A multifunctional optical monitoring channel module

Abstract

The present invention discloses a multifunctional optical monitoring channel module and its operation method, which is composed of a digital optical transceiver module, a pulse optical transceiver module, an OTDR demodulation module, an optical fiber coupler, an optical fiber circulator and a management signal processing module. The present invention overcomes the problems of conventional optical monitoring channel modules having single functions and lacking optical cable maintenance information, as well as the problems of OTDR offline optical cable maintenance requiring manual operation and poor real-time response, and can realize optical cable maintenance detection at any time through a network management network. At the same time, the optical monitoring channel and the OTDR jointly occupy an optical fiber channel through time division multiplexing, saving optical fiber channel resources.

Description

Technical Field

[0001] The invention relates to the technical field of optical communications, and in particular to a multifunctional optical monitoring channel module. Background Art

[0002] The optical supervisory channel (OSC) module is a module with optical transmission and optical reception functions that is mainly used to monitor the transmission status of each channel in the optical fiber communication system and the working status of each transmission node. At the transmitting end of the optical communication, the optical supervisory channel inserts the optical supervisory signal of the wavelength (generally 1510nm) generated by this node and outputs it by combining it with the optical signal of the main channel; at the receiving end of the optical communication, the optical supervisory channel separates the optical supervisory signal from the received optical signal. In addition, frame synchronization bytes, public bytes, and overhead bytes used by network management can all be transmitted through the optical supervisory channel. Since the optical supervisory signal uses a wavelength outside the working band of the EDFA, the optical supervisory signal cannot pass through the EDFA and can only be inserted into the wavelength division multiplexing behind the EDFA and removed by demultiplexing in front of the EDFA. The Optical Time Domain Reflectometer (OTDR) is made by using the backscattering caused by Rayleigh scattering and Fresnel reflection when the laser pulse signal is transmitted in the optical fiber. In optical communications, optical time domain reflectometers are widely used in the maintenance and construction of optical cable lines, and can measure optical fiber length, optical fiber transmission attenuation, connector attenuation, fault location, etc. However, since OTDR is only inserted and used during optical fiber maintenance and failure, it lacks real-time response capabilities in emergencies and cannot be linked with OSC, making the existing OSC unable to have the function of real-time optical fiber fault location. Summary of the invention

[0003] The present invention aims to solve the problem that the existing OSC does not have the capability of real-time optical fiber fault location, and provides a multifunctional optical monitoring channel module.

[0004] To solve the above problems, the present invention is achieved through the following technical solutions:

[0005] A multifunctional optical monitoring channel module is composed of a digital optical transceiver module, a pulse optical transceiver module, an OTDR demodulation module, an optical fiber coupler, an optical fiber circulator and a management signal processing module. The management signal processing module is connected to the digital optical transceiver module and the OTDR demodulation module; the OTDR demodulation module is connected to the pulse optical transceiver module. The receiving end of the digital optical transceiver module is connected to the transmission end of the preceding wavelength division multiplexer on the transmission optical fiber, and the transmitting end of the digital optical transceiver module is connected to a branch end of the optical fiber coupler. The receiving end of the pulse optical transceiver module is connected to the third port of the optical fiber circulator, and the transmitting end of the pulse optical transceiver module is connected to the other branch end of the optical fiber coupler. The combining end of the optical fiber coupler is connected to the first port of the optical fiber circulator, and the second port of the optical fiber circulator is connected to the transmission end of the subsequent wavelength division multiplexer on the transmission optical fiber.

[0006] In the above module, the optical fiber coupler is a 1×2 optical fiber coupler.

[0007] In the above module, the front-stage wavelength division multiplexer and the rear-stage wavelength division multiplexer on the transmission optical fiber are both wavelength division multiplexers with a transmission wavelength of 1510 nm.

[0008] The operating method of the multifunctional optical monitoring channel module comprises the following steps:

[0009] The management signal processing module controls the digital optical transceiver module and the pulse optical transceiver module to work alternately in a predetermined cycle and in different time periods;

[0010] When the pulse optical transceiver module is working, the digital optical transceiver module is not working. At this time:

[0011] The pulse optical transceiver module sends the detection optical pulse to the optical fiber coupler, and the optical fiber coupler sends the detection optical pulse to the subsequent wavelength division multiplexer on the transmission optical fiber via the optical circulator; the optical circulator receives the backward Rayleigh scattered signal returned by the subsequent wavelength division multiplexer on the transmission optical fiber, and sends the backward Rayleigh scattered signal to the OTDR demodulation module after photoelectric conversion via the pulse optical transceiver module, and the OTDR demodulation module demodulates the attenuation condition and / or fault location information in the transmission optical fiber from the backward Rayleigh scattered signal, and sends it to the management signal processing module;

[0012] When the digital optical transceiver module is working, the pulse optical transceiver module is not working. At this time:

[0013] If the optical monitoring channel module is located at the transmitting end or the relay end, the digital optical transceiver module receives the OSC channel optical signal of the preceding wavelength division multiplexer on the transmission optical fiber, and converts the OSC channel optical signal into an OSC channel electrical signal and then sends it to the management signal processing module; the management signal processing module first uses the OSC channel electrical signal to obtain management information related to the local device, performs network management monitoring, and then packages the local monitoring electrical signal with the downloaded non-local OSC channel electrical signal to generate a new OSC channel electrical signal, and then sends the new OSC channel electrical signal to the digital optical transceiver module to convert it into an OSC channel optical signal and then sends it to the optical fiber coupler; the optical fiber coupler sends the OSC channel optical signal to the subsequent wavelength division multiplexer on the transmission optical fiber via the optical circulator;

[0014] If the optical monitoring channel module is located at the receiving end, the digital optical transceiver module receives the OSC channel optical signal of the preceding wavelength division multiplexer on the transmission optical fiber, converts the OSC channel optical signal into an OSC channel electrical signal and sends it to the management signal processing module; the management signal processing module first uses the OSC channel electrical signal to obtain management information related to the local device, performs network management monitoring, and then packages the local monitoring electrical signal with the downloaded non-local OSC channel electrical signal to generate a new OSC channel electrical signal, and sends it to the network management terminal.

[0015] In the above steps, the local monitoring electrical signal includes the working status of the EDFA and / or WSS, and the attenuation and / or fault location information sent by the OTDR demodulation module.

[0016] Compared with the prior art, the present invention overcomes the problems of single function of conventional optical monitoring channel module and lack of optical cable maintenance information, as well as the problem that OTDR offline optical cable maintenance requires manual operation and poor real-time response, and can realize optical cable maintenance detection at any time through the network management network. At the same time, the optical monitoring channel and OTDR jointly occupy one optical fiber channel, saving optical fiber channel resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram is a functional block diagram of a multifunctional optical monitoring channel module.

[0018] Figure 2 This is a functional block diagram of another multifunctional optical monitoring channel module.

[0019] Figure 3 for Figure 2 Schematic diagram of application scenarios of the multifunctional optical monitoring channel module. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in combination with specific examples and with reference to the accompanying drawings. It should be noted that the directional terms mentioned in the examples, such as "upper", "lower", "middle", "left", "right", "front", "back", etc., are only referenced to the directions of the accompanying drawings. Therefore, the directions used are only used for illustration and are not used to limit the scope of protection of the present invention.

[0021] Embodiment 1:

[0022] See also Figure 1 , a multifunctional optical monitoring channel module used in a single-fiber unidirectional transmission optical fiber, which is composed of a digital optical transceiver module, a pulse optical transceiver module, an OTDR demodulation module, an optical fiber coupler, an optical fiber circulator and a management signal processing module. The management signal processing module is connected to the digital optical transceiver module and the OTDR demodulation module. The OTDR demodulation module is connected to the pulse optical transceiver module. The receiving end of the digital optical transceiver module is connected to the transmission end of the preceding wavelength division multiplexer on the transmission optical fiber, and the transmitting end of the digital optical transceiver module is connected to a branch end of the optical fiber coupler. The receiving end of the pulse optical transceiver module is connected to the third port of the optical fiber circulator, and the transmitting end of the pulse optical transceiver module is connected to the other branch end of the optical fiber coupler. The combining end of the optical fiber coupler is connected to the first port of the optical fiber circulator, and the second port of the optical fiber circulator is connected to the transmission end of the subsequent wavelength division multiplexer on the transmission optical fiber. In this embodiment, the optical fiber coupler is a 1×2 optical fiber coupler. The front-stage wavelength division multiplexer and the back-stage wavelength division multiplexer on the transmission optical fiber are both wavelength division multiplexers with a transmission wavelength of 1510nm. The 1510nm OSC signal on the transmission optical fiber bypasses the EDFA (erbium-doped fiber amplifier) ​​or WSS (wavelength selective switch) in the form of optical-electrical-optical transmission through the front-stage wavelength division multiplexer, the back-stage wavelength division multiplexer and the digital optical transceiver module. The port connecting the front-stage wavelength division multiplexer to the digital optical transceiver module is the 1510 port, and the port connecting the back-stage wavelength division multiplexer to the optical fiber circulator is the 1510 port.

[0023] The operation method of the multifunctional optical monitoring channel module is as follows:

[0024] (1) The management signal processing module controls the digital optical transceiver module and the pulse optical transceiver module to work alternately in a predetermined cycle and occupy different time periods. For example, if the cycle of the alternating operation is 1 second, the digital optical transceiver module and the pulse optical transceiver module occupy a time period of 0.5 seconds respectively.

[0025] When the pulse optical transceiver module is working, the digital optical transceiver module is not working. At this time:

[0026] The pulse optical transceiver module sends the detection optical pulse to the optical fiber coupler, and the optical fiber coupler sends the detection optical pulse to the subsequent wavelength division multiplexer on the transmission optical fiber via the optical circulator. The optical circulator receives the backward Rayleigh scattered signal returned by the subsequent wavelength division multiplexer on the transmission optical fiber, and sends the backward Rayleigh scattered signal to the pulse optical transceiver module for photoelectric conversion and then to the OTDR demodulation module. The OTDR demodulation module demodulates the attenuation and / or fault location information in the transmission optical fiber from the backward Rayleigh scattered signal and sends it to the management signal processing module.

[0027] When the digital optical transceiver module is working, the pulse optical transceiver module is not working. At this time:

[0028] If the optical monitoring channel module is located at the transmitting end or the relay end, the digital optical transceiver module receives the OSC channel optical signal of the preceding wavelength division multiplexer on the transmission optical fiber, converts the OSC channel optical signal into an OSC channel electrical signal, and sends it to the management signal processing module. The management signal processing module first downloads the OSC channel electrical signal to obtain the management information related to the local device, performs network management monitoring, and then packages the local monitoring electrical signal (such as the working status of EDFA and / or WSS, and the attenuation and / or fault location information sent by the OTDR demodulation module) with the downloaded non-local OSC channel electrical signal to form a new OSC channel electrical signal and uploads it to the digital optical transceiver module, and then converts it into a new OSC channel optical signal through the digital optical transceiver module and sends it to the optical fiber coupler. The optical fiber coupler sends the digital transmission optical signal to the subsequent wavelength division multiplexer on the transmission optical fiber via the optical circulator.

[0029] If the optical monitoring channel module is located at the receiving end, the digital optical transceiver module receives the OSC channel optical signal of the preceding wavelength division multiplexer on the transmission optical fiber, converts the OSC channel optical signal into an OSC channel electrical signal, and sends it to the management signal processing module. The management signal processing module first downloads the OSC channel electrical signal, and then packages the local monitoring electrical signal (such as the working status of EDFA and / or WSS, and the attenuation and / or fault location information sent by the OTDR demodulation module) with the downloaded non-local OSC channel electrical signal to form a new OSC channel electrical signal, which is sent to the network management terminal.

[0030] (2) The management signal processing module repackages the downloaded OSC channel network management signal with the management signals of the local EDFA and / or WSS functional modules, as well as the attenuation and / or fault location information sent by the OTDR demodulation module into a new OSC channel network management signal, and outputs it to the digital optical transceiver module to convert the new OSC channel network management signal into an OSC optical signal and send it to the optical fiber coupler. The optical fiber coupler sends the OSC optical signal to the subsequent wavelength division multiplexer on the transmission optical fiber via the optical fiber circulator.

[0031] Embodiment 2:

[0032] See also Figure 2 , a multifunctional optical monitoring channel module used in dual-fiber bidirectional transmission optical fiber, consists of 2 digital optical transceiver modules, 2 pulse optical transceiver modules, 2 OTDR demodulation modules, 2 optical fiber couplers, 2 optical fiber circulators and a management signal processing module.

[0033] In the uplink transmission optical fiber of the dual-fiber bidirectional transmission optical fiber: the management signal processing module is connected to the uplink digital optical transceiver module and the uplink OTDR demodulation module. The uplink OTDR demodulation module is connected to the uplink pulse optical transceiver module. The input end of the uplink digital optical transceiver module is connected to the transmission end of the preceding wavelength division multiplexer on the uplink transmission optical fiber, and the output end of the uplink digital optical transceiver module is connected to a branch end of the uplink optical fiber coupler. The receiving end of the uplink pulse optical transceiver module is connected to the third port of the uplink optical fiber circulator, and the transmitting end of the uplink pulse optical transceiver module is connected to the other branch end of the uplink optical fiber coupler. The combining end of the uplink optical fiber coupler is connected to the other first port of the uplink optical fiber circulator, and the second port of the uplink optical fiber circulator is connected to the transmission end of the subsequent wavelength division multiplexer on the uplink transmission optical fiber.

[0034] In the downlink transmission optical fiber of the dual-fiber bidirectional transmission optical fiber: the management signal processing module is connected to the downlink digital optical transceiver module and the downlink OTDR demodulation module. The downlink OTDR demodulation module is connected to the downlink pulse optical transceiver module. The input end of the downlink digital optical transceiver module is connected to the transmission end of the preceding wavelength division multiplexer on the downlink transmission optical fiber, and the output end of the downlink digital optical transceiver module is connected to a branch end of the downlink optical fiber coupler. The receiving end of the downlink pulse optical transceiver module is connected to the third port of the downlink optical fiber circulator, and the transmitting end of the downlink pulse optical transceiver module is connected to another branch end of the downlink optical fiber coupler. The combining end of the downlink optical fiber coupler is connected to the first port of the downlink optical fiber circulator, and the second port of the downlink optical fiber circulator is connected to the transmission end of the subsequent wavelength division multiplexer on the downlink transmission optical fiber.

[0035] In this embodiment, the two fiber couplers are 1×2 fiber couplers. The front-stage wavelength division multiplexer and the back-stage wavelength division multiplexer on the transmission optical fiber are both wavelength division multiplexers with a transmission wavelength of 1510 nm. The 1510 nm OSC signal on the upstream and downstream transmission optical fibers is bypassed to EDFA or WSS in the form of optical-electrical-optical transmission through the front-stage wavelength division multiplexer, the back-stage wavelength division multiplexer and the digital optical transceiver module. The ports connecting the upstream and downstream front-stage wavelength division multiplexers and the digital optical transceiver module are 1510 ports, and the ports connecting the upstream and downstream back-stage wavelength division multiplexers and the optical fiber circulator are 1510 ports.

[0036] Figure 3The schematic diagram is a schematic diagram of an application scenario of a multifunctional optical monitoring channel module on a complete transmission optical fiber, which includes at least two multifunctional optical monitoring channel modules applied to a dual-fiber bidirectional transmission optical fiber, one of which is arranged at the input end and the other is arranged at the receiving end.

[0037] The operation method of the multifunctional optical monitoring channel module is as follows:

[0038] (1) For the uplink transmission fiber of a dual-fiber bidirectional transmission fiber:

[0039] (1.1) The management signal processing module controls the digital optical transceiver module and the pulse optical transceiver module to work alternately in a predetermined cycle and occupy different time periods. For example, if the cycle of the alternating work is 1 second, the digital optical transceiver module and the pulse optical transceiver module occupy a time period of 0.5 seconds respectively.

[0040] When the pulse optical transceiver module is working, the digital optical transceiver module is not working. At this time:

[0041] The pulse optical transceiver module sends the detection optical pulse to the optical fiber coupler, and the optical fiber coupler sends the detection optical pulse to the subsequent wavelength division multiplexer on the transmission optical fiber via the optical circulator. The optical circulator receives the backward Rayleigh scattered signal returned by the subsequent wavelength division multiplexer on the transmission optical fiber, and sends the backward Rayleigh scattered signal to the pulse optical transceiver module for photoelectric conversion and then transmits it to the OTDR demodulation module. The OTDR demodulation module demodulates the attenuation and / or fault location information in the transmission optical fiber from the backward Rayleigh scattered signal and sends it to the management signal processing module.

[0042] When the digital optical transceiver module is working, the pulse optical transceiver module is not working. At this time:

[0043] The digital optical transceiver module receives the OSC channel optical signal of the preceding wavelength division multiplexer on the transmission optical fiber, converts the OSC channel optical signal into an OSC channel electrical signal, and sends it to the management signal processing module. The management signal processing module first uses the OSC channel electrical signal to obtain the management information related to the local device, performs network management monitoring, and then packages the local monitoring electrical signal with the non-local OSC channel electrical signal to generate a new OSC channel electrical signal and sends it to the digital optical transceiver module. The digital optical transceiver module converts the new OSC channel electrical signal into a new OSC channel optical signal and sends it to the optical fiber coupler. The optical fiber coupler sends the new OSC channel optical signal to the subsequent wavelength division multiplexer on the transmission optical fiber via an optical circulator.

[0044] (1.2) The management signal processing module repackages the obtained channel transmission conditions and / or transmission node working conditions and the attenuation conditions and / or fault location information sent by the OTDR demodulation module into a measurement electrical signal. The receiving digital optical transceiver module converts the measurement electrical signal into a measurement optical signal and sends it to the optical fiber coupler. The optical fiber coupler sends the measurement optical signal to the subsequent wavelength division multiplexer on the transmission optical fiber via the optical fiber circulator.

[0045] (2) In the downlink transmission optical fiber of a dual-fiber bidirectional transmission optical fiber:

[0046] The management signal processing module controls the digital optical transceiver module and the pulse optical transceiver module to work alternately in a predetermined cycle and occupy different time periods. For example, if the cycle of the alternate work is 1 second, the digital optical transceiver module and the pulse optical transceiver module occupy a time period of 0.5 seconds respectively.

[0047] When the pulse optical transceiver module is working, the digital optical transceiver module is not working. At this time:

[0048] The pulse optical transceiver module sends the detection optical pulse to the optical fiber coupler, and the optical fiber coupler sends the detection optical pulse to the subsequent wavelength division multiplexer on the transmission optical fiber via the optical circulator. The optical circulator receives the backward Rayleigh scattered signal returned by the subsequent wavelength division multiplexer on the transmission optical fiber, and transmits the backward Rayleigh scattered signal to the OTDR demodulation module after photoelectric conversion via the pulse optical transceiver module. The OTDR demodulation module demodulates the attenuation and / or fault location information in the transmission optical fiber from the backward Rayleigh scattered signal and sends it to the management signal processing module.

[0049] When the digital optical transceiver module is working, the pulse optical transceiver module is not working. At this time:

[0050] The digital optical transceiver module receives the OSC channel optical signal of the preceding wavelength division multiplexer on the transmission optical fiber, converts the OSC channel optical signal into an OSC channel electrical signal, and sends it to the management signal processing module. The management signal processing module first uses the OSC channel electrical signal to obtain the management information related to the local device, performs network management monitoring, and then packages the local monitoring electrical signal with the non-local OSC channel electrical signal to generate a new OSC channel electrical signal and sends it to the digital optical transceiver module. The digital optical transceiver module converts the new OSC channel electrical signal into a new OSC channel optical signal and sends it to the optical fiber coupler. The optical fiber coupler sends the new OSC channel optical signal to the subsequent wavelength division multiplexer on the transmission optical fiber via an optical circulator.

[0051] It should be noted that although the embodiments of the present invention described above are illustrative, they are not intended to limit the present invention, and therefore the present invention is not limited to the above specific embodiments. Without departing from the principles of the present invention, any other embodiments obtained by those skilled in the art under the guidance of the present invention are deemed to be within the protection of the present invention.

Claims

1. A multifunctional optical monitoring channel module, characterized in that: It consists of a digital optical transceiver module, a pulse optical transceiver module, an OTDR demodulation module, an optical fiber coupler, an optical fiber circulator and a management signal processing module; the management signal processing module is connected to the digital optical transceiver module and the OTDR demodulation module; the OTDR demodulation module is connected to the pulse optical transceiver module; the receiving end of the digital optical transceiver module is connected to the transmission end of the front-stage wavelength division multiplexer on the transmission optical fiber, and the transmitting end of the digital optical transceiver module is connected to a branch end of the optical fiber coupler; the receiving end of the pulse optical transceiver module is connected to the third port of the optical fiber circulator, and the transmitting end of the pulse optical transceiver module is connected to the other branch end of the optical fiber coupler; the combining end of the optical fiber coupler is connected to the first port of the optical fiber circulator, and the second port of the optical fiber circulator is connected to the transmission end of the rear-stage wavelength division multiplexer on the transmission optical fiber; The management signal processing module controls the digital optical transceiver module and the pulse optical transceiver module to work alternately in a predetermined cycle and in different time periods; When the pulse optical transceiver module is working, the digital optical transceiver module is not working. At this time: The pulse optical transceiver module sends the detection optical pulse to the optical fiber coupler, and the optical fiber coupler sends the detection optical pulse to the subsequent wavelength division multiplexer on the transmission optical fiber via the optical circulator; the optical circulator receives the backward Rayleigh scattered signal returned by the subsequent wavelength division multiplexer on the transmission optical fiber, and sends the backward Rayleigh scattered signal to the OTDR demodulation module after photoelectric conversion via the pulse optical transceiver module, and the OTDR demodulation module demodulates the attenuation condition and / or fault location information in the transmission optical fiber from the backward Rayleigh scattered signal, and sends it to the management signal processing module; When the digital optical transceiver module is working, the pulse optical transceiver module is not working. At this time: If the optical monitoring channel module is located at the transmitting end or the relay end, the digital optical transceiver module receives the OSC channel optical signal of the preceding wavelength division multiplexer on the transmission optical fiber, converts the OSC channel optical signal into an OSC channel electrical signal, and then sends it to the management signal processing module; The management signal processing module first uses the OSC channel electrical signal to obtain the management information related to the local device, performs network management monitoring, and then packages the local monitoring electrical signal with the downloaded non-local OSC channel electrical signal to generate a new OSC channel electrical signal, and then sends the new OSC channel electrical signal to the digital optical transceiver module to convert it into an OSC channel optical signal and then sends it to the optical fiber coupler; the optical fiber coupler sends the OSC channel optical signal to the subsequent wavelength division multiplexer on the transmission optical fiber via the optical circulator; If the optical monitoring channel module is located at the receiving end, the digital optical transceiver module receives the OSC channel optical signal of the preceding wavelength division multiplexer on the transmission optical fiber, converts the OSC channel optical signal into an OSC channel electrical signal and sends it to the management signal processing module; The management signal processing module first uses the OSC channel electrical signal to obtain management information related to the local device, performs network management monitoring, and then packages the local monitoring electrical signal with the downloaded non-local OSC channel electrical signal to generate a new OSC channel electrical signal, and sends it to the network management terminal.

2. The multifunctional optical monitoring channel module according to claim 1, characterized in that: The optical fiber coupler is a 1×2 optical fiber coupler.

3. The multifunctional optical monitoring channel module according to claim 1, characterized in that: The front-stage wavelength division multiplexer and the rear-stage wavelength division multiplexer on the transmission optical fiber are both wavelength division multiplexers with a transmission wavelength of 1510 nm.

4. The multifunctional optical monitoring channel module according to claim 1, characterized in that: The local monitoring electrical signal includes the working status of the EDFA and / or WSS, and the attenuation condition and / or fault location information sent by the OTDR demodulation module.

Images