Communication node, optical communication network and communication method

Abstract

Relates to a communication node, an optical communication network and a communication method, and relates to the field of optical communication, an amplifier in the communication node can be switched to an open state based on a control signal sent by a detection device, so that the amplifier is automatically opened after an optical fiber is repaired, and transmission of a service signal can be recovered. The communication node structurally comprises a first OTN single board and a first amplifier connected with the first OTN single board, the first amplifier is connected between a first end of an optical fiber and the first OTN single board, and the first end of the optical fiber is further connected with a detection device. Functionally, the optical fiber fault detection device comprises: a first amplifier configured to receive a first control signal sent by a detection device, the first control signal being used for indicating that there is no fault point on an optical fiber within a predetermined distance range from the first amplifier; and the first amplifier is switched to an open state based on the first control signal, and in the open state, the first amplifier is used for transmitting a service optical signal with the first OTN single board. The embodiment of the invention is applied to optical communication.

Description

Technical Field

[0001] This application relates to the field of optical communication, and more particularly to a communication node, an optical communication network, and a communication method. Background Technology

[0002] Optical communication networks are communication networks that use light waves as carriers. They have advantages such as large transmission capacity and long transmission distance, and therefore can be applied to different scenarios.

[0003] In some long-distance optical communication networks, the transmission distance can be extended even without active equipment deployed in the communication link. Therefore, they are commonly used in long-distance transmission scenarios such as between islands, sparsely populated areas (e.g., Gobi Desert, forests), and ultra-high voltage or extra-high voltage power transmission networks. However, ordinary optical power amplifiers (BAs) are no longer sufficient for long-distance transmission scenarios, necessitating the use of Raman fiber amplifiers (RFAs, including Raman boards) to further extend the transmission distance. Since Raman fiber amplifiers amplify service signals through the Raman effect, they suffer from excessively high emitted optical power. According to laser safety classification standards (referencing IEC 60825-2 safety specification), when the output optical power of a laser exceeds 21.3 dBm, intelligent power adjustment (IPA) is required to promptly shut down the laser. Specifically, the IPA function can promptly shut down the laser on the faulty fiber (including one or more amplifiers on the fiber, such as ordinary optical power amplifiers, Raman amplifiers, and power amplifiers (also known as preamplifiers, PAs)) when a fiber optic cable in an optical communication network fails (e.g., fiber breakage), preventing injury to maintenance personnel (especially to the eyes) from exposed laser light and ensuring the overall optical power of the fiber remains at a safe level. Thus, the IPA function addresses the safety issues caused by lasers after a failure. However, a new problem arises: after the faulty fiber is repaired, the laser remains off, and service signals cannot be directly restored.

[0004] Based on the above, the industry urgently needs a technical solution that allows all amplifiers to automatically turn on after fiber optic repair is completed (while all amplifiers remain off), so that service signals can be automatically restored (transmitted). Summary of the Invention

[0005] This application provides a communication node, an optical communication network, and a communication method. The amplifier in the communication node can switch to an open state based on a control signal sent by a detection device, so that the amplifier can be automatically turned on after the optical fiber is repaired, thereby ensuring that the service signal can be restored.

[0006] Firstly, a communication node is provided. Structurally, the communication node includes: a first OTN board and a first amplifier connected to the first OTN board. The first amplifier is connected between a first end of an optical fiber and the first OTN board, and the first end of the optical fiber is also connected to a detection device. Functionally, it includes: the first amplifier, configured to receive a first control signal sent by the detection device, the first control signal indicating that there are no fault points on the optical fiber within a predetermined distance from the first amplifier; and the first amplifier, switching to an on state based on the first control signal, wherein, in the on state, the first amplifier is used to transmit service optical signals with the first OTN board.

[0007] In the above scheme, the amplifier (i.e., the first amplifier) ​​in the communication node can switch to the on state based on the control signal (i.e., the first control signal) sent by the detection device. The detection device in the communication node can determine whether there is a fault point on the optical fiber within a predetermined distance from the amplifier. When it is determined that there is no fault point on the optical fiber within the predetermined distance from the first amplifier, the first control signal is sent to the first amplifier. In one possible implementation, if an optical fiber in the optical communication network fails (a fault point exists), the transmission of service optical signals will be affected (transmission interruption, service signal loss, etc.). After the optical fiber is repaired, the service optical signal transmission also needs to be restored promptly. Through the above scheme, after the optical fiber is repaired, the first amplifier in the communication node can automatically switch to the on state based on the first control signal sent by the detection device, thereby restoring the transmission of service optical signals. Optionally, the communication node includes one or more amplifiers; the embodiments of this application do not limit this. In this way, the communication node in the above scheme can detect whether there is an interruption (fault point) in the optical fiber near the communication node (within a predetermined distance), and thus determine whether it is necessary to switch its own amplifier (i.e., one or more amplifiers in the communication node) to be turned on in order to restore the transmission of the service optical signal. Of course, the above communication node can also be applied to long-distance communication scenarios, and should not be construed as limiting the embodiments of this application. In one possible implementation, if the amplifier is turned on directly when the fault point on the optical fiber is not repaired, and the distance between the fault point and the amplifier is relatively close, the optical power of the service optical signal at the fault point location is relatively high, which will cause harm to the maintenance personnel repairing the fault point. However, the above scheme can control the amplifier in the communication node to be turned on when it is determined that there is no fault point within the predetermined distance range. Since there is no fault point within the predetermined range at this time, directly controlling the amplifier to be turned on can avoid the laser from causing harm to the human body. Alternatively, if the distance between the fault point and the amplifier is relatively far, the optical power of the service optical signal reaching the fault point is small enough due to transmission loss, and the above scheme can also effectively avoid the laser from causing harm to the human body by controlling the amplifier to be turned on. At the same time, it can significantly reduce the difficulty and cost of operation and maintenance of optical communication networks. Furthermore, the above solution can cover ultra-long-distance (400 km or more) communication scenarios, and has higher compatibility.

[0008] In one possible implementation, the communication node includes a detection device; specifically, the detection device is used to output a detection optical signal to the optical fiber and receive a return optical signal that is transmitted through the optical fiber and output to the first amplifier; based on the detection optical signal and the return optical signal, when the detection device determines that there is no fault point on the optical fiber within a predetermined distance from the first amplifier, it sends a first control signal to the first amplifier.

[0009] In the above scheme, the detection device in the communication node can output an optical signal (i.e., a detection optical signal) to the optical fiber. This detection optical signal can detect the transmission status of the optical fiber (e.g., whether there is a fault point within a predetermined distance). Then, the detection device receives the return optical signal after the detection optical signal has been transmitted through the optical fiber and outputs it to the amplifier (i.e., the first amplifier). Optionally, based on the detection optical signal and the return optical signal, the detection device can determine whether there is a fault point on the optical fiber within a predetermined distance from the first amplifier. Further, when the detection device determines that there is no fault point on the optical fiber within a predetermined distance from the first amplifier, it sends a first control signal to the first amplifier. Based on the first control signal, the first amplifier switches to the on state. Optionally, the detection device can determine whether there is a fault point on the optical fiber, or the distance between a fault point and the amplifier, by detecting the optical power of the detection optical signal and the optical power of the return optical signal. According to laser safety standards (International Electrotechnical Commission (IEC) 60825-2 safety specification), optical power less than 21.3 dBm generally poses less risk of human injury. Therefore, after the optical signal output from a laser (including optical amplifiers, Raman amplifiers, etc.) has traveled a certain distance (i.e., a predetermined distance) along the optical fiber, the optical power will decrease to a safe value, at which point the impact of the laser on human safety is controllable. Based on this, a predetermined range can typically be determined based on the output optical power of the amplifier on the optical fiber to ensure that the optical power outside the predetermined distance will not cause harm to the human body. Based on this, the communication node in the above scheme can detect the optical fiber transmission status within the range that could cause harm to the human body through a detection device; based on a control signal, the amplifier can automatically switch to on, and the entire detection process does not require manual intervention, thus avoiding harm to the human body. Of course, the detection device can also determine the transmission status of the optical fiber based on the detected optical signal and the returned optical signal through other possible methods; the embodiments of this application do not limit this. It is easy to understand that the detection device in the above scheme is external to the amplifier and connected to the amplifier. This should not be used to limit the location of the amplifier in the communication node or the specific connection relationship. Based on the above scheme, the detection device in the communication node can output a detection optical signal and determine the transmission status of the optical fiber within a predetermined distance range based on the detection optical signal and the return optical signal. Furthermore, when it is determined that there is no fault point within the predetermined range, the amplifier can automatically switch to on by sending a control signal.

[0010] In one possible implementation, the detection device is disposed within the first amplifier; the first amplifier is specifically used to output a detection optical signal to the optical fiber; the detection device is used to receive the return optical signal that is transmitted through the optical fiber and then output to the first amplifier; based on the return optical signal, the detection device determines that there are no fault points on the optical fiber within a predetermined distance from the first amplifier.

[0011] In the above scheme, the detection device in the communication node is located within the amplifier (i.e., the first amplifier), meaning it is integrated within the first amplifier. Specifically, the first amplifier in the communication node can output a detection optical signal to the optical fiber for detecting the transmission status of the optical fiber. The detection device located within the first amplifier can receive the return optical signal output to the first amplifier after the optical fiber transmits the detection optical signal; and then, based on the received detection optical signal, determine whether there is a fault point within a predetermined distance range on the optical fiber from the first amplifier. In one possible implementation, if a fault point exists within the predetermined distance on the optical fiber, the detection optical signal will be reflected (an event) at the fault point during its transmission along the optical fiber. Then, based on the time of the received return optical signal and the refractive index of the optical fiber, the detection device can determine the distance between the fault point and the output position of the detection optical signal (i.e., the position of the amplifier), thereby determining whether the distance between the fault point on the optical fiber and the amplifier is within the predetermined distance range. Further, when the detection device determines that there is no fault point within the predetermined distance range on the optical fiber from the amplifier, it sends a control signal to the amplifier, enabling the amplifier to switch to the on state. In this way, the amplifier in the communication node can output a detection optical signal for detecting the optical fiber. The detection device integrated within the amplifier can detect the transmission status of the optical fiber based on the received return optical signal, and then determine whether there is a fault point on the optical fiber within a predetermined distance from the amplifier. Based on the communication node in the above scheme, the detection device integrated within the amplifier can determine the transmission status of the optical fiber within a predetermined distance from the amplifier based on the received return optical signal.

[0012] In one possible implementation, the first amplifier is configured to receive a second control signal sent by the detection device, the second control signal indicating that there is a fault point on the optical fiber within a predetermined distance from the first amplifier; the first amplifier switches to a closed state based on the second control signal.

[0013] In the above scheme, the amplifier (i.e., the first amplifier) ​​in the communication node can switch to a shutdown state based on the second control signal sent by the detection device. For example, when the detection device determines that there is a fault point on the optical fiber within a predetermined distance from the first amplifier, it will send the second control signal to the first amplifier, instructing it to switch to a shutdown state. Therefore, based on the detection result (a fault point on the optical fiber within a predetermined distance from the amplifier), the detection device can instruct the amplifier to automatically switch to a shutdown state by sending a control signal to the amplifier. In one possible implementation, the optical power of the optical signal within the predetermined range is relatively high, and manually shutting down the amplifier could potentially cause harm to the human body. Based on the above scheme, when the communication node determines that there is a fault point on the optical fiber within a predetermined distance from the amplifier, it does not need to manually shut down the laser; it can control the amplifier to automatically shut down through the control signal sent by the detection device, thereby avoiding potential harm to the human body and effectively ensuring the security of the optical communication network.

[0014] In one possible implementation, the detection device includes an optical time domain reflectometer (OTDR).

[0015] Therefore, in the above solutions, the detection device in the other solutions can be an OTDR. Generally, an OTDR can send a detection optical signal to the optical fiber and detect the transmission status of the optical fiber by transmitting the detection optical signal back through the optical fiber. For example, according to the above solutions, when the OTDR is externally placed in the amplifier, it can detect the optical fiber (whether there is a fault point, etc.) and automatically turn on the amplifier by sending a control signal to the amplifier. As another example, when the OTDR is integrated into the amplifier, it can detect the optical fiber (whether there is a fault point, etc.) based on the detection optical signal output from the amplifier to the optical fiber and automatically turn on the amplifier by sending a control signal to the amplifier. Optionally, the detection device can be implemented by other devices or circuits that can achieve similar functions to an OTDR. The embodiments of this application do not limit the type and form of the detection device. For example, the detection device can be implemented by an in-line OTDR detection board. Based on the above solutions, the OTDR in the communication node provided by the embodiments of this application enables more flexible deployment methods and locations for the detection device, and improves compatibility.

[0016] In one possible implementation, the first amplifier includes at least one of the following: a Raman fiber amplifier, an optical power amplifier BA.

[0017] In the above scheme, the amplifier in the communication node includes a Raman amplifier (referred to as a Raman optical amplifier). Typically, in optical communication networks with long transmission distances (e.g., greater than 400km), sufficient amplifiers need to be deployed to extend the transmission distance. Generally, ordinary optical amplifiers cannot meet the requirements of ultra-long transmission distances, requiring Raman amplifiers to further extend the transmission distance. Specifically, Raman amplifiers amplify service signals through the Raman effect, and their high optical power enables further amplification of optical signals. Optionally, the Raman amplifier can be a Raman board, Raman remote pump, etc. The embodiments of this application do not limit the device form of the Raman amplifier. Of course, the above is only one possible scenario of an optical communication network and should not be construed as limiting the embodiments of this application. Based on the above scheme, the Raman amplifier in the communication node provided by the embodiments of this application can further amplify the optical signal, enabling the embodiments of this application to be applied to ultra-long-distance transmission scenarios in optical communication networks and other different scenarios, with higher compatibility.

[0018] In a second aspect, an optical communication network is provided. The optical communication network includes: a first communication node, a second communication node, and an optical fiber; wherein the first communication node includes the communication node described in any one of the first aspects; the first communication node is used to connect to a first end of the optical fiber, and the second communication node is connected to a second end of the optical fiber.

[0019] In one possible implementation, the second communication node includes: a second OTN board and a second amplifier, the second amplifier being connected between the second end of the optical fiber and the second OTN board; the second communication node is used to receive service optical signals transmitted by the first communication node through the second OTN board, the service optical signals carrying service data; the second communication node is also used to control the second amplifier in the second communication node to switch to a closed state when it is determined that the service optical signal received by the second OTN board is lost.

[0020] In the above scheme, a set (two) communication nodes (i.e., the first communication node and the second communication node) deployed in the optical communication network can serve as both transmitting and receiving devices for service optical signals. For example, the second communication node can act as a receiving device for service optical signals, and it can determine whether the service optical signal received by the second OTN board has been lost. Further, when it is determined that the service optical signal received by the second OTN board has been lost, it can control the second amplifier on its side to switch to a closed state. Optionally, the second communication node can determine whether the service optical signal has been lost based on the optical power of the service optical signal received by the second OTN board. For another example, the second communication node can also determine whether the service optical signal has been lost based on the service data carried by the service optical signal received by the second OTN board. Of course, the embodiments of this application do not limit the specific method by which the second communication node determines the transmission status of the optical fiber. In one possible implementation, the second amplifier can be a preamplifier (PA) used to amplify the optical signal (e.g., the service optical signal) received by the second communication node to ensure transmission quality. Based on the above scheme, when the communication node provided in the embodiments of this application is deployed on the receiving side (as a receiving device), it can control its own amplifier to switch to the off state when the service optical signal is determined.

[0021] In one possible implementation, the first communication node is also configured to control the first amplifier in the first communication node to switch to a shutdown state in response to the loss of the service optical signal.

[0022] Therefore, in the above scheme, a group of communication nodes deployed in the optical communication network can serve as both transmitting and receiving devices for service optical signals. For example, the first communication node, acting as a transmitting device for outputting service optical signals, can control its first amplifier to switch to a shutdown state in response to the loss of the service optical signal. Based on the above scheme, when the communication node provided in the embodiments of this application is deployed on the transmitting side (as a transmitting device), it can automatically control its amplifier to switch to a shutdown state in response to the other communication node determining that the service optical signal has been lost.

[0023] Thirdly, a communication method is provided. This communication method is applied to a communication node, which includes: a first OTN board and a first amplifier connected to the first OTN board. The first amplifier is connected between a first end of an optical fiber and the first OTN board, and the first end of the optical fiber is also connected to a detection device. The communication method includes: the communication node receiving a first control signal sent by the detection device through the first amplifier, the first control signal indicating that there are no fault points on the optical fiber within a predetermined distance from the first amplifier; and the communication node switching the first amplifier to an on state based on the first control signal, wherein, in the on state, the first amplifier is used to transmit service optical signals with the first OTN board.

[0024] In one possible implementation, the above communication method further includes: the communication node outputs a detection optical signal to the optical fiber through a detection device, and receives a return optical signal that is transmitted through the optical fiber and output to the first amplifier; when the communication node determines, based on the return optical signal, that there is no fault point on the optical fiber within a predetermined distance from the first amplifier, it sends a first control signal to the first amplifier through the detection device.

[0025] In one possible implementation, the above communication method further includes: the communication node outputs a detection optical signal to the optical fiber through a first amplifier; the communication node receives a return optical signal from the detection optical signal after it has been transmitted through the optical fiber and output to the first amplifier through a detection device; and the communication node sends a first control signal to the first amplifier through the detection device when it determines, based on the return optical signal, that there is no fault point on the optical fiber within a predetermined distance from the first amplifier.

[0026] In one possible implementation, the above communication method further includes: the communication node receiving a second control signal sent by the detection device through the first amplifier; and the communication node switching the first amplifier to a closed state based on the second control signal.

[0027] Fourthly, a computer-readable storage medium. This computer-readable storage medium stores a computer program or instructions that, when read and executed by a computer, cause the computer to perform the communication method described in any possible implementation of the third aspect.

[0028] Fifthly, a computer program product comprising instructions is provided, the computer program product including: computer program code, which, when run on a computer, enables the computer to perform the communication method as described in any possible implementation of the third aspect.

[0029] A sixth aspect provides a chip or chip system. The chip or chip system includes: processing circuitry and an input / output interface; wherein the processing circuitry is configured to perform the communication method as described in any possible implementation of the third aspect.

[0030] The technical effects of any of the possible design methods in the third to sixth aspects mentioned above can be compared with the technical effects of different design methods in the first and second aspects, and will not be elaborated here. Attached Figure Description

[0031] Figure 1 A schematic diagram illustrating an application scenario of an ultra-long-distance optical communication network provided for an embodiment of this application;

[0032] Figure 2An architecture diagram of an optical communication network provided for embodiments of this application;

[0033] Figure 3 A schematic diagram of a communication node provided for an embodiment of this application;

[0034] Figure 4 A schematic diagram illustrating a detection method provided for an embodiment of this application;

[0035] Figure 5 A schematic diagram of an optical communication network provided for an embodiment of this application;

[0036] Figure 6 A schematic diagram of a communication method provided for an embodiment of this application;

[0037] Figure 7 A flowchart illustrating a communication method provided for an embodiment of this application;

[0038] Figure 8 A schematic diagram of a communication method provided for another embodiment of this application;

[0039] Figure 9 A flowchart illustrating a communication method provided in another embodiment of this application;

[0040] Figure 10 A schematic diagram of a communication method provided in yet another embodiment of this application;

[0041] Figure 11 A flowchart illustrating a communication method provided in yet another embodiment of this application;

[0042] Figure 12 A schematic diagram of a communication method provided in yet another embodiment of this application;

[0043] Figure 13 A flowchart of a communication method provided in another embodiment of this application. Detailed Implementation

[0044] The technical solutions of 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.

[0045] 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, the terms "first," "second," etc., do not limit the quantity or order. In the embodiments of this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone, where A and B can be singular or plural.

[0046] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0047] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0048] Optical communication networks are communication networks that use light waves as carriers. They have advantages such as large transmission capacity and long transmission distance, and are therefore applicable to various scenarios. Optical communication networks can typically be classified into different types based on various classification methods.

[0049] Among them, some long-distance optical communication networks (such as ultra-long span systems, also known as ultra-long-distance networks or ultra-long-distance networks) can extend the transmission distance when no active equipment is deployed in the communication link. Therefore, they are often used in long-distance transmission scenarios such as between islands, sparsely populated areas (such as the Gobi Desert, deserts, and forests), and ultra-high voltage or extra-high voltage power transmission networks.

[0050] For example, refer to Figure 1 As shown, embodiments of this application illustrate potential application scenarios for ultra-long-haul optical communication networks (ULWC networks). Specifically, in conjunction with... Figure 1 As shown in (1), ultra-long-distance networks can be applied to cross-sea communication, that is, in scenarios where there is seawater between landmasses, communication between landmasses (i.e., cross-sea communication) can be achieved through the deployment of optical cables. Typically, in this scenario, the optical cable is placed on a submarine cable laying vessel, and then, while the vessel is slowly moving, the cable is laid flat and sunk into the seabed, enabling communication between landmasses through signal transmission via the submarine cable. Combined with... Figure 1 As shown in (2), ultra-long-distance networks can be applied to desert communication. Desert areas are sparsely populated, and long-distance signal transmission can be achieved through optical communication networks. Combined with... Figure 1As shown in (3), ultra-long-distance networks can be applied to power grid communication. Typically, power grids require signal transmission for services such as power resource deployment and power supply. Therefore, in power grid communication scenarios, deploying optical communication networks can achieve signal transmission to ensure the normal operation of power grid services.

[0051] It's easy to understand that in scenarios with long transmission distances, ordinary optical amplifiers (or simply optical amplifiers) are no longer sufficient to meet the requirements of long-distance transmission. Therefore, Raman fiber amplifiers (RFAs, or simply Raman optical amplifiers) are typically used to further extend the transmission distance.

[0052] For example, refer to Figure 2 As shown, an embodiment of this application provides an architecture diagram of an optical communication network, wherein the optical communication network can promptly shut down the laser (including all amplifiers in the optical communication network) through the IPA function. Specifically, in conjunction with... Figure 2 As shown, the optical communication network includes: two communication nodes ( Figure 2 Communication node A and communication node B), multiple optical amplifiers ( Figure 2 Amplifiers 101, 102, 103, and 104, and multiple Raman amplifiers (in the above) Figure 2 Raman amplifiers 105 and 106 (in the model).

[0053] Optionally, communication node A includes amplifiers 101 and 103, a Raman amplifier 105, a control implementation board 107, and a detection board 109. Communication node B includes amplifiers 102 and 104, a Raman amplifier 106, a control implementation board 108, and a detection board 110. In the downlink direction, communication node A in the above-mentioned optical communication network is connected to communication node B via optical fiber 1; in the uplink direction, communication node B in the above-mentioned optical communication network is connected to communication node A via optical fiber 2. Of course, in some possible examples, optical fiber 1 and optical fiber 2 can be implemented using a single optical fiber, and the embodiments of this application do not limit this.

[0054] Among them, the aforementioned multiple amplifiers (including amplifiers 101 to 104) and multiple Raman amplifiers (including Raman amplifier 105 and Raman amplifier 106) are used to amplify the optical signal, thereby increasing the transmission distance of the optical signal in the optical communication network and ensuring the transmission quality of the optical communication network.

[0055] The aforementioned communication nodes A and B can be implemented using communication equipment, communication devices, or other similar devices; this embodiment does not limit their implementation. Optionally, the communication nodes in the aforementioned optical communication network may also include more communication devices. For example, a communication node may also include an optical transmitter capable of outputting optical signals. It is easy to understand that, for ease of explanation, only [specific examples are mentioned here]. Figure 2 The architecture shown is for illustrative purposes only and should not be construed as limiting the embodiments of this application.

[0056] Generally, two communication nodes transmit services by transmitting optical signals carrying service data (called service optical signals). Specifically, in conjunction with... Figure 2 As shown, during normal transmission in this optical communication network, in the downlink direction, communication node A transmits service optical signals to communication node B along optical fiber 1. The optical signal is transmitted from the control implementation board 107 in communication node A to amplifier 101, then along optical fiber 1 to amplifier 102 in communication node B, and finally through Raman amplifier 106 to detection board 110 in communication node B. Similarly, in the uplink direction, communication node B transmits service optical signals to communication node A along optical fiber 2. The transmission process is similar to the above process and will not be repeated here.

[0057] Based on the above process, communication node A and communication node B in the optical communication network can transmit services in both the uplink and downlink directions, thus achieving communication.

[0058] In one possible implementation, a fault in the optical fiber in the aforementioned optical communication network will affect signal transmission between two communication nodes, potentially even causing a complete interruption. According to laser safety classification standards (referencing IEC 60825-2 safety specifications), an output optical power exceeding 21.3 dBm may cause harm to humans. Since Raman fiber amplifiers amplify service signals through the Raman effect, they typically emit excessively high optical power and therefore need to be shut down promptly. Therefore, an intelligent power adjustment (IPA) function is required to promptly shut down all amplifiers in the optical communication network to ensure the overall optical power of the line remains at a safe level, preventing exposure to laser light from harming maintenance personnel, especially their eyes.

[0059] For example, in combination Figure 2 As shown, a fault occurs on fiber optic cable 1 between communication node A and communication node B in the downlink direction, indicating a fault point. This causes a transmission interruption between communication node A and communication node B; the service optical signal cannot be transmitted normally from communication node A to communication node B, and communication node B will also have difficulty receiving the optical signal. At this time, multiple amplifiers used to amplify the optical signal, as well as multiple Raman amplifiers, need to be shut down.

[0060] Specifically, in the downlink direction, the detection board 110 in communication node B determines that fiber optic cable 1 is faulty based on the received service optical signal and shuts down Raman amplifiers 106, 102, and 104 within this node. In the uplink direction, the control implementation board 107 in communication node B controls communication node A to shut down amplifiers 101, 103, and Raman amplifier 105. Thus, through the IPA function, when a fiber optic cable (e.g., fiber optic cable 1) in the optical communication network fails (e.g., a fault point exists), all amplifiers on the faulty fiber can be shut down promptly to prevent exposed laser light from causing harm (especially to the eyes) to maintenance personnel.

[0061] Although the IPA function can resolve safety issues caused by laser failures, after the faulty fiber is repaired, multiple amplifiers on the fiber remain off, preventing the rapid resumption of service optical signal transmission. For example, after the fault on fiber 1 is repaired, amplifiers 101 to 104, Raman amplifier 105, and Raman amplifier 106 are all off, preventing multi-stage amplification of the service optical signal during transmission, making it difficult for the optical communication network to resume service transmission.

[0062] To address the aforementioned issues, all amplifiers in the optical communication network can typically be activated by sending management control signals. For example, this solution mainly includes two methods:

[0063] Method 1: The optical layer device sends management and control signals.

[0064] Specifically, in this method, the transmitting device (e.g., communication node A mentioned above) not only transmits service optical signals but also management control signals, enabling the management control signals and service data to be transmitted together in a single optical fiber. The management control signals have a separate wavelength and can be transmitted independently through an optical supervisory channel (OSC), without relying on amplifiers. Therefore, when a fiber optic fault is repaired, the management control signals transmitted through the OSC allow communication nodes in the optical communication network to resume communication, service transmission can be restored, and the source and destination devices (e.g., communication nodes A and B mentioned above) can then activate all amplifiers.

[0065] However, the transmission capability (expressed as optical power) of the control and management signal in the above scheme is only 45dB, and its transmission distance is less than 200 kilometers, which cannot cover application scenarios with ultra-long distances (e.g., 400 kilometers).

[0066] Method 2: Low-speed, high-sensitivity, low-speed sending and receiving.

[0067] The specific implementation scheme of this method is similar to that of the first method. However, in this scheme, the transmission rate of the control and management signal is lower, and it can be transmitted in a longer optical fiber, that is, to achieve control of amplifiers over a longer distance.

[0068] However, the control and management signal transmission capability in the above method is only 85dB, and its transmission distance can reach 350 kilometers. While this can cover some ultra-long-distance application scenarios, it cannot completely cover all application scenarios of optical communication networks. For example, it is difficult to apply to application scenarios with transmission distances greater than 400 kilometers. Furthermore, this solution requires the deployment of a separate board for the transmission and reception of management and control signals, and requires corresponding devices (such as a fiber interface unit (FIU)) to combine the management and control signals with the service signals to ensure that the management and control signals and service data can be transmitted through a single optical fiber. This will significantly increase the deployment cost of optical communication networks.

[0069] Based on the above problems, exemplarily, referring to Figure 3 As shown, an embodiment of this application provides a schematic diagram of a communication node. It should be noted that, for ease of explanation, this communication node is designated as communication node 10 in the following embodiments of this application, and this should not be construed as limiting the embodiments of this application. Specifically, in conjunction with... Figure 3 As shown, communication node 10 includes: a first OTN board ( Figure 3 The OTN board 301 in the middle, and the first amplifier connected to the first OTN board ( Figure 3 Amplifier 302 and detection device (in the middle) Figure 3 The detection device 303 is located in the optical fiber. The amplifier 302 is connected between the first end of the optical fiber and the OTN board 301, and the first end of the optical fiber is also connected to the detection device 303.

[0070] Optionally, the detection device 303 includes an optical time domain reflectometer (OTDR). In some examples, refer to... Figure 3 As shown, the detection device 303 is externally mounted on the amplifier 302. In other examples, the detection device 303 may also be integrated into the amplifier 302. The embodiments of this application do not limit the connection and positional relationship between the detection device and the amplifier.

[0071] In one possible implementation, the first amplifier (i.e., amplifier 302) includes at least one of the following: a Raman amplifier and an optical power amplifier BA.

[0072] In one possible implementation, the communication node 10 may further include more communication devices. For example, the communication node 10 may also include other types of lasers. Optionally, the communication node 10 may be implemented by communication equipment, communication devices, or other equipment types, and the embodiments of this application do not limit this. It is easy to understand that, for ease of explanation, only [the following is mentioned here]... Figure 3 The architecture shown is for illustrative purposes only and should not be construed as limiting the embodiments of this application.

[0073] In one possible implementation, a fault occurs on the optical fiber, creating a point of failure. Based on the aforementioned IPA function (see...), Figure 2 The process described above) allows communication node 10 to shut down all amplifiers within the communication node. Based on this, combined with Figure 3 As shown, amplifier 302 is configured to receive a first control signal sent by detection device 303. The first control signal indicates that there are no fault points on the optical fiber within a predetermined distance from amplifier 302. Amplifier 302 switches to an open state based on the first control signal. In the open state, amplifier 302 is used to transmit service optical signals with OTN board 301.

[0074] In one possible implementation, if the amplifier is turned on directly before the fault point on the optical fiber is repaired, and the distance between the fault point and the amplifier is relatively short, the optical power of the service optical signal at the fault point will be relatively high, which could harm the maintenance personnel repairing the fault. However, the above solution can control the amplifier in the communication node to turn on when it is determined that there is no fault point within a predetermined distance, thereby avoiding harm to the human body from the laser. Alternatively, if the distance between the fault point and the amplifier is relatively far, and the optical power of the service optical signal reaching the fault point is sufficiently low due to transmission loss, controlling the amplifier to turn on using the above solution can also effectively avoid harm to the human body from the laser. At the same time, it can significantly reduce the difficulty and cost of operation and maintenance of optical communication networks. Furthermore, the above solution can cover ultra-long-distance (400 kilometers (or kilometers, KM) and above) communication scenarios, with higher compatibility.

[0075] In one possible implementation, refer to Figure 3 As shown, the communication node 10 includes a detection device 303; the detection device 303 is specifically used to output a detection optical signal to the optical fiber and receive the return optical signal after the detection optical signal is transmitted through the optical fiber and output to the amplifier 302; based on the detection optical signal and the return optical signal, when the detection device 303 determines that there is no fault point on the optical fiber within a predetermined distance from the amplifier 302, it sends a first control signal to the amplifier.

[0076] For example, refer to Figure 4As shown, the detection device is housed within amplifier 302, meaning that detection device 303 is integrated within amplifier 302. Specifically, amplifier 302 is used to output a detection optical signal to the optical fiber; detection device 303 is used to receive the return optical signal that is transmitted through the optical fiber and then output to amplifier 302; based on the return optical signal, detection device 303 determines that there are no fault points on the optical fiber within a predetermined distance from amplifier 302.

[0077] In one possible implementation, Figure 3 The amplifier in the circuit is a Raman amplifier, and the detection device includes an OTDR. Simultaneously, combined with... Figure 4 As shown, the detection device is integrated into the amplifier. Therefore, the detection device can be an OTDR circuit integrated into the amplifier, or it can be implemented by a detection circuit integrated into the Raman amplifier. For example, Figure 4 The amplifier in the device can be a Raman amplifier. For example, it can be a Raman remote pump, a Raman circuit board, etc. It is not difficult to understand that the embodiments of this application do not limit the type or form of the detection device.

[0078] Specifically, in combination Figure 4 As shown, the amplifier (i.e., amplifier 302) outputs a pump light beam with a known power (denoted as P1, in dBm) into the optical fiber. Then, the return optical signal, transmitted through the optical fiber, is received and output to the amplifier. The detection device within the amplifier detects the optical power of the return optical signal (denoted as P2, in dBm). The return loss (RL) of the Raman amplifier is then equal to P1 - P2, in dB. Typically, if the optical fiber fails (i.e., is interrupted), the optical signal will be reflected (a reflection event) during its transmission along the fiber. Therefore, based on the return loss RL, it is possible to first determine whether a reflection (event) occurred during the transmission of the amplifier's output optical signal along the optical fiber. Furthermore, the presence or absence of a reflection event can be used to determine the transmission status of the optical fiber. Thus, the transmission status of the optical fiber can be determined through the aforementioned return loss detection method. Typically, the detectable distance for return loss detection is relatively short (within 3KM). However, this method has higher detection efficiency and can be used as a supplementary detection method to increase detection efficiency and accuracy.

[0079] In some examples, amplifier 302 is configured to receive a second control signal sent by detection device 303, indicating the presence of a fault point on the optical fiber within a predetermined distance from amplifier 302; amplifier 302 switches to a shutdown state based on the second control signal. Thus, the detection device in the communication node can control the amplifier to shut down by sending a control signal when a fault point is determined to exist within a safe standard distance. Based on this, when a fault point is determined to exist within a safe standard distance on the optical fiber, there is no need to manually shut down the laser. The above scheme enables remote control of the amplifier shutdown, thereby avoiding potential harm to the human body and effectively ensuring the security of the optical communication network.

[0080] According to laser safety classification standards, an output optical power greater than 21.3 dBm may cause harm to the human body. Furthermore, during transmission along the optical fiber, the optical power of the signal gradually decreases with increasing transmission distance. Based on this, the aforementioned predetermined distance can be defined as the transmission distance where the optical power of the signal is less than 21.3 dBm. This ensures that the optical power of the signal is less than 21.3 dBm beyond the predetermined distance from the amplifier, guaranteeing that the safety impact of the amplifier being in the "on" state beyond the predetermined distance range is controllable.

[0081] In one possible implementation, combining Figure 3 In the architecture shown, the other end of the optical fiber can also be used to connect to another communication node. For example, see [reference]. Figure 5 As shown, an embodiment of this application provides a schematic diagram of an optical communication network. It should be noted that, for ease of explanation, in the following embodiments of this application, the other communication node connected to the other end of the optical fiber is designated as communication node 20, and this should not be construed as limiting the embodiments of this application.

[0082] Specifically, in combination Figure 5 As shown, the first communication node ( Figure 5 Communication node 10) is used to connect the first end of the optical fiber, and the second communication node ( Figure 5 The communication node 20 is used to connect the second end of the optical fiber.

[0083] Optional, combined Figure 5 As shown, communication node 20 includes a second OTN board ( Figure 5 The OTN board 401 and the second amplifier ( Figure 5 Amplifier 402 in the middle); Amplifier 402 is connected between the second end of the optical fiber and the second OTN board 401.

[0084] Optionally, amplifier 402 can be a preamplifier PA, used to amplify the optical signal (e.g., service optical signal) received by communication node 20 to ensure transmission quality. In one possible implementation, the communication node 20 may also include more communication devices, which is not limited in the embodiments of this application. It is easy to understand that, for ease of explanation, only [specific examples are mentioned here]. Figure 5 The architecture shown is for illustrative purposes only and should not be construed as limiting the embodiments of this application.

[0085] In one possible implementation, communication node 20 receives service optical signals transmitted by communication node 10 via OTN board 401. These service optical signals carry service data. Communication node 20 is also configured to control amplifier 402 to switch to a shutdown state when a fault is detected on the optical fiber based on the received service optical signals. In this way, the other communication node (i.e., communication node 20) connected to the opposite side of communication node 10 can determine whether a fault exists on the optical fiber and can promptly shut down its amplifier when a fault is detected, thereby effectively reducing the energy consumption of the optical communication network.

[0086] Optionally, communication node 10 is also configured to control amplifier 402 in communication node 10 to switch to the off state in response to amplifier 402 in communication node 20 switching to the off state. In this way, the communication node (i.e., communication node 10) can switch off its own amplifier in a timely manner in response to the transmission state of the optical fiber.

[0087] Based on the above, when a fault occurs on the optical fiber, the communication nodes on both sides of the optical communication network can shut down their own amplifiers in a timely manner, thereby effectively reducing the energy consumption of the optical communication network and ensuring the security of the optical communication network.

[0088] Specifically, in combination Figure 5 As shown, during normal transmission in this optical communication network, in the downlink direction, communication node 10 transmits service optical signals along the optical fiber to communication node 20. Specifically, the service optical signal is transmitted from the OTN board 301 in communication node 10 to amplifier 302. After being amplified by amplifier 302, the service optical signal is transmitted along the optical fiber to amplifier 402 in communication node 20. The received service optical signal is amplified by amplifier 402 and then transmitted to the OTN board 401 in communication node 20. It is easy to understand that in the uplink direction, communication node 20 transmits service optical signals along the optical fiber to communication node 10. The transmission process can be referred to the above process and will not be repeated here.

[0089] Optional, combined Figure 5 As shown, communication node 20 also includes a detection device ( Figure 5(Detection device 403 in the communication node 20). In some examples, the detection device 403 in the communication node 20 described above may also be an OTDR.

[0090] Since the safe limit for optical power is 21.3 dBm, and the maximum detection capability (also known as the detection range) of an OTDR is typically 20 dB to 25 dB, the optical power of the signal output from the amplifier to the optical fiber can reach a maximum of 41.3 dBm to 46.3 dBm (i.e., 13 W to 40 W) while ensuring no harm to the human body. This far exceeds the output power of current mainstream amplifiers, meaning that the output power of current mainstream amplifiers is difficult to reach 13 W to 40 W. Therefore, the predetermined distance (i.e., D1 or D2) range can be determined to be 20 dB to 25 dB to ensure that the optical power outside this predetermined distance range will not cause harm to the human body.

[0091] Based on the above, combined with Figure 5 In the architecture shown, the optical power of the optical signal output from the amplifier to the optical fiber will attenuate by 20dB to 25dB after transmission within the D1 range, which is no longer harmful to the human body (e.g., within the D3 range). Therefore, the range within D2 of the amplifier 302 in communication node 10 can be defined as the predetermined distance. For example, combined with... Figure 5 The architecture shown can also define a predetermined distance within the range of distance D2 from amplifier 402 in communication node 20.

[0092] Typically, when a fiber optic cable fails, all amplifiers can be shut down using the IPA function. Then, a detection device in the communication node (e.g., detection device 303) will begin detecting the transmission status of the fiber optic cable, such as determining if a fault exists. If a fault is detected within the detection range of the OTDR, the amplifiers remain off; if no fault is detected and the transmission status remains unchanged after a certain detection period, the amplifiers are turned on. Thus, if the fiber optic cable has been repaired, service transmission resumes. If the fiber optic cable has not yet been repaired, service transmission will automatically resume once the cable is repaired.

[0093] based on Figure 5 The architecture shown is exemplary, referencing Figure 6 As shown, an embodiment of this application provides a schematic diagram of a communication method. The following will be combined with... Figure 6 The communication method provided in the embodiments of this application will be described in detail below. It should be noted that, here, the method is described in detail below. Figure 5 The architecture shown is used as an example to illustrate the communication method provided in the embodiments of this application through communication node 10 and communication node 20, and should not be construed as limiting the communication method provided in the embodiments of this application. The following description, in conjunction with... Figure 5The architecture shown illustrates the communication method provided in the embodiments of this application.

[0094] It should be noted that, in combination Figure 5 As shown, the structure of communication node 20 can also be referred to Figure 3 The structure of the communication node 10 is shown. For ease of explanation, the following steps are based on the example where the communication node 10 sends a service optical signal to the communication node 20 in the downlink direction, and the location of the resulting fault point is within D1; where the predetermined distance is D1.

[0095] It is not difficult to understand that in the following method embodiments of this application, the first communication device is described as communication device 10 and the second communication device as communication device 20, and this should not be construed as limiting the embodiments of this application. Therefore, in the following embodiments, the first communication device and communication device 10 may sometimes be used interchangeably, and the second communication device and communication device 20 may also be used interchangeably. It should be noted that, without emphasizing their differences, their intended meanings are consistent.

[0096] The following is combined with Figure 6 The communication method provided in the embodiments of this application will be described, including steps 601 to 609, as follows:

[0097] Step 601: The first communication node sends a service optical signal to the second communication node.

[0098] Combination Figure 6 As shown, the first communication node sends a service optical signal to the second communication node. Specifically, in conjunction with... Figure 5 As shown, communication node 10 sends a service optical signal to communication node 20, and the service optical signal carries service data.

[0099] Generally, in the open state, amplifier 302 is used to transmit service optical signals with OTN board 301. For example, amplifier 302 amplifies the service optical signal output by OTN board 301 and then sends it to communication node 20 to ensure transmission quality.

[0100] Based on this, the communication method executed by the first communication node (i.e., communication node 10) includes:

[0101] Step 602: Determine if the service optical signal is lost.

[0102] In one possible implementation, combining Figure 5As shown, communication node 20 can determine whether a service optical signal has been lost based on the service optical signal received by OTN board 401 (transmitted by communication node 10). If communication node 20 determines that the service optical signal has been lost, it will turn off its own amplifier 402. Furthermore, communication node 20 can also notify communication node 10 of the detected service optical signal loss by sending a signal (including the service optical signal) to communication node 10. In this way, communication node 10 can determine that the service optical signal has been lost.

[0103] Combination Figure 6 As shown, the first communication node determines that the service optical signal has been lost. Specifically, in conjunction with... Figure 5 As shown, the OTN board 301 in communication node 10 determines that the service optical signal is lost.

[0104] Step 603: Enable IPA status, then switch to off.

[0105] Combination Figure 6 As shown, the amplifier in the first communication node switches from IPA (In-Person Alternate Access) to off. Specifically, in conjunction with... Figure 5 As shown, amplifier 302 in communication node 10 is in IPA state and can be switched to off state through IPA function.

[0106] Step 604: Perform periodic testing.

[0107] Combination Figure 6 As shown, the detection device in the first communication node begins periodic detection. Specifically, in conjunction with... Figure 5 As shown, after amplifier 302 is switched to the off state, detection device 303 in communication node 10 begins to periodically detect the transmission status of optical fibers within a predetermined distance (e.g., D1) from amplifier 302.

[0108] In one possible implementation, the fault point is located within D1. The detection device 303 then performs periodic checks, enabling it to detect fault points within a predetermined distance (e.g., D1) from the amplifier.

[0109] At a certain moment, the fault point within D1 is repaired, and the communication methods executed by the first communication node also include:

[0110] Step 605: There are no fault points within the predetermined distance range.

[0111] Combination Figure 6 As shown, the detection device in the first communication node performs detection and determines that there are no fault points within a predetermined distance range. Specifically, in conjunction with... Figure 5As shown, after the fault point in D1 is repaired, the detection device 303 in the communication node 10 detects the transmission status of the optical fiber within a predetermined distance (e.g., D1) from the amplifier 302, and determines that there are no fault points within the predetermined distance D1.

[0112] Optionally, the detection device 303 performs the detection by: outputting a detection optical signal to the optical fiber and receiving a return optical signal that has been transmitted through the optical fiber and output to the amplifier 302. Based on the detection optical signal and the return optical signal, the detection device 303 determines that there are no fault points on the optical fiber within a predetermined distance range (e.g., D1) from the amplifier 302.

[0113] For example, the detection device 303 performs the following: the amplifier 302 outputs a detection optical signal to the optical fiber; the detection device 303 receives the detection optical signal transmitted through the optical fiber and outputs a return optical signal to the amplifier 302; based on the return optical signal, the detection device 303 determines that there are no fault points on the optical fiber within a predetermined distance (e.g., D1) from the amplifier 302.

[0114] Step 606: Switch to the open state.

[0115] Combination Figure 6 As shown, the amplifier in the first communication node is switched to the on state. Specifically, in conjunction with... Figure 5 As shown, after the detection device 303 determines that there are no fault points within a predetermined distance (e.g., D1), the amplifier 302 in the communication node 10 switches to the on state.

[0116] In one possible implementation, in conjunction with step 605, when the detection device 303 determines that there is no fault point within a predetermined distance D1, it sends a first control signal to the amplifier 302, wherein the first control signal is used to indicate that there is no fault point on the optical fiber within a predetermined distance (e.g., D1) from the amplifier 302; the amplifier 302 switches to the on state based on the received first control signal.

[0117] Step 607: Restore service optical signal transmission.

[0118] Combination Figure 6 As shown, the first communication node determines that the service optical signal transmission has been restored. Specifically, in conjunction with... Figure 5 As shown, the OTN board 301 in communication node 10 determines the restoration of service optical signal transmission. The method by which the OTN board 301 determines the restoration of service optical signal transmission can be referenced from the method by which the OTN board 301 determines the loss of service optical signal in step 602, and will not be repeated here.

[0119] Step 608: Exit IPA state.

[0120] Combination Figure 6 As shown, the amplifier in the first communication node exits the IPA state. Specifically, in conjunction with... Figure 5 As shown, after the OTN board 301 in communication node 10 determines that the transmission of the service optical signal has been restored, the amplifier 302 in communication node 10 exits the IPA state.

[0121] Step 609: Stop the detection.

[0122] Combination Figure 6 As shown, the detection device in the first communication node stops detection. Specifically, in conjunction with... Figure 5 As shown, after the OTN amplifier 302 in communication node 10 exits the IPA state, the detection device 303 in communication node 10 stops detection.

[0123] Optionally, the communication method described in steps 601 to 609 above can also be applied to... Figure 5 Other application scenarios of the optical communication network shown include:

[0124] Scenario 1: Communication node 10 sends a service optical signal to communication node 20 in the downlink direction, and the location of the fault point is within D3; where the predetermined distance in this scenario is D1.

[0125] Scenario 2: Communication node 10 sends a service optical signal to communication node 20 in the downlink direction, and the location of the fault point is within D2; where the predetermined distance in this scenario is D1.

[0126] It is easy to understand that, taking the example of communication node 10 sending service optical signals to communication node 20 in the downlink direction, the transmission process between communication node 10 and communication node 20 in the uplink direction can refer to the above process, and will not be repeated here.

[0127] Based on steps 601 to 609 above, in the communication node provided in the embodiments of this application, the detection device and the amplifier can be combined to determine the optical fiber transmission status at the near end of the communication node (e.g., within a predetermined distance range) through the detection device. Furthermore, after the optical fiber is repaired (there are no fault points within the predetermined distance range), the detection device controls the amplifier to switch to the open state in order to restore the service.

[0128] Based on steps 601 to 609 above, combined with Figure 7 As shown, the processing flow corresponding to the above communication method includes:

[0129] The communication methods performed by communication node 10 include:

[0130] Step 701: Send service optical signal. Specifically, the OTN board 301 in communication node 10 sends a service optical signal to communication node 20.

[0131] A fault occurred in D1 at the first moment.

[0132] The communication method executed by communication node 10 also includes:

[0133] Step 702: Determine if the service optical signal is lost. Specifically, OTN board 301 determines if the service optical signal is lost.

[0134] Step 703: Enable IPA and switch the amplifier to the off state. Specifically, amplifier 302 enables IPA and switches to the off state.

[0135] Step 704: The detection device begins periodic detection. Specifically, detection device 303 begins periodic detection.

[0136] Step 705: Determine if a fault point exists within a predetermined distance range. Specifically, the detection device 303 determines if a fault point exists within a predetermined distance range.

[0137] Step 706: The amplifier remains off. Specifically, amplifier 302 remains off.

[0138] At the second moment, the fault point in D1 is repaired.

[0139] Step 707: Determine that there are no fault points within the predetermined distance range. Specifically, the detection device 303 determines that there are no fault points within the predetermined distance range.

[0140] Step 708: The amplifier is switched to the on state. Specifically, amplifier 302 is switched to the on state.

[0141] Step 709: Confirm the recovery of service optical signal transmission. Specifically, OTN board 301 confirms the recovery of service optical signal transmission.

[0142] Step 710: Amplifier exits IPA state. Specifically, amplifier 302 exits IPA state.

[0143] based on Figure 6 and Figure 7 In one possible implementation of the communication method, when the communication node determines that the service optical signal is lost, the amplifier activates the IPA state but remains in the open state (without switching to the closed state).

[0144] For example, refer to Figure 8As shown in the diagram, an embodiment of this application also provides a schematic diagram of a communication method. The communication method includes steps 601, 602, 604, and steps 605 to 609, which can be referred to... Figure 6 As previously mentioned, this will not be repeated here. Based on Figure 6 As shown below, in conjunction with Figure 8 Another embodiment of the communication method provided in this application will be described in detail below:

[0145] After step 602 and before step 604, the communication method further includes:

[0146] Step 801: Enable IPA status and keep it open.

[0147] Combination Figure 8 As shown, the amplifier in the first communication node is in IPA mode and remains in the on state. Specifically, in conjunction with... Figure 5 As shown, amplifier 302 in communication node 10 is in IPA state and remains in the open state.

[0148] After step 604 and before step 605, the communication method further includes:

[0149] Step 802: There is a fault point within the predetermined distance range.

[0150] Combination Figure 6 As shown, the detection device in the first communication node performs detection and determines that a fault point exists within a predetermined distance range. Specifically, in conjunction with... Figure 5 As shown, the detection device 303 in the communication node 10 detects the transmission status of the optical fiber within a predetermined distance (D1) from the amplifier 302 and determines that there is a fault point within the predetermined distance D1.

[0151] Step 803: Switch to the off state.

[0152] Combination Figure 6 As shown, the amplifier in the first communication node is switched to the off state. Specifically, in conjunction with... Figure 5 As shown, after the detection device 303 in communication node 10 determines that there is a fault point within a predetermined range D1, the amplifier 302 in communication node 10 switches to the off state.

[0153] In one possible implementation, the detection device 303 sends a first control signal to the amplifier 302; the amplifier 302 switches to the on state based on the received first control signal.

[0154] based on Figure 8 The steps shown are exemplary and refer to Figure 9 As shown, the processing flow corresponding to the above communication method includes:

[0155] The communication methods performed by communication node 10 include:

[0156] Step 701: Send service optical signal. Specifically, the OTN board 301 in communication node 10 sends a service optical signal to communication node 20.

[0157] A fault occurred in D1 at the first moment.

[0158] The communication method executed by communication node 10 also includes:

[0159] Step 702: Determine if the service optical signal is lost. Specifically, OTN board 301 determines if the service optical signal is lost.

[0160] Step 901: Enable IPA mode; the amplifier remains on. Specifically, refer to... Figure 5 As shown, after the OTN board 301 determines that the service optical signal is lost, the amplifier 302 is in IPA state and does not switch to the off state, but remains in the on state.

[0161] Step 704: The detection device begins periodic detection. Specifically, detection device 303 begins periodic detection.

[0162] Step 705: Determine if a fault point exists within a predetermined distance range. Specifically, the detection device 303 determines if a fault point exists within a predetermined distance range.

[0163] Step 902: Switch the amplifier to the off state.

[0164] Specifically, in combination Figure 5 As shown, after the detection device 303 determines that there is a fault point within a predetermined distance range, the amplifier 302, which is in the open state, switches to the closed state.

[0165] At the second moment, the fault point in D1 is repaired.

[0166] Step 707: Determine that there are no fault points within the predetermined distance range. Specifically, the detection device 303 determines that there are no fault points within the predetermined distance range.

[0167] Step 708: Amplifier switched to the ON state. Specifically, amplifier 302 is switched to the ON state.

[0168] Step 709: Confirm the recovery of service optical signal transmission. Specifically, OTN board 301 confirms the recovery of service optical signal transmission.

[0169] Step 710: Amplifier exits IPA state. Specifically, amplifier 302 exits IPA state.

[0170] based on Figure 8 and Figure 9 In the event of a service optical signal transmission failure (e.g., loss), after the detection device in the communication node determines the transmission status of the optical fiber (e.g., whether there is a fault point), the amplifier can switch its own state accordingly.

[0171] It should be noted that the above embodiment uses the scenario where communication node 10 sends a service optical signal to communication node 20 in the downlink direction, the fault point is located within D1, and the amplifier remains open (without switching to the closed state) when in IPA mode. This should not be used to limit the above communication method. Of course, the communication method described in the above embodiments of this application can also be applied to similar scenarios.

[0172] In one possible implementation, communication node 10 sends a service optical signal to communication node 20 in the downlink direction, and the location of the fault point is within D3. The predetermined distance is D1 (or D2).

[0173] For example, refer to Figure 10 As shown, communication node 10 and communication node 20 execute Figure 6 The communication method described herein implements the corresponding functions, which will not be elaborated further here.

[0174] based on Figure 6 The communication method shown is exemplary and refers to Figure 11 As shown, embodiments of this application also provide a processing flow for the above-mentioned scenario, including:

[0175] The communication methods performed by communication node 10 include:

[0176] Step 701: Send service optical signal. Specifically, the OTN board 301 in communication node 10 sends a service optical signal to communication node 20.

[0177] A fault occurred in D1 at the first moment.

[0178] The communication method executed by communication node 10 also includes:

[0179] Step 702: Determine if the service optical signal is lost. Specifically, OTN board 301 determines if the service optical signal is lost.

[0180] Step 703: Enable IPA and switch the amplifier to the off state. Specifically, amplifier 302 enables IPA and switches to the off state.

[0181] Step 704: The detection device begins periodic detection. Specifically, detection device 303 begins periodic detection.

[0182] Step 1001: Determine that there are no fault points within the predetermined distance range.

[0183] Specifically, in combination Figure 5 As shown, the detection device performs periodic detection within a predetermined distance (e.g., D1). Since the fault point is located within the D3 range, when the detection device 303 performs periodic detection within the predetermined distance range, it cannot detect the fault point within the D3 range. The detection device 303 determines that there is no fault point within the predetermined distance range.

[0184] Step 1002: The amplifier is switched to the on state. Specifically, amplifier 302 is switched to the on state.

[0185] Specifically, in combination Figure 5 As shown, the detection device 303 performs periodic detection within a predetermined distance (e.g., D1 or D2). After determining that there are no fault points within the predetermined distance range, the amplifier 302 switches to the on state.

[0186] Step 1003: The service optical signal is still lost, and the amplifier remains in IPA state.

[0187] Specifically, in combination Figure 5 As shown, since there is still a fault point in D3, the OTN board 301 determines that the service signal is still lost, and the amplifier 302 maintains the IPA state.

[0188] In the second moment, the fault point in D3 is repaired.

[0189] Step 709: Confirm the recovery of service optical signal transmission. Specifically, OTN board 301 confirms the recovery of service optical signal transmission.

[0190] Step 710: Amplifier exits IPA state. Specifically, amplifier 302 exits IPA state.

[0191] It should be noted that the above embodiment uses a scenario where communication node 10 sends a service optical signal to communication node 20 in the downlink direction, and the fault point is located within D3. This should not be used to limit the above communication method. Of course, the communication method described in the above embodiments of this application can also be applied to similar scenarios.

[0192] Based on the above solution, in the communication node provided in the embodiments of this application, the fiber optic transmission status at the far end of the communication node (outside the predetermined distance range) can be determined by the detection device, thereby determining whether the amplifier needs to be switched to the on state in order to restore the service.

[0193] based on Figure 5 The architecture shown is exemplary, referencing Figure 12As shown in the diagram, embodiments of this application also provide a schematic diagram of a communication method. The following will be combined with... Figure 12 The communication method provided in the embodiments of this application will be described in detail below. It should be noted that, here, the method is described in detail below. Figure 5 The architecture shown is used as an example to illustrate the communication method provided in the embodiments of this application through communication node 10 and communication node 20, and should not be construed as limiting the communication method provided in the embodiments of this application. The following description, in conjunction with... Figure 5 The architecture shown illustrates the communication method provided in the embodiments of this application.

[0194] For ease of explanation, the following steps assume a scenario where communication node 10 sends a service optical signal to communication node 20 in the downlink direction, resulting in a fault point located within D3. Before this fault point is repaired, a new fault point appears in D1; where the predetermined distance is D1. The following steps, combined with... Figure 12 The communication method provided in the embodiments of this application will be described, including steps 1101 to 1113, as follows:

[0195] Step 1101: The first communication node sends a service optical signal to the second communication node.

[0196] Combination Figure 12 As shown, the first communication node sends a service optical signal to the second communication node. Specifically, in conjunction with... Figure 5 As shown, communication node 10 sends a service optical signal to communication node 20, and the service optical signal carries service data.

[0197] Based on this, the communication method executed by the first communication node (i.e., communication node 10) includes:

[0198] Step 1102: Determine if the service optical signal is lost.

[0199] Combination Figure 12 As shown, the OTN board in the first communication node determines that the service optical signal has been lost. Specifically, in conjunction with... Figure 5 As shown, the OTN board 301 in communication node 10 determines that the service optical signal is lost.

[0200] Step 1103: Enable IPA status, then switch to off.

[0201] Combination Figure 12 As shown, the amplifier in the first communication node switches from IPA (In-Person Alternate Access) to off. Specifically, in conjunction with... Figure 5 As shown, amplifier 302 in communication node 10 is in IPA state and then switched to off state.

[0202] Step 1104: Perform periodic testing.

[0203] Combination Figure 12 As shown, the detection device in the first communication node begins periodic detection. Specifically, in conjunction with... Figure 5 As shown, after amplifier 302 is switched to the off state, the detection device 303 in communication node 10 begins to periodically detect the transmission status of the optical fiber within a predetermined distance (D1) from amplifier 302.

[0204] Step 1105: There are no fault points within the predetermined distance range.

[0205] Combination Figure 12 As shown, the detection device in the first communication node performs detection and determines that there are no fault points within a predetermined distance range. Specifically, in conjunction with... Figure 5 As shown, the fault point is located within the range of D3. The detection device 303 in the communication node 10 detects the transmission status of the optical fiber within a predetermined distance (D1) from the amplifier 302 and determines that there is no fault point within the predetermined distance D1.

[0206] Step 1106: Switch to the open state.

[0207] Combination Figure 12 As shown, the amplifier in the first communication node is switched to the on state. Specifically, in conjunction with... Figure 5 As shown, after the detection device 303 in communication node 10 determines that there are no fault points within a predetermined distance (D1), the amplifier 302 in communication node 10 switches to the on state.

[0208] At a certain moment, a fault point occurs within D1. The communication methods executed by the first communication node also include:

[0209] Step 1107: There is a fault point within the predetermined distance range.

[0210] Combination Figure 12 As shown, the detection device in the first communication node performs detection and determines that there are no fault points within a predetermined distance range. Specifically, in conjunction with... Figure 5 As shown, the fault point is located within the range of D1. The detection device 303 in the communication node 10 detects the transmission status of the optical fiber within a predetermined distance (D1) from the amplifier 302 and determines that there is a fault point within the predetermined distance D1.

[0211] Step 1108: Switch to the off state.

[0212] Combination Figure 12 As shown, the amplifier in the first communication node is switched to the off state. Specifically, in conjunction with... Figure 5As shown, after the detection device 303 in the communication node 10 determines that there is a fault point within a predetermined distance (D1), the amplifier 302 in the communication node 10 switches to the off state.

[0213] If the fault point within D1 is repaired at a certain moment, the communication methods executed by the first communication node will also include:

[0214] Step 1109: There are no fault points within the predetermined distance range.

[0215] Combination Figure 12 As shown, the detection device in the first communication node performs detection and determines that there are no fault points within a predetermined distance range. Specifically, in conjunction with... Figure 5 As shown, the fault point within the range of D1 has been repaired, but the fault point is still within the range of D3. The detection device 303 in the communication node 10 detects the transmission status of the optical fiber within a predetermined distance (D1) from the amplifier 302 and determines that there is no fault point within the predetermined distance D1.

[0216] Step 1110: Switch to the open state.

[0217] Combination Figure 12 As shown, the amplifier in the first communication node is switched to the on state. Specifically, in conjunction with... Figure 5 As shown, after the detection device 303 in communication node 10 determines that there are no fault points within a predetermined distance (D1), the amplifier 302 in communication node 10 switches to the on state.

[0218] Step 1111: Service optical signal transmission recovery.

[0219] Combination Figure 12 As shown, the first communication node determines that the service optical signal transmission has been restored. Specifically, in conjunction with... Figure 5 As shown, the OTN board 301 in communication node 10 determines the restoration of service optical signal transmission.

[0220] Step 1112: Exit IPA state.

[0221] Combination Figure 12 As shown, the amplifier in the first communication node exits the IPA state. Specifically, in conjunction with... Figure 5 As shown, after the OTN board 301 in communication node 10 determines that the transmission of the service optical signal has been restored, the amplifier 302 in communication node 10 exits the IPA state.

[0222] Step 1113: Stop the detection.

[0223] Combination Figure 12 As shown, the detection device in the first communication node stops detection. Specifically, in conjunction with... Figure 5As shown, after the OTN amplifier 302 in communication node 10 exits the IPA state, the detection device 303 in communication node 10 stops detection.

[0224] It should be noted that the above embodiment uses the scenario where communication node 10 sends a service optical signal to communication node 20 in the downlink direction, and the resulting fault point is located within D3. Before this fault point is repaired, a fault point reappears in D1. This should not be used to limit the above communication method. Of course, the communication method described in the above embodiments of this application can also be applied to similar scenarios.

[0225] Based on steps 1101 to 1113 above, in the communication node provided in the embodiments of this application, the fiber optic transmission status at the near end (e.g., within a predetermined distance range) and the far end (outside the predetermined distance range) of the communication node can be determined by the detection device, thereby determining whether the amplifier needs to be switched to the on state in order to restore the service.

[0226] based on Figure 12 The communication method shown is exemplary and refers to Figure 13 As shown, embodiments of this application also provide a processing flow for the above-mentioned scenario, including:

[0227] The communication methods performed by communication node 10 include:

[0228] Step 1201: Send service optical signal. Specifically, the OTN board 301 in communication node 10 sends a service optical signal to communication node 20.

[0229] A fault occurred within D3 immediately.

[0230] The communication method executed by communication node 10 also includes:

[0231] Step 1202: Determine if the service optical signal is lost. Specifically, OTN board 301 determines if the service optical signal is lost.

[0232] Step 1203: Enable IPA and switch the amplifier to the off state. Specifically, amplifier 302 enables IPA and switches to the off state.

[0233] Step 1204: The detection device begins periodic detection. Specifically, detection device 303 begins periodic detection.

[0234] Step 1205: Determine that there are no fault points within the predetermined distance range. Specifically, the detection device 303 determines that there are no fault points within the predetermined distance range.

[0235] Step 1206: Amplifier switched to the ON state. Specifically, amplifier 302 is switched to the ON state.

[0236] At the second moment, a fault occurs in D1.

[0237] Step 1207: Determine if a fault point exists within a predetermined distance range. Specifically, the detection device 303 determines if a fault point exists within a predetermined distance range.

[0238] Step 1208: Amplifier switched to the off state. Specifically, amplifier 302 is switched to the off state.

[0239] In the third moment, the fault point in D1 is repaired.

[0240] Step 1209: Determine that there are no fault points within the predetermined distance range. Specifically, the detection device 303 determines that there are no fault points within the predetermined distance range.

[0241] Step 1210: Amplifier switched to the ON state. Specifically, amplifier 302 is switched to the ON state.

[0242] Step 1211: The service optical signal is still lost, and the amplifier maintains the IPA state. Specifically, OTN board 301 determines that the service optical signal is still lost, and amplifier 302 maintains the IPA state.

[0243] In the fourth moment, the fault point in D3 is repaired.

[0244] Step 1212: Determine if the service optical signal transmission has been restored. Specifically, OTN board 301 determines if the service optical signal transmission has been restored.

[0245] Step 1213: Amplifier exits IPA state. Specifically, amplifier 302 exits IPA state.

[0246] Based on the above steps, when the communication node provided in the embodiment of this application can determine the fiber optic transmission status at the near end (e.g., within a predetermined distance range) and the far end (outside the predetermined distance range) of the communication node through the detection device, it can determine whether the amplifier needs to be switched to the on state.

[0247] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software programs, it can be implemented, in whole or in part, in the form of a computer program product. This computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or can include one or more data storage devices such as servers or data centers that can be integrated with media. The available medium can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)). In embodiments of this application, the computer may include the aforementioned devices.

[0248] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings, disclosure, and appended claims, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple instances. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce a good effect.

[0249] 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 spirit and 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 node, characterized in that, include: A first OTN board and a first amplifier connected to the first OTN board, wherein the first amplifier is connected between the first end of an optical fiber and the first OTN board, and the first end of the optical fiber is also connected to a detection device. The first amplifier is configured to receive a first control signal sent by the detection device, the first control signal being used to indicate that there are no fault points on the optical fiber within a predetermined distance from the first amplifier; The first amplifier switches to an on state based on the first control signal, wherein, in the on state, the first amplifier is used to transmit service optical signals with the first OTN board.

2. The communication node according to claim 1, characterized in that, The communication node includes the detection device; The detection device is specifically used to output a detection optical signal to the optical fiber and to receive the return optical signal that is transmitted through the optical fiber and output to the first amplifier. When the detection device determines, based on the detection optical signal and the return optical signal, that there are no fault points on the optical fiber within a predetermined distance from the first amplifier, it sends the first control signal to the first amplifier.

3. The communication node according to claim 1, characterized in that, The detection device is disposed within the first amplifier; The first amplifier is specifically used to output a detection optical signal to the optical fiber; The detection device is used to receive the return optical signal output to the first amplifier after the detection optical signal is transmitted through the optical fiber; Based on the returned optical signal, the detection device determines that there are no fault points on the optical fiber within a predetermined distance from the first amplifier.

4. The communication node according to any one of claims 1-3, characterized in that, The first amplifier is configured to receive a second control signal sent by the detection device, the second control signal being used to indicate that there is a fault point on the optical fiber within a predetermined distance from the first amplifier; The first amplifier switches to the off state based on the second control signal.

5. The communication node according to any one of claims 1-4, characterized in that, The detection device includes an optical time domain reflectometer (OTDR).

6. The communication node according to any one of claims 1-4, characterized in that, The first amplifier includes at least one of the following: a Raman fiber amplifier and an optical power amplifier.

7. An optical communication network, characterized in that, The optical communication network includes: a first communication node and a second communication node; Wherein, the first communication node includes the communication node as described in any one of claims 1-6; The first communication node is used to connect to the first end of the optical fiber, and the second communication node is connected to the second end of the optical fiber.

8. The optical communication network according to claim 7, characterized in that, The second communication node includes: a second OTN board and a second amplifier, wherein the second amplifier is connected between the second end of the optical fiber and the second OTN board; The second communication node is used to receive service optical signals transmitted by the first communication node through the second OTN board, wherein the service optical signals carry service data; The second communication node is further configured to control the second amplifier in the second communication node to switch to a closed state when it determines that the service optical signal received by the second OTN board is lost.

9. The optical communication network according to claim 8, characterized in that, The first communication node is also configured to control the first amplifier in the first communication node to switch to a closed state in response to the loss of the service optical signal.

10. A communication method, characterized in that, The communication method is applied to a communication node, which includes: a first OTN board and a first amplifier connected to the first OTN board. The first amplifier is connected between a first end of an optical fiber and the first OTN board, and the first end of the optical fiber is also connected to a detection device. The communication method includes: The communication node receives a first control signal sent by the detection device through the first amplifier. The first control signal indicates that there are no fault points on the optical fiber within a predetermined distance from the first amplifier. Based on the first control signal, the communication node switches the first amplifier to an on state. In the on state, the first amplifier is used to transmit service optical signals with the first OTN board.

11. The communication method according to claim 10, characterized in that, The communication method further includes: The communication node outputs a detection optical signal to the optical fiber through the detection device, and receives a return optical signal that is transmitted through the optical fiber and output to the first amplifier; when the communication node determines, based on the return optical signal, that there is no fault point on the optical fiber within a predetermined distance from the first amplifier, it sends the first control signal to the first amplifier through the detection device.

12. The communication method according to claim 10, characterized in that, The communication method further includes: The communication node outputs a detection optical signal to the optical fiber through the first amplifier; the communication node receives the return optical signal from the detection optical signal after it has been transmitted through the optical fiber and output to the first amplifier through the detection device; when the communication node determines, based on the return optical signal, that there is no fault point on the optical fiber within a predetermined distance from the first amplifier, it sends the first control signal to the first amplifier through the detection device.

13. The communication method according to any one of claims 10-12, characterized in that, The communication method further includes: The communication node receives a second control signal sent by the detection device through the first amplifier; the communication node switches the first amplifier to the off state based on the second control signal.

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