On-line monitoring optical communication link monitoring and protecting device

Abstract

The utility model provides an optical communication link monitoring and protecting device for online monitoring, which solves the problems that an optical time domain reflectometer (OTDR) module needs to access a communication optical fiber through a fiber wavelength division multiplexing (FWDM), so that the signal optical communication quality is influenced, and the type selection of the OTDR is limited, reduces the use of an optical switch, reduces the system cost, and comprises a transmitting end and a receiving end, a main optical fiber and a standby optical fiber are connected between the transmitting end and the receiving end, the transmitting end adopts a 1: 1 optical splitter or a 1 * 2 optical switch, the receiving end adopts a 2 * 2 optical switch, and one port at the output side of the 2 * 2 optical switch is connected to an optical communication link; the OTDR module is connected with the other port of the output side of the 2 * 2 optical switch; and the port of the output side of the 2 * 2 optical switch connected to the optical communication link is further connected with a PD optical detector, one path of output of the PD optical detector is connected to the optical communication link, and the other path of output of the PD optical detector is connected with the OCM module.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication networks, in particular to an optical communication link monitoring and protection device for online monitoring. Background Art

[0002] As the scale of data center interconnect (DCI) networks gradually expands, monitoring and breaking protection of optical fibers in the interconnected networks has become a key technology for the next generation of DCI networks. At present, the protection of the main and backup optical fiber lines is mainly achieved through the optical fiber line automatic switching protection device (OLP). OLP usually consists of a 1x2 optical switch, a splitter, and a photodetector (PD). Fiber fault monitoring is mainly carried out through a handheld optical time domain reflectometer (OTDR). After the fault occurs, the staff will reconnect the line for detection. In the intelligent optical network, intelligent and integrated requirements are put forward for optical fiber link detection, and the monitoring and protection system needs to be more efficient and intelligent, and less damage to the line.

[0003] Traditional optical fiber line automatic switching protection devices such as Figure 1 As shown in the figure, it is composed of a 1:1 optical splitter, a 1x2 optical switch and a PD (a 95:5 optical splitter takes light from the communication signal for monitoring). This structure is usually called "double-transmit and select-receive" protection. If the transmitter is replaced with a 1x2 optical switch, it is called "selective transmission and selective reception" protection, but due to its complex structure, it is less practical.

[0004] Traditional OLP devices do not include link monitoring functions. When a fiber link fails, construction workers need to go to the site to unplug the fiber and connect a handheld OTDR instrument for detection. For the problem of online monitoring, it is currently achieved through external online OTDR modules and optical channel monitoring (OCM) modules. Among them, OCM only scans the optical power of each wavelength in the signal and does not affect the switching logic of link protection. If multiplexing is required, it is usually achieved by connecting a 1xN optical switch after the corresponding module.

[0005] The existing OLP multi-channel monitoring solution essentially combines multi-channel OTDR modules and multi-channel OCM modules directly with traditional OLP devices, which has the following problems:

[0006] In data center interconnection scenarios, service signals are usually dense wavelength division multiplexing (DWDM) signals. OTDR must be connected to the communication optical fiber through a filter wavelength division multiplexer (FWDM). Due to the access of additional optical devices, the signal light quality is degraded; and due to the limitations of FWDM optical devices, the monitoring wavelength of OTDR must avoid the band where the communication light is located, which limits the selection and monitoring quality.

[0007] In addition, due to the requirements of optical communication, when no fault occurs, the OTDR module actually only needs to detect whether the backup optical fiber is normal. When a fault occurs, it switches to the main line, detects the fault location and issues an alarm. However, in the current connection solution, both the main and backup lines need to be connected to the OTDR module, so a single set of transceiver optical fibers needs to provide a 1x2 optical switch. In multiplexing monitoring, N sets of optical fibers need to be configured with N 1x2 optical switches; and because the OTDR and OCM monitoring modules are relatively independent, optical switches need to be configured separately, which seriously increases the system cost. Utility Model Content

[0008] In view of the above problems, the utility model provides an online monitoring optical communication link monitoring and protection device, which solves the problem that the OTDR module needs to be connected to the communication optical fiber through FWDM, thereby affecting the signal optical communication quality and limiting the OTDR selection, while reducing the use of optical switches and reducing system costs.

[0009] The technical solution is as follows: an online monitoring optical communication link monitoring and protection device comprises a transmitting end and a receiving end, wherein a main optical fiber and a backup optical fiber are connected between the transmitting end and the receiving end.

[0010] The transmitting end adopts a 1:1 optical splitter or a 1x2 optical switch, and the receiving end adopts a 2x2 optical switch, and one port on the output side of the 2x2 optical switch is connected to an optical communication link;

[0011] Also includes:

[0012] An OTDR module, wherein the OTDR module is connected to another port on the output side of the 2x2 optical switch;

[0013] The OCM module, the port on the output side of the 2x2 optical switch connected to the optical communication link is also connected to a PD optical detector, one output of the PD optical detector is connected to the optical communication link, and the other output is connected to the OCM module.

[0014] Furthermore, when the dual receiving and selecting mechanism is adopted, the transmitting end adopts a 1:1 splitter, and a filter is provided at the port connected to the main optical fiber on the output side of the 1:1 splitter, and a filter is provided at the port connected to the OTDR module on the output side of the 2x2 optical switch.

[0015] Furthermore, when the selective transmission and reception mechanism is adopted, the transmitting end adopts a 1x2 optical switch.

[0016] Furthermore, the OTDR module and the OCM module are integrated in an OTDR-OCM integrated module.

[0017] Furthermore, the OTDR-OCM integrated module also includes a 1xN optical switch, wherein N is the number of multiplexed lines, and FWDM devices are respectively arranged on both sides of the 1xN optical switch. On the first side of the 1xN optical switch having one port, the detection light emitted / received by the OTDR module and the signal sampling light received by the OCM module are combined by the FWDM device, and on the second side of the 1xN optical switch having N ports, the detection light emitted / received by the OTDR module and the signal sampling light received by the OCM module are separated by the FWDM device.

[0018] Furthermore, the OTDR-OCM integrated module also includes a 2xN optical switch, wherein N is the number of multiplexed lines, and on a first side of the 2xN optical switch having 2 ports, the 2 ports are respectively connected to the OTDR module and the OCM module, and on a second side of the 2xN optical switch having N ports, the N ports are connected to the FWDM device.

[0019] Furthermore, the OTDR-OCM integrated module also includes a 2x2N optical switch, wherein N is the number of multiplexed lines, and on a first side of the 2x2N optical switch having 2 ports, the 2 ports are respectively connected to the OTDR module and the OCM module, and on a second side of the 2x2N optical switch having 2N ports, the ports numbered 1-N are used for OTDR detection light, and the ports numbered N+1-2N are used for signal sampling light, and the 2N ports are respectively connected to FWDM devices.

[0020] Furthermore, it also includes a network management system for managing and controlling the components in the optical communication link monitoring and protection device, and the network management system is installed in the OTDR-OCM integrated module or in an external main control board.

[0021] The utility model has the following advantages:

[0022] 1. The utility model provides a non-invasive online monitoring optical fiber monitoring protection solution, which replaces the 1x2 optical switch at the receiving end of the traditional OLP device with a 2x2 optical switch. The signal light and the OTDR are connected to different ports on the same side, so that when the main and backup lines are switched, the OTDR module is connected to the non-communication optical fiber to perform fault detection and alarm. The OTDR detection light does not intervene in the optical fiber where the signal light is located, and there is no need to add additional filter components to the communication link; the backup line optical fiber is always detected by the OTDR module, which can avoid the situation where the backup line fails at the same time when the main line fails. The OTDR module does not need to be connected to the communication optical fiber through optical devices such as FWDM, and will not have any impact on the signal light.

[0023] In addition, by adopting the technical solution of the utility model, the detection of two optical fibers in a single optical path including a main and backup path can be completed by a single OTDR module, and there is no need to configure an optical switch; in multiplexing detection, the OTDR only needs to be configured with a 1xN optical switch. The OTDR module and OCM module of the utility model can be integrated into a single board, and the OTDR and OCM modules can share a 1xN optical switch for N-channel multiplexing through the FWDM device. The price of FWDM is much lower than that of the optical switch, and the number of optical switches used is significantly reduced compared with the existing solution, which effectively reduces the system cost.

[0024] By adopting the technical solution of the utility model, soft fault problems in optical communication links can be detected, that is, the situation where communication is not interrupted but the communication quality is reduced, and a more intelligent switching strategy can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a conventional automatic switching protection device for optical fiber lines;

[0026] Figure 2 is a schematic diagram of an OLP device with an OTDR module and an OCM module;

[0027] Figure 3 It is a schematic diagram of the optical communication link monitoring and protection device for online monitoring in Example 1;

[0028] Figure 4 It is a schematic diagram of the optical communication link monitoring and protection device for online monitoring in Example 2;

[0029] Figure 5 This is a module schematic diagram of the OTDR-OCM integrated module in Example 3;

[0030] Figure 6 This is a module schematic diagram of the OTDR-OCM integrated module in Example 4;

[0031] Figure 7 This is a module schematic diagram of the OTDR-OCM integrated module in Example 5;

[0032] Figure 8 Schematic diagram of the optical path connection status when the main path fails;

[0033] Fig. 9 This is a processing flow chart of a multi-channel online monitoring optical communication link monitoring and protection device in Example 6. DETAILED DESCRIPTION

[0034] Embodiment 1:

[0035] Example 1 realizes online monitoring and protection of a single optical fiber. Figure 3In the embodiment, the online monitoring optical communication link monitoring and protection device includes a transmitting end and a receiving end, and a main optical fiber 1 and a backup optical fiber 2 are connected between the transmitting end and the receiving end.

[0036] The transmitting end uses a 1:1 optical splitter 3, and the receiving end uses a 2x2 optical switch 4. One port on the output side of the 2x2 optical switch 4 is connected to the optical communication link, and the two ports on the output side of the 1:1 optical splitter 3 are respectively connected to the main optical fiber 1 and the backup optical fiber 2. The two ports on the input side of the 2x2 optical switch 4 are respectively connected to the main optical fiber 1 and the backup optical fiber 2.

[0037] An OTDR module, the OTDR module is connected to another port on the output side of the 2x2 optical switch 4;

[0038] The OCM module is connected to the output side port of the 2x2 optical switch 4 of the optical communication link, and is also connected to a PD optical detector 5. The PD optical detector 5 uses a 95:5 optical splitter to take light from the communication signal for monitoring. One output of the PD optical detector 5 is connected to the optical communication link, and the other output is connected to the OCM module.

[0039] In the embodiment, the OTDR module and the OCM module are integrated into an OTDR-OCM integrated module 6 .

[0040] In Example 1, a dual-receive and selective transmission mechanism is adopted. Based on the characteristics of the "dual-transmit and selective reception" solution, signal light exists in the transmitting optical fibers of the main / backup paths at the same time, but only one path is received by the receiving end; in the embodiment, a filter is provided at the port connected to the main optical fiber on the output side of the 1:1 splitter 3 to block the OTDR detection light; a filter is provided at the port connected to the OTDR module on the output side of the 2x2 optical switch to block the signal light.

[0041] Take Example 1 as an example to illustrate the working principle: Figure 3 , 8 As shown, the receiving end of the conventional OLP device in Example 1 is changed to a 2x2 optical switch 3, and the c1 and c2 ports are connected to the backup optical fiber and the main optical fiber respectively. In the default state, the c1 port of the 2x2 optical switch 3 is connected to the c4 port, and the c2 port is connected to the c3 port. The c3 port is used for signal communication, and a PD optical detector 5 is added to the communication optical fiber and connected to the OCM, and the c4 port is connected to the OTDR module in the OTDR-OCM integrated module.

[0042] When the main line is communicating normally, the OTDR module detects the backup fiber, and if there is a fault in the backup fiber, an early alarm is issued. When the main fiber fails, the 2x2 optical switch 3 switches the switch state, c1-c3 is connected, and c2-c4 is connected; the backup fiber communication is enabled, and the OTDR module is connected to the main line, detecting the fault location of the main fiber and issuing an alarm.

[0043] By replacing the 1x2 optical switch at the receiving end of the traditional OLP device with a 2x2 optical switch, and connecting the signal light and the OTDR to different ports on the same side, the OTDR module can be connected to the non-communication optical fiber to perform fault detection and alarm when the main and backup lines are switched. The detection of two optical fibers in a single optical path (including the main and backup lines) can be completed by a single OTDR without configuring an optical switch.

[0044] Embodiment 2:

[0045] Example 2 realizes online monitoring and protection of a single optical fiber. Figure 4 In this embodiment, a selective transmission and selective reception mechanism is adopted. In the embodiment, the optical communication link monitoring and protection device for online monitoring includes a transmitting end and a receiving end, and a main optical fiber 1 and a backup optical fiber 2 are connected between the transmitting end and the receiving end.

[0046] The transmitting end uses a 1x2 optical switch 7, and the receiving end uses a 2x2 optical switch 4. One port on the output side of the 2x2 optical switch 4 is connected to the optical communication link, and the two ports on the output side of the 1x2 optical switch 7 are respectively connected to the main optical fiber 1 and the backup optical fiber 2. The two ports on the input side of the 2x2 optical switch 4 are respectively connected to the main optical fiber 1 and the backup optical fiber 2.

[0047] An OTDR module, the OTDR module is connected to another port on the output side of the 2x2 optical switch 4;

[0048] The OCM module, the port on the output side of the 2x2 optical switch 4 connected to the optical communication link is also connected to a PD optical detector 5, one output of the PD optical detector 5 is connected to the optical communication link, and the other output is connected to the OCM module.

[0049] In the embodiment, the OTDR module and the OCM module are integrated into an OTDR-OCM integrated module 6 .

[0050] In Embodiment 2, a selective transmission and selective reception mechanism is adopted, and the transmitting end adopts a 1x2 optical switch 7, and no optical device is required to be configured at the connection between the 2x2 optical switch 4 and the OTDR module. No matter which access method is adopted, no wavelength combining and splitting device needs to be added to the signal optical link, and the working band of the OTDR module is not restricted. The working wavelength of a single-channel OTDR can overlap with the signal optical band. The OTDR detection light does not intervene in the optical fiber where the signal light is located, and there is no need to add additional filter components to the communication link, which will not cause additional damage to the signal light.

[0051] In Examples 1 and 2, the detection of two optical fibers in a single optical path (including the main and backup paths) including the main and backup paths can be completed by a single OTDR without configuring an optical switch. For a single light direction, the OTDR does not require an additional optical switch to achieve the detection of the main / backup paths, which effectively reduces the cost and solves the problem that a practical online OTDR module for a single optical fiber needs to be configured with an additional optical switch.

[0052] Embodiment 3:

[0053] Embodiment 3 realizes online monitoring and protection of multiple optical fibers by multiplexing a single optical switch. In the embodiment, the optical communication link monitoring and protection device for multiple online monitoring includes a transmitting end and a receiving end, and a main optical fiber 1 and a backup optical fiber 2 are connected between the transmitting end and the receiving end.

[0054] The transmitting end uses a 1:1 optical splitter 3, and the receiving end uses a 2x2 optical switch 4. One port on the output side of the 2x2 optical switch 4 is connected to the optical communication link, and the two ports on the output side of the 1:1 optical splitter 3 are respectively connected to the main optical fiber 1 and the backup optical fiber 2. The two ports on the input side of the 2x2 optical switch 4 are respectively connected to the main optical fiber 1 and the backup optical fiber 2.

[0055] An OTDR module, the OTDR module is connected to another port on the output side of the 2x2 optical switch 4;

[0056] The OCM module is connected to the output side port of the 2x2 optical switch 4 of the optical communication link, and is also connected to the PD optical detector 5. One output of the PD optical detector 5 is connected to the optical communication link, and the other output is connected to the OCM module. Figure 3 The optical communication link monitoring and protection device for online monitoring in Example 1.

[0057] See Figure 5 In Example 3, the OTDR module and the OCM module are integrated in an OTDR-OCM integrated module 6. The OTDR-OCM integrated module 6 also includes a 1xN optical switch 8, wherein N is the number of multiplexed lines. FWDM devices 9 are respectively provided on both sides of the 1xN optical switch 8. On the first side of the 1xN optical switch 8 having one port, the detection light emitted / received by the OTDR module and the signal sampling light received by the OCM module are combined through the FWDM device 9. On the second side of the 1xN optical switch 8 having N ports, each port is connected to a FWDM device. The detection light emitted / received by the OTDR module and the signal sampling light received by the OCM module are separated through the FWDM device 9. The FWDM device enables the OTDR and OCM modules to share one 1xN optical switch for N-way multiplexing, thereby effectively reducing the system cost.

[0058] Embodiment 4:

[0059] Embodiment 4 realizes online monitoring and protection of multiple optical fibers by multiplexing a single optical switch. In the embodiment, the optical communication link monitoring and protection device for multiple online monitoring includes a transmitting end and a receiving end, and a main optical fiber 1 and a backup optical fiber 2 are connected between the transmitting end and the receiving end.

[0060] The transmitting end uses a 1:1 optical splitter 3, and the receiving end uses a 2x2 optical switch 4. One port on the output side of the 2x2 optical switch 4 is connected to the optical communication link, and the two ports on the output side of the 1:1 optical splitter 3 are respectively connected to the main optical fiber 1 and the backup optical fiber 2. The two ports on the input side of the 2x2 optical switch 4 are respectively connected to the main optical fiber 1 and the backup optical fiber 2.

[0061] An OTDR module, the OTDR module is connected to another port on the output side of the 2x2 optical switch 4;

[0062] The OCM module is connected to the output side port of the 2x2 optical switch 4 of the optical communication link, and is also connected to the PD optical detector 5. One output of the PD optical detector 5 is connected to the optical communication link, and the other output is connected to the OCM module. Figure 3 The optical communication link monitoring and protection device for online monitoring in Example 1.

[0063] See Figure 6 In Example 4, the OTDR module and the OCM module are integrated in an OTDR-OCM integrated module 6, and the OTDR-OCM integrated module 6 also includes a 2xN optical switch 10, where N is the number of multiplexed lines. On the first side of the 2xN optical switch 10 having 2 ports, the 2 ports are respectively connected to the OTDR module and the OCM module, and on the second side of the 2xN optical switch 10 having N ports, the N ports are connected to the FWDM device 9.

[0064] Embodiment 5:

[0065] Embodiment 5 realizes online monitoring and protection of multiple optical fibers by multiplexing a single optical switch. In the embodiment, the optical communication link monitoring and protection device for multiple online monitoring includes a transmitting end and a receiving end, and a main optical fiber 1 and a backup optical fiber 2 are connected between the transmitting end and the receiving end.

[0066] The transmitting end uses a 1:1 optical splitter 3, and the receiving end uses a 2x2 optical switch 4. One port on the output side of the 2x2 optical switch 4 is connected to the optical communication link, and the two ports on the output side of the 1:1 optical splitter 3 are respectively connected to the main optical fiber 1 and the backup optical fiber 2. The two ports on the input side of the 2x2 optical switch 4 are respectively connected to the main optical fiber 1 and the backup optical fiber 2.

[0067] An OTDR module, the OTDR module is connected to another port on the output side of the 2x2 optical switch 4;

[0068] The OCM module is connected to the output side port of the 2x2 optical switch 4 of the optical communication link, and is also connected to the PD optical detector 5. One output of the PD optical detector 5 is connected to the optical communication link, and the other output is connected to the OCM module. Figure 3 The optical communication link monitoring and protection device for online monitoring in Example 1.

[0069] See Figure 7 In Example 5, the OTDR module and the OCM module are integrated in the OTDR-OCM integrated module 6, and the OTDR-OCM integrated module 6 also includes a 2x2N optical switch 11, where N is the number of multiplexed lines. On the first side of the 2x2N optical switch 11 with 2 ports, the 2 ports are respectively connected to the OTDR module and the OCM module. On the second side of the 2x2N optical switch 11 with 2N ports, the ports numbered 1-N are used for OTDR detection light, and the ports numbered N+1-2N are used for signal sampling light. The 2N ports are respectively connected to FWDM devices. Examples 3, 4, and 5 respectively use 1xN optical switches, 2xN optical switches, and 2x2N optical switches in the OTDR-OCM integrated module, and their performance is successively enhanced, but the cost is also increased.

[0070] Embodiment 6:

[0071] In Example 6, the multi-channel online monitoring optical communication link monitoring and protection device, based on Example 3, 4 or 5, also includes a network management system for managing and controlling the components in the optical communication link monitoring and protection device. The network management system is installed in the OTDR-OCM integrated module or in an external main control board.

[0072] When no fault occurs, the OTDR of the OTDR-OCM integrated module 6 monitors the status of the backup optical fiber to ensure the health of the backup optical fiber. When a fault occurs, the signal light is connected to the backup optical fiber for normal communication. The OTDR detection light is connected to the main optical fiber (faulty) to determine the fault location and issue an alarm. The OCM access point is located after the 2x2 optical switch, and the signal light is sampled and monitored through a 95:5 splitter. Both the OTDR detection light and the signal sampling light are connected to the OTDR-OCM module for monitoring and analysis, and the OTDR-OCM module is configured according to applicable requirements.

[0073] During normal operation, the network management system sends a monitoring command, and the core processor of the OTDR-OCM integrated module controls the optical switch to switch to the specified link. The OTDR module starts to detect the backup fiber. And report the monitoring data. The network management system determines whether the fiber is faulty by comparing the standard fiber parameters. If there is no fault, write the monitoring log. If a fault occurs, report it to the network management system, and notify the operation and maintenance unit of the fault level, cause and location. The OCM module synchronously detects the signal light quality and reports the monitoring information to the system. If a soft fault occurs (partial signal abnormality), the reporting system determines whether to switch the main backup path. If a serious fault occurs (the link is completely disconnected), switch the main backup path immediately, and the OTDR detects the fault of the main path and reports it to the system.

[0074] In the embodiment, a network management system is added, and the primary and backup paths can be switched not only when the communication is interrupted, but also when a soft fault is found.

[0075] The method performed by the device of Example 6 is described below, comprising the following steps:

[0076] Periodic polling detection;

[0077] Select the monitoring channel, switch to the selected monitoring line to issue monitoring instructions, and switch the optical switch to the selected port;

[0078] The OTDR module detects the backup optical fiber, reports the monitoring data, and makes fault judgment based on the detection data. If a fault exists, it records the fault level and fault location, issues an optical fiber fault alarm, and notifies the operation and maintenance unit of the fault location and cause. If no fault exists, the monitoring results are written into the monitoring log.

[0079] The OCM module monitors the signal light to determine whether there is a fault. If there is no fault, the signal light monitoring result is written into the monitoring log. If there is a fault, it is determined whether it is a serious fault. Serious faults include communication interruption and complete link disconnection. If it is a serious fault, the main optical fiber and the backup optical fiber are switched. If it is not a serious fault, the situation of non-serious faults includes maintaining communication without interruption but the communication quality is reduced, that is, some signals are abnormal. The external main control board determines whether to switch. After the switch is determined, the main optical fiber and the backup optical fiber are switched, and the fault level and fault location are recorded, and a fiber fault alarm is issued to notify the operation and maintenance unit of the fault location and fault cause.

[0080] Although the signal quality can be monitored by configuring an OCM card in the prior art, it is an isolated system from the OLP, and whether the OLP actually switches the link is completely detected and controlled by the PD photoelectric detector.

[0081] In the embodiment, the switching of the primary and backup paths is not only determined by whether the communication is interrupted. Through OCM detection, when the optical power of some wavelengths is too low, the system can determine to switch the primary and backup paths. This solves the problem that the OLP system determines the switching of the primary and backup paths only through PD judgment, and can only switch in the event of a "hard fault" (communication interruption), and lacks the ability to switch when there is a "soft fault" in the optical fiber communication service (communication is maintained, but the quality of some signals is abnormally reduced). The device in the embodiment can detect soft fault problems in the optical communication link and can provide a more intelligent switching strategy.

[0082] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0083] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An optical communication link monitoring and protection device for online monitoring, comprising a transmitting end and a receiving end, wherein a main optical fiber and a backup optical fiber are connected between the transmitting end and the receiving end, and characterized in that: The transmitting end adopts a 1:1 optical splitter or a 1x2 optical switch, and the receiving end adopts a 2x2 optical switch, and one port on the output side of the 2x2 optical switch is connected to an optical communication link; Also includes: An OTDR module, the OTDR module being connected to another port on the output side of the 2x2 optical switch; The OCM module, the port on the output side of the 2x2 optical switch connected to the optical communication link is also connected to a PD optical detector, one output of the PD optical detector is connected to the optical communication link, and the other output is connected to the OCM module.

2. The optical communication link monitoring and protection device for online monitoring according to claim 1 is characterized in that: When the dual receiving and selecting mechanism is adopted, the transmitting end adopts a 1:1 splitter, and a filter is provided at the port connected to the main optical fiber on the output side of the 1:1 splitter, and a filter is provided at the port connected to the OTDR module on the output side of the 2x2 optical switch.

3. The optical communication link monitoring and protection device for online monitoring according to claim 1 is characterized in that: When the selective transmission and reception mechanism is adopted, the transmitting end adopts a 1x2 optical switch.

4. The optical communication link monitoring and protection device for online monitoring according to claim 1 is characterized in that: The OTDR module and the OCM module are integrated in an OTDR-OCM integrated module.

5. The optical communication link monitoring and protection device for online monitoring according to claim 4 is characterized in that: The OTDR-OCM integrated module also includes a 1xN optical switch, wherein N is the number of multiplexed lines, and FWDM devices are respectively arranged on both sides of the 1xN optical switch. On the first side of the 1xN optical switch having one port, the detection light emitted / received by the OTDR module and the signal sampling light received by the OCM module are combined by the FWDM device, and on the second side of the 1xN optical switch having N ports, the detection light emitted / received by the OTDR module and the signal sampling light received by the OCM module are separated by the FWDM device.

6. The optical communication link monitoring and protection device for online monitoring according to claim 4 is characterized in that: The OTDR-OCM integrated module also includes a 2xN optical switch, wherein N is the number of multiplexed lines. On a first side of the 2xN optical switch having two ports, the two ports are respectively connected to the OTDR module and the OCM module, and on a second side of the 2xN optical switch having N ports, the N ports are connected to the FWDM device.

7. The optical communication link monitoring and protection device for online monitoring according to claim 4 is characterized in that: The OTDR-OCM integrated module also includes a 2x2N optical switch, wherein N is the number of multiplexed lines. On a first side of the 2x2N optical switch having two ports, the two ports are respectively connected to the OTDR module and the OCM module. On a second side of the 2x2N optical switch having 2N ports, ports numbered 1-N are used for OTDR detection light, ports numbered N+1-2N are used for signal sampling light, and the 2N ports are respectively connected to FWDM devices.

8. The optical communication link monitoring and protection device for online monitoring according to claim 4 is characterized in that: It also includes a network management system for managing and controlling the components in the optical communication link monitoring and protection device. The network management system is installed in the OTDR-OCM integrated module or in an external main control board.

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