WO2017197956A1 - 一种集成光时域反射仪的光线路保护系统 - Google Patents

一种集成光时域反射仪的光线路保护系统 Download PDF

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Publication number
WO2017197956A1
WO2017197956A1 PCT/CN2017/075527 CN2017075527W WO2017197956A1 WO 2017197956 A1 WO2017197956 A1 WO 2017197956A1 CN 2017075527 W CN2017075527 W CN 2017075527W WO 2017197956 A1 WO2017197956 A1 WO 2017197956A1
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optical
line protection
filter
time domain
optical filter
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English (en)
French (fr)
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梅亮
曹尔慧
蒋小庆
刘中华
雍博
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Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0771—Fault location on the transmission path

Definitions

  • the present invention relates to the field of optical line protection in a communication network, and in particular to an optical line protection system for an integrated optical time domain reflectometer.
  • each fiber carries a large amount of information transmission, such as an 80 ⁇ 100G system. Once the fiber fails, it will Serious consequences or losses are caused. Therefore, in order to effectively protect the normal transmission of information in the optical fiber, optical line protection is widely used in the field of optical transmission.
  • Optical line protection is generally divided into 1+1 and 1:1 protection forms. .
  • the optical line protection unit When the optical line protection unit detects a fiber failure, it switches the light on the primary or backup line fiber to ensure the normal transmission of information. At the same time, the alarm prompts the maintenance personnel to repair the fiber.
  • the fiber repair needs maintenance.
  • the personnel first carried the OTDR (Optical Time Domain Reflectometer) to the equipment room, tested the fiber, found the breakpoint, and went to the fault point for repair.
  • OTDR Optical Time Domain Reflectometer
  • an object of the present invention is to provide an optical line protection system for an integrated optical time domain reflectometer, which can acquire optical fiber fault conditions and shorten fault processing time in a first time.
  • the technical solution adopted by the present invention is: including: transmitting end and connecting Receiving, the transmitting end and the receiving end are connected by an optical fiber, and the transmitting end and the receiving end are respectively provided with an optical line protection unit for optical line switching, and the optical line protection unit is integrated with an optical time domain reflectometer, The optical time domain reflectometer is used to find fiber fault points.
  • both the transmitting end and the receiving end further comprise an optical monitoring channel unit and two optical power amplifiers, and the optical power amplifier and the optical monitoring channel unit are all connected to the optical line protection unit at the same end thereof.
  • the optical line protection unit in the transmitting end and the optical line protection unit in the receiving end are connected by two optical fibers, each of which includes a primary line fiber and a backup line fiber.
  • the optical line protection units of the transmitting end and the receiving end each include:
  • Three optical filters including a first optical filter, a second optical filter, and a third optical filter;
  • An optical time domain reflectometer connected to a 1 ⁇ 2 optical switch, the 1 ⁇ 2 optical switch being connected to the second optical filter and the third optical filter, and the third optical filter further connected to a light Power detection unit;
  • a 2 x 2 optical switch is coupled to the second optical filter and the third optical filter.
  • the first optical filter is connected to an optical power amplifier and an optical monitoring channel unit at the same end
  • the second optical filter is connected to another optical power amplifier and an optical monitoring channel unit at the same end.
  • the 1:2 coupler and the 2 ⁇ 2 optical switch of the optical line protection unit of the transmitting end respectively pass through the 2 ⁇ 2 optical switch and the 1:2 coupler of the optical line protection unit of the receiving end. All the way to the fiber.
  • optical line protection list of the transmitting end and the receiving end includes:
  • Three optical filters including a first optical filter, a second optical filter, and a third optical filter;
  • Two 2 ⁇ 2 optical switches one of which is connected to the first optical filter and the 1:2 coupler, and the other to the second optical filter and the third optical filter;
  • An optical time domain reflectometer connected to a 1 ⁇ 2 optical switch, the 1 ⁇ 2 optical switch being connected to the second optical filter and the third optical filter, and the third optical filter further connected to a light Power detection unit.
  • the first optical filter is connected to an optical power amplifier at the same end
  • the 1:2 coupler is connected to the optical monitoring channel unit at the same end
  • the second optical filter is connected to another optical terminal at the same end.
  • Optical power amplifier and optical monitoring channel unit are connected to an optical power amplifier at the same end
  • the optical line protection unit of the transmitting end is connected with the 2 ⁇ 2 optical switch of the first optical filter and the optical line protection unit of the receiving end with the 2 ⁇ 2 light of the second optical filter.
  • the switch is connected by one fiber, another 2 ⁇ 2 optical switch of the optical line protection unit of the transmitting end and another 2 ⁇ 2 optical switch of the receiving end of the optical line protection unit are connected by another optical fiber.
  • the invention has the advantages that the optical time domain reflectometer is integrated into the optical line protection unit, and when the optical fiber fails, the optical fiber can be immediately scanned to obtain the optical fiber fault point, thereby greatly reducing the optical fiber fault.
  • the processing time is different, and the wavelength of the scanning light of the optical time domain reflectometer is different from the wavelength of the service light, so that the optical fiber that has failed can be scanned, and the optical fiber carrying the service can be scanned online.
  • FIG. 1 is a schematic structural view of an optical line protection system of an integrated optical time domain reflectometer according to the present invention
  • FIG. 2 is a schematic structural diagram of a 1+1 protection system
  • Figure 3 is a schematic diagram of the structure of a 1:1 protection system.
  • the present invention provides an optical line protection system for an integrated optical time domain reflectometer, comprising a transmitting end and a receiving end, wherein the transmitting end and the receiving end are connected by optical fiber for data transmission, and the transmitting end and the receiving end.
  • An optical line protection unit for optical line switching is provided, and when the working line optical fiber transmitting the service light fails, the optical line protection unit can automatically switch the service light from the primary line optical fiber to the standby line optical fiber (or from the standby line optical fiber).
  • the optical line protection unit is integrated with an optical time domain reflectometer for finding the fiber fault point, light
  • the time domain reflectometer finds the fiber failure point by emitting scanning light into the fiber, and the scanning light is transmitted together with other light in the fiber, such as service light.
  • Both the transmitting end and the receiving end further comprise an optical monitoring channel unit and two optical power amplifiers, an optical power amplifier and an optical monitoring channel unit connected to the optical line protection unit at the same end thereof, and the optical line protection unit and the receiving end in the transmitting end
  • the optical line protection units are connected by two optical fibers, each of which includes a primary line fiber and a backup line fiber.
  • optical line protection system of the integrated optical time domain reflectometer in the invention is suitable for the 1+1 protection system and the 1:1 protection system of the optical line.
  • the optical line protection units of the transmitting end and the receiving end respectively include: three optical filters, a 1:2 coupler, an optical time domain reflectometer, and a 2 ⁇ 2 light.
  • a switch three optical filters are a first optical filter, a second optical filter, and a third optical filter; a 1:2 coupler is connected to the first optical filter; and an optical time domain reflectometer is connected to the 1 ⁇ 2 optical switch a 1 ⁇ 2 optical switch is connected to the second optical filter and the third optical filter, and the third optical filter is further connected to an optical power detecting unit; the 2 ⁇ 2 optical switch and the second optical filter The device is connected to the third optical filter.
  • the first optical filter is connected to an optical power amplifier and an optical monitoring channel unit at the same end
  • the second optical filter is connected to another optical power amplifier and an optical monitoring channel unit at the same end.
  • the 1:2 coupler and the 2 ⁇ 2 optical switch of the optical line protection unit at the transmitting end are respectively connected to the 2 ⁇ 2 optical switch and the 1:2 coupler of the optical line protection unit of the receiving end through one optical fiber.
  • the service light transmitted by the optical fiber at the transmitting end is amplified by the optical power amplifier and the light emitted by the optical monitoring channel unit is combined in the first optical filter, and the combined light is converted into two paths through the 1:2 coupler, and respectively output.
  • the main line fiber and the backup line fiber of the optical fiber are then sent to the 2 ⁇ 2 optical switch of the opposite end receiving end; the light of the main line fiber and the standby line fiber of the opposite end station from the receiving end to the transmitting end are 2 After the ⁇ 2 optical switch, one channel of light is separated by the second optical filter and output to the optical power amplifier and the optical monitoring channel unit, and the other light passes through the third optical filter, and then enters the optical power detecting unit, and the optical time domain reflectometer After the scanning light is switched through the 1 ⁇ 2 optical switch, the second optical filter and the third optical filter are reversely injected into the main line fiber or the backup line fiber connected to the 2 ⁇ 2 optical switch.
  • the direction of the light at the receiving end is the same as that at the transmitting end.
  • the optical line protection units of the transmitting end and the receiving end respectively include: three optical filters, a 1:2 coupler, two 2 ⁇ 2 optical switches, and optical time domain reflection.
  • the three optical filters are a first optical filter, a second optical filter and a third optical filter respectively; a 1:2 coupler is connected to the first optical filter; and one of the two 2 ⁇ 2 optical switches 2
  • the ⁇ 2 optical switch is connected to the first optical filter and the 1:2 coupler, the other is connected to the second optical filter and the third optical filter;
  • the optical time domain reflectometer is connected to a 1 ⁇ 2 optical switch, 1 ⁇ 2
  • the optical switch is connected to the second optical filter and the third optical filter, and the third optical filter is further connected to an optical power detecting unit.
  • the first optical filter is connected to an optical power amplifier at the same end
  • the 1:2 coupler is connected to the optical monitoring channel unit at the same end
  • the second optical filter is connected to another optical power amplifier and optical monitoring channel unit at the same end.
  • Optical line protection unit at the transmitting end The 2 ⁇ 2 optical switch connected to the first optical filter is connected to the optical line protection unit of the receiving end, and the 2 ⁇ 2 optical switch connected to the second optical filter is connected through one optical fiber, and the other 2 ⁇ optical optical protection unit at the transmitting end 2 Optical switch and optical line protection unit at the receiving end Another 2 ⁇ 2 optical switch is connected through another optical fiber.
  • the traffic light from the optical power amplifier is combined in the first optical filter and then enters a 2 ⁇ 2 optical switch, and the other All the way directly into the 2 ⁇ 2 optical switch, the two lights in the 2 ⁇ 2 optical switch are respectively output to the main line fiber and the backup line fiber of one fiber, and the 2 ⁇ 2 optical switch adjusts which way to enter The main line fiber, which enters the standby line fiber, and then sent to the receiving end, the receiving end of the opposite station passes the light from the main line fiber and the spare line fiber through another 2 ⁇ 2 optical switch, and the light passes through the first
  • the two optical filters are separated, they are respectively output to the optical power amplifier and the optical monitoring channel unit, and the other light passes through the third optical filter, and then enters the optical power detecting unit, and the optical time domain reflectometer passes the scanning light through the 1 ⁇ 2 optical switch.
  • the second optical filter and the third optical filter are reversely injected into one main line fiber or the backup line
  • the wavelengths of the scanning light emitted by the service light and the optical monitoring channel unit in the 1+1 protection system and the 1:1 protection system are different, so that the optical fiber can be transmitted without affecting the normal information transmission. Scan.
  • the optical time domain reflectometer By integrating the optical time domain reflectometer in the optical line protection unit, when the optical fiber line fails, the optical time domain reflectometer immediately emits scanning light to scan the optical fiber to obtain fault point information.
  • the optical time domain reflectometer can also periodically scan the optical fiber to scan the optical fiber, and process the abnormal point in advance to reduce the probability of occurrence of the accident.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

本发明公开了一种集成光时域反射仪的光线路保护系统，涉及光线路保护领域，包括：发送端和接收端，所述发送端和接收端之间通过光纤连接，所述发送端和接收端均设置有用于光线路切换的光线路保护单元，所述光线路保护单元集成有光时域反射仪，所述光时域反射仪用于找出光纤故障点。通过本发明能够第一时间获取光纤故障情况，缩短故障处理时间。

Description

一种集成光时域反射仪的光线路保护系统 技术领域
本发明涉及通信网络中的光线路保护领域，具体涉及一种集成光时域反射仪的光线路保护系统。
背景技术
在OTN(Optical Transport Network，光传送网)和WDM(Wavelength Division Multiplexing，波分复用)网络中，每根光纤都承载着大量的信息的传输，例如80×100G系统，一旦光纤发生故障，将带来严重的后果或损失，因此，为了有效地保护光纤中信息的正常传输，光线路保护被广泛地在光传输领域使用，光线路保护一般分为1+1和1：1两种保护形式。
当光线路保护单元检测到光纤故障时，便会对光进行在主用或备用线路光纤上的切换，以此来保证信息的正常传输，同时告警提示维护人员来修复光纤，光纤的修复需要维护人员先携带OTDR(Optical Time Domain Reflectometer，光时域反射仪)赶赴设备机房，测试光纤，寻找到断点，再前往故障点进行修复。上述光纤故障处理方式所需时间极长，且对维修人员的技术要求也较高。
发明内容
针对现有技术中存在的缺陷，本发明的目的在于提供一种集成光时域反射仪的光线路保护系统，能够第一时间获取光纤故障情况，缩短故障处理时间。
为达到以上目的，本发明采取的技术方案是：包括：发送端和接 收端，所述发送端和接收端之间通过光纤连接，所述发送端和接收端均设置有用于光线路切换的光线路保护单元，所述光线路保护单元集成有光时域反射仪，所述光时域反射仪用于找出光纤故障点。
在上述技术方案的基础上，所述发送端和接收端均还包括一光监控信道单元和两个光功率放大器、所述光功率放大器和光监控信道单元均与其同端的光线路保护单元相连，所述发送端中的光线路保护单元和所述接收端中的光线路保护单元之间通过两路光纤连接，每路光纤均包括主用线路光纤和备用线路光纤。
在上述技术方案的基础上，所述发送端和接收端的光线路保护单元均包括：
三个光滤波器，其包括第一光滤波器、第二光滤波器和第三光滤波器；
一个1:2耦合器，且所述1:2耦合器连接第一光滤波器；
光时域反射仪，其连接一1×2光开关，所述1×2光开关与所述第二光滤波器和第三光滤波器相连，且所述第三光滤波器还连接一光功率检测单元；
一2×2光开关，所述2×2光开关与所述第二光滤波器和第三光滤波器相连。
在上述技术方案的基础上，所述第一光滤波器连接同端的一光功率放大器和光监控信道单元，所述第二光滤波器连接同端的另一光功率放大器和光监控信道单元。
在上述技术方案的基础上，所述发送端的光线路保护单元的1:2耦合器和2×2光开关分别与接收端的光线路保护单元的2×2光开关和1:2耦合器各通过一路光纤相连。
在上述技术方案的基础上，所述发送端和接收端的光线路保护单 元均包括：
三个光滤波器，其包括第一光滤波器、第二光滤波器和第三光滤波器；
一个1:2耦合器，且所述1:2耦合器连接第一光滤波器；
二个2×2光开关，其中一个2×2光开关与所述第一光滤波器和1:2耦合器相连，另一个与所述第二光滤波器和第三光滤波器相连；
光时域反射仪，其连接一1×2光开关，所述1×2光开关与所述第二光滤波器和第三光滤波器相连，且所述第三光滤波器还连接一光功率检测单元。
在上述技术方案的基础上，所述第一光滤波器连接同端的一光功率放大器，所述1:2耦合器连接同端的光监控信道单元，所述第二光滤波器连接同端的另一光功率放大器和光监控信道单元。
在上述技术方案的基础上，所述发送端的光线路保护单元的连接有第一光滤波器的2×2光开关与接收端的光线路保护单元的连接有第二光滤波器的2×2光开关通过一路光纤相连，发送端的光线路保护单元的另一2×2光开关与接收端的光线路保护单元另一2×2光开关通过另一路光纤相连。
与现有技术相比，本发明的优点在于：将光时域反射仪集成到光线路保护单元中，当光纤发生故障时，可立即对光纤进行扫描，得到光纤故障点，极大地减少光纤故障的处理时间，且光时域反射仪的扫描光的波长与业务光的波长不同，这样可以对已经故障的光纤进行扫描，也可以对承载业务的光纤进行在线扫描。
附图说明
图1为本发明的一种集成光时域反射仪的光线路保护系统结构示意图；
图2为1+1保护系统的结构示意图；
图3为1:1保护系统的结构示意图。
具体实施方式
以下结合附图对本发明作进一步详细说明。
参见图1所示，本发明提供一种集成光时域反射仪的光线路保护系统,包括发送端和接收端，发送端和接收端之间通过光纤连接以进行数据传输，发送端和接收端均设置有用于光线路切换的光线路保护单元，当传输业务光的工作线路光纤发生故障时，光线路保护单元能够自动将业务光从主用线路光纤切换到备用线路光纤(或从备用线路光纤切换到主用线路光纤)，从而提高光纤线路的可用性，增强通信系统的可靠性，光线路保护单元集成有光时域反射仪，所述光时域反射仪用于找出光纤故障点，光时域反射仪通过向光纤中发射扫描光，找出光纤故障点，且扫描光与光纤中的其它光一并传输，如业务光。发送端和接收端均还包括一光监控信道单元和两个光功率放大器、光功率放大器和光监控信道单元均与其同端的光线路保护单元相连，发送端中的光线路保护单元和接收端中的光线路保护单元之间通过两路光纤连接，每路光纤均包括主用线路光纤和备用线路光纤。
本发明中的一种集成光时域反射仪的光线路保护系统适用于光线路的1+1保护系统和1:1保护系统。
参见图2所示，在1+1保护系统中，发送端和接收端的光线路保护单元均包括：三个光滤波器、一个1:2耦合器、光时域反射仪和一2×2光开关，三个光滤波器分别为第一光滤波器、第二光滤波器和第三光滤波器；1:2耦合器连接第一光滤波器；光时域反射仪连接1×2光开关，1×2光开关与第二光滤波器和第三光滤波器相连，且第三光滤波器还连接一光功率检测单元；2×2光开关与第二光滤波 器和第三光滤波器相连。第一光滤波器连接同端的一光功率放大器和光监控信道单元，第二光滤波器连接同端的另一光功率放大器和光监控信道单元。发送端的光线路保护单元的1:2耦合器和2×2光开关分别与接收端的光线路保护单元的2×2光开关和1:2耦合器各通过一路光纤相连。
发送端的光纤所传输的业务光经光功率放大器放大后和光监控信道单元发出的光在第一光滤波器中进行合波，合波后的光经1:2耦合器后成为两路，分别输出到一路光纤的主用线路光纤和备用线路光纤中，然后发送给对端接收端的2×2光开关；对端站点的主用线路光纤和备用线路光纤中的从接收端到发送端的光经2×2光开关后，一路光经第二光滤波器分离后分别输出到光功率放大器和光监控信道单元，另一路光经第三光滤波器后，进入到光功率检测单元，光时域反射仪将扫描光经1×2光开关后，再由第二光滤波器和第三光滤波器反向注入到与2×2光开关相连的主用线路光纤或备用线路光纤中。接收端的光的走向与发送端的相同。
参见图3所示，在1:1保护系统中，发送端和接收端的光线路保护单元均包括：三个光滤波器、一个1:2耦合器、二个2×2光开关和光时域反射仪，三个光滤波器分别为第一光滤波器、第二光滤波器和第三光滤波器；1:2耦合器连接第一光滤波器；二个2×2光开关中的一个2×2光开关与第一光滤波器和1:2耦合器相连，另一个与第二光滤波器和第三光滤波器相连；光时域反射仪连接一1×2光开关，1×2光开关与第二光滤波器和第三光滤波器相连，且第三光滤波器还连接一光功率检测单元。第一光滤波器连接同端的一光功率放大器，1:2耦合器连接同端的光监控信道单元，第二光滤波器连接同端的另一光功率放大器和光监控信道单元。发送端的光线路保护单元的 连接有第一光滤波器的2×2光开关与接收端的光线路保护单元的连接有第二光滤波器的2×2光开关通过一路光纤相连，发送端的光线路保护单元的另一2×2光开关与接收端的光线路保护单元另一2×2光开关通过另一路光纤相连。
发送端的光监控信道单元发出的光经1:2耦合器进行分光后，一路与来自光功率放大器的业务光在第一光滤波器中进行合波后进入到一2×2光开关中，另一路直接进入到该2×2光开关中，该2×2光开关中的这两路光分别输出到一路光纤的主用线路光纤和备用线路光纤中，2×2光开关调整选择哪一路进主用线路光纤，哪一路进备用线路光纤，然后发送给接收端，对端站点的接收端从主用线路光纤和备用线路光纤中的光经另一2×2光开关后，一路光经第二光滤波器分离后分别输出到光功率放大器和光监控信道单元，另一路光经第三光滤波器后，进到光功率检测单元，光时域反射仪将扫描光经1×2光开关后，再由第二光滤波器和第三光滤波器反向注入到与2×2光开关相连的一路主用线路光纤或备用线路光纤中。接收端光的走向和发送端的相同。
上述1+1保护系统和1:1保护系统中的业务光、光监控信道单元发出的光、光时域反射仪发出的扫描光的波长不同，这样可以在不影响正常信息传输的同时对光纤进行扫描。通过在光线路保护单元中集成光时域反射仪，当光纤线路发生故障时，光时域反射仪立即发出扫描光对光纤进行扫描，获取故障点信息。当然，光时域反射仪也可以定期发出扫描光对光纤进行扫描，对异常的点提前处理，降低事故的发生概率。
本发明不局限于上述实施方式，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰， 这些改进和润饰也视为本发明的保护范围之内。本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。

Claims (8)

  1. 一种集成光时域反射仪的光线路保护系统，其特征在于，包括：发送端和接收端，所述发送端和接收端之间通过光纤连接，所述发送端和接收端均设置有用于光线路切换的光线路保护单元，所述光线路保护单元集成有光时域反射仪，所述光时域反射仪用于找出光纤故障点。
  2. 如权利要求1所述的一种集成光时域反射仪的光线路保护系统，其特征在于：所述发送端和接收端均还包括一光监控信道单元和两个光功率放大器、所述光功率放大器和光监控信道单元均与其同端的光线路保护单元相连，所述发送端中的光线路保护单元和所述接收端中的光线路保护单元之间通过两路光纤连接，每路光纤均包括主用线路光纤和备用线路光纤。
  3. 如权利要求2所述的一种集成光时域反射仪的光线路保护系统，其特征在于，所述发送端和接收端的光线路保护单元均包括：
    三个光滤波器，其包括第一光滤波器、第二光滤波器和第三光滤波器；
    一个1:2耦合器，且所述1:2耦合器连接第一光滤波器；
    光时域反射仪，其连接一1×2光开关，所述1×2光开关与所述第二光滤波器和第三光滤波器相连，且所述第三光滤波器还连接一光功率检测单元；
    一2×2光开关，所述2×2光开关与所述第二光滤波器和第三光滤波器相连。
  4. 如权利要求3所述的一种集成光时域反射仪的光线路保护系统，其特征在于：所述第一光滤波器连接同端的一光功率放大器和光监控信道单元，所述第二光滤波器连接同端的另一光功率放大器和光 监控信道单元。
  5. 如权利要求4所述的一种集成光时域反射仪的光线路保护系统，其特征在于：所述发送端的光线路保护单元的1:2耦合器和2×2光开关分别与接收端的光线路保护单元的2×2光开关和1:2耦合器各通过一路光纤相连。
  6. 如权利要求2所述的一种集成光时域反射仪的光线路保护系统，其特征在于，所述发送端和接收端的光线路保护单元均包括：
    三个光滤波器，其包括第一光滤波器、第二光滤波器和第三光滤波器；
    一个1:2耦合器，且所述1:2耦合器连接第一光滤波器；
    二个2×2光开关，其中一个2×2光开关与所述第一光滤波器和1:2耦合器相连，另一个与所述第二光滤波器和第三光滤波器相连；
    光时域反射仪，其连接一1×2光开关，所述1×2光开关与所述第二光滤波器和第三光滤波器相连，且所述第三光滤波器还连接一光功率检测单元。
  7. 如权利要求6所述的一种集成光时域反射仪的光线路保护系统，其特征在于：所述第一光滤波器连接同端的一光功率放大器，所述1:2耦合器连接同端的光监控信道单元，所述第二光滤波器连接同端的另一光功率放大器和光监控信道单元。
  8. 如权利要求7所述的一种集成光时域反射仪的光线路保护系统，其特征在于：所述发送端的光线路保护单元的连接有第一光滤波器的2×2光开关与接收端的光线路保护单元的连接有第二光滤波器的2×2光开关通过一路光纤相连，发送端的光线路保护单元的另一2×2光开关与接收端的光线路保护单元另一2×2光开关通过另一路光纤相连。
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