by the first optical monitoring device with a wavelength belonging to the second band is transmitted to the first wavelength division multiplexer through the signal transmission component, and the optical signal received by the first optical monitoring device with a wavelength belonging to the fourth band can be directly transmitted to the first optical monitoring device through the first wavelength division multiplexer; or, for example, if the first transmission port is an input port and the second transmission port is an output port, then the optical signal received by the first optical monitoring device with a wavelength belonging to the second band is transmitted to the first optical monitoring device through the first wavelength division multiplexer and the signal transmission component, and the optical signal output by the first optical monitoring device with a wavelength belonging to the fourth band can be directly transmitted to the first wavelength division multiplexer.

[0011] Optionally, a first optical monitoring device is used to output a first monitoring optical signal to a signal transmission component. The first monitoring optical signal carries first overhead information of the communication device, and the wavelength of the first monitoring optical signal belongs to a second band. The signal transmission component is used to transmit the first monitoring optical signal to a first wavelength division multiplexer. The first wavelength division multiplexer is used to transmit the first monitoring optical signal to a transmission optical fiber. The first wavelength division multiplexer is also used to receive a second monitoring optical signal transmitted to the first wavelength division multiplexer through the transmission optical fiber, and transmit the second monitoring optical signal to the first optical monitoring device. The wavelength of the second monitoring optical signal belongs to a fourth band. The second monitoring optical signal carries second overhead information of other communication devices, and the other communication devices are connected to the communication device through the transmission optical fiber. The first optical monitoring device is also used to determine the second overhead information based on the second monitoring optical signal. In this optional method, the first transmission port is an output port and the second transmission port is an input port. The first monitoring optical signal output by the first optical monitoring device, whose wavelength belongs to the second band, is transmitted to the first wavelength division multiplexer through the signal transmission component. The second monitoring optical signal received by the first optical monitoring device, whose wavelength belongs to the fourth band, can be directly transmitted to the first optical monitoring device through the first wavelength division multiplexer.

[0012] Optionally, a first optical monitoring device is used to output a first monitoring optical signal to a first wavelength division multiplexer. The first monitoring optical signal carries first overhead information of the communication equipment, and the wavelength of the first monitoring optical signal belongs to the fourth band. The first wavelength division multiplexer is used to transmit the first monitoring optical signal to a transmission optical fiber. The first wavelength division multiplexer is also used to receive a second monitoring optical signal transmitted to the first wavelength division multiplexer through the transmission optical fiber, and transmit the second monitoring optical signal to a signal transmission component. The wavelength of the second monitoring optical signal belongs to the second band. The second monitoring optical signal carries second overhead information of other communication equipment, and the other communication equipment is connected to the communication equipment through the transmission optical fiber. The signal transmission component is also used to transmit the second monitoring optical signal to the first optical monitoring device. The first optical monitoring device is also used to determine the second overhead information based on the second monitoring optical signal. In this optional method, the first transmission port is the input port and the second transmission port is the output port. The second monitoring optical signal with a wavelength belonging to the second band received by the first optical monitoring device is transmitted to the first optical monitoring device through the first wavelength division multiplexer and the signal transmission component. The first monitoring optical signal with a wavelength belonging to the fourth band output by the first optical monitoring device can be directly transmitted to the first wavelength division multiplexer.

[0013] Optionally, a first optical monitoring device is used to output a third monitoring optical signal to a first wavelength division multiplexer. The third monitoring optical signal is a pulsed optical signal, and its wavelength belongs to the fourth band. The first wavelength division multiplexer is used to transmit the third monitoring optical signal to a transmission optical fiber. The first wavelength division multiplexer is also used to receive a fourth monitoring optical signal transmitted to it through the transmission optical fiber and transmit the fourth monitoring optical signal to the first optical monitoring device. The third monitoring optical signal is scattered after transmission through the transmission optical fiber to obtain the fourth monitoring optical signal, and its wavelength belongs to the fourth band. The first optical monitoring device is also used to determine the fault point information of the transmission optical fiber based on the fourth monitoring optical signal. In this optional mode, when the first transmission port is an input port and the second transmission port is an output port, the first optical monitoring device can also integrate the function of an optical time-domain reflectometer (OTDR). For example, the first optical monitoring device outputs a first monitoring optical signal with a wavelength belonging to the fourth band and a third monitoring optical signal with a wavelength belonging to the fourth band in a time-division manner. The first monitoring optical signal carries the first overhead information of the communication equipment, and the third monitoring optical signal is a pulsed optical signal. The third monitoring optical signal is transmitted through the transmission optical fiber and then scattered to obtain the fourth monitoring optical signal. The first optical monitoring device determines the fault point information of the transmission optical fiber based on the fourth monitoring optical signal.

[0014] Optionally, a first optical monitoring device is used to output a first monitoring optical signal to a signal transmission component. The first monitoring optical signal carries first overhead information of the communication equipment, and the wavelength of the first monitoring optical signal belongs to a second band. The signal transmission component is used to transmit the first monitoring optical signal to a first wavelength division multiplexer. The first wavelength division multiplexer is used to transmit the first monitoring optical signal to a transmission optical fiber. The first wavelength division multiplexer is also used to receive a second monitoring optical signal transmitted to the first wavelength division multiplexer via the transmission optical fiber, and transmit the second monitoring optical signal to the signal transmission component. The first monitoring optical signal and the second monitoring optical signal have different wavelengths, and the wavelength of the second monitoring optical signal belongs to the second band. The second monitoring optical signal carries second overhead information of other communication equipment, and the other communication equipment is connected to the communication equipment via the transmission optical fiber. The signal transmission component is also used to transmit the second monitoring optical signal to the first optical monitoring device. The first optical monitoring device is also used to determine the second overhead information based on the second monitoring optical signal. In this optional method, the second monitoring optical signal with a wavelength belonging to the second band received by the first optical monitoring device is transmitted to the first optical monitoring device through the first wavelength division multiplexer and the signal transmission component. The first monitoring optical signal with a wavelength belonging to the second band output by the first optical monitoring device can be transmitted to the first wavelength division multiplexer through the signal transmission component. The wavelengths of the first monitoring optical signal and the second monitoring optical signal are different. The first optical monitoring device includes, for example, a single-fiber bidirectional (BIDI) optical device. The second monitoring optical signal received by the first optical monitoring device and the first monitoring optical signal output by the first optical monitoring device are transmitted through the first transmission port.

[0015] Optionally, the first optical monitoring device is further configured to output a third monitoring optical signal to the signal transmission component. The third monitoring optical signal is a pulsed optical signal, and its wavelength belongs to the second band. The signal transmission component is configured to transmit the third monitoring optical signal to the first wavelength division multiplexer. The first wavelength division multiplexer is configured to transmit the third monitoring optical signal to the transmission optical fiber. The first wavelength division multiplexer is further configured to receive a fourth monitoring optical signal transmitted to it via the transmission optical fiber and transmit the fourth monitoring optical signal to the signal transmission component. The third monitoring optical signal is scattered after transmission through the transmission optical fiber to obtain the fourth monitoring optical signal, and its wavelength belongs to the second band. The signal transmission component is further configured to transmit the fourth monitoring optical signal to the first optical monitoring device. The first optical monitoring device is further configured to determine the fault point information of the transmission optical fiber based on the fourth monitoring optical signal. In this optional method, the fourth monitoring optical signal with a wavelength belonging to the second band received by the first optical monitoring device is transmitted to the first optical monitoring device through the first wavelength division multiplexer and the signal transmission component. The third monitoring optical signal with a wavelength belonging to the second band output by the first optical monitoring device can be transmitted to the first wavelength division multiplexer through the signal transmission component. The third monitoring optical signal is then scattered after being transmitted through the transmission optical fiber to obtain the fourth monitoring optical signal. The first optical monitoring device can determine the fault point information of the transmission optical fiber based on the fourth monitoring optical signal. The first optical monitoring device is an optical time-domain reflectometer (OTDR).

[0016] Optionally, the communication equipment also includes a second optical monitoring device, which is connected to the fourth branch port of the first wavelength division multiplexer; the wavelength of the optical signal transmitted by the second optical monitoring device belongs to the fourth band; the wavelength of the optical signal transmitted by the fourth branch port belongs to the fourth band.

[0017] Optionally, when the first optical monitoring device outputs a first monitoring optical signal and receives a second monitoring optical signal; the second optical monitoring device is further configured to output a third monitoring optical signal to the first wavelength division multiplexer, the third monitoring optical signal being a pulsed optical signal with a wavelength belonging to the fourth band; the first wavelength division multiplexer is configured to transmit the third monitoring optical signal to the transmission optical fiber; the first wavelength division multiplexer is further configured to receive a fourth monitoring optical signal transmitted to the first wavelength division multiplexer via the transmission optical fiber, and transmit the fourth monitoring optical signal to the second optical monitoring device; wherein, the third monitoring optical signal is scattered after transmission through the transmission optical fiber to obtain the fourth monitoring optical signal, and the wavelength of the fourth monitoring optical signal belongs to the fourth band; the second optical monitoring device is further configured to determine the fault point information of the transmission optical fiber based on the fourth monitoring optical signal. In this optional method, the first optical monitoring device may include, for example, a single-fiber bidirectional (BIDI) optical device, the second monitoring optical signal received by the first optical monitoring device and the first monitoring optical signal output by the first optical monitoring device are transmitted through a first transmission port, and the second optical monitoring device is an optical time-domain reflectometer (OTDR).

[0018] Optionally, when the first optical monitoring device outputs a third monitoring optical signal and receives a fourth monitoring optical signal; the second optical monitoring device is used to output a first monitoring optical signal to the first wavelength division multiplexer, the first monitoring optical signal carrying first overhead information of the communication equipment, and the wavelength of the first monitoring optical signal belonging to the fourth band; the first wavelength division multiplexer is used to transmit the first monitoring optical signal to the transmission optical fiber; the first wavelength division multiplexer is also used to receive a second monitoring optical signal transmitted to the first wavelength division multiplexer through the transmission optical fiber, and transmit the second monitoring optical signal to the second optical monitoring device; wherein, the wavelengths of the first monitoring optical signal and the second monitoring optical signal are different, and the wavelength of the second monitoring optical signal belongs to the fourth band; the second monitoring optical signal carries second overhead information of other communication equipment, and the other communication equipment is connected to the communication equipment through the transmission optical fiber; the second optical monitoring device is also used to determine the second overhead information based on the second monitoring optical signal. The second optical monitoring device includes, for example, a single-fiber bidirectional (BIDI) optical device. The second monitoring optical signal received by the second optical monitoring device and the first monitoring optical signal output by the second optical monitoring device are transmitted through a first transmission port. The first optical monitoring device is an optical time-domain reflectometer (OTDR).

[0019] Optionally, the signal transmission component is a second wavelength division multiplexer; or, the signal transmission component includes a beam splitter, a first filter, and a second filter; the common port of the beam splitter is connected to the first common port, the first beam splitting port of the beam splitter is connected to the first transmission port of the first filter, the second transmission port of the first filter is a first branch port, the second beam splitting port of the beam splitter is connected to the third transmission port of the second filter, the fourth transmission port of the second filter is a second branch port, and the passband wavelength range of the first filter does not overlap with the passband wavelength range of the second filter. In this optional configuration, when the signal transmission component is a second wavelength division multiplexer (WDM), the WDM has the characteristic that optical signals received at any branch port of the WDM can be output through the common port of the WDM, and optical signals received at the common port of the WDM can be output through any branch port of the WDM. The multiple branch ports of the WDM transmit optical signals with different wavelengths. Therefore, it can be determined that the wavelengths of the optical signals transmitted at the first branch port and the second branch port of the second WDM are different, and the first common port of the second WDM is connected to the first branch port, and the first common port of the second WDM is connected to the second branch port. When the signal transmission component includes a beam splitter, a first filter, and a second filter, based on the connection relationship between the beam splitter, the first filter, and the second filter, and the characteristic that the passband wavelength ranges of the first filter and the second filter do not overlap, it can be known that the wavelengths of the optical signals transmitted at the first branch port and the second branch port of the signal transmission component are different, and the first common port of the signal transmission component is connected to the first branch port, and the first common port of the signal transmission component is connected to the second branch port.

[0020] Optionally, the passband wavelength range of the first filter is the first band, and the passband wavelength range of the second filter is the second band.

[0021] Secondly, a sensing component is provided, which is disposed in a communication device including a first wavelength division multiplexer and a first optical monitoring device. The sensing component includes a sensor and a signal transmission component. The signal transmission component includes a first common port, a first branch port, and a second branch port. The wavelength range of the optical signal transmitted by the first branch port does not overlap with the wavelength range of the optical signal transmitted by the second branch port. The first common port is connected to the first branch port, and the first common port is connected to the second branch port. The sensor is connected to the first branch port of the signal transmission component, the second branch port of the signal transmission component is connected to the first optical monitoring device, the first common port of the signal transmission component is connected to the third branch port of the first wavelength division multiplexer, and the second common port of the first wavelength division multiplexer is connected to a transmission optical fiber.

[0022] Optionally, the wavelength of the optical signal transmitted by the sensor belongs to the first band; the first transmission port of the first optical monitoring device is connected to the second branch port, and the wavelength of the optical signal transmitted by the first transmission port belongs to the second band; the first band and the second band do not overlap; the wavelength of the optical signal transmitted by the first branch port belongs to the first band, the optical signal transmitted by the second branch port belongs to the second band, and the wavelength of the optical signal transmitted by the third branch port belongs to the third band, which includes the first band and the second band.

[0023] Optionally, the signal transmission component is a second wavelength division multiplexer; or, the signal transmission component includes a beam splitter, a first filter, and a second filter; the common port of the beam splitter is connected to the first common port, the first beam splitting port of the beam splitter is connected to the first transmission port of the first filter, the second transmission port of the first filter is a first branch port, the second beam splitting port of the beam splitter is connected to the third transmission port of the second filter, the fourth transmission port of the second filter is a second branch port, and the passband wavelength range of the first filter does not overlap with the passband wavelength range of the second filter.

[0024] Thirdly, an optical fiber communication system is provided, including a transmission optical fiber and at least one communication device as described in any of the first aspects above; the at least one communication device includes a first communication device and a second communication device; the first communication device and the second communication device are connected via the transmission optical fiber.

[0025] The technical effects of any possible implementation of the second or third aspect can be found in the technical effects of different implementations of the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of an optical fiber communication system provided for an embodiment of this application;

[0027] Figure 2 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0028] Figure 3 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0029] Figure 4 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0030] Figure 5 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0031] Figure 6 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0032] Figure 7 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0033] Figure 8 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0034] Figure 9 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0035] Figure 10 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0036] Figure 11 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0037] Figure 12 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0038] Figure 13 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0039] Figure 14 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0040] Figure 15 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0041] Figure 16 A schematic diagram of the structure of an optical fiber communication system provided in another embodiment of this application;

[0042] Figure 17 A schematic diagram of the structure of a communication device provided for an embodiment of this application;

[0043] Figure 18 A schematic diagram of the structure of a communication device provided in another embodiment of this application;

[0044] Figure 19 A schematic diagram of the structure of a communication device provided in another embodiment of this application;

[0045] Figure 20 A schematic diagram of the structure of a communication device provided in another embodiment of this application;

[0046] Figure 21 A schematic diagram of the structure of a communication device provided in another embodiment of this application;

[0047] Figure 22This is a schematic diagram of the structure of a communication device provided in another embodiment of this application. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0053] Reference Figure 1As shown in the diagram, an embodiment of this application provides a structural schematic of an optical fiber communication system 100. The optical fiber communication system 100 includes a communication device 10, a communication device 20, and a transmission optical fiber 30 connecting the communication device 10 and the communication device 20. The communication device 10 is also referred to as the transmitting end communication device, and the communication device 20 is also referred to as the receiving end communication device. The communication device 10 outputs an optical signal, which is transmitted to the communication device 20 through the transmission optical fiber 30. The communication device 20 analyzes the received optical signal to achieve communication.

[0054] Reference Figure 2 As shown in the embodiments of this application, a schematic diagram of the structure of communication device 10 and communication device 20 is provided. Communication device 10 includes a wavelength division multiplexer 11 and an optical monitoring device 12. The common port b1 of the wavelength division multiplexer 11 is connected to the transmission optical fiber 30. Branch port a1 of the wavelength division multiplexer 11 is used to receive the service optical signal o11. Branch port a2 of the wavelength division multiplexer 11 is connected to the input port of the optical monitoring device 12. Branch port a3 of the wavelength division multiplexer 11 is connected to the output port of the optical monitoring device 12. Communication device 20 includes a wavelength division multiplexer 21 and an optical monitoring device 22. The common port b2 of the wavelength division multiplexer 21 is connected to the transmission optical fiber 30. Branch port a5 of the wavelength division multiplexer 21 is used to output the service optical signal. Branch port a6 of the wavelength division multiplexer 21 is connected to the input port of the optical monitoring device 22. Branch port a7 of the wavelength division multiplexer 21 is connected to the output port of the optical monitoring device 22.

[0055] For example, an optical signal received at any branch port of a wavelength division multiplexer can be output through the common port of the wavelength division multiplexer, and an optical signal received at the common port of the wavelength division multiplexer can be output through any branch port of the wavelength division multiplexer. Typically, the optical signals transmitted at the multiple branch ports of a wavelength division multiplexer have different wavelengths.

[0056] exist Figure 2 In the communication device 10 shown, the optical monitoring device 12 is used to output a monitoring optical signal o12, which carries the overhead information K1 of the communication device 10.

[0057] Wavelength division multiplexer 11 receives service optical signal o11 through branch port a1 and monitoring optical signal o12 through branch port a3. It then combines the service optical signal o11 and the monitoring optical signal o12 to output a combined optical signal o10. The wavelength of the monitoring optical signal o12 is different from the wavelength of the service optical signal o11. The combined optical signal o10 is transmitted through transmission optical fiber 30 to wavelength division multiplexer 21 in communication equipment 20. The combined optical signal o10 includes both the service optical signal o11 and the monitoring optical signal o12.

[0058] exist Figure 2In the communication device 20 shown, wavelength division multiplexer 21 is used to receive multiplexed optical signal o10 through common port b2, output service optical signal o11 in multiplexed optical signal o10 through branch port a5, and transmit monitoring optical signal o12 in multiplexed optical signal o10 to optical monitoring device 22 through branch port a6.

[0059] The optical monitoring device 22 is used to determine the overhead information K1 of the communication device 10 based on the monitoring optical signal o12.

[0060] The optical monitoring device 22 is also used to output a monitoring optical signal o21, which carries overhead information K2 of the communication device 20. The wavelength of the monitoring optical signal o21 is different from that of the service optical signal o11, and the wavelength of the monitoring optical signal o21 is different from that of the monitoring optical signal o12.

[0061] The wavelength division multiplexer 21 is also used to receive the monitoring optical signal o21 through the branch port a7 and output the monitoring optical signal o21. The monitoring optical signal o21 is transmitted to the wavelength division multiplexer 11 in the communication equipment 10 through the transmission optical fiber 30.

[0062] exist Figure 2 In the communication device 10 shown, wavelength division multiplexer 11 is used to receive monitoring optical signal o21 through common port b1 and transmit monitoring optical signal o21 to optical monitoring device 12 through branch port a2.

[0063] The optical monitoring device 12 is used to determine the overhead information K2 of the communication device 20 based on the received monitoring optical signal o21.

[0064] For example, Figure 2 In the communication device 10 of the fiber optic communication system 100 shown, the wavelength of the optical signal transmitted at branch port a2 of wavelength division multiplexer 11 belongs to [λ1, λ2], and the wavelength of the optical signal transmitted at branch port a3 of wavelength division multiplexer 11 belongs to [λ3, λ4]. Optical monitoring device 12 receives optical signals of arbitrary wavelengths and outputs a monitoring optical signal o12 with a wavelength belonging to [λ3, λ4]. Specifically, optical monitoring device 12 receives a monitoring optical signal o21 with a wavelength belonging to [λ1, λ2]. Wherein, λ4 > λ3 > λ2 > λ1.

[0065] Figure 2 In the communication device 20 of the optical fiber communication system 100 shown, the wavelength of the optical signal transmitted at the branch port a7 of the wavelength division multiplexer 21 belongs to [λ1, λ2], and the wavelength of the optical signal transmitted at the branch port a6 of the wavelength division multiplexer 21 belongs to [λ3, λ4]. The optical monitoring device 22 receives optical signals of arbitrary wavelengths and outputs a monitoring optical signal o21 with a wavelength belonging to [λ1, λ2]. Specifically, the optical monitoring device 12 receives a monitoring optical signal o12 with a wavelength belonging to [λ3, λ4].

[0066] Currently, distributed fiber acoustic sensing (DAS) and distributed fiber vibration sensing (DVS) technologies are developing rapidly, and more and more fiber optic communication systems are incorporating sensors to detect the surrounding environment of the transmission fiber. Specifically, sensors are installed in communication device 10 or communication device 20. These sensors output a coherent pulsed optical signal to the transmission fiber 30. The sensors receive the detection optical signal and determine the vibration events caused by the surrounding environment on the transmission fiber 30 based on the detection optical signal. Specifically, the detection optical signal is obtained by scattering after transmission through the transmission fiber 30. Rayleigh scattering occurs during the transmission of the optical signal, leading to reverse transmission. This reverse-transmitted optical signal is the detection optical signal, which carries the vibration events caused by the surrounding environment on the transmission fiber 30.

[0067] However, in existing deployed networks, Figure 2 The wavelength division multiplexer 11 in the communication device 10 shown does not have any extra branch ports for connecting sensor devices. Figure 2 The wavelength division multiplexer 21 in the communication device 20 shown does not have any extra branch ports for connecting sensor devices.

[0068] In order to install sensor devices in communication equipment, refer to Figure 3 As shown, in one example, the fiber optic communication system 10 also includes a transmission fiber 40, which is located in the same optical cable as the transmission fiber 30. Figure 3 As shown, the communication device 10 also includes a sensor 13 connected to the transmission optical fiber 40. The sensor 13 is used to output a transmitted optical signal o13 to the transmission optical fiber 40. The transmitted optical signal o13 is a coherent pulsed optical signal. The sensor 13 is also used to receive a detection optical signal o13f. Based on the detection optical signal o13f, the sensor 13 determines the vibration event caused by the surrounding environment of the transmission optical fiber 40 on the transmission optical fiber 40, and then infers the vibration event caused by the surrounding environment of the transmission optical fiber 30 on the transmission optical fiber 30. Specifically, the transmitted optical signal o13 is scattered after being transmitted through the transmission optical fiber 40 to obtain the detection optical signal o13f. Rayleigh scattering occurs during the transmission of the transmitted optical signal o13 in the transmission optical fiber 40, and the reverse transmission occurs. The reverse transmission optical signal is the detection optical signal o13f, which carries the vibration event caused by the surrounding environment of the transmission optical fiber 40 on the transmission optical fiber 40.

[0069] For example, the laser in sensor 13 outputs laser light, which is split into a transmitted optical signal o13 and a reference optical signal after passing through a coupler in sensor 13. After receiving the detected optical signal o13f, sensor 13 coherently couples the reference optical signal with the detected optical signal o13f. The coherently coupled optical signal enters the photoelectric detection device in sensor 13 and is converted into an electrical signal. The signal processor in sensor 13 determines the vibration event generated by the surrounding environment of the transmission optical fiber 40 on the transmission optical fiber 40 based on the electrical signal. Among them, the detection device 13 based on DAS technology can determine the location of the vibration event, the presence or absence of the vibration event, and the intensity of the vibration event, and DAS can quantitatively determine the intensity of the vibration event; the detection device 13 based on DVS technology can determine the location of the vibration event, the presence or absence of the vibration event, and the intensity of the vibration event, but DVS can only qualitatively determine the intensity of the vibration event.

[0070] but, Figure 3 The sensor device 13 shown requires the use of the transmission optical fiber 40, which wastes valuable optical fiber resources. Furthermore, when the transmission optical fiber 40 and the transmission optical fiber 30 are not connected by the same cable, the sensor device 13 cannot infer the vibration events generated by the surrounding environment of the transmission optical fiber 30 on the transmission optical fiber 30 based on the vibration events generated by the surrounding environment of the transmission optical fiber 40.

[0071] In other embodiments, in order to install sensor devices in a communication device, reference is made to... Figure 4 As shown, Figure 2 The wavelength division multiplexer 11 in communication device 10 and the wavelength division multiplexer 21 in communication device 20 are replaced with wavelength division multiplexers that have more branch ports. For example Figure 4 The wavelength division multiplexer 11 shown is compared to Figure 2 The wavelength division multiplexer 11 shown also includes a branch port a4, which is connected to... Figure 3 The sensor 13 shown is connected. Figure 4 The wavelength division multiplexer 21 in the communication device 20 shown is compared to Figure 2 The wavelength division multiplexer 21 shown also includes a branch port a8, which is connected to... Figure 3 The sensor device 23 shown is connected.

[0072] exist Figure 4 In the communication device 10 shown, the optical monitoring device 12 is used to output a monitoring optical signal o12, which carries the overhead information K1 of the communication device 10. The sensor device 13 is used to output a transmitting optical signal o13, which is a coherent pulsed optical signal.

[0073] Wavelength division multiplexer 11 receives service optical signal o11 through branch port a1, monitoring optical signal o12 through branch port a3, and transmit optical signal o13 through branch port a4. It then combines the service optical signal o11, monitoring optical signal o12, and transmit optical signal o13 to output a combined optical signal o10. The wavelengths of the monitoring optical signal o12, transmit optical signal o13, and service optical signal o11 are all different. The combined optical signal o10 is transmitted via transmission optical fiber 30 to wavelength division multiplexer 21 in communication equipment 20.

[0074] Furthermore, the transmit optical signal o13 in the combined optical signal o10 is scattered after being transmitted through the transmission optical fiber 30 to obtain the detection optical signal o13f. Specifically, the transmit optical signal o13 undergoes Rayleigh scattering during transmission in the transmission optical fiber 30 and is then transmitted in the reverse direction. The optical signal transmitted in the reverse direction is the detection optical signal o13f. The wavelength division multiplexer 11 is also used to receive the detection optical signal o13f and transmit it to the sensor device 13 through the branch port a4. The sensor device 13 is also used to receive the detection optical signal o13f and determine the vibration events caused by the surrounding environment of the transmission optical fiber 30 near the communication device 10 on the transmission optical fiber 30 based on the detection optical signal o13f.

[0075] exist Figure 4 In the communication device 20 shown, wavelength division multiplexer 21 is used to receive multiplexed optical signal o10 through common port b2, output service optical signal o11 in multiplexed optical signal o10 through branch port a5, and transmit monitoring optical signal o12 in multiplexed optical signal o10 to optical monitoring device 22 through branch port a6.

[0076] The optical monitoring device 22 is used to determine the overhead information K1 of the communication device 10 based on the monitoring optical signal o12.

[0077] The optical monitoring device 22 is also used to output a monitoring optical signal o21, which carries overhead information K2 of the communication device 20. The sensor device 23 is used to output a transmit optical signal o22. The wavelengths of the service optical signal o11, the monitoring optical signal o12, the monitoring optical signal o21, the transmit optical signal o13, and the transmit optical signal o22 are all different.

[0078] The wavelength division multiplexer 21 is also used to receive the monitoring optical signal o21 through branch port a7 and the transmit optical signal o22 through branch port a8, and to combine the monitoring optical signal o21 and the transmit optical signal o22 to output the combined optical signal o20. The combined optical signal o20 is transmitted to the wavelength division multiplexer 11 in the communication device 10 through the transmission optical fiber 30.

[0079] Furthermore, the transmitted optical signal o22 in the combined optical signal o20 is scattered after being transmitted through the transmission optical fiber 30 to obtain the detection optical signal o22f. Specifically, the transmitted optical signal o22 undergoes Rayleigh scattering during transmission in the transmission optical fiber 30 and is then transmitted in the reverse direction; the reverse-transmitted optical signal is the detection optical signal o22f. The sensor device 23 is also used to receive the detection optical signal o22f and, based on the detection optical signal o22f, determine the vibration events generated by the surrounding environment of the portion of the transmission optical fiber 30 near the communication device 20 on the transmission optical fiber 30.

[0080] exist Figure 4 In the communication device 10 shown, wavelength division multiplexer 11 is used to receive multiplexed optical signal o20 through common port b1 and transmit the monitoring optical signal o21 in the multiplexed optical signal o20 to optical monitoring device 12 through branch port a2.

[0081] The optical monitoring device 12 is used to determine the overhead information K2 of the communication device 20 based on the received monitoring optical signal o21.

[0082] However, Figure 2 The wavelength division multiplexer with fewer branch ports shown is replaced with Figure 4 The wavelength division multiplexer shown has a large number of branch ports, which requires higher costs and more layout space, and the replacement process will cause interruption of service optical signals.

[0083] Therefore, embodiments of this application provide a communication device that uses a branch port on a wavelength division multiplexer connected to an optical monitoring device to output and transmit optical signals and receive and detect optical signals. This allows the device to detect vibration information generated by the surrounding environment of the transmission optical fiber connected to the communication device through sensors without replacing the wavelength division multiplexer in the communication device, and without affecting the transmission of existing service optical signals.

[0084] In the first embodiment, such as Figure 5 As shown, Figure 5 The present invention provides a schematic diagram of the structure of an optical fiber communication system 100, which includes a communication device 10, a communication device 20, and a transmission optical fiber 30 connecting the communication device 10 and the communication device 20.

[0085] like Figure 5 As shown, Figure 5The communication device 10 shown includes a wavelength division multiplexer 11, an optical monitoring device 12, a sensor device 13, and a signal transmission component. The signal transmission component includes a first common port, a first branch port, and a second branch port. The wavelength range of the optical signal transmitted through the first branch port does not overlap with the wavelength range of the optical signal transmitted through the second branch port. The first common port is connected to the first branch port, and the first common port is connected to the second branch port. "Does not overlap" means that the wavelength ranges of the optical signals transmitted through the first branch port and the second branch port do not contain the same wavelength. For example, assuming the wavelength range of the optical signal transmitted at the first branch port is [λa, λb], and the wavelength of the optical signal transmitted at the second branch port is [λc, λd], the first common port of the signal transmission component is connected to the first branch port. This means that the portion of the optical signal with wavelengths belonging to [λa, λb] received at the first common port can be output through the first branch port, and the portion of the optical signal with wavelengths belonging to [λc, λd] received at the first common port can be output through the second branch port. The optical signal with wavelengths belonging to [λa, λb] received at the first branch port can be output through the first common port, and the optical signal with wavelengths belonging to [λc, λd] received at the second branch port can be output through the first common port.

[0086] Specifically, Figure 5 The signal transmission component in the communication device 10 shown is a wavelength division multiplexer 14. The wavelength division multiplexer 14 includes a common port c1, branch ports d1 and d2. Specifically, common port c1 is a first common port, branch port d1 is a first branch port, and branch port d2 is a second branch port. The wavelength division multiplexer 14 has the characteristic that optical signals received at any branch port can be output through the common port c1, and optical signals received at the common port c1 can be output through any branch port. The wavelengths of the optical signals transmitted through the multiple branch ports of the wavelength division multiplexer 14 are different. Therefore, it can be determined that the wavelengths of the optical signals transmitted at branch ports d1 and d2 are different. The common port c1 of the wavelength division multiplexer 14 is connected to branch port d1, and the common port c1 of the wavelength division multiplexer 14 is connected to branch port d2.

[0087] exist Figure 5 In the communication device 10 shown, wavelength division multiplexer 11 is also referred to as first wavelength division multiplexer, optical monitoring device 12 is also referred to as first optical monitoring device, and wavelength division multiplexer 14 is also referred to as second wavelength division multiplexer.

[0088] exist Figure 5In the communication device 10 shown, sensor 13 is connected to branch port d1 of wavelength division multiplexer 14, optical monitoring device 12 is connected to branch port d2 of wavelength division multiplexer 14, common port c1 of wavelength division multiplexer 14 is connected to branch port a2 of wavelength division multiplexer 11, and common port b1 of wavelength division multiplexer 11 is connected to transmission optical fiber 30. Branch port a2 is also referred to as the third branch port, and common port b1 is also referred to as the second common port.

[0089] Specifically, in Figure 5 In the communication device 10 shown, the second transmission port of the optical monitoring device 12 is connected to the branch port a3 of the wavelength division multiplexer 11, and the first transmission port of the optical monitoring device 12 is connected to the branch port d2 of the wavelength division multiplexer 14. The branch port a1 of the wavelength division multiplexer 11 is used to receive the service optical signal o11. The branch port a3 is also called the fourth branch port. The second transmission port of the optical monitoring device 12 is also called the transmit port (Tx), and the first transmission port of the optical monitoring device 12 is also called the receive port (Rx).

[0090] Figure 5 The communication device 20 shown includes a wavelength division multiplexer 21 and an optical monitoring device 22. The common port b2 of the wavelength division multiplexer 21 is connected to the transmission optical fiber 30. The branch port a5 of the wavelength division multiplexer 21 is used to output the service optical signal o11. The branch port a6 of the wavelength division multiplexer 21 is connected to the receiving port (Rx) of the optical monitoring device 22. The branch port a7 of the wavelength division multiplexer 21 is connected to the transmitting port (Tx) of the optical monitoring device 22.

[0091] For example, in Figure 5In the communication device 10 shown, the wavelength of the optical signal transmitted by the sensor 13 belongs to the first band. Specifically, the wavelength of the transmitted optical signal o13 output by the sensor 13 belongs to the first band, and the wavelength of the detected optical signal o13f received by the sensor 13 also belongs to the first band. Therefore, the wavelength of the optical signal transmitted by the branch port d1 connected to the sensor 13 in the wavelength division multiplexer 14 belongs to the first band. The wavelength of the optical signal transmitted by the first transmission port of the optical monitoring device 12 belongs to the second band. For example, the wavelength of the monitoring optical signal o21 received by the first transmission port of the optical monitoring device 12 belongs to the second band. The wavelength of the optical signal transmitted by the second transmission port of the optical monitoring device 12 belongs to the fourth band. For example, the wavelength of the monitoring optical signal o12 output by the second transmission port of the optical monitoring device 12 belongs to the fourth band. Therefore, the wavelength of the optical signal transmitted by the branch port d2 connected to the first transmission port of the optical monitoring device 12 in the wavelength division multiplexer 14 belongs to the second band. The wavelength of the optical signal transmitted at branch port a2 of wavelength division multiplexer 11 belongs to the third band. The third band includes the first and second bands. For example, the third band is [λ1, λ2], the second band is [λ5, λ6], and the first band is [λ7, λ8], where λ2 > λ8 > λ7 > λ6 > λ5 > λ1. Therefore, the wavelength of the optical signal transmitted at the common port c1 of wavelength division multiplexer 14, which is connected to branch port a2 of wavelength division multiplexer 11, includes the third band. The wavelength of the optical signal transmitted at branch port a3 of wavelength division multiplexer 11 belongs to the fourth band. The first and second bands do not overlap, the first and fourth bands do not overlap, and the second and fourth bands do not overlap. For example, the fourth band is [λ3, λ4], where λ2 > λ8 > λ7 > λ6 > λ5 > λ1 > λ4 > λ3.

[0092] In other embodiments, the order may be λ4>λ3>λ2>λ8>λ7>λ6>λ5>λ1. The embodiments of this application do not limit this to the following.

[0093] exist Figure 5 In the communication device 20 shown, the wavelength of the monitoring optical signal o21 output by the optical monitoring device 22 belongs to the second band, the wavelength of the monitoring optical signal o12 received by the optical monitoring device 22 belongs to the fourth band, the wavelength of the optical signal transmitted by the branch port a7 of the wavelength division multiplexer 21 belongs to the third band, and the wavelength of the optical signal transmitted by the branch port a6 of the wavelength division multiplexer 21 belongs to the fourth band.

[0094] exist Figure 5 In the communication device 10 shown, sensor 13 is used to output a transmitted optical signal o13, which is a coherent pulsed optical signal; wavelength division multiplexer 14 is used to transmit the transmitted optical signal o13 to wavelength division multiplexer 11.

[0095] The optical monitoring device 12 is used to output a monitoring optical signal o12 to the wavelength division multiplexer 11. The monitoring optical signal o12 carries the overhead information K1 of the communication device 10. The monitoring optical signal o12 is also referred to as the first monitoring optical signal, and the overhead information K1 is also referred to as the first overhead information. The monitoring optical signal o12 is a continuous optical signal.

[0096] The wavelength division multiplexer 11 receives the service optical signal o11 through branch port a1, the transmit optical signal o13 through branch port a2, and the monitoring optical signal o12 through branch port a3. It then combines the service optical signal o11, the transmit optical signal o13, and the monitoring optical signal o12 to output a combined optical signal o10. The wavelengths of the monitoring optical signal o12, the transmit optical signal o13, and the service optical signal o11 are all different. The combined optical signal o10 includes the service optical signal o11, the transmit optical signal o13, and the monitoring optical signal o12, meaning that the wavelength division multiplexer 11 transmits these signals to the transmission optical fiber 30.

[0097] The combined optical signal o10 is transmitted to the wavelength division multiplexer 21 in the communication device 20 through the transmission optical fiber 30. The transmit optical signal o13 in the combined optical signal o10 is scattered after being transmitted through the transmission optical fiber 30 to obtain the detection optical signal o13f. Specifically, the transmit optical signal o13 undergoes Rayleigh scattering during transmission in the transmission optical fiber 30 and is then transmitted in the reverse direction. The optical signal transmitted in the reverse direction is the detection optical signal o13f. The detection optical signal o13f carries the vibration events caused by the surrounding environment of the transmission optical fiber 30 on the transmission optical fiber 30.

[0098] The wavelength division multiplexer 11 is also used to receive the detection optical signal o13f and transmit the detection optical signal o13f to the wavelength division multiplexer 14 through the branch port a2; the wavelength division multiplexer 14 is also used to transmit the detection optical signal o13f to the sensor device 13; the sensor device 13 is also used to receive the detection optical signal o13f and determine the vibration event of the surrounding environment of the transmission optical fiber 30 to the transmission optical fiber 30 based on the detection optical signal o13f.

[0099] exist Figure 5 In the communication device 20 shown, wavelength division multiplexer 21 is used to receive multiplexed optical signal o10 through common port b2, output service optical signal o11 in multiplexed optical signal o10 through branch port a5, and transmit monitoring optical signal o12 in multiplexed optical signal o10 to optical monitoring device 22 through branch port a6.

[0100] The optical monitoring device 22 is used to determine the overhead information K1 of the communication device 10 based on the monitoring optical signal o12.

[0101] The optical monitoring device 22 is also used to output a monitoring optical signal o21, which carries the overhead information K2 of the communication device 20. The monitoring optical signal o21 is a continuous optical signal. The wavelengths of the monitoring optical signal o21, the service optical signal o11, the monitoring optical signal o12, and the transmitted optical signal o13 are all different. The monitoring optical signal o21 is also referred to as the second monitoring optical signal, and the overhead information K2 is also referred to as the second overhead information.

[0102] The wavelength division multiplexer 21 is also used to receive the monitoring optical signal o21 through the branch port a7 and output the monitoring optical signal o21. The monitoring optical signal o21 is transmitted to the wavelength division multiplexer 11 in the communication equipment 10 through the transmission optical fiber 30.

[0103] exist Figure 5 In the communication device 10 shown, wavelength division multiplexer 11 is used to receive monitoring optical signal o21 through common port b1 and transmit monitoring optical signal o21 through branch port a2 to wavelength division multiplexer 14. Wavelength division multiplexer 14 is used to transmit monitoring optical signal o21 to optical monitoring device 12; optical monitoring device 12 is used to determine the overhead information K2 of communication device 20 based on the received monitoring optical signal o21.

[0104] For example, when the overhead information K1 includes the clock of the communication device 10 and the overhead information K2 includes the clock of the communication device 20, the optical monitoring device 12 is further configured to align the clock of the communication device 10 with the clock of the communication device 20 based on the overhead information K2 of the communication device 20 and the overhead information K1 of the communication device 10, and the optical monitoring device 22 is further configured to align the clock of the communication device 20 with the clock of the communication device 10 based on the overhead information K1 of the communication device 10 and the overhead information K2 of the communication device 20, thereby realizing the function of 1588 clock. However, since the monitoring optical signal o12 output by the optical monitoring device 12 is transmitted to the optical monitoring device 22 through wavelength division multiplexer 11, transmission optical fiber 30, and wavelength division multiplexer 21, while the monitoring optical signal o21 output by the optical monitoring device 22 is transmitted to the optical monitoring device 12 through wavelength division multiplexer 21, transmission optical fiber 30, wavelength division multiplexer 11, and wavelength division multiplexer 14, the transmission distance of the monitoring optical signal o12 and the transmission distance of the monitoring optical signal o21 have a large error. Therefore, the optical monitoring devices 12 and 22 can only realize the function of a low-precision 1588 clock, such as a 1588 clock function of tens of nanoseconds (ns).

[0105] In some embodiments, refer to Figure 5As shown, the optical monitoring device 12 is also used to output a monitoring optical signal o14 and receive a monitoring optical signal o14f. The pulse width of the monitoring optical signal o14 is greater than the pulse width of the transmitted optical signal o13. The wavelength of the monitoring optical signal o14f received by the second transmission port of the optical monitoring device 12 belongs to the fourth band, and the wavelength of the monitoring optical signal o14 output by the second transmission port of the optical monitoring device 12 also belongs to the fourth band. Specifically, the monitoring optical signal o14 is an intensity-modulated pulse optical signal, and the optical monitoring device 12 outputs both the monitoring optical signal o14 and the monitoring optical signal o12 to the wavelength division multiplexer 11 in a time-division multiplexing manner. The monitoring optical signal o14 is also referred to as the third monitoring optical signal, and the monitoring optical signal o14f is also referred to as the fourth monitoring optical signal.

[0106] For example, during the process of the optical monitoring device 12 outputting the monitoring optical signal o14, it does not affect the sensor device 13 outputting the transmitting optical signal o13 and receiving the detection optical signal o13f.

[0107] Specifically, during the process of the optical monitoring device 12 outputting the monitoring optical signal o14, the wavelength division multiplexer 11 receives the service optical signal o11 through branch port a1, receives the transmit optical signal o13 through branch port a2, and receives the monitoring optical signal o14 through branch port a3. It then combines the service optical signal o11, the transmit optical signal o13, and the monitoring optical signal o14 to output the combined optical signal o10. The combined optical signal o10 includes the service optical signal o11, the transmit optical signal o13, and the monitoring optical signal o14, meaning that the wavelength division multiplexer 11 transmits the service optical signal o11, the transmit optical signal o13, and the monitoring optical signal o14 to the transmission optical fiber 30.

[0108] Furthermore, the monitoring optical signal o14 in the combined optical signal o10 is scattered after transmission through the transmission optical fiber 30 to obtain the monitoring optical signal o14f. Specifically, the monitoring optical signal o14 undergoes Rayleigh scattering during transmission through the transmission optical fiber 30 and is then transmitted in the reverse direction. The transmitted optical signal is the monitoring optical signal o14f, which carries information about the fault points in the transmission optical fiber 30. For example, a fault point in the monitoring optical signal o14 will reflect the monitoring optical signal o14, causing the monitoring optical signal o14f to include multiple peaks. The information about the fault points in the transmission optical fiber 30 may include, for example, the location and loss of refractive index inhomogeneity, the location and loss of defects, the location and loss of breaks, the location and loss of joint couplings, etc.

[0109] The wavelength division multiplexer 11 is also used to receive the monitoring optical signal o14f and transmit the monitoring optical signal o14f to the optical monitoring device 12.

[0110] The optical monitoring device 12 is also used to determine information about the fault point of the transmission optical fiber 30 based on the monitoring optical signal o14f.

[0111] Among them, Figure 5 In the communication device 20 shown, wavelength division multiplexer 21 receives the multiplexed optical signal o10 through common port b2 and outputs the service optical signal o11 in the multiplexed optical signal o10 through branch port a5. Normally, the monitoring optical signal o14 in the multiplexed optical signal o10 is not continuously transmitted to wavelength division multiplexer 21. Although a portion of the monitoring optical signal o14 is transmitted to wavelength division multiplexer 21, this portion of the monitoring optical signal o14 is transmitted to optical monitoring device 22 through branch port a6 of wavelength division multiplexer 21, and optical monitoring device 22 does not process the monitoring optical signal o14.

[0112] exist Figure 5 When the optical monitoring device 12 outputs monitoring optical signal o14 and monitoring optical signal o12 in a time-division manner, the optical monitoring device 12 can realize the detection of fault points in the transmission optical fiber 30 and the transmission of overhead information K1. That is, the optical monitoring device 12 can integrate the function of an optical time-domain reflectometer (OTDR).

[0113] In the second embodiment, refer to Figure 6 As shown, compared to Figure 5 The fiber optic communication system 100 shown is... Figure 6 In the communication device 10 of the optical fiber communication system 100 shown, the second transmission port of the optical monitoring device 12 is connected to the branch port a3 of the wavelength division multiplexer 11, and the first transmission port of the optical monitoring device 12 is connected to the branch port d2 of the wavelength division multiplexer 14. The wavelength of the optical signal transmitted by the first transmission port of the optical monitoring device 12 belongs to the second band. For example, the wavelength of the monitoring optical signal o12 output by the first transmission port of the optical monitoring device 12 belongs to the second band. The wavelength of the optical signal transmitted by the second transmission port of the optical monitoring device 12 belongs to the fourth band. For example, the wavelength of the monitoring optical signal o21 received by the second transmission port of the optical monitoring device 12 belongs to the fourth band. The first transmission port of the optical monitoring device 12 is also called the transmitting port (Tx), and the second transmission port of the optical monitoring device 12 is also called the receiving port (Rx).

[0114] Figure 6 In the communication device 20 of the optical fiber communication system 100 shown, the receiving port (Rx) of the optical monitoring device 22 is connected to the branch port a7 of the wavelength division multiplexer 21, and the transmitting port (Tx) of the optical monitoring device 22 is connected to the branch port a6 of the wavelength division multiplexer 21. The wavelength of the monitoring optical signal o21 output by the optical monitoring device 22 belongs to the fourth band, and the wavelength of the monitoring optical signal o12 received by the optical monitoring device 22 belongs to the second band.

[0115] Compared to Figure 5 The communication device 10 shown, Figure 6In the communication device 10 shown, the wavelength of the monitoring optical signal o21 received by the second transmission port of the optical monitoring device 12 belongs to the fourth band, and the wavelength of the monitoring optical signal o12 output by the first transmission port of the optical monitoring device 12 belongs to the second band. Figure 6 In the communication device 20 shown, the wavelength of the monitoring optical signal o21 received by the optical monitoring device 22 belongs to the second band, and the wavelength of the monitoring optical signal o12 output by the optical monitoring device 22 belongs to the fourth band.

[0116] exist Figure 6 In the communication device 10 shown, sensor 13 is used to output a transmit optical signal o13; optical monitoring device 12 is used to output a monitoring optical signal o12 to wavelength division multiplexer 14; wavelength division multiplexer 14 is used to receive the transmit optical signal o13 through branch port d1 and the monitoring optical signal o12 through branch port d2, and combine the transmit optical signal o13 and the monitoring optical signal o12 to output a combined optical signal o19 to wavelength division multiplexer 11. The combined optical signal o19 includes the transmit optical signal o13 and the monitoring optical signal o12, which means that wavelength division multiplexer 14 transmits the transmit optical signal o13 and the monitoring optical signal o12 to wavelength division multiplexer 11.

[0117] The wavelength division multiplexer 11 is used to receive the service optical signal o11 through the branch port a1, receive the multiplexed optical signal o19 through the branch port a2, and multiplex the service optical signal o11 and the multiplexed optical signal o19 to output the multiplexed optical signal o10.

[0118] The wavelength division multiplexer 11 is also used to receive the detection optical signal o13f and transmit the detection optical signal o13f to the wavelength division multiplexer 14 through the branch port a2; the wavelength division multiplexer 14 is also used to transmit the detection optical signal o13f to the sensor device 13; the sensor device 13 is also used to receive the detection optical signal o13f and determine the vibration event of the surrounding environment of the transmission optical fiber 30 to the transmission optical fiber 30 based on the detection optical signal o13f.

[0119] exist Figure 6 In the communication device 20 shown, wavelength division multiplexer 21 is used to output the service optical signal o11 from the multiplexed optical signal o10 through branch port a5, transmit the monitoring optical signal o12 from the multiplexed optical signal o10 to the optical monitoring device 22 through branch port a7, and transmit the monitoring optical signal o21 received at branch port a6 to the transmission optical fiber 30. Wavelength division multiplexer 21 is also used to receive the monitoring optical signal o21 through branch port a6 and output the monitoring optical signal o21. The monitoring optical signal o21 is transmitted to wavelength division multiplexer 11 in communication device 10 through transmission optical fiber 30.

[0120] exist Figure 6In the communication device 10 shown, the wavelength division multiplexer 11 is also used to receive the monitoring optical signal o21 through the common port b1 and transmit the monitoring optical signal o21 to the optical monitoring device 12 through the branch port a3; the optical monitoring device 12 is also used to receive the monitoring optical signal o21 and determine the overhead information K2 of the communication device 20 based on the monitoring optical signal o21.

[0121] In some embodiments, refer to Figure 6 As shown, the optical monitoring device 12 is also used to output a monitoring optical signal o14 to the wavelength division multiplexer 14. The monitoring optical signal o14 is an intensity-modulated pulse optical signal, and the optical monitoring device 12 outputs the monitoring optical signal o14 and the monitoring optical signal o12 in a time-division multiplexing manner. The wavelength of the monitoring optical signal o14f received by the first transmission port of the optical monitoring device 12 belongs to the second band, and the wavelength of the monitoring optical signal o14 output by the first transmission port of the optical monitoring device 12 also belongs to the second band.

[0122] For example, during the process of the optical monitoring device 12 outputting the monitoring optical signal o14, it does not affect the sensor device 13 outputting the transmitting optical signal o13 and receiving the detection optical signal o13f.

[0123] Specifically, during the process of the optical monitoring device 12 outputting the monitoring optical signal o14, the wavelength division multiplexer 14 is used to receive the transmitted optical signal o13 through the branch port d1 and the monitoring optical signal o14 through the branch port d2, and then combine the transmitted optical signal o13 and the monitoring optical signal o14 to output the combined optical signal o19 to the wavelength division multiplexer 11. The combined optical signal o19 includes the transmitted optical signal o13 and the monitoring optical signal o14, which means that the wavelength division multiplexer 14 transmits the transmitted optical signal o13 and the monitoring optical signal o14 to the wavelength division multiplexer 11.

[0124] The wavelength division multiplexer 11 is used to receive the service optical signal o11 through the branch port a1, receive the multiplexed optical signal o19 through the branch port a2, and multiplex the service optical signal o11 and the multiplexed optical signal o19 to output the multiplexed optical signal o10.

[0125] The wavelength division multiplexer 11 is also used to receive the monitoring optical signal o14f and transmit the monitoring optical signal o14f to the wavelength division multiplexer 14 through the branch port a2; the wavelength division multiplexer 14 is also used to transmit the monitoring optical signal o14f to the optical monitoring device 12; the optical monitoring device 12 is also used to determine the fault point information of the transmission optical fiber 30 based on the monitoring optical signal o14f.

[0126] In the third embodiment, refer to Figure 7 As shown, in Figure 6 Based on the fiber optic communication system 100 shown, Figure 7The optical monitoring device 12 in the communication device 10 shown includes a single-fiber bidirectional (BIDI) optical device. The optical monitoring device 12 includes a first transmission port, which is connected to branch port d2 of wavelength division multiplexer 14, but not to branch port a3 of wavelength division multiplexer 11. The wavelength of the optical signal transmitted through the first transmission port of the optical monitoring device 12 belongs to the second band.

[0127] Compared to Figure 6 The communication device 10 shown, Figure 7 In the communication device 10 shown, the wavelength of the monitoring optical signal o21 received by the optical monitoring device 12 belongs to the second band, and the wavelength of the monitoring optical signal o12 output by the optical monitoring device 12 also belongs to the second band, and the wavelengths of the monitoring optical signal o12 and the monitoring optical signal o21 are different. Figure 7 In the communication device 20 shown, the optical monitoring device 22 includes a BIDI optical device and a transmission port. The transmission port of the optical monitoring device 22 is connected to the branch port a7 of the wavelength division multiplexer 21. The wavelength of the monitoring optical signal o21 output by the optical monitoring device 22 belongs to the second band, and the wavelength of the monitoring optical signal o12 received by the optical monitoring device 22 also belongs to the second band.

[0128] Figure 7 The communication device 10 shown is compared to Figure 6 The communication device 10 shown, wavelength division multiplexer 11, is also used to receive monitoring optical signal o21 through common port b1 and transmit monitoring optical signal o21 to wavelength division multiplexer 14 through branch port a2; wavelength division multiplexer 14 is also used to transmit monitoring optical signal o21 to optical monitoring device 12; optical monitoring device 12 is also used to receive monitoring optical signal o21 and determine overhead information K2 of communication device 20 based on monitoring optical signal o21.

[0129] For example, in the case where overhead information K1 includes the clock of communication device 10 and overhead information K2 includes the clock of communication device 20, Figure 7The optical monitoring device 12 shown is also used to align the clock of the communication device 10 with the clock of the communication device 20 according to the overhead information K2 of the communication device 20 and the overhead information K1 of the communication device 10. The optical monitoring device 22 is also used to align the clock of the communication device 20 with the clock of the communication device 10 according to the overhead information K1 of the communication device 10 and the overhead information K2 of the communication device 20, thereby realizing the function of 1588 clock. Since the monitoring optical signal o12 output by the optical monitoring device 12 is transmitted to the optical monitoring device 22 through wavelength division multiplexer 14, wavelength division multiplexer 11, transmission optical fiber 30, and wavelength division multiplexer 21, and the monitoring optical signal o21 output by the optical monitoring device 22 is transmitted to the optical monitoring device 12 through wavelength division multiplexer 21, transmission optical fiber 30, wavelength division multiplexer 11, and wavelength division multiplexer 14, the transmission distance of the monitoring optical signal o12 is equal to the transmission distance of the monitoring optical signal o21. The optical monitoring device 12 and the optical monitoring device 22 can realize the function of a high-precision 1588 clock, such as a 1588 clock function of a few nanoseconds (ns).

[0130] In some embodiments, refer to Figure 7 As shown, the optical monitoring device 12 does not include a BIDI optical device. The optical monitoring device 12 is used to output a monitoring optical signal o14 and receive a monitoring optical signal o14f. Wherein, Figure 7 The process of the optical monitoring device 12 outputting monitoring optical signal o14 and receiving monitoring optical signal o14f shown is similar to... Figure 6 The process of the optical monitoring device 12 shown outputting monitoring optical signal o14 and receiving monitoring optical signal o14f is similar and will not be described in detail here.

[0131] In the fourth embodiment, refer to Figure 8 As shown, compared to Figure 7 The fiber optic communication system 10 shown is... Figure 8 The communication equipment 10 of the fiber optic communication system 10 shown also includes an optical monitoring device 15, which is also referred to as a second optical monitoring device. The transmission port of the optical monitoring device 15 is connected to the branch port a3 of the wavelength division multiplexer 11.

[0132] In some embodiments, Figure 8The optical monitoring device 12 in the communication device 10 shown includes a BIDI optical device. The optical monitoring device 12 receives a monitoring optical signal o21 and outputs a monitoring optical signal o12. The wavelength of the monitoring optical signal o21 received by the optical monitoring device 12 belongs to the second band, and the wavelength of the monitoring optical signal o12 output by the optical monitoring device 12 also belongs to the second band. Furthermore, the wavelengths of the monitoring optical signal o12 and the monitoring optical signal o21 are different. The optical monitoring device 15 receives a monitoring optical signal o14f and outputs a monitoring optical signal o14. The wavelength of the monitoring optical signal o14f received by the optical monitoring device 15 belongs to the fourth band, and the wavelength of the monitoring optical signal o14 output by the optical monitoring device 15 also belongs to the fourth band.

[0133] In this example, Figure 8 In the communication device 10 shown, sensor 13 is used to output a transmitted optical signal o13; optical monitoring device 12 is used to output a monitoring optical signal o12; optical monitoring device 15 is used to output a monitoring optical signal o14; wavelength division multiplexer 14 is used to receive the transmitted optical signal o13 through branch port d1, receive the monitoring optical signal o12 through branch port d2, combine the transmitted optical signal o13 and the monitoring optical signal o12, and output the combined optical signal o19 to wavelength division multiplexer 11.

[0134] The wavelength division multiplexer 11 is used to receive the service optical signal o11 through branch port a1, the multiplexed optical signal o19 through branch port a2, and the monitoring optical signal o14 through branch port a3. It then combines the service optical signal o11, the monitoring optical signal o14, and the multiplexed optical signal o19 to output the multiplexed optical signal o10.

[0135] The wavelength division multiplexer 11 is also used to receive the detection optical signal o13f and transmit the detection optical signal o13f to the wavelength division multiplexer 14 through the branch port a2; the wavelength division multiplexer 14 is also used to transmit the detection optical signal o13f to the sensor device 13; the sensor device 13 is also used to receive the detection optical signal o13f and determine the vibration event of the surrounding environment of the transmission optical fiber 30 to the transmission optical fiber 30 based on the detection optical signal o13f.

[0136] Wavelength division multiplexer 11 is also used to receive monitoring optical signal o21 through common port b1 and transmit monitoring optical signal o21 through branch port a2 to wavelength division multiplexer 14; wavelength division multiplexer 14 is also used to transmit monitoring optical signal o21 to optical monitoring device 12; optical monitoring device 12 is also used to receive monitoring optical signal o21 and determine overhead information K2 of communication device 20 based on monitoring optical signal o21.

[0137] The wavelength division multiplexer 11 is also used to receive the monitoring optical signal o14f and transmit the monitoring optical signal o14f to the optical monitoring device 15 through the branch port a3; the optical monitoring device 15 is also used to receive the monitoring optical signal o14f and determine the fault point information of the transmission optical fiber 30 based on the monitoring optical signal o14f. The optical monitoring device 15 is an OTDR.

[0138] In other embodiments, reference is made to Figure 8 As shown, optical monitoring device 12 does not include a BIDI optical device. Optical monitoring device 12 receives and outputs a monitoring optical signal o14f. The wavelength of the monitoring optical signal o14f received by optical monitoring device 12 belongs to the second band, and the wavelength of the monitoring optical signal o14 output by optical monitoring device 12 also belongs to the second band. Optical monitoring device 12 is an OTDR. Optical monitoring device 15 includes a BIDI optical device. Optical monitoring device 15 receives and outputs a monitoring optical signal o12. The wavelength of the monitoring optical signal o21 received by optical monitoring device 15 belongs to the fourth band, and the wavelength of the monitoring optical signal o12 output by optical monitoring device 15 also belongs to the fourth band. Furthermore, the wavelengths of monitoring optical signals o12 and o21 are different. In this example, the wavelength of the optical signal transmitted at branch port a7 of wavelength division multiplexer 21 in communication device 20 belongs to the fourth band, while the wavelength of the optical signal transmitted at branch port a6 of wavelength division multiplexer 21 belongs to the third band.

[0139] In this example, Figure 8 In the communication device 10 shown, wavelength division multiplexer 14 is used to receive transmit optical signal o13 through branch port d1 and monitor optical signal o14 through branch port d2, and then combine transmit optical signal o13 and monitor optical signal o14 to output combined optical signal o19 to wavelength division multiplexer 11. Wavelength division multiplexer 11 is used to receive service optical signal o11 through branch port a1, receive combined optical signal o19 through branch port a2, and receive monitor optical signal o12 through branch port a3, and then combine service optical signal o11, monitor optical signal o12, and combined optical signal o19 to output combined optical signal o10.

[0140] The wavelength division multiplexer 11 is also used to receive the monitoring optical signal o14f and transmit the monitoring optical signal o14f to the wavelength division multiplexer 14 through the branch port a2; the wavelength division multiplexer 14 is also used to transmit the monitoring optical signal o14f to the optical monitoring device 12; the optical monitoring device 12 is also used to determine the fault point information of the transmission optical fiber 30 based on the monitoring optical signal o14f.

[0141] The wavelength division multiplexer 11 is also used to receive the monitoring optical signal o21 through the common port b1 and transmit the monitoring optical signal o21 to the optical monitoring device 12 through the branch port a3; the optical monitoring device 12 is also used to receive the monitoring optical signal o21 and determine the overhead information K2 of the communication device 20 based on the monitoring optical signal o21.

[0142] For example, Figures 5 to 8 In the optical fiber communication system 100 shown, the transmit optical signal o13 output by the communication device 10 is transmitted in the same direction as the service optical signal o11. The transmit optical signal o13 will affect the service optical signal o11, for example, the transmit optical signal o13 will have a nonlinear effect on the service optical signal o11.

[0143] For example, Figures 5 to 8 In the communication device 10 shown, the sensor 13 and the wavelength division multiplexer 14 can be integrated together, and the integrated device is a sensing component.

[0144] In the fifth to eighth embodiments, as Figures 9 to 12 As shown, in order to prevent the transmitted optical signal o13 from being transmitted in the same direction as the service optical signal o11, a sensor device 23 is installed in the communication device 20.

[0145] In the fifth embodiment, refer to Figure 9 As shown, Figure 9 In the optical fiber communication system 100 shown, the communication device 10 does not include the sensor device 13 and the wavelength division multiplexer 14. The communication device 10 includes a wavelength division multiplexer 11 and an optical monitoring device 12. The common port b1 of the wavelength division multiplexer 11 is connected to the transmission optical fiber 30. The branch port a1 of the wavelength division multiplexer 11 is used to receive service optical signals. The branch port a2 of the wavelength division multiplexer 11 is connected to the receiving port (Rx) of the optical monitoring device 12. The branch port a3 of the wavelength division multiplexer 11 is connected to the transmitting port (Tx) of the optical monitoring device 22.

[0146] like Figure 9 As shown, Figure 9The communication device 20 shown includes a wavelength division multiplexer 21, an optical monitoring device 22, a sensor device 23, and a signal transmission component. The signal transmission component includes a first common port, a first branch port, and a second branch port. The wavelength range of the optical signal transmitted by the first branch port does not overlap with the wavelength range of the optical signal transmitted by the second branch port. The first common port is connected to the first branch port, and the first common port is connected to the second branch port. For example, assuming the wavelength range of the optical signal transmitted at the first branch port is [λe, λf], and the wavelength of the optical signal transmitted at the second branch port is [λg, λh], the first common port of the signal transmission component is connected to the first branch port. This means that the portion of the optical signal with wavelengths belonging to [λe, λf] received at the first common port can be output through the first branch port, and the portion of the optical signal with wavelengths belonging to [λg, λh] received at the first common port can be output through the second branch port. The optical signal with wavelengths belonging to [λe, λf] received at the first branch port can be output through the first common port, and the optical signal with wavelengths belonging to [λe, λf] received at the second branch port can be output through the first common port.

[0147] Specifically, Figure 9 The signal transmission component in the communication device 10 shown is a wavelength division multiplexer 24. The wavelength division multiplexer 24 includes a common port c2, branch ports d3 and d4. Specifically, common port c2 is a first common port, branch port d3 is a first branch port, and branch port d4 is a second branch port. The wavelength division multiplexer 24 has the characteristic that optical signals received at any branch port of the wavelength division multiplexer 24 can be output through the common port c2, and optical signals received at the common port c2 can be output through any branch port of the wavelength division multiplexer 24. The wavelengths of the optical signals transmitted through the multiple branch ports of the wavelength division multiplexer 24 are different. Therefore, it can be determined that the wavelengths of the optical signals transmitted at branch ports d3 and d4 are different. The common port c2 of the wavelength division multiplexer 24 is connected to branch port d3, and the common port c2 of the wavelength division multiplexer 24 is connected to branch port d4.

[0148] exist Figure 9 In the communication device 20 shown, wavelength division multiplexer 21 is also referred to as the first wavelength division multiplexer, optical monitoring device 22 is also referred to as the first optical monitoring device, and wavelength division multiplexer 24 is also referred to as the second wavelength division multiplexer.

[0149] exist Figure 9In the communication device 20 shown, sensor 23 is connected to branch port d3 of wavelength division multiplexer 24, optical monitoring device 22 is connected to branch port d4 of wavelength division multiplexer 24, common port c2 of wavelength division multiplexer 24 is connected to branch port a7 of wavelength division multiplexer 21, and common port b2 of wavelength division multiplexer 21 is connected to transmission optical fiber 30. Branch port a7 is also referred to as the third branch port, and common port b2 is also referred to as the second common port.

[0150] Specifically, in Figure 9 In the communication device 20 shown, the second transmission port of the optical monitoring device 22 is connected to branch port a6 of the wavelength division multiplexer 21, and the first transmission port of the optical monitoring device 22 is connected to branch port d4 of the wavelength division multiplexer 24. Branch port a5 of the wavelength division multiplexer 21 is used to output the service optical signal o11. Branch port a6 is also called the fourth branch port. The second transmission port of the optical monitoring device 22 is also called the receive port (Rx), and the first transmission port of the optical monitoring device 22 is also called the transmit port (Tx).

[0151] For example, in Figure 9 In the communication device 10 shown, the wavelength of the monitoring optical signal o21 received by the optical monitoring device 12 belongs to the second band, the wavelength of the monitoring optical signal o12 output by the optical monitoring device 12 belongs to the fourth band, the wavelength of the optical signal transmitted by the branch port a2 of the wavelength division multiplexer 11 belongs to the third band, and the wavelength of the optical signal transmitted by the branch port a3 of the wavelength division multiplexer 11 belongs to the fourth band.

[0152] exist Figure 9In the communication device 20 shown, the wavelength of the optical signal transmitted by the sensor 23 belongs to the first band. Specifically, the wavelength of the transmitted optical signal o22 output by the sensor 23 belongs to the first band, and the wavelength of the detected optical signal o22f received by the sensor 23 also belongs to the first band. Therefore, the wavelength of the optical signal transmitted by the branch port d3 connected to the sensor 23 in the wavelength division multiplexer 24 belongs to the first band. The wavelength of the optical signal transmitted by the second transmission port of the optical monitoring device 22 belongs to the fourth band. For example, the wavelength of the monitoring optical signal o12 received by the second transmission port of the optical monitoring device 22 belongs to the fourth band. The wavelength of the optical signal transmitted by the first transmission port of the optical monitoring device 22 belongs to the second band. For example, the wavelength of the monitoring optical signal o21 output by the first transmission port of the optical monitoring device 22 belongs to the second band. Therefore, the wavelength of the optical signal transmitted by the branch port d4 connected to the first transmission port of the optical monitoring device 22 in the wavelength division multiplexer 24 belongs to the second band. In wavelength division multiplexing (WDM) 21, the optical signal transmitted at branch port a7 has a wavelength in the third band, which includes the first and second bands. For example, the third band is [λ1, λ2], the second band is [λ5, λ6], and the first band is [λ7, λ8], where λ2 > λ8 > λ7 > λ6 > λ5 > λ1. Therefore, the optical signal transmitted at the common port c1 of WDM 24, which is connected to branch port a7 of WDM 21, has a wavelength in the third band. The optical signal transmitted at branch port a6 of WDM 21 has a wavelength in the fourth band. The first and second bands do not overlap, the first and fourth bands do not overlap, and the second and fourth bands do not overlap. For example, the fourth band is [λ3, λ4], where λ2 > λ8 > λ7 > λ6 > λ5 > λ1 > λ4 > λ3.

[0153] In other embodiments, the order may be λ4>λ3>λ2>λ8>λ7>λ6>λ5>λ1. The embodiments of this application do not limit this to the following.

[0154] exist Figure 9 In the communication device 20 shown, sensor 23 is used to output a transmitted optical signal o22, which is a coherent pulsed optical signal; optical monitoring device 22 is used to output a monitoring optical signal o21 to wavelength division multiplexer 24, which carries overhead information K2 of communication device 20. The monitoring optical signal o21 is also referred to as the first monitoring optical signal, and the overhead information K2 is also referred to as the first overhead information. The monitoring optical signal o21 is a continuous optical signal.

[0155] Wavelength division multiplexer 24 receives the transmit optical signal o22 through branch port d3 and the monitoring optical signal o21 through branch port d4. It then combines the transmit optical signal o22 and the monitoring optical signal o21 to output a combined optical signal o20. The wavelengths of the transmit optical signal o22 and the monitoring optical signal o21 are different. The combined optical signal o20 includes both the transmit optical signal o22 and the monitoring optical signal o21, indicating that wavelength division multiplexer 24 transmits both the transmit optical signal o22 and the monitoring optical signal o21 to wavelength division multiplexer 21.

[0156] Wavelength division multiplexer 21 is used to receive the multiplexed optical signal o20 through branch port a7 and output the multiplexed optical signal o20 through common port b2.

[0157] The combined optical signal o20 is transmitted to the wavelength division multiplexer 11 in the communication device 10 through the transmission optical fiber 30. The transmit optical signal o22 in the combined optical signal o20 is scattered after being transmitted through the transmission optical fiber 30 to obtain the detection optical signal o22f. Specifically, the transmit optical signal o22 undergoes Rayleigh scattering during transmission in the transmission optical fiber 30 and is then transmitted in the reverse direction. The optical signal transmitted in the reverse direction is the detection optical signal o22f. The detection optical signal o22f carries the vibration events caused by the surrounding environment of the transmission optical fiber 30 on the transmission optical fiber 30.

[0158] The wavelength division multiplexer 21 is also used to receive the detection optical signal o22f and transmit the detection optical signal o22f to the wavelength division multiplexer 24 through the branch port a7; the wavelength division multiplexer 24 is also used to transmit the detection optical signal o22f to the sensor device 23; the sensor device 23 is also used to receive the detection optical signal o22f and determine the vibration event of the surrounding environment of the transmission optical fiber 30 to the transmission optical fiber 30 based on the detection optical signal o22f.

[0159] exist Figure 9 In the communication device 10 shown, wavelength division multiplexer 11 is used to receive multiplexed optical signal o20 through common port b1 and transmit the monitoring optical signal o21 in the multiplexed optical signal o20 to optical monitoring device 12 through branch port a2.

[0160] The optical monitoring device 12 is used to determine the overhead information K2 of the communication device 20 based on the monitoring optical signal o21.

[0161] The optical monitoring device 12 is also used to output a monitoring optical signal o12, which carries the overhead information K1 of the communication device 10. The monitoring optical signal o12 is a continuous optical signal. The monitoring optical signal o12 is also referred to as the second monitoring optical signal, and the overhead information K1 is also referred to as the second overhead information.

[0162] Wavelength division multiplexer 11 receives service optical signal o11 through branch port a1 and monitoring optical signal o12 through branch port a3. It then combines the service optical signal o11 and the monitoring optical signal o12 to output a combined optical signal o10. The combined optical signal o10 includes both the service optical signal o11 and the monitoring optical signal o12, meaning that wavelength division multiplexer 11 transmits both signals to transmission optical fiber 30. The combined optical signal o10 is then transmitted to communication equipment 20 via transmission optical fiber 30.

[0163] exist Figure 9 In the communication device 20 shown, wavelength division multiplexer 21 is used to receive multiplexed optical signal o10 through common port b2, output service optical signal o11 in multiplexed optical signal o10 through branch port a5, and transmit monitoring optical signal o12 in multiplexed optical signal o10 to optical monitoring device 22 through branch port a6; optical monitoring device 22 is used to determine overhead information K1 of communication device 10 based on the received monitoring optical signal o12.

[0164] For example, the optical monitoring device 12 is further configured to align the clock of the communication device 10 with the clock of the communication device 20 based on the overhead information K2 of the communication device 20 and the overhead information K1 of the communication device 10, and the optical monitoring device 22 is further configured to align the clock of the communication device 20 with the clock of the communication device 10 based on the overhead information K1 of the communication device 10 and the overhead information K2 of the communication device 20, thereby realizing the function of 1588 clock. However, since the monitoring optical signal o12 output by the optical monitoring device 12 is transmitted to the optical monitoring device 22 through wavelength division multiplexer 11, transmission fiber 30, and wavelength division multiplexer 21, while the monitoring optical signal o21 output by the optical monitoring device 22 is transmitted to the optical monitoring device 12 through wavelength division multiplexer 24, wavelength division multiplexer 21, transmission fiber 30, and wavelength division multiplexer 11, the transmission distance of the monitoring optical signal o12 and the transmission distance of the monitoring optical signal o21 have a large error. Therefore, the optical monitoring devices 12 and 22 can only achieve the function of a low-precision 1588 clock, such as a 1588 clock function of tens of nanoseconds.

[0165] In some embodiments, refer to Figure 9As shown, the optical monitoring device 22 is also used to output a monitoring optical signal o23 and receive a monitoring optical signal o23f. The pulse width of the monitoring optical signal o23 is greater than the pulse width of the transmitted optical signal o22. The wavelength of the monitoring optical signal o23f received by the first transmission port of the optical monitoring device 22 belongs to the second band, and the wavelength of the monitoring optical signal o23 output by the first transmission port of the optical monitoring device 22 also belongs to the second band. The monitoring optical signal o23 is an intensity-modulated pulse optical signal, and the optical monitoring device 22 outputs monitoring optical signals o21 and o23 to the wavelength division multiplexer 24 in a time-division manner. The monitoring optical signal o23 is also referred to as the third monitoring optical signal, and the monitoring optical signal o23f is also referred to as the fourth monitoring optical signal.

[0166] For example, during the process of the optical monitoring device 22 outputting the monitoring optical signal o23, it does not affect the sensor device 23 outputting the transmitted optical signal o22 and receiving the detection optical signal o22f.

[0167] Specifically, during the process of the optical monitoring device 22 outputting the monitoring optical signal o23, the wavelength division multiplexer 24 receives the transmitted optical signal o22 through branch port d3 and the monitoring optical signal o23 through branch port d4, and combines the transmitted optical signal o22 and the monitoring optical signal o23 to output the combined optical signal o20. The combined optical signal o20 includes the transmitted optical signal o22 and the monitoring optical signal o23, which means that the wavelength division multiplexer 24 transmits the transmitted optical signal o22 and the monitoring optical signal o23 to the wavelength division multiplexer 21.

[0168] Wavelength division multiplexer 21 is used to receive the multiplexed optical signal o20 through branch port a7 and output the multiplexed optical signal o20 through common port b2.

[0169] Furthermore, the monitoring optical signal o23 in the combined optical signal o20 is scattered after being transmitted through the transmission optical fiber 30 to obtain the monitoring optical signal o23f, the wavelength of which is the same as that of the monitoring optical signal o23. Specifically, the monitoring optical signal o23 undergoes Rayleigh scattering during transmission through the transmission optical fiber 30 and is then transmitted in the opposite direction. The transmitted optical signal is the monitoring optical signal o23f, which carries information about the fault points in the transmission optical fiber 30. For example, a fault point in the monitoring optical signal o23 may reflect the signal, causing the monitoring optical signal o23f to include multiple peaks. The information about the fault points in the transmission optical fiber 30 may include, for example, the location and loss of refractive index inhomogeneity, the location and loss of defects, the location and loss of breaks, the location and loss of splice couplings, etc.

[0170] The wavelength division multiplexer 21 is also used to receive the monitoring optical signal o23f and transmit the monitoring optical signal o23f to the wavelength division multiplexer 24 through the branch port a7; the wavelength division multiplexer 24 is also used to transmit the monitoring optical signal o23f to the optical monitoring device 22; the optical monitoring device 22 is also used to determine the fault point information of the transmission optical fiber 30 based on the monitoring optical signal o23f.

[0171] exist Figure 9 When the optical monitoring device 22 outputs monitoring optical signals o21 and o23 in a time-division manner, it can detect fault points in the transmission optical fiber 30 and transmit overhead information K2. That is, the optical monitoring device 22 can integrate the functions of an optical time-domain reflectometer (OTDR).

[0172] In the sixth embodiment, refer to Figure 10 As shown, compared to Figure 9 The fiber optic communication system 100 shown is... Figure 10 In the communication device 20 of the fiber optic communication system 100 shown, the second transmission port of the optical monitoring device 22 is connected to the branch port a6 of the wavelength division multiplexer 21, and the first transmission port of the optical monitoring device 22 is connected to the branch port d4 of the wavelength division multiplexer 24. Figure 10 In the communication device 20 shown, the wavelength of the optical signal transmitted through the first transmission port of the optical monitoring device 22 belongs to the second band. For example, the wavelength of the monitoring optical signal o12 received by the first transmission port of the optical monitoring device 22 belongs to the second band. The wavelength of the optical signal transmitted through the second transmission port of the optical monitoring device 22 belongs to the fourth band. For example, the wavelength of the monitoring optical signal o21 output by the second transmission port of the optical monitoring device 22 belongs to the fourth band. The second transmission port of the optical monitoring device 22 is also called the transmitting port (Tx), and the first transmission port of the optical monitoring device 22 is also called the receiving port (Rx).

[0173] Figure 10 In the communication device 10 of the optical fiber communication system 100 shown, the receiving port (Rx) of the optical monitoring device 12 is connected to the branch port a3 of the wavelength division multiplexer 11, and the transmitting port (Tx) of the optical monitoring device 12 is connected to the branch port a2 of the wavelength division multiplexer 11. The wavelength of the monitoring optical signal o21 received by the optical monitoring device 12 belongs to the fourth band, and the wavelength of the monitoring optical signal o12 output by the optical monitoring device 12 belongs to the second band.

[0174] exist Figure 10In the communication device 20 shown, sensor 23 is used to output a transmit optical signal o22, which is a coherent pulse optical signal; wavelength division multiplexer 24 is used to transmit the transmit optical signal o22 received by branch port d3 to wavelength division multiplexer 21 through common port c2.

[0175] The optical monitoring device 22 is used to output a monitoring optical signal o21 to the wavelength division multiplexer 21. The monitoring optical signal o21 carries the overhead information K2 of the communication device 20.

[0176] Wavelength division multiplexer 21 is used to receive the transmit optical signal o22 through branch port a7, receive the monitoring optical signal o21 through branch port a6, and combine the transmit optical signal o22 and the monitoring optical signal o21 to output the combined optical signal o20.

[0177] The wavelength division multiplexer 21 is also used to receive the detection optical signal o22f and transmit the detection optical signal o22f to the wavelength division multiplexer 24 through the branch port a7; the wavelength division multiplexer 24 is also used to transmit the detection optical signal o22f to the sensor device 23; the sensor device 23 is also used to receive the detection optical signal o22f and determine the vibration event of the surrounding environment of the transmission optical fiber 30 to the transmission optical fiber 30 based on the detection optical signal o22f.

[0178] exist Figure 10 In the communication device 10 shown, wavelength division multiplexer 11 is used to receive multiplexed optical signal o20 through common port b1, and transmit the monitoring optical signal o21 in the multiplexed optical signal o20 to optical monitoring device 12 through branch port a3. Wavelength division multiplexer 11 is also used to receive service optical signal o11 through branch port a1, receive monitoring optical signal o12 through branch port a2, multiplex service optical signal o11 and monitoring optical signal o12, and output multiplexed optical signal o10.

[0179] Wavelength division multiplexer 21 is also used to receive multiplexed optical signal o10 through common port b2, and transmit the monitoring optical signal o12 in the multiplexed optical signal o10 to wavelength division multiplexer 24 through branch port a7. Wavelength division multiplexer 24 is used to transmit the monitoring optical signal o12 to optical monitoring device 22 through branch port d4. Optical monitoring device 22 is used to determine the overhead information K1 of communication device 10 based on the received monitoring optical signal o12.

[0180] In some embodiments, refer to Figure 10As shown, the optical monitoring device 22 is also used to output monitoring optical signal o23 and receive monitoring optical signal o23f. The pulse width of the monitoring optical signal o23 is greater than the pulse width of the transmitted optical signal o22. The wavelength of the monitoring optical signal o23f received by the second transmission port of the optical monitoring device 22 belongs to the fourth band. The wavelength of the monitoring optical signal o23 output by the second transmission port of the optical monitoring device 22 belongs to the fourth band. The monitoring optical signal o23 is an intensity-modulated pulse optical signal. The optical monitoring device 22 outputs monitoring optical signal o21 and monitoring optical signal o23 in a time-division multiplexing manner.

[0181] For example, during the process of the optical monitoring device 22 outputting the monitoring optical signal o23, it does not affect the sensor device 23 outputting the transmitted optical signal o22 and receiving the detection optical signal o22f.

[0182] Specifically, during the process of the optical monitoring device 22 outputting the monitoring optical signal o23, the wavelength division multiplexer 21 receives the transmitted optical signal o22 through branch port a7 and the monitoring optical signal o23 through branch port a6, and combines the transmitted optical signal o22 and the monitoring optical signal o23 to output the combined optical signal o20 to the transmission optical fiber 30. The combined optical signal o20 includes the transmitted optical signal o22 and the monitoring optical signal o23, which means that the wavelength division multiplexer 21 transmits the transmitted optical signal o22 and the monitoring optical signal o23 to the transmission optical fiber 30.

[0183] The wavelength division multiplexer 21 is also used to receive the monitoring optical signal o23f and transmit the monitoring optical signal o23f to the optical monitoring device 22 through the branch port a6; the optical monitoring device 22 is also used to determine the fault point information of the transmission optical fiber 30 based on the monitoring optical signal o23f.

[0184] In the seventh embodiment, refer to Figure 11 As shown, in Figure 9 Based on the fiber optic communication system 100 shown, Figure 11 The optical monitoring device 22 in the communication device 20 shown includes a BIDI optical device. The optical monitoring device 22 includes a first transmission port. The first transmission port of the optical monitoring device 22 is connected to the branch port d4 of the wavelength division multiplexer 24, and the optical monitoring device 22 is not connected to the branch port a6 of the wavelength division multiplexer 21.

[0185] Compared to Figure 9 The communication device 20 shown, Figure 11 In the communication device 20 shown, the wavelength of the monitoring optical signal o21 output from the first transmission port of the optical monitoring device 22 belongs to the second band, and the wavelength of the monitoring optical signal o12 received by the first transmission port of the optical monitoring device 22 also belongs to the second band, and the wavelengths of the monitoring optical signal o12 and the monitoring optical signal o21 are different. Figure 11In the communication device 10 shown, the optical monitoring device 12 includes a BIDI optical device and a transmission port. The transmission port of the optical monitoring device 12 is connected to the branch port a2 of the wavelength division multiplexer 11. The wavelength of the monitoring optical signal o21 received by the optical monitoring device 12 belongs to the second band, and the wavelength of the monitoring optical signal o12 output by the optical monitoring device 12 also belongs to the second band.

[0186] Figure 11 The communication device 20 shown is compared to Figure 9 The communication device 20 shown includes a wavelength division multiplexer 21, which receives a multiplexed optical signal o10 through a common port b2 and transmits the monitoring optical signal o12 in the multiplexed optical signal o10 to a wavelength division multiplexer 24 through a branch port a7. The wavelength division multiplexer 24 transmits the monitoring optical signal o12 to an optical monitoring device 22 through a branch port d4. The optical monitoring device 22 is used to determine the overhead information K1 of the communication device 10 based on the received monitoring optical signal o12.

[0187] For example, Figure 11 The optical monitoring device 12 shown is also used to align the clock of the communication device 10 with the clock of the communication device 20 according to the overhead information K2 of the communication device 20 and the overhead information K1 of the communication device 10. The optical monitoring device 22 is also used to align the clock of the communication device 20 with the clock of the communication device 10 according to the overhead information K1 of the communication device 10 and the overhead information K2 of the communication device 20, thereby realizing the function of 1588 clock. Since the monitoring optical signal o21 output by the optical monitoring device 22 is transmitted to the optical monitoring device 12 through wavelength division multiplexer 24, wavelength division multiplexer 21, transmission optical fiber 30, and wavelength division multiplexer 11, and the monitoring optical signal o12 output by the optical monitoring device 12 is transmitted to the optical monitoring device 22 through wavelength division multiplexer 11, transmission optical fiber 30, wavelength division multiplexer 21, and wavelength division multiplexer 24, the transmission distance of the monitoring optical signal o12 is equal to that of the monitoring optical signal o21. The optical monitoring device 12 and the optical monitoring device 22 can achieve a high-precision 1588 clock function, such as a 1588 clock function of a few nanoseconds (ns).

[0188] In some embodiments, refer to Figure 11 As shown, the optical monitoring device 22 does not include a BIDI optical device. The optical monitoring device 22 is used to output a monitoring optical signal o23 and receive a monitoring optical signal o23f. Wherein, Figure 11 The process of the optical monitoring device 22 outputting monitoring optical signal o23 and receiving monitoring optical signal o23f is as follows: Figure 9 The process of the optical monitoring device 22 shown outputting monitoring optical signal o23 and receiving monitoring optical signal o23f is similar and will not be described in detail here.

[0189] In the eighth embodiment, refer to Figure 12As shown, compared to Figure 11 The fiber optic communication system 10 shown is... Figure 12 The communication equipment 20 of the fiber optic communication system 10 shown also includes an optical monitoring device 25, which is also referred to as a second optical monitoring device. The transmission port of the optical monitoring device 25 is connected to the branch port a6 of the wavelength division multiplexer 21.

[0190] In some embodiments, Figure 12 The optical monitoring device 22 in the communication device 20 shown includes a BIDI optical device. The optical monitoring device 22 outputs a monitoring optical signal o21 and receives a monitoring optical signal o12. The wavelength of the monitoring optical signal o21 output from the first transmission port of the optical monitoring device 22 belongs to the second band, and the wavelength of the monitoring optical signal o12 received from the first transmission port of the optical monitoring device 22 also belongs to the second band. Furthermore, the wavelengths of monitoring optical signals o12 and o21 are different. The optical monitoring device 25 receives a monitoring optical signal o23f and outputs a monitoring optical signal o23. The wavelength of the monitoring optical signal o23f received by the optical monitoring device 25 belongs to the fourth band, and the wavelength of the monitoring optical signal o23 output by the optical monitoring device 25 also belongs to the fourth band.

[0191] In this example, sensor 23 outputs a transmitted optical signal o22; optical monitoring device 22 outputs a monitoring optical signal o21 to wavelength division multiplexer 24; optical monitoring device 25 outputs a monitoring optical signal o23 to wavelength division multiplexer 21; wavelength division multiplexer 24 receives the transmitted optical signal o22 through branch port d3 and the monitoring optical signal o21 through branch port d4, combines the transmitted optical signal o22 and the monitoring optical signal o21, and outputs a combined optical signal o29 to wavelength division multiplexer 21. The combined optical signal o29 includes the transmitted optical signal o22 and the monitoring optical signal o21, indicating that wavelength division multiplexer 24 transmits both the transmitted optical signal o22 and the monitoring optical signal o21 to wavelength division multiplexer 21.

[0192] Wavelength division multiplexer 21 is used to receive the multiplexed optical signal o29 through branch port a7 and the monitoring optical signal o23 through branch port a6. It then multiplexes the monitoring optical signal o23 with the multiplexed optical signal o29, and transmits the multiplexed optical signal o20 to the transmission optical fiber 30. The multiplexed optical signal o20 includes the transmit optical signal o22, the monitoring optical signal o21, and the monitoring optical signal o23, meaning that wavelength division multiplexer 21 transmits the transmit optical signal o22, the monitoring optical signal o21, and the monitoring optical signal o23 to the transmission optical fiber 23.

[0193] The wavelength division multiplexer 21 is also used to receive the detection optical signal o22f and transmit the detection optical signal o22f to the wavelength division multiplexer 24 through the branch port a7; the wavelength division multiplexer 24 is also used to transmit the detection optical signal o22f to the sensor device 23; the sensor device 23 is also used to receive the detection optical signal o22f and determine the vibration event of the surrounding environment of the transmission optical fiber 30 to the transmission optical fiber 30 based on the detection optical signal o22f.

[0194] The wavelength division multiplexer 21 is also used to receive the monitoring optical signal o23f and transmit it to the optical monitoring device 25 through the branch port a6; the optical monitoring device 25 is also used to receive the monitoring optical signal o23f and determine the fault point information of the transmission optical fiber 30 based on the monitoring optical signal o23f. The optical monitoring device 15 is an OTDR.

[0195] The wavelength division multiplexer 21 is also used to receive the multiplexed optical signal o10 through the common port b1, output the service optical signal o11 in the multiplexed optical signal o10 through the branch port a5, and transmit the monitoring optical signal o12 in the multiplexed optical signal o10 to the wavelength division multiplexer 24 through the branch port a7; the wavelength division multiplexer 24 is also used to transmit the monitoring optical signal o12 to the optical monitoring device 22; the optical monitoring device 22 is also used to receive the monitoring optical signal o12 and determine the overhead information K1 of the communication device 10 based on the monitoring optical signal o12.

[0196] In other embodiments, reference is made to Figure 12 As shown, optical monitoring device 22 does not include a BIDI optical device. Optical monitoring device 22 receives and outputs a monitoring optical signal o23f. The wavelength of the monitoring optical signal o23f received by optical monitoring device 22 belongs to the second band, and the wavelength of the monitoring optical signal o23 output by optical monitoring device 22 also belongs to the second band. Optical monitoring device 22 is an OTDR. Optical monitoring device 25 includes a BIDI optical device. Optical monitoring device 25 outputs a monitoring optical signal o21 and receives a monitoring optical signal o12. The wavelength of the monitoring optical signal o21 output by optical monitoring device 25 belongs to the fourth band, and the wavelength of the monitoring optical signal o12 received by optical monitoring device 25 also belongs to the fourth band. Furthermore, the wavelengths of monitoring optical signals o12 and o21 are different. In this example, the wavelength of the optical signal transmitted at branch port a2 of wavelength division multiplexer 11 in communication device 10 belongs to the fourth band, while the wavelength of the optical signal transmitted at branch port a3 of wavelength division multiplexer 11 belongs to the third band.

[0197] In this example, Figure 12In the communication device 20 shown, wavelength division multiplexer 24 receives the transmit optical signal o22 through branch port d3 and the monitoring optical signal o23 through branch port d4, and combines the transmit optical signal o22 and the monitoring optical signal o23 to output the combined optical signal o29 to wavelength division multiplexer 11. Wavelength division multiplexer 21 receives the combined optical signal o29 through branch port a7 and the monitoring optical signal o21 through branch port a6, and combines the monitoring optical signal o21 and the combined optical signal o29 to output the combined optical signal o20.

[0198] The wavelength division multiplexer 21 is also used to receive the detection optical signal o22f and transmit the detection optical signal o22f to the wavelength division multiplexer 24 through the branch port a7; the wavelength division multiplexer 24 is also used to transmit the detection optical signal o22f to the sensor device 23; the sensor device 23 is also used to receive the detection optical signal o22f and determine the vibration event of the surrounding environment of the transmission optical fiber 30 to the transmission optical fiber 30 based on the detection optical signal o22f.

[0199] The wavelength division multiplexer 21 is also used to receive the monitoring optical signal o23f and transmit the monitoring optical signal o23f to the wavelength division multiplexer 24 through the branch port a7; the wavelength division multiplexer 24 is also used to transmit the monitoring optical signal o23f to the optical monitoring device 22; the optical monitoring device 22 is also used to determine the fault point information of the transmission optical fiber 30 based on the monitoring optical signal o23f.

[0200] The wavelength division multiplexer 21 is also used to receive the multiplexed optical signal o10 through the common port b1, output the service optical signal o11 in the multiplexed optical signal o10 through the branch port a5, and transmit the monitoring optical signal o12 in the multiplexed optical signal o10 to the optical monitoring device 22 through the branch port a6; the optical monitoring device 22 is also used to receive the monitoring optical signal o12 and determine the overhead information K1 of the communication device 10 based on the monitoring optical signal o12.

[0201] For example, Figures 9 to 12 In the communication device 20 shown, the sensor 23 and the wavelength division multiplexer 24 can be integrated together, and the integrated device is a sensing component.

[0202] For example, Figures 5 to 8 In the fiber optic communication system 100 shown, the sensor device 13 can detect the transmission fiber 30. Figures 9 to 12 In the fiber optic communication system 100 shown, the sensor 23 can detect the transmission fiber 30. In some embodiments, when the length of the transmission fiber 30 is greater than the length of the transmission fiber that the sensor 13 can detect, the longer transmission fiber 30 can be detected by providing the sensor 13 in the communication device 10 and the sensor 23 in the communication device 20.

[0203] When the length of the transmission optical fiber 30 is greater than the length of the transmission optical fiber that the sensor device 13 can detect, in order to achieve detection of the longer transmission optical fiber 30, such as Figure 13 As shown, Figure 13 In the fiber optic communication system 100 shown, the communication device 10 is... Figure 5 The communication devices 10 and 20 shown are Figure 9 The communication device 20 shown; such as Figure 14 As shown, Figure 14 In the fiber optic communication system 100 shown, the communication device 10 is... Figure 6 The communication devices 10 and 20 shown are Figure 10 The communication device 20 shown; such as Figure 15 As shown, Figure 15 In the fiber optic communication system 100 shown, the communication device 10 is... Figure 7 The communication devices 10 and 20 shown are Figure 11 The communication device 20 shown; such as Figure 16 As shown, Figure 16 In the fiber optic communication system 100 shown, the communication device 10 is... Figure 8 The communication devices 10 and 20 shown are Figure 12 The communication device 20 shown.

[0204] In some embodiments, refer to Figure 17 As shown, Figure 17 It shows Figure 5 or Figure 13 Another structural schematic diagram of the communication device 10 shown, in Figure 17 In the communication device 10 shown, the signal transmission component 30 includes a beam splitter 31, a filter 32, and a filter 33. Filter 32 is also referred to as the first filter, and filter 33 is also referred to as the second filter. The common port e of the beam splitter 31 is the first common port of the signal transmission component 30. The beam splitting port f1 of the beam splitter 31 is connected to the transmission port h5 of the filter 32. The transmission port h1 of the filter 32 is the first branch port of the signal transmission component 30. The beam splitting port f2 of the beam splitter 31 is connected to the transmission port h6 of the filter 33. The transmission port h2 of the filter 33 is the second branch port of the signal transmission component 30. The passband wavelength range of the filter 32 and the passband wavelength range of the filter 33 do not overlap. The beam splitter 31's beam splitting port f1 is also called the first beam splitting port, the beam splitter 31's beam splitting port f2 is also called the second beam splitting port, the filter 32's transmission port h5 is also called the first transmission port, the filter 32's transmission port h1 is also called the second transmission port, the filter 33's transmission port h6 is also called the third transmission port, and the filter 33's transmission port h2 is also called the fourth transmission port.

[0205] For example, assuming the passband wavelength range of filter 32 is [λa, λb], then the wavelength range of the optical signal transmitted through transmission port h1 is [λa, λb]. Assuming the passband wavelength range of filter 33 is [λc, λd], then the wavelength range of the optical signal transmitted through transmission port h2 is [λc, λd]. Specifically, beam splitter 31 receives the first optical signal through common port e, splits the first optical signal into a first part and a second part, transmits the first part of the optical signal through beam splitter 31's splitting port f1 to filter 32, and transmits the second part of the optical signal through beam splitter 31's splitting port f2 to filter 33. Filter 32 is used to output the portion of the first part of the optical signal with wavelengths belonging to [λa, λb]; filter 33 is used to output the portion of the second part of the optical signal with wavelengths belonging to [λc, λd]. Signal transmission is also normal in the reverse direction. In some embodiments, the ratio of the first part of the optical signal to the second part of the optical signal is 50:50. It can be seen that... Figure 17 In the signal transmission component 30 shown, the portion of the optical signal with wavelengths belonging to [λa, λb] received at the common port e can be output through the transmission port h1, the portion of the optical signal with wavelengths belonging to [λc, λd] received at the common port e can be output through the transmission port h2, the optical signal with wavelengths belonging to [λa, λb] received at the transmission port h1 can be output through the common port e, and the optical signal with wavelengths belonging to [λc, λd] received at the transmission port h2 can be output through the common port e.

[0206] exist Figure 17 In the communication device 10 shown, sensor 13 is connected to the transmission port h1 of filter 32, optical monitoring device 12 is connected to the transmission port h2 of filter 33, common port e of optical splitter 31 is connected to branch port a2 of wavelength division multiplexer 11, and common port b1 of wavelength division multiplexer 11 is connected to transmission optical fiber 30.

[0207] Compared to Figure 5 The communication device 10 shown is in Figure 17 In the communication device 10 shown, the passband wavelength range of the filter 32 is the first band, so that the wavelength of the optical signal transmitted through the transmission port h1 of the filter 32 belongs to the first band, and the passband wavelength range of the filter 33 is the second band, so that the wavelength of the optical signal transmitted through the transmission port h2 of the filter 33 belongs to the second band.

[0208] Compared to Figure 5 The communication device 10 shown is in Figure 17 In the communication device 10 shown, the signal transmission component 30 implements... Figure 5The wavelength division multiplexer 14 shown is functional. For example, sensor 13 outputs a transmitted optical signal o13, and signal transmission component 30 transmits the transmitted optical signal o13 to wavelength division multiplexer 11. Specifically, the wavelength of the transmitted optical signal o13 belongs to the first band, therefore, the filter 32 in signal transmission component 30 transmits the received transmitted optical signal o13 to the splitting port f1 of the beam splitter 31 of signal transmission component 30; beam splitter 31 transmits the transmitted optical signal o13 received at splitting port f1 to wavelength division multiplexer 11 through the common port e of beam splitter 31.

[0209] For example, wavelength division multiplexer 11 is also used to receive detection optical signal o13f and transmit detection optical signal o13f to signal transmission component 30 through branch port a2; signal transmission component 30 is also used to transmit detection optical signal o13f to sensor device 13. Specifically, detection optical signal o13f is transmitted to common port e of beam splitter 31. The wavelength of detection optical signal o13f belongs to the first band. Beam splitter 31 divides detection optical signal o13f into a first part detection optical signal and a second part detection optical signal. The first part detection optical signal is transmitted to filter 32, and the second part detection optical signal is transmitted to filter 33. Filter 32 transmits the first part detection optical signal with wavelength belonging to the first band to sensor device 13 through transmission port h1 of filter 32. Filter 33 blocks the output of the second part detection optical signal with wavelength belonging to the first band.

[0210] For example, wavelength division multiplexer 11 receives monitoring optical signal o21 through common port b1 and transmits monitoring optical signal o21 to signal transmission component 30 through branch port a2. Signal transmission component 20 transmits monitoring optical signal o21 to optical monitoring device 12. Specifically, monitoring optical signal o21 is transmitted to common port e of beam splitter 31. The wavelength of monitoring optical signal o21 belongs to the second band. Beam splitter 31 divides monitoring optical signal o21 into a first part monitoring optical signal and a second part monitoring optical signal. The first part monitoring optical signal is transmitted to filter 32, and the second part monitoring optical signal is transmitted to filter 33. Filter 32 blocks the first part monitoring optical signal with wavelength belonging to the second band. Filter 33 transmits the second part monitoring optical signal with wavelength belonging to the second band to optical monitoring device 12 through transmission port h2 of filter 33.

[0211] In some embodiments, refer to Figure 18 As shown, Figure 18 It shows Figure 6 or Figure 14 Another structural schematic diagram of the communication device 10 shown, wherein, Figure 18 The signal transmission component 30 shown is... Figure 17The structure and connection method of the signal transmission component 30 shown are the same, and will not be described in detail here. The difference is that... Figure 17 The first transmission port of the optical monitoring device 12 shown is the receiving port (Rx). Figure 18 The first transmission port of the optical monitoring device 12 shown is the transmit port (Tx).

[0212] Compared to Figure 6 The communication device 10 shown is in Figure 18 In the communication device 10 shown, the signal transmission component 30 implements... Figure 6 The wavelength division multiplexer 14 shown has the following functions. For example, sensor 13 is used to output a transmitted optical signal o13; optical monitoring device 12 is used to output a monitoring optical signal o12 to signal transmission component 30; signal transmission component 30 is used to receive the transmitted optical signal o13, receive the monitoring optical signal o12, combine the transmitted optical signal o13 and the monitoring optical signal o12, and output a combined optical signal o19 to wavelength division multiplexer 11. The combined optical signal o19 includes the transmitted optical signal o13 and the monitoring optical signal o12, which means that signal transmission component 30 transmits the transmitted optical signal o13 and the monitoring optical signal o12 to wavelength division multiplexer 11. Specifically, the filter 32 in the signal transmission component 30 is used to receive the transmitted optical signal o13 and transmit the transmitted optical signal o13 to the optical splitter 31. The filter 33 is used to receive the monitoring optical signal o12 and transmit the monitoring optical signal o12 to the optical splitter 31. The optical splitter 31 combines the transmitted optical signal o13 and the monitoring optical signal o12 and outputs the combined optical signal o19 to the wavelength division multiplexer 11.

[0213] For example, wavelength division multiplexer 11 is also used to receive detection optical signal o13f and transmit detection optical signal o13f to signal transmission component 30 through branch port a2; signal transmission component 30 is also used to transmit detection optical signal o13f with wavelength belonging to the first band to sensor component 13.

[0214] For example, in Figure 18 During the process of the optical monitoring device 12 outputting the monitoring optical signal o14, the signal transmission component 30 is used to receive the transmitted optical signal o13 and the monitoring optical signal o14, and then combine the transmitted optical signal o13 and the monitoring optical signal o14 to output the combined optical signal o19 to the wavelength division multiplexer 11. The combined optical signal o19 includes the transmitted optical signal o13 and the monitoring optical signal o14, which means that the signal transmission component 30 transmits the transmitted optical signal o13 and the monitoring optical signal o14 to the wavelength division multiplexer 11. The wavelength division multiplexer 11 is also used to receive the monitoring optical signal o14f and transmit the monitoring optical signal o14f to the signal transmission component 30 through the branch port a2; the signal transmission component 30 is also used to transmit the monitoring optical signal o14f, whose wavelength belongs to the second band, to the optical monitoring device 12.

[0215] In some embodiments, refer to Figure 19 As shown, Figure 19 It shows Figure 7 or Figure 8 or Figure 15 or Figure 16 Another structural schematic diagram of the communication device 10 shown, and Figure 7 and Figure 15 The communication device 10 shown does not include the optical monitoring device 15. Figure 8 and Figure 16 The communication device 10 shown includes an optical monitoring device 15.

[0216] in, Figure 19 The signal transmission component 30 shown is... Figure 17 The signal transmission component 30 shown has the same structure. Figure 19 In the communication device 10 shown, sensor 13 is connected to the transmission port h1 of filter 32, optical monitoring device 12 is connected to the transmission port h2 of filter 33, common port e of optical splitter 31 is connected to branch port a2 of wavelength division multiplexer 11, and common port b1 of wavelength division multiplexer 11 is connected to transmission optical fiber 30. Figure 19 The optical monitoring device 12 shown includes a single-fiber bidirectional BIDI optical device.

[0217] Compared to Figure 7 The communication device 10 shown is in Figure 19 In the communication device 10 shown, the signal transmission component 30 implements... Figure 7 The wavelength division multiplexer 14 shown has the following functions. For example, the signal transmission component 30 is used to receive the transmit optical signal o13, receive the monitoring optical signal o12, combine the transmit optical signal o13 and the monitoring optical signal o12, and output the combined optical signal o19 to the wavelength division multiplexer 11. For example, the wavelength division multiplexer 11 is also used to receive the detection optical signal o13f, and transmit the detection optical signal o13f to the signal transmission component 30 through the branch port a2; the signal transmission component 30 is also used to transmit the detection optical signal o13f with a wavelength belonging to the first band to the sensor device 13. For another example, the wavelength division multiplexer 11 is also used to receive the monitoring optical signal o21 through the common port b1, and transmit the monitoring optical signal o21 to the signal transmission component 30 through the branch port a2; the signal transmission component 30 is also used to transmit the monitoring optical signal o21 with a wavelength belonging to the second band to the optical monitoring device 12.

[0218] exist Figure 19During the process of the optical monitoring device 12 outputting the monitoring optical signal o14, the signal transmission component 30 is used to receive the transmitted optical signal o13 and the monitoring optical signal o14, and then combine the transmitted optical signal o13 and the monitoring optical signal o14 to output the combined optical signal o19 to the wavelength division multiplexer 11. The combined optical signal o19 includes the transmitted optical signal o13 and the monitoring optical signal o14, which means that the signal transmission component 30 transmits the transmitted optical signal o13 and the monitoring optical signal o14 to the wavelength division multiplexer 11. The wavelength division multiplexer 11 is also used to receive the monitoring optical signal o14f and transmit the monitoring optical signal o14f to the signal transmission component 30 through the branch port a2; the signal transmission component 30 is also used to transmit the monitoring optical signal o14f, whose wavelength belongs to the second band, to the optical monitoring device 12.

[0219] For example, Figures 17 to 19 In the communication device 10 shown, the sensor 13 and the signal transmission component 30 can be integrated together, and the integrated device is a sensing component.

[0220] In some embodiments, refer to Figure 20 As shown, Figure 20 It shows Figure 9 or Figure 13 Another structural schematic diagram of the communication device 10 shown, in Figure 20 In the communication device 20 shown, the signal transmission component 40 includes a beam splitter 41, a filter 42, and a filter 43. Filter 42 is also referred to as the first filter, and filter 43 is also referred to as the second filter. The common port m of beam splitter 41 is connected to the first common port of signal transmission component 40. The beam splitting port n1 of beam splitter 41 is connected to the transmission port h7 of filter 42. The transmission port h3 of filter 42 is the first branch port of signal transmission component 40. The beam splitting port n2 of beam splitter 41 is connected to the transmission port h8 of filter 43. The transmission port h4 of filter 43 is the second branch port of signal transmission component 40. The passband wavelength range of filter 42 and filter 43 do not overlap. The beam splitter 41’s beam splitting port n1 is also called the first beam splitting port, the beam splitter 41’s beam splitting port n2 is also called the second beam splitting port, the filter 42’s transmission port h7 is also called the first transmission port, the filter 42’s transmission port h3 is also called the second transmission port, the filter 43’s transmission port h8 is also called the third transmission port, and the filter 43’s transmission port h4 is also called the fourth transmission port.

[0221] For example, assuming the passband wavelength range of filter 42 is [λe, λf], then the wavelength range of the optical signal transmitted through transmission port h3 is [λe, λf]. Assuming the passband wavelength range of filter 43 is [λg, λh], then the wavelength range of the optical signal transmitted through transmission port h4 is [λg, λh]. Specifically, beam splitter 41 receives the first optical signal through common port m, divides the first optical signal into a first part and a second part, transmits the first part of the optical signal to filter 42 through beam splitter port n1 of beam splitter 41, and transmits the second part of the optical signal to filter 43 through beam splitter port n2 of beam splitter 41. Filter 42 is used to output the portion of the first part of the optical signal with wavelengths belonging to [λe, λf]; filter 43 is used to output the portion of the second part of the optical signal with wavelengths belonging to [λg, λh]. Signal transmission is also normal in the reverse direction. In some embodiments, the ratio of the first part of the optical signal to the second part of the optical signal is 50:50. It can be seen that... Figure 20 In the signal transmission component 40 shown, the portion of the optical signal with wavelengths belonging to [λe, λf] received at the common port m can be output through the transmission port h3, the portion of the optical signal with wavelengths belonging to [λg, λh] received at the common port m can be output through the transmission port h4, the optical signal with wavelengths belonging to [λe, λf] received at the transmission port h3 can be output through the common port m, and the optical signal with wavelengths belonging to [λg, λh] received at the transmission port h4 can be output through the common port m.

[0222] exist Figure 20 In the communication device 20 shown, sensor 23 is connected to the transmission port h3 of filter 42, optical monitoring device 22 is connected to the transmission port h4 of filter 43, common port m of optical splitter 41 is connected to branch port a7 of wavelength division multiplexer 21, and common port b2 of wavelength division multiplexer 21 is connected to transmission optical fiber 30.

[0223] Compared to Figure 9 The communication device 20 shown is in Figure 20 In the communication device 20 shown, the passband wavelength range of the filter 42 is the first band, so that the wavelength of the optical signal transmitted by the transmission port h3 of the filter 42 belongs to the first band, and the passband wavelength range of the filter 43 is the second band, so that the wavelength of the optical signal transmitted by the transmission port h4 of the filter 43 belongs to the second band.

[0224] Compared to Figure 9 The communication device 20 shown is in Figure 20 In the communication device 20 shown, the signal transmission component 40 implements... Figure 9The wavelength division multiplexer 24 shown in the diagram functions as follows: For example, sensor 23 outputs a transmitted optical signal o22; optical monitoring device 22 outputs a monitoring optical signal o21 to signal transmission component 40. Signal transmission component 40 receives the transmitted optical signal o22 and the monitoring optical signal o21, combines the transmitted optical signal o22 and the monitoring optical signal o21, and outputs a combined optical signal o20, wherein the wavelength of the transmitted optical signal o22 is different from the wavelength of the monitoring optical signal o21. The combined optical signal o20 includes both the transmitted optical signal o22 and the monitoring optical signal o21, indicating that signal transmission component 40 transmits both the transmitted optical signal o22 and the monitoring optical signal o21 to wavelength division multiplexer 21. Specifically, the filter 42 in the signal transmission component 40 is used to receive the transmitted optical signal o22 and transmit the transmitted optical signal o22 to the optical splitter 41. The filter 43 is used to receive the monitoring optical signal o21 and transmit the monitoring optical signal o21 to the optical splitter 41. The optical splitter 41 combines the transmitted optical signal o22 and the monitoring optical signal o21 and outputs the combined optical signal o20 to the wavelength division multiplexer 21.

[0225] For example, wavelength division multiplexer 21 is also used to receive detection optical signal o22f and transmit detection optical signal o22f to signal transmission component 40 through branch port a7; signal transmission component 40 is also used to transmit detection optical signal o22f with wavelength belonging to the first band to sensor component 23.

[0226] For example, during the process of the optical monitoring device 22 outputting the monitoring optical signal o23, the signal transmission component 40 is used to receive the transmitted optical signal o22, receive the monitoring optical signal o23, and combine the transmitted optical signal o22 and the monitoring optical signal o23 to output the combined optical signal o20. The combined optical signal o20 includes the transmitted optical signal o22 and the monitoring optical signal o23, which means that the signal transmission component 40 transmits the transmitted optical signal o22 and the monitoring optical signal o23 to the wavelength division multiplexer 21. The wavelength division multiplexer 21 is also used to receive the monitoring optical signal o23f and transmit the monitoring optical signal o23f to the signal transmission component 40 through the branch port a7; the signal transmission component 40 is also used to transmit the monitoring optical signal o23f, whose wavelength belongs to the second band, to the optical monitoring device 22.

[0227] In some embodiments, refer to Figure 21 As shown, Figure 21 It shows Figure 10 or Figure 14 Another structural schematic diagram of the communication device 20 shown, wherein, Figure 21 The signal transmission component 40 shown is... Figure 20 The structure and connection method of the signal transmission component 40 shown are the same, and will not be described in detail here. The difference is that... Figure 20 The first transmission port of the optical monitoring device 22 shown is the transmit port (Tx). Figure 21 The first transmission port of the optical monitoring device 12 shown is the receiving port (Rx).

[0228] Compared to Figure 10 The communication device 20 shown is in Figure 21 In the communication device 20 shown, the signal transmission component 40 implements... Figure 10 The wavelength division multiplexer 24 shown has the following functions. For example, sensor 23 is used to output transmitted optical signal o22; signal transmission component 40 is used to transmit transmitted optical signal o22 with wavelength belonging to the first band to wavelength division multiplexer 21.

[0229] For example, wavelength division multiplexer 21 is also used to receive detection optical signal o22f and transmit detection optical signal o22f to signal transmission component 40 through branch port a7; signal transmission component 40 is also used to transmit detection optical signal o22f with wavelength belonging to the first band to sensor component 23.

[0230] For example, wavelength division multiplexer 21 is also used to receive multiplexed optical signal o10 through common port b2, and transmit monitoring optical signal o12 in multiplexed optical signal o10 to signal transmission component 40 through branch port a7. Signal transmission component 40 is used to transmit monitoring optical signal o12 with wavelength belonging to the second band to optical monitoring device 22.

[0231] In some embodiments, refer to Figure 22 As shown, Figure 22 It shows Figure 11 or Figure 12 or Figure 15 or Figure 16 Another structural schematic diagram of the communication device 10 shown, and Figure 11 and Figure 15 The communication device 20 shown does not include the optical monitoring device 25. Figure 12 and Figure 16 The communication device 20 shown includes an optical monitoring device 25.

[0232] in, Figure 22 The signal transmission component 40 shown is... Figure 20 The signal transmission component 40 shown has the same structure. Figure 22 In the communication device 20 shown, sensor 23 is connected to the transmission port h3 of filter 42, optical monitoring device 22 is connected to the transmission port h4 of filter 43, common port m of optical splitter 41 is connected to branch port a7 of wavelength division multiplexer 21, and common port b2 of wavelength division multiplexer 21 is connected to transmission optical fiber 30. Figure 22 The optical monitoring device 22 shown includes a BIDI optical device.

[0233] Compared to Figure 11The communication device 20 shown is in Figure 22 In the communication device 20 shown, the signal transmission component 40 implements... Figure 11 The wavelength division multiplexer 24 shown in the diagram functions as follows: For example, sensor 23 outputs a transmitted optical signal o22; optical monitoring device 22 outputs a monitoring optical signal o21 to signal transmission component 40. Signal transmission component 40 receives the transmitted optical signal o22 and the monitoring optical signal o21, combines the transmitted optical signal o22 and the monitoring optical signal o21, and outputs a combined optical signal o29, wherein the wavelength of the transmitted optical signal o22 is different from the wavelength of the monitoring optical signal o21. The combined optical signal o29 includes both the transmitted optical signal o22 and the monitoring optical signal o21, indicating that signal transmission component 40 transmits both the transmitted optical signal o22 and the monitoring optical signal o21 to wavelength division multiplexer 21. For example, wavelength division multiplexer 21 is also used to receive a detection optical signal o22f and transmit the detection optical signal o22f to signal transmission component 40 through branch port a7; signal transmission component 40 is also used to transmit the detection optical signal o22f, whose wavelength belongs to the first band, to sensor 23. For example, wavelength division multiplexer 21 is used to receive multiplexed optical signal o10 through common port b2, and transmit monitoring optical signal o12 in multiplexed optical signal o10 to signal transmission component 40 through branch port a7. Signal transmission component 40 is used to transmit monitoring optical signal o12 with wavelength belonging to the second band to optical monitoring device 22.

[0234] For example, during the process of the optical monitoring device 22 outputting the monitoring optical signal o23, the signal transmission component 40 is used to receive the transmitted optical signal o22 through the branch port h3 and the monitoring optical signal o23 through the branch port h4, and then combine the transmitted optical signal o22 and the monitoring optical signal o23 to output the combined optical signal o20. The combined optical signal o20 includes the transmitted optical signal o22 and the monitoring optical signal o23, which means that the signal transmission component 40 transmits the transmitted optical signal o22 and the monitoring optical signal o23 to the wavelength division multiplexer 21. The wavelength division multiplexer 21 is also used to receive the monitoring optical signal o23f and transmit the monitoring optical signal o23f to the signal transmission component 40 through the branch port a7; the signal transmission component 40 is also used to transmit the monitoring optical signal o23f, whose wavelength belongs to the second band, to the optical monitoring device 22.

[0235] For example, Figures 20 to 22 In the communication device 20 shown, the sensor 23 and the signal transmission component 40 can be integrated together, and the integrated device is the sensing component.

[0236] 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 communication device, characterized by include: The system comprises a first wavelength division multiplexer, a first optical monitoring device, a sensor device, and a signal transmission component; the signal transmission component includes a first common port, a first branch port, and a second branch port, wherein the wavelength range of the optical signal transmitted by the first branch port does not overlap with the wavelength range of the optical signal transmitted by the second branch port, the first common port is connected to the first branch port, and the first common port is connected to the second branch port. The sensor is connected to the first branch port of the signal transmission component, the first optical monitoring device is connected to the second branch port of the signal transmission component, the first common port of the signal transmission component is connected to the third branch port of the first wavelength division multiplexer, and the second common port of the first wavelength division multiplexer is connected to the transmission optical fiber.

2. The communication device according to claim 1, characterized in that, The wavelength of the optical signal transmitted by the sensor belongs to the first band; The first transmission port of the first optical monitoring device is connected to the second branch port, and the wavelength of the optical signal transmitted by the first transmission port belongs to the second band; the first band and the second band do not overlap. The wavelength of the optical signal transmitted at the first branch port belongs to the first band, the optical signal transmitted at the second branch port belongs to the second band, and the wavelength of the optical signal transmitted at the third branch port belongs to the third band, which includes the first band and the second band.

3. The communication device according to claim 2, characterized in that, The sensor is used to output a transmitted optical signal, which is a coherent pulsed optical signal, and the wavelength of the transmitted optical signal belongs to the first band. The signal transmission component is used to transmit the transmitted optical signal to the first wavelength division multiplexer; The first wavelength division multiplexer is used to transmit the transmitted optical signal to the transmission optical fiber; The first wavelength division multiplexer is further configured to receive a detection optical signal transmitted to the first wavelength division multiplexer via the transmission optical fiber, and transmit the detection optical signal to the signal transmission component; wherein the transmission optical signal is scattered after being transmitted through the transmission optical fiber to obtain the detection optical signal, and the wavelength of the detection optical signal belongs to the first wavelength band; The signal transmission component is also used to transmit the detection optical signal to the sensor device; The sensor is also used to determine the vibration information of the surrounding environment of the transmission optical fiber on the transmission optical fiber based on the detected optical signal.

4. The communication device according to claim 2 or 3, characterized in that, The second transmission port of the first optical monitoring device is connected to the fourth branch port of the first wavelength division multiplexer; The wavelength of the optical signal transmitted through the second transmission port belongs to the fourth band; the first band and the fourth band do not overlap, and the second band and the fourth band do not overlap. The wavelength of the optical signal transmitted at the fourth branch port belongs to the fourth band.

5. The communication device according to claim 4, characterized in that, The first optical monitoring device is used to output a first monitoring optical signal to the signal transmission component. The first monitoring optical signal carries first overhead information of the communication device, and the wavelength of the first monitoring optical signal belongs to the second band. The signal transmission component is used to transmit the first monitoring optical signal to the first wavelength division multiplexer; The first wavelength division multiplexer is used to transmit the first monitoring optical signal to the transmission optical fiber; The first wavelength division multiplexer is further configured to receive a second monitoring optical signal transmitted to the first wavelength division multiplexer via the transmission optical fiber, and transmit the second monitoring optical signal to the first optical monitoring device; wherein the wavelength of the second monitoring optical signal belongs to the fourth band; the second monitoring optical signal carries second overhead information of other communication devices, and the other communication devices are connected to the communication device via the transmission optical fiber; The first optical monitoring device is further configured to determine the second overhead information based on the second monitoring optical signal.

6. The communication device according to claim 4, characterized in that, The first optical monitoring device is used to output a first monitoring optical signal to the first wavelength division multiplexer. The first monitoring optical signal carries the first overhead information of the communication device, and the wavelength of the first monitoring optical signal belongs to the fourth band. The first wavelength division multiplexer is used to transmit the first monitoring optical signal to the transmission optical fiber; The first wavelength division multiplexer is further configured to receive a second monitoring optical signal transmitted to the first wavelength division multiplexer via the transmission optical fiber, and transmit the second monitoring optical signal to the signal transmission component; wherein the wavelength of the second monitoring optical signal belongs to the second band; the second monitoring optical signal carries second overhead information of other communication devices, and the other communication devices are connected to the communication device via the transmission optical fiber; The signal transmission component is also used to transmit the second monitoring optical signal to the first optical monitoring device; The first optical monitoring device is further configured to determine the second overhead information based on the second monitoring optical signal.

7. The communication device according to claim 6, characterized in that, The first optical monitoring device is used to output a third monitoring optical signal to the first wavelength division multiplexer. The third monitoring optical signal is a pulsed optical signal, and the wavelength of the third monitoring optical signal belongs to the fourth band. The first wavelength division multiplexer is used to transmit the third monitoring optical signal to the transmission optical fiber; The first wavelength division multiplexer is used to receive a fourth monitoring optical signal transmitted to the first wavelength division multiplexer through the transmission optical fiber, and to transmit the fourth monitoring optical signal to the first optical monitoring device; wherein, the fourth monitoring optical signal is obtained by scattering after the third monitoring optical signal is transmitted through the transmission optical fiber, and the wavelength of the fourth monitoring optical signal belongs to the fourth band. The first optical monitoring device is also used to determine information about the fault point of the transmission optical fiber based on the fourth monitoring optical signal.

8. The communication device according to claim 2 or 3, characterized in that, The first optical monitoring device is used to output a first monitoring optical signal to the signal transmission component. The first monitoring optical signal carries first overhead information of the communication device, and the wavelength of the first monitoring optical signal belongs to the second band. The signal transmission component is used to transmit the first monitoring optical signal to the first wavelength division multiplexer; The first wavelength division multiplexer is used to transmit the first monitoring optical signal to the transmission optical fiber; The first wavelength division multiplexer is further configured to receive a second monitoring optical signal transmitted to the first wavelength division multiplexer via the transmission optical fiber, and transmit the second monitoring optical signal to the signal transmission component; wherein the wavelengths of the first monitoring optical signal and the second monitoring optical signal are different, and the wavelength of the second monitoring optical signal belongs to the second band; the second monitoring optical signal carries second overhead information of other communication devices, and the other communication devices are connected to the communication device via the transmission optical fiber; The signal transmission component is also used to transmit the second monitoring optical signal to the first optical monitoring device; The first optical monitoring device is further configured to determine the second overhead information based on the second monitoring optical signal.

9. The communication device according to claim 2 or 3, characterized in that, The first optical monitoring device is used to output a third monitoring optical signal to the signal transmission component. The third monitoring optical signal is a pulsed optical signal, and the wavelength of the third monitoring optical signal belongs to the second band. The signal transmission component is used to transmit the third monitoring optical signal to the first wavelength division multiplexer; The first wavelength division multiplexer is used to transmit the third monitoring optical signal to the transmission optical fiber; The first wavelength division multiplexer is further configured to receive a fourth monitoring optical signal transmitted to the first wavelength division multiplexer through the transmission optical fiber, and transmit the fourth monitoring optical signal to the signal transmission component; wherein the third monitoring optical signal is transmitted through the transmission optical fiber and then scattered to obtain the fourth monitoring optical signal, and the wavelength of the fourth monitoring optical signal belongs to the second wavelength band; The signal transmission component is also used to transmit the fourth monitoring optical signal to the first optical monitoring device; The first optical monitoring device is also used to determine information about the fault point of the transmission optical fiber based on the fourth monitoring optical signal.

10. The communication device according to claim 8 or 9, characterized in that, The communication equipment further includes a second optical monitoring device, which is connected to the fourth branch port of the first wavelength division multiplexer; the wavelength of the optical signal transmitted by the second optical monitoring device belongs to the fourth band. The wavelength of the optical signal transmitted at the fourth branch port belongs to the fourth band.

11. The communication device according to claim 10, characterized in that, When the first optical monitoring device outputs the first monitoring optical signal and receives the second monitoring optical signal; The second optical monitoring device is also used to output a third monitoring optical signal to the first wavelength division multiplexer, wherein the third monitoring optical signal is a pulsed optical signal and the wavelength of the third monitoring optical signal belongs to the fourth band. The first wavelength division multiplexer is used to transmit the third monitoring optical signal to the transmission optical fiber; The first wavelength division multiplexer is further configured to receive a fourth monitoring optical signal transmitted to the first wavelength division multiplexer through the transmission optical fiber, and transmit the fourth monitoring optical signal to the second optical monitoring device; wherein the third monitoring optical signal is transmitted through the transmission optical fiber and then scattered to obtain the fourth monitoring optical signal, and the wavelength of the fourth monitoring optical signal belongs to the fourth band; The second optical monitoring device is also used to determine information about the fault point of the transmission optical fiber based on the fourth monitoring optical signal.

12. The communication device according to claim 10, characterized in that, When the first optical monitoring device outputs the third monitoring optical signal and receives the fourth monitoring optical signal; The second optical monitoring device is used to output a first monitoring optical signal to the first wavelength division multiplexer. The first monitoring optical signal carries the first overhead information of the communication device, and the wavelength of the first monitoring optical signal belongs to the fourth band. The first wavelength division multiplexer is used to transmit the first monitoring optical signal to the transmission optical fiber; The first wavelength division multiplexer is further configured to receive a second monitoring optical signal transmitted to the first wavelength division multiplexer via the transmission optical fiber, and transmit the second monitoring optical signal to the second optical monitoring device; wherein the wavelengths of the first monitoring optical signal and the second monitoring optical signal are different, and the wavelength of the second monitoring optical signal belongs to the fourth band; the second monitoring optical signal carries second overhead information of other communication devices, and the other communication devices are connected to the communication device via the transmission optical fiber; The second optical monitoring device is further configured to determine the second overhead information based on the second monitoring optical signal.

13. The communication device according to any one of claims 1-12, characterized in that, The signal transmission component is a second wavelength division multiplexer; Alternatively, the signal transmission component includes a beam splitter, a first filter, and a second filter; the common port of the beam splitter is the first common port, the first beam splitting port of the beam splitter is connected to the first transmission port of the first filter, the second transmission port of the first filter is the first branch port, the second beam splitting port of the beam splitter is connected to the third transmission port of the second filter, the fourth transmission port of the second filter is the second branch port, and the passband wavelength range of the first filter does not overlap with the passband wavelength range of the second filter.

14. The communication device according to claim 13, characterized in that, The passband wavelength range of the first filter is the first band, and the passband wavelength range of the second filter is the second band.

15. A sensing assembly comprising: The sensing component is disposed in the communication device, which includes a first wavelength division multiplexer and a first optical monitoring device. The sensing component includes: a sensor and a signal transmission component; the signal transmission component includes a first common port, a first branch port and a second branch port, wherein the wavelength range of the optical signal transmitted by the first branch port does not overlap with the wavelength range of the optical signal transmitted by the second branch port, the first common port is connected to the first branch port and the first common port is connected to the second branch port; The sensor is connected to the first branch port of the signal transmission component, the second branch port of the signal transmission component is connected to the first optical monitoring device, the first common port of the signal transmission component is connected to the third branch port of the first wavelength division multiplexer, and the second common port of the first wavelength division multiplexer is connected to the transmission optical fiber.

16. The sensing component according to claim 15, characterized in that, The wavelength of the optical signal transmitted by the sensor belongs to the first band; The first transmission port of the first optical monitoring device is connected to the second branch port, and the wavelength of the optical signal transmitted by the first transmission port belongs to the second band; the first band and the second band do not overlap. The wavelength of the optical signal transmitted at the first branch port belongs to the first band, the optical signal transmitted at the second branch port belongs to the second band, and the wavelength of the optical signal transmitted at the third branch port belongs to the third band, which includes the first band and the second band.

17. The sensing component according to claim 15, characterized in that, The signal transmission component is a second wavelength division multiplexer; Alternatively, the signal transmission component includes a beam splitter, a first filter, and a second filter; the common port of the beam splitter serves as the first common port, the first beam splitting port of the beam splitter is connected to the first transmission port of the first filter, the second transmission port of the first filter serves as the first branch port, the second beam splitting port of the beam splitter is connected to the third transmission port of the second filter, the fourth transmission port of the second filter serves as the second branch port, and the passband wavelength range of the first filter does not overlap with the passband wavelength range of the second filter.

18. An optical fiber communication system, comprising: It includes a transmission optical fiber and at least one communication device as described in any one of claims 1-14; the at least one communication device includes a first communication device and a second communication device; The first communication device and the second communication device are connected via the transmission optical fiber.

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