Optical transmission node and optical transmission system
By integrating a monitoring unit to detect backscattered signals within the optical transmission node, the system addresses the challenge of fault detection in high-power pump laser environments, ensuring timely and reliable fiber link integrity assessment.
Patent Information
- Application Number
- CN202311286669.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-27
- Publication Date
- 2025-03-28
AI Technical Summary
Current optical communication systems lack a reliable and efficient method to detect faults in fiber links, particularly in systems with high-power pump lasers, which can interfere with maintenance and cause ineffective fault detection.
Incorporating a monitoring unit within the optical transmission node that emits signal light and detects backscattered signals to determine fiber link integrity, enabling timely and multi-scenario fault detection.
This solution allows for effective, timely, and multi-scenario fault detection in optical fiber links, preventing interference with maintenance and enhancing system reliability.
Smart Images
Figure CN119727893A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of optical communications, and in particular to an optical transmission node and an optical transmission system. Background Art
[0002] Fiber-optic communication is one of the main pillars of communication technology. Fiber-optic communication uses light waves as signal carriers and optical fibers as transmission media to build highways for information transmission between cities and countries. Since signal light is lost when it is transmitted in optical fibers, optical amplifiers need to be deployed every certain transmission distance to amplify the signal light, thereby increasing the transmission distance of the signal light.
[0003] In an optical communication system including an optical amplifier unit, it is usually necessary to introduce additional pump light on the basis of the signal light to amplify the signal light. When a fiber link fails, the pump light in the optical amplifier unit needs to be turned off in time, otherwise the high-power pump light will affect the work of the link failure maintenance personnel. However, up to now, there is no suitable monitoring unit deployed in the optical transmission node and optical transmission system to effectively, timely and multi-scenario determine whether the fiber link has failed. Summary of the invention
[0004] The present application provides an optical transmission node and an optical transmission system. By deploying a monitoring unit in the optical transmission node, transmitting signal light, and detecting backward signal light formed after reflection and backscattering of the signal light, it is possible to effectively, timely, and multi-scenario determine whether a fiber optic link has a fault in the optical transmission node where an optical amplification unit is deployed.
[0005] In a first aspect, an optical transmission node is provided, comprising: an optical transceiver unit, for sending a first signal light, the first signal light comprising N second signal lights, the N second signal lights corresponding to N wavelengths one-to-one, and N being a positive integer; an optical amplification unit, for amplifying the first signal light; a monitoring unit, comprising a detection unit and a processing unit, the detection unit being used to send a third signal light; a wavelength combining and demultiplexing unit, for performing wavelength division multiplexing on the amplified first signal light and the third signal light to obtain a fourth signal light; a first optical fiber, for outputting the fourth signal light; the first optical fiber is also used to receive a fifth signal light; the wavelength combining and demultiplexing unit is also used to perform wavelength division multiplexing on the fifth signal light to obtain a sixth signal light and a seventh signal light included in the fifth signal light, wherein the seventh signal light is the third signal light after passing through Scattering and reflection occur after the first optical fiber; the optical amplifying unit is also used to amplify the sixth signal light; the optical transceiver unit is also used to receive the amplified sixth signal light, and obtain M eighth signal lights included in the sixth signal light, the M eighth signal lights correspond to M wavelengths one by one, and M is a positive integer; the processing unit is used to determine whether the first optical fiber fails according to the intensity of the seventh signal light; wherein the optical transceiver unit is optically connected to the first end of the optical amplifying unit, the second end of the optical amplifying unit is optically connected to the first port of the wavelength combining and demultiplexing unit, the monitoring unit is optically connected to the second port of the wavelength combining and demultiplexing unit, and the third port of the wavelength combining and demultiplexing unit is optically connected to the first optical fiber; wherein the wavelengths of the N second signal lights are different from those of the third signal light, and the wavelengths of the M eighth signal lights are different from those of the third signal light.
[0006] In the optical transmission node, an additional monitoring unit is set up to emit signal light and detect the backward signal light formed after the signal light is reflected and backscattered, so as to judge whether the optical fiber fails in the wavelength division multiplexing system based on the backward signal light, thereby effectively and timely judging whether the optical fiber link fails.
[0007] In combination with the first aspect, in some implementations of the first aspect, judging whether the first optical fiber fails according to the intensity of the seventh signal light includes: detecting the intensity of the seventh signal light, and determining that the first optical fiber fails when it is detected that the intensity change of the seventh signal light exceeds a first threshold. That is, if the intensity change of the seventh signal light has an obvious drop point, it is judged that a fiber breakage fault occurs in the first optical fiber.
[0008] In combination with the first aspect, in certain implementations of the first aspect, judging whether the first optical fiber fails according to the intensity of the seventh signal light includes: detecting the intensity of the seventh signal light over multiple cycles, and determining that the first optical fiber fails when it is detected that the difference between the intensity of the seventh signal light corresponding to the first time point and the intensity of the seventh signal light corresponding to the second time point exceeds the second threshold, wherein the first time point and the second time point are corresponding time points of adjacent cycles. That is, when compared with the previous cycle, the difference between the intensity change of the seventh signal light corresponding to the first time point and the intensity change of the seventh signal light corresponding to the second time point exceeds the second threshold, or can also be understood as being obviously unrelated, then it is judged that the first optical fiber fails.
[0009] In combination with the first aspect, in some implementations of the first aspect, the third signal light is a pulse signal light.
[0010] In combination with the first aspect, in some implementations of the first aspect, the optical amplification unit and the monitoring unit are arranged on the same single board. That is, the optical amplification unit and the monitoring unit are integrated. In some implementations, the optical amplification unit and the monitoring unit are arranged on different single boards, thereby realizing flexible deployment of nodes. In some implementations, multiple optical amplification units and monitoring units can be arranged on the same single board, thereby further integrating the units included in the optical transmission node. In some implementations, the optical transmission node can include multiple single boards.
[0011] In combination with the first aspect, in certain implementations of the first aspect, the optical transmission node further includes one or more optical amplifying units and one or more monitoring units, wherein all the optical amplifying units included in the optical transmission node are cascade-connected via a second optical fiber, one or more monitoring units are set corresponding to the one or more optical amplifying units, and the monitoring unit in the one or more monitoring units is used to determine whether the first optical fiber and / or the second optical fiber is faulty. That is, the optical transmission node is provided with multiple optical amplifying units connected in cascade, and monitoring units corresponding to the optical amplifying units are configured, so that when the optical power sent by the pump device set in the optical amplifying unit is too high and it is impossible to determine whether the optical fiber link between the nodes and / or the cascade optical fiber in the node is faulty through the optical power detection point, the corresponding monitoring unit is used to determine whether the cascade-connected optical fiber is faulty.
[0012] In combination with the first aspect, in some implementations of the first aspect, the optical amplification unit includes an erbium-doped fiber optical amplifier or a Raman fiber optical amplifier, so as to amplify the signal light.
[0013] In combination with the first aspect, in some implementations of the first aspect, the optical transmission node further includes a bypass unit, the bypass unit includes a pump transmission unit, one or more pump amplification units, one or more pump monitoring units, a third optical fiber and a fourth optical fiber, wherein: the pump transmission unit is used to transmit pump light; one or more pump amplification units are cascaded through the third optical fiber, and the pump amplification unit is used to amplify the pump light; the fourth optical fiber is used to output the amplified pump light; one or more pump monitoring units are set corresponding to one or more pump amplification units, and the monitoring unit in one or more pump monitoring units is used to determine whether the third optical fiber fails. That is, the bypass unit is provided with multiple pump amplification units connected in cascade, and a pump monitoring unit corresponding to the pump amplification unit is configured. In the current optical transmission node, there is no solution for determining the bypass unit optical fiber failure. Through the correspondingly set pump monitoring unit, it can be effectively determined whether the optical fiber link connected to the bypass unit and / or the cascaded optical fiber in the bypass unit fails.
[0014] In a second aspect, an optical transmission system is provided, comprising at least two optical transmission nodes in the first aspect and any possible implementation thereof, wherein an optical link is provided between any two transmission nodes of the at least two optical transmission nodes, and the optical link is used to transmit signal light.
[0015] In combination with the second aspect, in some implementations of the second aspect, a remote gain unit is provided in the optical link, and the remote gain unit includes a passive optical fiber amplifier. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is an optical transmission node provided in an embodiment of the present application.
[0017] Figure 2 It is a schematic diagram of an optical transceiver unit provided in the embodiment of the present application.
[0018] Figure 3 It is a schematic diagram of an optical amplification unit provided in an embodiment of the present application.
[0019] Figure 4 It is a schematic diagram of a monitoring unit provided in an embodiment of the present application.
[0020] Figure 5 It is a schematic diagram of an intensity loss curve of a seventh signal light detected by a detection unit provided in an embodiment of the present application.
[0021] Figure 6 It is a schematic diagram of an intensity loss curve of a seventh signal light detected by a detection unit provided in an embodiment of the present application.
[0022] Figure 7 It is a schematic diagram of another optical transmission node provided in an embodiment of the present application.
[0023] Figure 8 It is a schematic diagram of another optical transmission node provided in an embodiment of the present application.
[0024] Fig. 9 An optical transmission system is provided in an embodiment of the present application.
[0025] Fig.10 This is another optical transmission system provided in an embodiment of the present application.
[0026] Fig.11 It is a schematic diagram of a method for combining a network management system and a monitoring unit provided in an embodiment of the present application. DETAILED DESCRIPTION
[0027] The technical solution in this application will be described below in conjunction with the accompanying drawings.
[0028] Fiber-optic communication is one of the main pillars of communication technology. Fiber-optic communication uses light waves as signal carriers and optical fibers as transmission media to build highways for information transmission between cities and countries. Since signal light is lost when it is transmitted in optical fibers, optical amplifiers need to be deployed every certain transmission distance to amplify the signal light, thereby increasing the transmission distance of the signal light.
[0029] In an optical communication system including an optical amplifier unit, it is usually necessary to introduce additional pump light on the basis of the signal light to amplify the signal light. When a fiber link fails, the pump light in the optical amplifier unit needs to be turned off in time, otherwise the high-power pump light will affect the work of the link failure maintenance personnel.
[0030] In current optical communication nodes and systems, an optical power detection point is usually introduced at the receiving end. By setting an optical power detection threshold, after detecting that the signal light is less than the set optical power detection threshold, it is determined that the optical fiber link has failed. However, when an optical amplification unit is deployed, especially when the optical amplification unit includes a Raman fiber amplifier, the optical power of the pump light used to amplify the signal light is extremely high, which will cause the receiving end to still receive extremely high backward amplification of spontaneous emission (ASE) light generated by the amplification unit when the optical fiber fails, especially when the fault is far away from the receiving end, making the optical power detection point invalid. Therefore, up to now, there is no monitoring unit deployed in optical transmission nodes and optical transmission systems that can effectively and timely determine whether the optical fiber link has failed.
[0031] In view of this, the present application provides an optical transmission node and an optical transmission system, which deploys a monitoring unit in the optical transmission node, emits signal light, and detects backward signal light formed after reflection and backscattering of the signal light, so as to effectively, timely, and multi-scenario determine whether a fiber optic link has a fault in the optical transmission node where an optical amplification unit is deployed.
[0032] Figure 1 An optical transmission node provided in an embodiment of the present application includes an optical transceiver unit 110, an optical amplification unit 120, a monitoring unit 130, a wavelength combining and decomposing unit 140 and a first optical fiber.
[0033] Among them, the optical transmission node can be used as a transmitting end. The optical transceiver unit 110 is used to send a first signal light, and the first signal light includes N second signal lights, and the N second signal lights correspond to N wavelengths one by one, and N is a positive integer. The optical amplification unit 120 is used to amplify the first signal light. The monitoring unit 130 includes a detection unit and a processing unit, and the detection unit is used to send a third signal light. The wavelength combination and demultiplexing unit 140 is used to perform wavelength division multiplexing on the amplified first signal light and the third signal light to obtain a fourth signal light. The first optical fiber is used to output the fourth signal light.
[0034] In addition, the optical transmission node can also serve as a receiving end. The first optical fiber is also used to receive the fifth signal light. The wavelength combining and demultiplexing unit 140 is also used to demultiplex the fifth signal light to obtain the sixth signal light and the seventh signal light included in the fifth signal light. Among them, the sixth signal light is the signal light sent by another optical transmission node as the transmitting end, and the sixth signal light includes M eighth signal lights, and the M eighth signal lights correspond to the M wavelengths one by one. The optical amplification unit 120 is also used to amplify the sixth signal light. The optical transceiver unit 110 is also used to receive the amplified sixth signal light. Among them, the seventh signal light is formed by scattering and reflection of the third signal light after passing through the first optical fiber. The seventh signal light can also be called a backward signal light. The processing unit in the monitoring unit 130 is used to determine whether the first optical fiber has a fault according to the intensity of the seventh signal light.
[0035] like Figure 1 As shown, the optical transceiver unit 110 is optically connected to the first end of the optical amplifying unit 120, the second end of the optical amplifying unit 120 is optically connected to the first port of the wavelength combining / splitting unit 140, the monitoring unit 130 is optically connected to the second port of the wavelength combining / splitting unit 140, and the third port of the wavelength combining / splitting unit 140 is optically connected to the first optical fiber.
[0036] In such Figure 1In the optical transmission node shown, in order to ensure that the processing unit in the monitoring unit 130 can correctly receive the seventh signal light, the optical transceiver unit 110 and the detection unit in the monitoring unit 130 should be set accordingly so that the wavelengths of the N second signal lights are different from those of the third signal light, and the wavelengths of the M eighth signal lights are different from those of the third signal light.
[0037] In such Figure 1 In the optical transmission node shown, a monitoring unit is additionally provided to emit signal light, and detect backward signal light formed after reflection and backscattering of the signal light, so as to judge whether the optical fiber fails in the wavelength division multiplexing system based on the backward signal light, thereby effectively and timely judging whether the optical fiber link fails.
[0038] The specific structures of the optical transceiver unit 110 , the optical amplification unit 120 , the monitoring unit 130 , and the wavelength combining and decomposing unit 140 are described below with reference to the text and the accompanying drawings.
[0039] Figure 2 1 is a schematic diagram of an optical transceiver unit 110 provided in an embodiment of the present application. When acting as a transmitting end, the optical transceiver unit 110 is used to transmit signal light, and the signal light may include signal light of N wavelengths. When acting as a receiving end, the optical transceiver unit 120 is used to receive signal light, and the signal light may include signal light of M wavelengths. Wherein, N and M are positive integers.
[0040] like Figure 2 As shown, the optical transceiver unit 110 may include N optical transmitters 111, M optical receivers 112 and an optical transceiver combining and demultiplexing unit 113. The N optical transmitters 111 and the M optical receivers 112 are optically connected to the corresponding ports included in the optical transceiver combining and demultiplexing unit 113 according to the corresponding wavelengths. The optical transceiver combining and demultiplexing unit 113 is used to perform wavelength division multiplexing or demultiplexing on the signal light sent and / or received by the optical transceiver unit 110. The optical transceiver combining and demultiplexing unit may specifically include components such as a wavelength selective switch (WSS), an arrayed waveguide grating (AWG), or a coupler / beam splitter, so as to schedule the signal light of multiple wavelengths to be sent and received.
[0041] It should be understood that the present application does not limit the wavelength of the signal light specifically sent by the optical transmitter 111 in the optical transceiver unit 110 and the wavelength of the signal light specifically received by the optical receiver 112. For example, the wavelength of the signal light sent by the optical transmitter 111 and the wavelength of the signal light received by the optical receiver 112 are in the range of 1524nm-1625nm.
[0042] Figure 31 is a schematic diagram of an optical amplifier unit 120 provided in an embodiment of the present application. The optical amplifier unit is used to amplify the signal light sent and / or received by the optical transceiver unit. The optical amplifier unit 120 can be specifically an erbium-doped fiber amplifier or a Raman fiber amplifier. Figure 3 As shown, the optical amplification unit 120 may include a pump device 121 and an optical fiber 122. Wherein, when the optical amplification unit 120 includes an erbium-doped fiber amplifier (EDFA), the optical fiber 122 may refer to an optical fiber doped with erbium ions. The erbium-doped fiber amplifier excites the erbium ions to generate stimulated radiation through the pump light provided by the pump device, and amplifies the signal light. When the optical amplification unit 120 includes a Raman fiber amplifier, the wavelength of the pump light emitted by the pump device 121 may be set according to the wavelength of the transmitted signal light. For example, when the wavelength of the signal light amplified by the optical amplification unit 120 is 1500-1600nm, the wavelength of the pump light transmitted by the pump device 121 may be set to 1400-1500nm, which is 100nm away from the wavelength of the signal light. In some implementations, in an optical fiber transmission link provided with an optical amplification unit, optical elements such as combiners, splitters, and isolators may also be provided at both ends of the optical fiber 122 to guide the pump light out of the optical fiber transmission link after the pump light interacts with the signal light in the optical fiber 122.
[0043] Figure 4 1 is a schematic diagram of a monitoring unit 130 provided in an embodiment of the present application. The monitoring unit 130 includes a detection unit 131 and a processing unit 132. The detection unit 131 may be provided with an optical transmitter for transmitting a third signal light for detecting the first optical fiber. The processing unit 132 may be provided with an optical receiver to detect a seventh signal light formed by scattering and reflecting the third signal light after passing through the first optical fiber, and determine whether the first optical fiber is faulty according to the intensity of the seventh signal light.
[0044] In order to avoid the wavelength duplication between the third signal light emitted by the detection unit 131 and the signal light sent and / or received by the optical transceiver unit, the wavelength of the signal light sent by the detection unit 131 can be set accordingly. For example, the wavelength can be 1300-1320nm or 1490-1520nm, so as to distinguish it from other signal lights.
[0045] In some implementations, the third signal light may be a pulse signal light. The pulse width of the signal light is determined according to the length range of the actual measured optical fiber. For example, when the pulse width is 5-20000ns, the third signal light may be used to detect the first optical fiber in the length range of 5-200km.
[0046] In some implementations, the detection unit determines that the first optical fiber fails when detecting that the intensity change of the seventh signal light exceeds a first threshold. Figure 5 FIG. 1 is a schematic diagram of an intensity loss curve of a seventh signal light detected by a detection unit provided in an embodiment of the present application. Figure 5 As shown in FIG. 1 , if the intensity change of the seventh signal light shows an obvious drop point, it is determined that the first optical fiber has a fiber breakage fault. Figure 5 The fiber break fault method shown is not limited to the case of detecting only the first optical fiber, and according to the specific location of the corresponding monitoring unit, the method can also be specifically applied to detecting optical fibers in other nodes or connected to the nodes. This application does not make any limitation to this.
[0047] In some implementations, the detection unit detects the intensity of the seventh signal light over a plurality of cycles, and determines that the first optical fiber fails when it is detected that the difference between the intensity of the seventh signal light corresponding to a first time point and the intensity of the seventh signal light corresponding to a second time point exceeds a second threshold, wherein the first time point and the second time point are corresponding time points in adjacent cycles. Figure 6 Schematic diagram of a detection unit detecting an intensity loss curve of the seventh signal light provided in an embodiment of the present application. In the case where the monitoring unit pre-sets a cycle time and measures the intensity loss curve of the seventh signal light in units of cycles, as shown in FIG. Figure 6 As shown in (a) and (b), compared with the previous cycle, the difference between the intensity change of the seventh signal light corresponding to the first time point and the intensity change of the seventh signal light corresponding to the second time point exceeds the second threshold, or can also be understood as being obviously unrelated, then it is determined that the first optical fiber has a fault. Figure 6 The fiber break fault method shown is not limited to the case of detecting only the first optical fiber, and according to the specific location of the corresponding monitoring unit, the method can also be specifically applied to detecting optical fibers in other nodes or connected to the nodes. This application does not make any limitation to this.
[0048] In such Figure 1 In the system shown, the wavelength combining and decomposing unit 140 may include components such as WSS, AWG, or coupler / splitter to couple and decouple the signal light. The optical component ports included in the wavelength combining and decomposing unit are specifically configured to correspond to the wavelength of the signal light, so that the signal light is input or output from the corresponding port.
[0049] It should be understood that the optical connection referred to in the present application specifically refers to the transmission of signal light between different optical elements. The specific connection method can be direct connection or indirect connection through other optical elements, and the present application does not limit this.
[0050] In some implementations, a plurality of optical amplification units may also be provided in the optical transmission node. Figure 1The optical transmission node shown may be provided with an optical amplification unit therein, and the optical transmission node may be a general optical transmission system, a Raman system, a remote pump system, a bypass remote pump system or other optical amplification system, and the present application does not limit this. Figure 7 and Figure 8 An optical transmission node provided with a plurality of optical amplification units will be described.
[0051] Figure 7 Schematic diagram of another optical transmission node provided in an embodiment of the present application. The transmission node includes an optical transceiver unit 710, a first optical amplifying unit 721, a first monitoring unit 731, a first wavelength combining and demultiplexing unit 741, a second optical amplifying unit 722, a second monitoring unit 732, and a second wavelength combining and demultiplexing unit 742. The transmission node transmits signal light with other optical transmission nodes through a first optical fiber. Figure 1 The specific configuration of the optical transceiver unit 110 is similar. The first optical amplifying unit 721 and the second optical amplifying unit 722 are Figure 1 The specific configuration of the optical amplification unit 120 is similar. The first monitoring unit 731 and the second monitoring unit 732 are Figure 1 The specific configuration of the monitoring unit 130 is similar, so it will not be described in detail here.
[0052] In the transmission node, the first optical amplifying unit 721 is connected to the second optical amplifying unit 722 in cascade connection through the second optical fiber. The first monitoring unit 731 is arranged corresponding to the first optical amplifying unit 721, and is connected to the optical transmission link of the signal light through the first wavelength combining and demultiplexing unit 741. The second monitoring unit 732 is arranged corresponding to the second optical amplifying unit 722, and is connected to the optical transmission link of the signal light through the second wavelength combining and demultiplexing unit 742. The first monitoring unit 731 and the second monitoring unit 732 are used to determine whether the first optical fiber and / or the second optical fiber fails. That is, the optical transmission node is provided with a plurality of optical amplifying units connected in cascade connection, and a monitoring unit corresponding to the optical amplifying unit is configured, so that when the optical power sent by the pump device arranged in the optical amplifying unit is too high, and it is impossible to determine whether the optical fiber link between the nodes and / or the cascade optical fiber in the node fails through the optical power detection point, the corresponding monitoring unit is used to determine whether the cascade-connected optical fiber fails.
[0053] In some implementations, the optical transmission node may further include one or more optical amplifying units and one or more monitoring units, wherein all the optical amplifying units included in the optical transmission node are also cascade-connected via the second optical fiber, and one or more monitoring units are provided corresponding to the one or more optical amplifying units, and the monitoring unit in the one or more monitoring units is used to determine whether the second optical fiber fails. That is, the optical transmission node is provided with multiple optical amplifying units connected in cascade, and monitoring units corresponding to the optical amplifying units are configured, so that when the optical power sent by the pump device provided in the optical amplifying unit is too high and it is impossible to determine whether the cascaded optical fiber fails through the optical power detection point, the corresponding monitoring unit is used to determine whether the cascaded optical fiber fails.
[0054] In some implementations, such as Figure 7 The first optical amplification unit 721 shown in the figure specifically includes an erbium-doped fiber optical amplifier, and the second optical amplification unit 722 specifically includes a Raman fiber amplifier. Figure 7 The optical transmission node shown can be applicable to both on-channel Raman systems and on-channel remote pumping systems.
[0055] Figure 8 Schematic diagram of another optical transmission node provided in an embodiment of the present application. The transmission node includes an optical transceiver unit 810, a first optical amplifying unit 821, a first monitoring unit 831, a first wavelength combining and demultiplexing unit 841, a second optical amplifying unit 822, a second monitoring unit 832, and a second wavelength combining and demultiplexing unit 842. Figure 7 The optical transceiver unit 710, the first optical amplifying unit 721, the first monitoring unit 731, the first wavelength combining and demultiplexing unit 741, the second optical amplifying unit 722, the second monitoring unit 732 and the second wavelength combining and demultiplexing unit 742 are similar and are not described in detail here.
[0056] In addition, the transmission node also includes a bypass unit, which includes a pump transceiver unit 850, a first pump amplifier unit 861, a first pump monitoring unit 871, a second pump amplifier unit 862, a second pump monitoring unit 872 and a second pump multiplexer unit 882. Among them, the pump transmission unit 850 includes a pump device for sending pump light. The first pump amplifier unit 861 and the second pump amplifier unit 862 are cascaded through a third optical fiber. The first pump amplifier unit 861 and the second pump amplifier unit 862 are used to amplify the pump light. The bypass unit can be connected to a gain unit arranged outside the node through a fourth optical fiber, so as to send the amplified pump light to the gain unit and provide a pump source for the gain unit. The gain unit includes a passive optical fiber amplifier, and the pump light sent by the bypass unit is used to provide a pump source for the passive optical fiber amplifier, thereby amplifying the signal light sent and / or received by the optical transmission node.
[0057] In order to determine whether the third optical fiber and / or the fourth optical fiber fails, a first pump monitoring unit 871 and a first pump wavelength combining and demultiplexing unit 881 may be provided for the first pump amplification unit 861 , and a second pump monitoring unit 872 and a second pump wavelength combining and demultiplexing unit 882 may be provided for the second pump amplification unit 862 .
[0058] In addition, the bypass unit may also include one or more pump amplifier units and one or more pump monitoring units. One or more pump monitoring units are set corresponding to one or more pump amplifier units, and the monitoring unit in one or more pump monitoring units is used to determine whether the third optical fiber and / or the fourth optical fiber fails. That is, the bypass unit is provided with multiple pump amplifier units connected in cascade, and a pump monitoring unit corresponding to the pump amplifier unit is configured. In the current optical transmission node, there is no solution for determining the optical fiber failure of the bypass unit. Through the correspondingly set pump monitoring unit, it can be effectively determined whether the optical fiber link connected to the bypass unit and / or the cascaded optical fiber in the bypass unit fails.
[0059] In some implementations, the first pump amplifier unit 861 includes a first-order Raman fiber amplifier, and the second pump amplifier unit 862 includes a second-order Raman fiber amplifier or a third-order Raman fiber amplifier. The wavelength of the pump light sent by the pump device may be 1400-1500nm. In order to achieve the Raman amplification effect, the wavelength of the pump light sent by the pump devices in the first pump amplifier unit 861 and the second pump amplifier unit 862 may be set to 1300-1400nm. In some implementations, the wavelength of the pump light sent by the pump devices in the first pump amplifier unit 861 and the second pump amplifier unit 862 may also be set to 1200-1300nm, thereby achieving the Raman amplification effect while reducing the noise impact caused by ASE. Figure 8 The optical transmission node shown may be suitable for use in a bypass remote pumping system.
[0060] In such Figure 1 , Figure 7 and Figure 8 In the optical transmission node shown, the optical amplification unit and the monitoring unit can be arranged on the same single board, that is, the optical amplification unit and the monitoring unit are integrated. In some implementations, the optical amplification unit and the monitoring unit are arranged on different single boards, so as to realize flexible deployment of the node. In some implementations, multiple optical amplification units and monitoring units can be arranged on the same single board, so as to further integrate the units included in the optical transmission node. In some implementations, the optical transmission node can include multiple single boards.
[0061] Fig. 9910 is an optical transmission system provided by an embodiment of the present application. The optical transmission system includes at least a first optical transmission node 910 and a second optical transmission node 920. The first optical transmission node 910 and the second optical transmission node 920 can be specifically as follows Figure 1 , Figure 7 and Figure 8 Any optical transmission node shown. An optical link is set between the first optical transmission node 910 and the second optical transmission node 920, and the optical link is used to transmit signal light between the two optical transmission nodes.
[0062] Fig.10 is another optical transmission system provided in the embodiment of the present application. Fig. 9 On the basis of the optical transmission system shown, at least one gain unit, such as gain unit 930, can be set in the optical link to amplify the signal light transmitted in the optical link. In some implementations, the gain unit 930 can be preferentially set at the optical transmission node on the receiving end side, so as to amplify the signal light after the signal light is lost, which helps to improve the processing effect after the receiving end receives the signal light. In the case where the set gain unit includes a passive optical amplifier, that is, only an optical fiber amplifier, an optical transmission node (such as a bypass remote pump system) can be used to send pump light to amplify the signal light.
[0063] In some implementations, such as Fig. 9 and Fig.10 The optical transmission system shown is provided with a network management system, which is used to transmit signals with the monitoring unit included in the optical transmission node. When the monitoring unit in the optical transmission node determines that the corresponding optical fiber has failed, the pump device in the corresponding optical amplification unit is promptly shut down, and the corresponding position of the specific failed optical fiber is displayed, and the maintenance personnel are notified to carry out maintenance.
[0064] Fig.11 Schematic diagram of a method for combining a network management system and a monitoring unit provided in an embodiment of the present application. Fig.11 As shown, the method may include steps S1110-S1150.
[0065] S1110, start the network management system.
[0066] S1120: within 1-10 seconds of starting the network management system, start the optical amplifier unit and the corresponding monitoring unit.
[0067] S1130: The monitoring unit sends the third signal light and detects the seventh signal light, detects a loss curve of the seventh signal light in the first cycle, and uses the loss curve as a reference curve.
[0068] S1140: The monitoring unit continues to detect the seventh signal light in a second cycle adjacent to the first cycle, and determines whether a transmission optical fiber fails based on whether a loss curve of the seventh signal light is correlated with a reference curve.
[0069] S1150: When the loss curve of the seventh signal light is correlated with the reference curve, the loss curve of the seventh signal light detected in the second cycle is used as a new reference curve. When the loss curve of the seventh signal light is not correlated with the reference curve, the optical amplification units upstream and downstream of the faulty optical fiber are turned off, a network warning is issued, and a maintenance personnel is notified to perform maintenance.
[0070] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.
[0071] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.
[0072] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
[0073] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0074] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
[0075] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.
[0076] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. An optical transmission node, characterized in that: include: An optical transceiver unit, configured to send a first signal light, wherein the first signal light includes N second signal lights, wherein the N second signal lights correspond one-to-one to N wavelengths, and N is a positive integer; an optical amplification unit, configured to amplify the first signal light; A monitoring unit, comprising a detection unit and a processing unit, wherein the detection unit is used to send a third signal light; a wavelength combining and demultiplexing unit, configured to perform wavelength division multiplexing on the amplified first signal light and the third signal light to obtain a fourth signal light; A first optical fiber, used for outputting the fourth signal light; The first optical fiber is also used to receive a fifth signal light; The wavelength combination / demultiplexing unit is further used to perform wavelength division multiplexing on the fifth signal light to obtain a sixth signal light and a seventh signal light included in the fifth signal light, wherein the seventh signal light is formed by scattering and reflection of the third signal light after passing through the first optical fiber; The optical amplification unit is also used to amplify the sixth signal light; The optical transceiver unit is further used to receive the amplified sixth signal light and obtain M eighth signal lights included in the sixth signal light, wherein the M eighth signal lights correspond to M wavelengths one by one, and M is a positive integer; The processing unit is used to determine whether the first optical fiber fails according to the intensity of the seventh signal light; The optical transceiver unit is optically connected to the first end of the optical amplifying unit, the second end of the optical amplifying unit is optically connected to the first port of the wavelength combining / decombining unit, the monitoring unit is optically connected to the second port of the wavelength combining / decombining unit, and the third port of the wavelength combining / decombining unit is optically connected to the first optical fiber; The N second signal lights have a different wavelength from the third signal light, and the M eighth signal lights have a different wavelength from the third signal light.
2. The optical transmission node according to claim 1, characterized in that: Determining whether the first optical fiber fails according to the intensity of the seventh signal light includes: The intensity of the seventh signal light is detected, and when it is detected that the intensity change of the seventh signal light exceeds a first threshold, it is determined that the first optical fiber fails.
3. The optical transmission node according to claim 1, characterized in that: Determining whether the first optical fiber fails according to the intensity of the seventh signal light includes: The intensity of the seventh signal light is detected over multiple cycles, and when it is detected that the difference between the intensity of the seventh signal light corresponding to a first time point and the intensity of the seventh signal light corresponding to a second time point exceeds a second threshold, it is determined that the first optical fiber has a fault, wherein the first time point and the second time point are corresponding time points in adjacent cycles.
4. The optical transmission node according to any one of claims 1 to 3, characterized in that: The third signal light is a pulse signal light.
5. The optical transmission node according to any one of claims 1 to 4, characterized in that: The optical amplifying unit and the monitoring unit are arranged on the same board or on different boards.
6. The optical transmission node according to any one of claims 1 to 5, characterized in that: The optical transmission node also includes one or more optical amplifying units and one or more monitoring units, wherein all the optical amplifying units included in the optical transmission node are cascaded via a second optical fiber, the one or more monitoring units are arranged corresponding to the one or more optical amplifying units, and the monitoring unit in the one or more monitoring units is used to determine whether a fault occurs in the first optical fiber and / or the second optical fiber.
7. The optical transmission node according to any one of claims 1 to 6, characterized in that: The optical amplification unit includes an erbium-doped fiber optical amplifier or a Raman fiber optical amplifier.
8. The optical transmission node according to any one of claims 1 to 7, characterized in that: The optical transmission node further includes a bypass unit, which includes a pump transmission unit, one or more pump amplification units, one or more pump monitoring units, a third optical fiber and a fourth optical fiber, wherein: The pump sending unit is used to send pump light; The one or more pump amplification units are cascade-connected via the third optical fiber, and the pump amplification unit is used to amplify the pump light; The fourth optical fiber is used to output the amplified pump light; the one or more pump monitoring units are arranged corresponding to the one or more pump amplification units, and the monitoring unit in the one or more pump monitoring units is used to determine whether the third optical fiber and / or the fourth optical fiber fails.
9. An optical transmission system, characterized in that: The method comprises at least two optical transmission nodes according to any one of claims 1 to 8, wherein an optical link is provided between any two transmission nodes of the at least two optical transmission nodes, and the optical link is used to transmit signal light.
10. The optical transmission system according to claim 9, characterized in that: A remote gain unit is arranged in the optical link, and the remote gain unit comprises a passive optical fiber amplifier.