WO2012024871A1 - 无源光网络中进行光纤故障诊断的方法及光线路终端 - Google Patents

无源光网络中进行光纤故障诊断的方法及光线路终端 Download PDF

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Publication number
WO2012024871A1
WO2012024871A1 PCT/CN2010/079343 CN2010079343W WO2012024871A1 WO 2012024871 A1 WO2012024871 A1 WO 2012024871A1 CN 2010079343 W CN2010079343 W CN 2010079343W WO 2012024871 A1 WO2012024871 A1 WO 2012024871A1
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Prior art keywords
test
module
optical
data
fault diagnosis
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English (en)
French (fr)
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梁伟
陆建鑫
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ZTE Corp
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ZTE Corp
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Priority to US13/817,897 priority Critical patent/US20130148958A1/en
Priority to EP10856323.0A priority patent/EP2600543A4/en
Publication of WO2012024871A1 publication Critical patent/WO2012024871A1/zh
Anticipated expiration legal-status Critical
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071Arrangements 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]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27Arrangements for networking
    • H04B10/272Star-type networks or tree-type networks

Definitions

  • the present invention relates to the field of optical access networks, and in particular to an optical time domain reflectometer
  • OTDR Optical Time Domain Reflectometer
  • PON Passive Optical Network
  • OLT optical line terminal
  • ONU optical network unit
  • ODN optical distribution network
  • PON network deployments that use the following test schemes, that is, configure multi-channel OTDR test equipment at the central office of the PON network, and use optical switches and couplers to connect the test channels of the OTDR to the OLTs of the PON system.
  • the PON network management system is used to monitor and manage the OTDR test equipment.
  • This method can meet the timeliness and maintainability of fault diagnosis.
  • the networking structure is complex, and the introduction of optical switches and other devices greatly increases the operating cost of the network.
  • one OTDR device at the central office tests many PONs. OLT fiber-optic lines, once the instrument fails, will affect the testing of multiple PON networks, and there are hidden dangers in reliability.
  • the technical problem to be solved by the present invention is to provide a method for optical fiber fault diagnosis and an optical line terminal in a passive optical network, and apply the OTDR technology to the PON OLT design, so that the PON network device itself has the capability of fiber fault diagnosis. Simplifies the networking structure of the system.
  • the present invention provides a method for performing fiber fault diagnosis in a passive optical network, the method comprising: triggering a test module after receiving a diagnostic fiber fault message by a receiving module of the optical line terminal; After the module is triggered by the receiving module, the optical time domain reflection test is performed to obtain test data information; and the fault diagnosis module analyzes the data information to perform fiber fault diagnosis.
  • the test module performs the optical time domain reflection test according to the preset optical time domain reflection test parameter; wherein the optical time domain reflection test parameter includes: the type of the test optical signal And measuring a waveform parameter of the optical signal, a sampling rate, an analog-to-digital conversion bit width, and a sampling start time; the type of the test optical signal is an optical pulse, and a waveform parameter of the test optical signal is a width of the optical pulse; or The type of the test optical signal is a pseudo random sequence, and the waveform parameter of the test optical signal is the length of the pseudo random sequence.
  • the optical time domain reflection test parameter includes: the type of the test optical signal And measuring a waveform parameter of the optical signal, a sampling rate, an analog-to-digital conversion bit width, and a sampling start time; the type of the test optical signal is an optical pulse, and a waveform parameter of the test optical signal is a width of the optical pulse; or The type of the test optical signal is a pseudo random sequence, and the waveform parameter of the test optical signal is the
  • the method further includes: the testing module encapsulating the data information and test parameters into a data format required for fiber fault diagnosis, and then transmitting the data format to the fault diagnosis module.
  • the receiving module triggers the test module by using an I2C management interface; the test module sends the encapsulated data to the fault diagnosis module through a serial data interface, where the serial data interface is a single-ended serial data interface or A pair of differential serial data interfaces.
  • the step of the test module packaging the data information and the test parameter into a data format required for fiber fault diagnosis comprises: encapsulating the test parameter into a frame header field, and encapsulating the data information into a data field, where A preamble field for identifying optical time domain reflection test data is added before the frame header field, and a check bit field is added after the data field.
  • the step of analyzing the data information by the fault diagnosis module includes: if detecting the preamble field for identifying optical time domain reflection test data, and verifying data of the check bit field is successful, according to the Extracting, from the frame header field, the test parameter analyzes the data information in the data field.
  • the method further includes: reporting the result of the fiber fault diagnosis to the upper network management system.
  • the present invention further provides an optical line terminal, which includes a control module and an optical module.
  • the control module is configured to: control the optical module to receive and receive services; and the control module includes a receiving module and a fault.
  • a diagnostic module the optical module includes a test module, and the receiving module is configured to: send a trigger message to the test module when receiving the diagnostic fiber fault message; the test module is configured to: after receiving the trigger message, Performing an optical time domain reflectometry test to obtain test data information;
  • the fault diagnosis module is configured to: analyze the data information to perform fiber fault diagnosis.
  • the test module is configured to perform an optical time domain reflectance test as follows: Perform an optical time domain reflectance test according to a preset optical time domain reflectance test parameter, where the optical time domain reflectance test parameter includes: a type of the test optical signal, Testing a waveform parameter of the optical signal, a sampling rate, an analog-to-digital conversion bit width, and a sampling start time, wherein the type of the test optical signal is an optical pulse, and a waveform parameter of the test optical signal is a width of the optical pulse; or The type of the test optical signal is a pseudo-random sequence, and the waveform parameter of the test optical signal is the length of the pseudo-random sequence.
  • the test module includes: a sending control unit, configured to: send a control command to the light emitting unit according to the test parameter; and the light emitting unit is configured to: after receiving the control command, according to the type of the test optical signal And transmitting a corresponding test optical signal to perform an optical time domain reflection test on the waveform parameter of the test optical signal; and receiving processing unit configured to: after receiving the data information obtained by the optical time domain reflection test, the data information and the test After the parameters are encapsulated into the data format required for fiber fault diagnosis, the parameters are sent to the fault diagnosis module.
  • the data format includes: a preamble field, a frame header field, a data field, and a check bit field, where the preamble field is bitstream information used to identify optical time domain reflection test data, and the frame header field includes The test parameter, the data field includes the data information.
  • the fault diagnosis module is configured to analyze the data information as follows: after detecting that the preamble field is for identifying light time domain reflection test data, and successfully verifying data of the check bit field, according to The test parameters extracted from the frame header field are analyzed for the data information in the data field.
  • the optical module further includes an I2C management interface and a serial data interface, where the test module receives the trigger message through the I2C management interface; the test module sends a package to the fault diagnosis module by using the serial data interface.
  • the serial data interface is a single-ended serial data interface or a pair of differential serial data interfaces.
  • the fault diagnosis module is further configured to: report the result of the fiber fault diagnosis to the upper network management system.
  • the line terminal firstly, combines the PON network management system to perform the fiber fault diagnosis process to meet the requirements of timeliness and maintainability. Further, the OTDR technology is applied to the PON OLT design, so that the PON network device itself has the fiber fault diagnosis capability and is simplified.
  • the networking structure of the system at the same time, the method of the invention does not need to introduce other devices or components other than the OTDR component, thereby reducing the operating cost of the network; again, the method of the invention enables the optical fault diagnosis in each OLT domain to be independently performed.
  • the system can be used to improve the reliability of the system.
  • the faults in the OLT domain can be reported to the upper-layer NMS for centralized processing to improve the manageability and maintainability of the fault information of the PON system.
  • Figure 1 shows a basic structure of a passive optical network (PON);
  • Figure 2 shows an OLT of the present invention.
  • Figure 3 is a schematic view of a test module of the present invention;
  • FIG. 5 is a schematic diagram of an OLT of the present embodiment
  • FIG. 6 is a schematic diagram of an optical module of an OLT according to the embodiment
  • FIG. 7 is a schematic diagram of an OTDR test module of the OLT according to the embodiment
  • FIG. 2 is a schematic diagram of an optical line terminal according to the present invention. As shown in FIG.
  • the optical line terminal of this embodiment includes: a control module and an optical module, where the control module is used for service processing and system management of the optical line terminal, including controlling the The optical module transceiver service, wherein the control module includes a receiving module and a fault diagnosis module, and has a control management and data analysis function for the optical time domain reflectometer test module, where the optical module includes a test module; wherein the receiving module is configured After receiving the diagnostic fiber fault message, sending a trigger message to the test module; the test module is configured to: after receiving the trigger message, perform an optical time domain reflection test to obtain test data information; The diagnostic module is configured to: analyze the data information for fiber fault diagnosis.
  • the test module is configured to perform an optical time domain reflection test according to a preset optical time domain reflection test parameter.
  • the optical time domain reflection test parameter includes: a type of the test optical signal, a waveform parameter of the test optical signal, a sampling rate, an analog-to-digital conversion bit width, and a sampling start time, wherein the type of the test optical signal is a light pulse, The waveform parameter of the test optical signal is the width of the optical pulse; or the type of the test optical signal is a pseudo-random sequence, and the waveform parameter of the test optical signal is the length of the pseudo-random sequence. .
  • the optical module includes an I2C management interface and a serial data interface
  • the test module receives the trigger message through the I2C management interface; the test module sends the fault diagnosis module to the fault diagnosis module by using the serial data interface
  • the encapsulated data is transmitted, and the serial data interface is a single-ended serial data interface or a pair of differential serial data interfaces.
  • the test module of this embodiment may include a sending control unit, a lighting unit, and a receiving processing unit. As shown in FIG.
  • the sending control unit is configured to: send a control instruction to the lighting unit according to the test parameter;
  • the method is as follows: after receiving the control instruction, sending a corresponding test light signal according to the type of the test optical signal and the waveform parameter of the test optical signal to perform an optical time domain reflection test; the receiving processing unit is configured to: receive the light
  • the data information obtained by the domain reflection test is encapsulated into a data format required for fiber fault diagnosis, the data information is sent to the fault diagnosis module.
  • the data format includes: a preamble field, a frame header field, a data field, and a check bit field, where the preamble field is bitstream information used to identify optical time domain reflection test data, the frame header
  • the field includes test parameters, and the data field is data information obtained by the test.
  • the test parameter information includes at least: type information of the test optical signal, waveform information of the test optical signal, analog-to-digital conversion sample rate information, analog-to-digital conversion bit width information, and sample start time information.
  • the fault diagnosis module is further configured to: after detecting that the preamble field is used to identify optical time domain reflection test data, and successfully verify data of the check bit field, according to the frame header
  • the test parameter extracted from the field analyzes the data information in the data field.
  • the optical module includes an I2C management interface and a serial data interface, and the test module receives the trigger message through the I2C management interface; the test module sends the fault diagnosis module to the fault diagnosis module by using the serial data interface
  • the encapsulated data is transmitted, and the serial data interface is a single-ended serial data interface or a pair of differential serial data interfaces.
  • control module is further configured to: send the result information of the fiber fault diagnosis to the upper network management system.
  • the optical fiber fault signal on each device can be sent to the upper network management system for centralized analysis and processing.
  • the method of this embodiment may include the following steps:
  • the receiving module of the optical line terminal After receiving the diagnostic fiber fault message, the receiving module of the optical line terminal triggers the test module.
  • test module After the test module is triggered by the receiving module, perform an optical time domain reflection test to obtain test data information.
  • the fault diagnosis module analyzes the data information to perform fiber fault diagnosis.
  • the method of the embodiment can implement optical fiber fault diagnosis by the optical line terminal itself, meets the requirements of timeliness and maintainability, and does not require other equipment or components, thereby simplifying the networking structure of the system.
  • the test module in step S20 performs an optical time domain reflection test according to a preset optical time domain reflection test parameter.
  • the optical time domain reflection test parameter may include: testing a type of the optical signal, and testing the light. Waveform parameters of the signal, sample rate, analog-to-digital conversion bit width, and sample start time.
  • the type of the test optical signal is a light pulse, and the waveform parameter of the test light signal is a width of the light pulse; or the type of the test light signal is a pseudo random sequence, and the waveform parameter of the test light signal is pseudo random The length of the sequence.
  • the test module may further include: the test module encapsulates the data information and the test parameter into a data format required for fiber fault diagnosis, and then sends the data format. Give the fault diagnosis module.
  • the receiving module triggers the test module by using an I2C management interface; the test module sends the encapsulated data to the fault diagnosis module through a serial data interface, where the serial data interface is a single-ended string Row data interface or a pair of differential serial data interfaces.
  • the step of the test module packaging the data information and the test parameter into a data format required for fiber fault diagnosis comprises: encapsulating the test parameter into a frame header field, and encapsulating the data information into a data field, A preamble field for identifying optical time domain reflection test data is added before the frame header field, and a check bit field is added after the data field.
  • the step of analyzing the data information by the fault diagnosis module in step S30 includes: if detecting the preamble field for identifying optical time domain reflection test data, and verifying data of the check bit field If successful, the data information in the data field is analyzed according to the test parameter extracted from the frame header field. Further, after the step of performing the fiber fault diagnosis, the fault diagnosis module further includes: reporting the result of the fiber fault diagnosis to the upper network management system. In this way, the upper-layer network management can perform centralized analysis and processing on the fiber fault signal.
  • FIG. 5 is a schematic diagram of the OLT according to the embodiment.
  • the optical module of the OLT includes an OTDR test module, which can be in the optical module of the OLT.
  • the OTDR test is completed, and the test data is transmitted to the control module of the OLT through the OTDR data interface dedicated to the optical module; the control module of the OLT completes the analysis and fault location of the test data; meanwhile, the control module of the OLT passes the optical module management interface (for example, The I2C management interface of the optical module can control and manage the OTDR test.
  • the I2C management interface of the optical module can control and manage the OTDR test.
  • the method in this embodiment can complete the fiber fault diagnosis process of the system in the PON OLT device; the method in this embodiment can also use the uplink management channel of the PON system to give fault conditions in each OLT domain to The upper layer network management performs centralized processing.
  • the optical module in this embodiment needs to be improved on the basis of the traditional PON OLT optical module in combination with the test requirements, as shown in FIG. 6.
  • this embodiment adds an OTDR function component (ie, an OTDR test module) to the OLT optical module to complete the OTDR online test and data conversion process; the wavelength of the test optical signal of the OTDR can be selected from 1625 nm or 1650 nm.
  • the optical module of the OLT in this embodiment may add a single-ended data interface or a pair of differential serial data interfaces to complete high-speed transmission of data signals after the OTDR test. If there are multiple optical modules on the OLT, the control module can test the OTDR in multiple optical modules and optical modules through the I2C management interface.
  • the module is managed in a unified manner.
  • the ROSA in Figure 6 is the original service receiving module of the optical module, and the TOSA is the original service sending module in the optical module.
  • the invention adds the OTDR test module to the optical module without affecting the normal operation of the ROSA and the TOSA.
  • the OTDR test module of this embodiment can complete the process of sending, receiving, and controlling the OTDR test, as shown in FIG. 7.
  • the OTDR test module may include a transmission control unit, a lighting unit, and a receiving processing unit.
  • the transmission control unit can complete the transmission control function of the optical signal of the OTDR test, and can select the type of the test optical signal and the control signal waveform according to the instruction of the control module, and control the illumination unit to emit a predetermined test light signal.
  • the test optical signal type of the OTDR test module can select an optical pulse or a pseudo-random sequence; at the same time, the width of the transmitted optical pulse and the length of the pseudo-random sequence can also be controlled.
  • the light emitting unit may be a semiconductor laser, a laser diode or the like, and the light emitting unit may emit a predetermined test light signal according to a control command of the transmission control unit, for example, a pulse of a specified width capable of emitting a wavelength of 1625 nm or 1650 nm, which may be transmitted to the optical fiber via the fiber coupler.
  • the receiving processing unit is configured to receive the optical signal obtained by the OTDR test, process the optical signal, and send the optical signal to the control module.
  • the optical signal sent back from the fiber coupler passes through the photodetector, the amplifier, and the A/D converter and enters the receiving processing unit.
  • the receiving processing unit can complete the data signal buffering function, and can control the startup of the A/D converter, set the sampling rate of the A/D conversion, and calculate the sampling start time and the completed data format processing; the processing by the receiving processing unit After that, the data obtained by the test is converted to the control module of the OLT through the OTDR data interface defined on the optical module after parallel-to-serial conversion.
  • the optical module management interface uses the existing I2C management interface of the optical module.
  • the I2C interface is connected to the OTDR function component added to the optical module to complete the OTDR test process.
  • Control and management The control module of the OLT adds the OTDR management and data analysis functions under the premise of retaining the original service processing and system management functions of the OLT, and can initiate an OTDR test process through the optical module management interface, and can set the OTDR test parameters, which can be completed. Analysis and failure of test data The positioning process.
  • the OTDR test module uses a fixed-width optical pulse and a default sample rate for testing; meanwhile, the transmit control unit of the OTDR test module provides an optional optical pulse or pseudo-random The test mode of the sequence; in the selected test mode, an optional optical pulse width or pseudo-random sequence length is also provided.
  • the receive processing module of the OTDR test module also provides an optional sample rate.
  • the system When the OLT's control module initiates an OTDR test through the optical module management interface, the system simultaneously starts the A/D converter in the OTDR test module of the optical module, and receives the timing module in the processing unit.
  • the timing module can be used to calculate the time from when the illumination unit starts to emit light until the receiving processing unit receives the data signal obtained by the first group of tests; after the A/D conversion of the test signal, the data is buffered; and then, the time of the timing module is subtracted.
  • the system transfer and processing delays can be used to calculate the sample time of the first sample.
  • the receiving processing unit encapsulates the necessary test parameters, the test data and the check digit into a system-consistent data format, and performs data serialization processing; finally, the OTDR data interface of the optical module is transmitted to the control module of the OLT for analysis. And fault location.
  • FIG. 8 is a schematic diagram of a data format of an OTDR test data according to an embodiment of the present invention.
  • the data format agreed by the system in this embodiment includes: a preamble field, a frame header field, a data field, and a checksum. Bit field.
  • the preamble field is specific bit stream information agreed by the system;
  • the frame header field mainly includes test parameters, and the test parameters should at least include: test mode (ie, type information of the test optical signal), waveform information of the test optical signal (including optical pulses) Information such as width or pseudo-random sequence length), sample rate, A/D bit width, and sample start time;
  • data field is test data stream information, and the effective length of the data field is based on the maximum sample rate of the OTDR test module and A/ The D conversion bit width is determined, the total length of the data field is fixed, and the data field length should at least contain all test data under the maximum sampling rate.
  • the check bit field is added by the agreed check algorithm when the data is encapsulated, and is used to complete the data verification at the receiving end.
  • the control module of the OLT receives the test data sent by the optical module
  • the OTDR test data frame is detected according to the agreed preamble, and then the data check is performed according to the check bit.
  • the calibration is performed according to a predetermined Cyclic Redundancy Check (CRC). If the verification fails, the transmission is incorrect, and the OTDR test module in the optical module is required to retransmit; otherwise, the frame header information is
  • CRC Cyclic Redundancy Check
  • the upper network management system of the PON network system monitors the running status of the system in a timely manner. When it is determined that the optical fiber fault occurs, the corresponding OLT is triggered, and step S102 is performed. If other faults are determined, other fault processing is performed.
  • the OLT initiates an OTDR test. Specifically, the control module of the PON OLT initiates an OTDR test command through the optical module management interface, and starts the OTDR test process in due course.
  • step S105 determining whether to use the default configuration, and if so, then proceeding to step S105, otherwise, proceeding to step S104;
  • test parameters may include: test optical signal type, optical pulse width or pseudo-random sequence length, and optical time domain reflection. Instrument test sample rate and so on.
  • the signal obtained by the test is processed; specifically, the receiving processing unit of the OTDR test module in the optical module performs analog-to-digital conversion and processing on the signal obtained by the test, and completes data format encapsulation; OTDR through the optical module
  • the data interface transmits the test data to the control module of the PON OLT.
  • the control module of the PON OLT extracts the OTDR test parameters and test data, completes the analysis of the OTDR test data, and completes the fiber fault location process.
  • step S109 it is determined whether it is necessary to submit the upper layer network management, if yes, then go to step S109, otherwise, go to step S110;
  • the upper-layer network management system performs centralized processing. Specifically, according to the system management and maintenance requirements, if the network deployment requires the upper-layer network management and management system fault information, the faults in the OLT domain are processed to the upper-layer network management system through the uplink management channel of the PON OLT system.
  • PON OLT completes the maintenance and management of fault information by itself, and the test is completed.
  • the OTDR test technology is applied to the system design of the PON OLT, and the OTDR function component and the data interface are added to the OLT optical module; the OTDR management and data analysis functions are added to the control module of the OLT, so that when a fiber failure occurs,
  • the control module of the OLT can issue an instruction through the optical module management interface to initiate the OTDR fault diagnosis process.
  • the data obtained by the test is sent back to the OLT control module through the OTDR data interface of the optical module to complete the data analysis and fault location process.
  • the fiber fault condition of the OLT test in this embodiment can be analyzed and processed on the PON OLT to implement the fiber fault diagnosis of the PON system.
  • the fault condition in each OLT domain can also be obtained through the uplink management channel of the PON system. ⁇ Conduct centralized analysis and processing on the upper-layer network management, and finally realize fiber fault diagnosis of the PON system.
  • the method and device for PON fiber diagnosis using the OTDR technology proposed by the present invention firstly combines the fiber fault diagnosis process with the PON network management system to meet the requirements of timeliness and maintainability; further, the OTDR technology is applied to the PON OLT design.
  • the PON network device itself has the capability of fiber fault diagnosis; the network structure of the system is simplified, and the method of the invention does not need to introduce other devices or components other than the OTDR component, thereby reducing the operating cost of the network;
  • the method of the invention enables the diagnosis of light faults in each OLT domain to be performed independently, thereby improving the reliability of the system.

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Description

无源光网络中进行光纤故障诊断的方法及光线路终端
技术领域 本发明涉及光接入网领域, 具体地说, 涉及一种应用光时域反射仪
( Optical Time Domain Reflectometer, OTDR )技术在无源光网络中进行光纤 故障诊断的方法和光线路终端。
背景技术 随着光纤通信技术的成熟发展和 "三网融合" 服务需求的不断推动, 光 纤到户(Fiber To The Home, FTTH )已经毋庸置疑地成为解决接入网带宽瓶 颈问题的最终手段, 而无源光网络( Passive Optical Network, PON )技术以 其高带宽、 远距离传输以及点到多点拓朴等优势备受青睐, 已经成为各国部 署 FTTH的主要应用架构。 PON是一种釆用点到多点拓朴结构的无源光接入 技术,拓朴图如图 1所示。由局侧的光线路终端( Optical Line Terminal, OLT )、 用户侧的光网络单元( Optical Network Unit, ONU )以及光分配网络( Optical Distribution Network, ODN )组成。 当前, xPON系统已经在国内外大量部署商用, 与此同时, PON网络的 运营维护技术也不断发展壮大。 在光纤故障诊断方面, 借助 OTDR进行光纤 故障诊断仍然是 PON系统的首选方案。 针对 PON网络中 ODN引入高损耗 及点到多点的拓朴特点,业界已经研制出具备高分辨率和大动态范围的 PON 优化型 OTDR设备, 并且提出了一些解决点到多点测试的方法和技术, 能够 满足 PON网络测试需求; 同时, PON优化型 OTDR设备引入带外测试波长 λχ, 可以实现 PON网络的在线测试。 当前, 虽然使用 OTDR设备进行 PON 网络光纤故障诊断已经没有技术上的困难, 但是, 这种传统测试手段存在的 固有弱点始终没有得到改善。 传统 PON 光纤故障诊断的最基本形式是 OTDR故障诊断设备独立于 PON网络, 当网络发生故障后, 测试人员再将 OTDR设备接入 PON网络完 成测试; 测试启动过程缺乏适时性(其中, 适时性是指软件发现故障后能适 时启动测试, 软件可控) ; 同时, 测试结果也缺乏可维护性。 现在, 也有一 些 PON网络部署釆用如下的测试方案, 即在 PON网络的局端配置多通道的 OTDR测试设备,使用光开关以及耦合器将 OTDR的各测试通道分别接入到 PON系统的各 OLT下行光纤线路上;同时,使用 PON网络管理系统对 OTDR 测试设备进行监控和管理。这种方式可以满足故障诊断的适时性和可维护性; 但是组网结构复杂, 而且, 光开关等设备的引入也大大地提高了网络的运营 成本; 同时, 局端一台 OTDR设备测试很多 PON OLT光纤线路, 一旦仪表 出现故障, 将影响多个 PON网络的测试, 在可靠性方面存在隐患。
发明内容 本发明要解决的技术问题是提供一种在无源光网络中进行光纤故障诊断 的方法和光线路终端,将 OTDR技术应用 PON OLT设计当中,使 PON网络 设备自身具备了光纤故障诊断能力, 简化了系统的组网结构。 为了解决上述技术问题, 本发明提供了一种在无源光网络中进行光纤故 障诊断的方法, 该方法包括: 光线路终端的接收模块接收到诊断光纤故障消息后, 触发测试模块; 所述测试模块被所述接收模块触发后, 进行光时域反射测试, 得到测试 的数据信息; 以及 故障诊断模块分析所述数据信息, 进行光纤故障诊断。 进行光时域反射测试的步骤中, 所述测试模块是根据预设的光时域反射 测试参数进行光时域反射测试的; 其中, 所述光时域反射测试参数包括: 测 试光信号的类型、 测试光信号的波形参数、 釆样率、 模数转换位宽和釆样开 始时间; 所述测试光信号的类型为光脉冲, 所述测试光信号的波形参数为光脉冲 的宽度; 或者, 所述测试光信号的类型为伪随机序列, 所述测试光信号的波 形参数为伪随机序列的长度。 所述测试模块进行光时域反射测试, 得到测试的数据信息的步骤之后, 所述方法还包括: 所述测试模块将所述数据信息和测试参数封装成光纤故障诊断所需的数 据格式, 然后发送给所述故障诊断模块。 所述接收模块通过 I2C管理接口触发所述测试模块; 所述测试模块通过串行数据接口向所述故障诊断模块发送封装后的数 据, 所述串行数据接口为一个单端串行数据接口或一对差分串行数据接口。 所述测试模块将所述数据信息和测试参数封装成光纤故障诊断所需的数 据格式的步骤包括: 将所述测试参数封装为帧头字段, 将所述数据信息封装为数据字段, 在 所述帧头字段前加入用于标识光时域反射测试数据的前导码字段, 在所述数 据字段后加入校验位字段。 所述故障诊断模块分析所述数据信息的步骤包括: 若检测所述前导码字段用于标识光时域反射测试数据, 并且对所述校验 位字段的数据校验成功, 则根据从所述帧头字段中提取出所述测试参数分析 所述数据字段中的所述数据信息。 所述故障诊断模块进行光纤故障诊断的步骤之后, 所述方法还包括: 将光纤故障诊断的结果信息上报给上层网管。 为了解决上述技术问题, 本发明还提供了一种光线路终端, 其包括控制 模块和光模块; 其中, 所述控制模块设置为: 控制所述光模块收发业务; 所述控制模块包括接收模块和故障诊断模块,所述光模块包括测试模块; 所述接收模块设置为: 接收到诊断光纤故障消息时, 向所述测试模块发 送触发消息; 所述测试模块设置为: 接收到所述触发消息后, 进行光时域反射测试, 得到测试的数据信息; 所述故障诊断模块设置为: 分析所述数据信息, 进行光纤故障诊断。 所述测试模块是设置为按如下方式进行光时域反射测试: 根据预设的光 时域反射测试参数进行光时域反射测试, 所述光时域反射测试参数包括: 测 试光信号的类型、 测试光信号的波形参数、 釆样率、 模数转换位宽和釆样开 始时间, 所述测试光信号的类型为光脉冲, 所述测试光信号的波形参数为光脉冲 的宽度; 或者, 所述测试光信号的类型为伪随机序列, 所述测试光信号的波 形参数为伪随机序列的长度。 所述测试模块包括: 发送控制单元,其设置为:根据所述测试参数向发光单元下发控制指令; 发光单元, 其设置为: 接收到所述控制指令后, 根据所述测试光信号的 类型和测试光信号的波形参数发送相应的测试光信号进行光时域反射测试; 以及 接收处理单元,其设置为:接收所述光时域反射测试所得的数据信息后, 将所述数据信息和测试参数封装成光纤故障诊断所需的数据格式后, 发送给 所述故障诊断模块。 所述数据格式包括: 前导码字段、 帧头字段、 数据字段和校验位字段, 其中, 所述前导码字段为用于标识光时域反射测试数据的比特流信息, 所述 帧头字段包括所述测试参数, 所述数据字段包括所述数据信息。 所述故障诊断模块是设置为按如下方式分析所述数据信息: 在检测所述 前导码字段为用于标识光时域反射测试数据, 并且成功校验所述校验位字段 的数据后, 根据从所述帧头字段中提取出的所述测试参数, 分析所述数据字 段中的所述数据信息。 所述光模块还包括 I2C管理接口和串行数据接口, 所述测试模块通过所述 I2C管理接口接收所述触发消息; 所述测试模块通过所述串行数据接口向所述故障诊断模块发送封装后的 数据,所述串行数据接口为一个单端串行数据接口或一对差分串行数据接口。 所述故障诊断模块还设置为: 将所述光纤故障诊断的结果信息上报给上 层网管。
线路终端, 首先, 结合 PON网络管理系统进行光纤故障诊断过程, 满足适时 性和可维护性需求; 进一步地, 将 OTDR技术应用 PON OLT设计当中, 使 PON网络设备自身具备了光纤故障诊断能力,简化了系统的组网结构,同时, 本发明的方法无需引入除 OTDR组件以外的其他设备或组件, 降低了网络的 运营成本; 再次,这发明的方法能够使每个 OLT域内的光线故障诊断独立进 行,提高了系统的可靠性; 还可以利用 PON系统的上行管理通道,将各 OLT 域内的故障情况上报给上层网管进行集中处理,提高 PON系统故障信息的可 管理和可维护性。
附图概述 结合了附图的详细描述, 将使本发明方法的结构和过程更加直观明了, 其中: 图 1 所示为无源光网络(PON )基本结构图; 图 2为本发明的 OLT的示意图; 图 3为本发明的测试模块的示意图;
图 5为本实施例的 OLT的示意图; 图 6为本实施例的 OLT的光模块的示意图; 图 7为本实施例的 OLT的 OTDR测试模块的示意图; 图 8为本发明实施例约定的一种 OTDR测试数据的数据格式的示意图;
图。 ; 本发明的较佳实施方式 为了更好地理解本发明, 下面结合附图和具体实施例对本发明作进一步 地描述。 需要说明的是, 在不冲突的情况下, 本申请中的实施例及实施例中 的特征可以相互任意组合。 图 2为本发明的光线路终端的示意图, 如图 2所示, 本实施例的光线路 终端包括: 控制模块和光模块, 控制模块用于光线路终端的业务处理和系统 管理, 包括控制所述光模块收发业务, 其中, 控制模块包括接收模块和故障 诊断模块, 具有对所述光时域反射仪测试模块的控制管理和数据分析功能, 光模块包括一测试模块; 其中, 所述接收模块设置为: 接收到诊断光纤故障消息时, 向所述测试模块发 送触发消息; 所述测试模块设置为: 接收到所述触发消息后, 进行光时域反射测试, 得到测试的数据信息; 所述故障诊断模块设置为: 分析所述数据信息, 进行光纤故障诊断。
性和可维护性需求, 并且简化了系统的组网结构。 进一步地, 所述测试模块是设置为根据预设的光时域反射测试参数进行 光时域反射测试。 所述光时域反射测试参数包括: 测试光信号的类型、 测试光信号的波形 参数、 釆样率、 模数转换位宽和釆样开始时间, 所述测试光信号的类型为光 脉冲, 所述测试光信号的波形参数为光脉冲的宽度; 或者, 所述测试光信号 的类型为伪随机序列, 所述测试光信号的波形参数为伪随机序列的长度。 。 优选地, 所述光模块包括 I2C管理接口和串行数据接口, 所述测试模块通过所述 I2C管理接口接收所述触发消息; 所述测试模块通过所述串行数据接口向所述故障诊断模块发送封装后的 数据,所述串行数据接口为一个单端串行数据接口或一对差分串行数据接口。 本实施例的测试模块可以包括发送控制单元、发光单元和接收处理单元, 如图 3所示, 所述发送控制单元设置为:根据所述测试参数向发光单元下发控制指令; 所述发光单元设置为: 接收到所述控制指令后, 根据所述测试光信号的 类型和测试光信号的波形参数发送相应的测试光信号进行光时域反射测试; 接收处理单元设置为: 接收所述光时域反射测试所得的数据信息后, 将 所述数据信息和测试参数封装成光纤故障诊断所需的数据格式后, 发送给所 述故障诊断模块。 其中, 所述数据格式包括: 前导码字段、 帧头字段、 数据 字段和校验位字段, 其中, 所述前导码字段为用于标识光时域反射测试数据 的比特流信息, 所述帧头字段包括测试参数, 所述数据字段为测试所得的数 据信息,
所述测试参数信息至少包括: 测试光信号的类型信息、 测试光信号的波 形信息、 模数转换釆样率信息、 模数转换位宽信息和釆样开始时间信息。
进一步地, 所述故障诊断模块还设置为: 在检测所述前导码字段为用于 标识光时域反射测试数据, 并且成功校验所述校验位字段的数据后, 根据从 所述帧头字段中提取出的所述测试参数, 分析所述数据字段中的所述数据信 息。 进一步地, 所述光模块包括 I2C管理接口和串行数据接口, 所述测试模块通过所述 I2C管理接口接收所述触发消息; 所述测试模块通过所述串行数据接口向所述故障诊断模块发送封装后的 数据,所述串行数据接口为一个单端串行数据接口或一对差分串行数据接口。
进一步地, 所述控制模块还设置为: 将所述光纤故障诊断的结果信息上 才艮给上层网管。 这样可以实现将各个装置的上的光纤故障信号上 ^艮给上层网 管进行集中的分析处理。 图 4所示, 本实施例的方法可以包括下面步骤:
S10、 光线路终端的接收模块接收到诊断光纤故障消息后, 触发测试模 块;
S20、 所述测试模块被所述接收模块触发后, 进行光时域反射测试, 得 到测试的数据信息;
S30、 故障诊断模块分析所述数据信息, 进行光纤故障诊断。 这样, 本实施例的方法可以实现光线路终端自身进行光纤故障诊断, 满 足适时性和可维护性需求, 并且不需要其他设备或组件, 简化了系统的组网 结构。 进一步地, 在步骤 S20中的所述测试模块是根据预设的光时域反射测试 参数进行光时域反射测试的 . 所述光时域反射测试参数可以包括: 测试光信号的类型、 测试光信号的 波形参数、 釆样率、 模数转换位宽和釆样开始时间。 所述测试光信号的类型 为光脉冲, 所述测试光信号的波形参数为光脉冲的宽度; 或者, 所述测试光 信号的类型为伪随机序列,所述测试光信号的波形参数为伪随机序列的长度。 进一步地, 在步骤 S20中所述测试模块进行光时域反射测试得到数据信 息之后还可以包括: 所述测试模块将所述数据信息和测试参数封装成光纤故 障诊断所需的数据格式, 然后发送给所述故障诊断模块。 优选地, 所述接收模块通过 I2C管理接口触发所述测试模块; 所述测试模块通过一串行数据接口向所述故障诊断模块发送封装后的数 据, 所述串行数据接口为一个单端串行数据接口或一对差分串行数据接口。 进一步地, 所述测试模块将所述数据信息和测试参数封装成光纤故障诊 断所需的数据格式的步骤包括: 将所述测试参数封装为帧头字段, 将所述数据信息封装为数据字段, 在 所述帧头字段前加入用于标识光时域反射测试数据的前导码字段, 在所述数 据字段后加入校验位字段。 进一步地, 在步骤 S30中所述故障诊断模块分析所述数据信息的步骤包 括: 若检测所述前导码字段用于标识光时域反射测试数据, 并且对所述校验 位字段的数据校验成功, 则根据从所述帧头字段中提取出所述测试参数分析 所述数据字段中的所述数据信息。 进一步地, 所述故障诊断模块进行光纤故障诊断的步骤之后, 还包括: 将光纤故障诊断的结果信息上报给上层网管。 这样可以实现上层网管对光纤 故障信号进行集中的分析处理。
的方法。 本实施例的方法是将 OTDR技术和 PON OLT设备结合, 图 5为本实施 例的 OLT的示意图, 如图 5所示, OLT的光模块中包括一 OTDR测试模块, 可以在 OLT的光模块中完成 OTDR测试, 并将测试所得数据通过光模块专 用的 OTDR数据接口传送到 OLT的控制模块; OLT的控制模块完成测试数 据的分析和故障定位; 同时, OLT的控制模块通过光模块管理接口 (例如光 模块的 I2C管理接口 )可以实现 OTDR测试的控制和管理。 通过上述的测试 和诊断过程, 本实施例的方法可以在 PON OLT设备中完成系统的光纤故障 诊断过程; 本实施例的方法还可以利用 PON系统的上行管理通道将各 OLT 域内的故障情况上 给上层网管进行集中处理。
本实施例中的光模块需要在传统 PON OLT光模块基础上结合测试需求 进行改进, 如图 6所示。 在功能上, 本实施例在 OLT光模块中增加了 OTDR 功能组件(即 OTDR测试模块),用以完成 OTDR在线测试和数据转换过程; OTDR的测试光信号的波长可以选用 1625nm或 1650nm。 在电接口上, 本实 施例中的 OLT 的光模块可以增加一个单端数据接口或一对差分串行数据接 口, 用以完成 OTDR测试后的数据信号高速传输。 若 OLT上有多个光模块, 控制模块可以通过 I2C管理接口对多个光模块及各个光模块中的 OTDR测试 模块进行统一的管理。图 6中的 ROSA是光模块原有的业务接收模块, TOSA 是光模块中原有的业务发送模块,本发明在光模块中加入 OTDR测试模块不 会影响 ROSA和 TOSA的正常运行。 本实施例的 OTDR测试模块可以完成 OTDR测试的发送、接收和控制管 理过程, 如图 7所示。 OTDR测试模块可以包括发送控制单元、 发光单元和 接收处理单元。 发送控制单元, 可以完成 OTDR测试的光信号的发送控制功能, 可以根 据控制模块的指令选择测试光信号的类型和控制信号波形 , 控制发光单元发 出预定的测试光信号。 根据测试需求, OTDR测试模块的测试光信号类型可 以选择光脉冲或伪随机序列; 同时, 也可以控制发送光脉冲的宽度和伪随机 序列的长度。 发光单元可以是半导体激光器、 以及激光二极管等, 发光单元可以根据 发送控制单元的控制指令发出预定的测试光信号, 例如能够发出 1625nm或 1650nm波长的指定宽度光脉冲, 可以经光纤耦合器发送到光纤中。 接收处理单元, 用于接收 OTDR测试所得的光信号, 将该光信号处理后 发送给控制模块。 具体地, 从光纤耦合器发回的光信号经过光电检测器、 放大器和 A/D转 换器后进入接收处理单元。 接收处理单元可以完成数据信号緩存功能, 同时能够控制 A/D转换器的 启动、设置 A/D转换的釆样率,以及计算釆样起始时间和完成数据格式处理; 经接收处理单元的处理后, 测试所得数据经并串转换后通过光模块上定义的 OTDR数据接口传输到 OLT的控制模块。 所述光模块管理接口使用光模块已有的 I2C管理接口, 在保留 I2C接口 原有光模块管理功能的前提下,将 I2C接口与光模块内部增加的 OTDR功能 组件相连, 完成对 OTDR测试过程的控制和管理。 所述 OLT的控制模块, 在保留 OLT原有业务处理和系统管理功能的前 提下,增加 OTDR管理和数据分析功能,通过光模块管理接口可以发起 OTDR 测试过程, 并且可以设置 OTDR测试参数, 可以完成测试数据的分析和故障 定位过程。 当 OLT的控制模块发起测试时,在缺省条件下, OTDR测试模块使用固 定宽度的光脉冲和默认釆样率进行测试; 同时, OTDR测试模块的发送控制 单元提供可选的光脉冲或伪随机序列的测试模式; 在选定的测试模式下, 也 提供可选的光脉冲宽度或伪随机序列长度。 OTDR测试模块的接收处理模块 也提供可选的釆样率。 在发起 OTDR测试时, 控制模块可以根据测试需求的 不同对 OTDR测试模块的测试参数进行设定。 在 OLT的控制模块通过光模块管理接口发起 OTDR测试时, 系统同时 启动光模块的 OTDR测试模块中的 A/D转换器,以及接收处理单元中的计时 模块。 计时模块可以用于计算从发光单元开始发光到接收处理单元接收到第 一组测试所得数据信号的时间;测试所得信号经 A/D转换后,进行数据緩存; 然后, 用计时模块的时间减去系统传输和处理时延就能算出第一个釆样点的 釆样时间。 然后, 接收处理单元将必要的测试参数、 测试所得数据以及校验 位封装成系统约定的数据格式, 进行数据串行化处理; 最终, 通过光模块的 OTDR数据接口传送到 OLT的控制模块进行分析和故障定位。
图 8为本发明实施例约定的一种 OTDR测试数据的数据格式的示意图, 如图 8所示, 本实施例的系统约定的数据格式包括: 前导码字段、 帧头字段、 数据字段以及校验位字段。 前导码字段为系统约定的特定比特流信息; 帧头 字段主要包括测试参数, 所述测试参数应至少包含: 测试模式(即测试光信 号的类型信息) 、 测试光信号的波形信息 (包括光脉冲宽度或伪随机序列长 度) 、 釆样率、 A/D位宽及釆样开始时间等信息; 数据字段为测试数据流信 息,数据字段的有效长度根据 OTDR测试模块的最大釆样率和 A/D转换位宽 确定, 数据字段的总长度固定, 数据字段长度应至少可以包含最大釆样率下 的所有测试数据。 校验位字段在封装数据时通过约定的校验算法添加, 用以 完成接收端数据校验。 在本实施例中, 当 OLT的控制模块接收到光模块送来的测试数据时,根 据约定的前导码来检测 OTDR测试数据帧, 然后根据校验位进行数据校验, 例如根据预定的循环冗余校验码(Cyclic Redundancy Check, CRC )进行校 验, 若校验未通过, 说明传输发生错误, 则要求光模块内的 OTDR测试模块 重新传输; 否则, 从帧头信息中提取测试参数, 并根据釆样率、 A/D位宽以 及釆样开始时间等信息对数据字段的数据流进行分析处理, 完成数据分析和 故障定位。
使用本发明的方法对 PON系统进行测试时,流程如图 9所示,具体测试 过程如下:
5101、 在 PON系统运行过程中, PON网络系统的上层网管适时监控系 统运行状态, 当判断发生光纤故障时, 则触发相应的 OLT, 执行步骤 S102, 若判断发生其他故障, 则进行其他故障处理;
5102、 OLT发起 OTDR测试; 具体地, PON OLT的控制模块通过光模块管理接口发起 OTDR测试指 令, 适时开始 OTDR测试过程。
5103、 判断是否使用缺省配置, 若是, 则转向步骤 S105, 否则, 转向步 骤 S104;
5104、 根据当前测试环境设置测试参数; 具体地, PON OLT的控制模块通过光模块管理接口设置测试参数,测试 参数可以包括: 测试光信号类型、 光脉冲宽度或伪随机序列长度及光时域反 射仪测试釆样率等。
5105、 开始测试。
5106、 在测试过程中, 对测试所得信号进行处理; 具体地,光模块中的 OTDR测试模块的接收处理单元对测试所得信号进 行模数转换和处理, 并且完成数据格式封装; 通过光模块的 OTDR数据接口 将测试数据传送到 PON OLT的控制模块。
5107、 进行光纤故障分析; 具体地, PON OLT的控制模块接收到测试数据帧后, 提取 OTDR测试 参数和测试数据, 完成 OTDR测试数据的分析和光纤故障定位过程。
5108, 判断是否需交上层网管处理, 若是, 则转向步骤 S109, 否则, 转 向步骤 S110;
5109, 将光纤故障信息发送给上层网管, 则上层网管进行集中处理。 具体地, 根据系统管理和维护需求, 若网络部署需要上层网管维护和管 理系统故障信息, 则通过 PON OLT系统的上行管理通道, 将各 OLT域内的 故障情况上 给上层网管进行集中处理。
5110, PON OLT自行完成故障信息维护和管理, 测试完成。
本实施例将 OTDR测试技术应用到 PON OLT的系统设计当中, 在 OLT 光模块上增加 OTDR功能组件和数据接口;在 OLT的控制模块上增加 OTDR 管理和数据分析功能, 使得在发生光纤故障时, OLT的控制模块可以通过光 模块管理接口下达指令, 适时发起 OTDR故障诊断过程; 测试所得数据通过 光模块的 OTDR数据接口送回 OLT的控制模块, 完成数据分析和故障定位 过程。 根据系统需求, 使用本实施例 OLT 测试的光纤故障情况可以在 PON OLT上进行分析和处理, 实现 PON系统的光纤故障诊断; 也可以通过 PON 系统的上行管理通道,将各 OLT域内的故障情况上 ^艮给上层网管进行集中分 析处理, 最终实现 PON系统的光纤故障诊断。
以上仅为本发明的优选实施例, 当然, 本发明还可有其他多种实施例, 本发明同样适用于其他光网络系统上稍加改动, 在不背离本发明精神及其实 变形,但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性 本发明所提出的使用 OTDR技术进行 PON光纤诊断的方法和装置, 首 先,将光纤故障诊断过程结合 PON网络管理系统进行,满足适时性和可维护 性需求; 进一步地, 将 OTDR技术应用 PON OLT设计当中, 使 PON网络设 备自身具备了光纤故障诊断能力; 简化了系统的组网结构, 同时, 本发明的 方法无需引入除 OTDR组件以外的其它设备或组件,降低了网络的运营成本; 再次,本发明的方法使每个 OLT域内的光线故障诊断独立进行,提高了系统 的可靠性。

Claims

权 利 要 求 书
1、 一种在无源光网络中进行光纤故障诊断的方法, 该方法包括: 光线路终端的接收模块接收到诊断光纤故障消息后, 触发测试模块; 所述测试模块被所述接收模块触发后, 进行光时域反射测试, 得到测试 的数据信息; 以及 故障诊断模块分析所述数据信息, 进行光纤故障诊断。
2、 如权利要求 1所述的方法, 其中: 进行光时域反射测试的步骤中, 所 述测试模块是根据预设的光时域反射测试参数进行光时域反射测试的;其中, 所述光时域反射测试参数包括: 测试光信号的类型、测试光信号的波形参数、 釆样率、 模数转换位宽和釆样开始时间;
所述测试光信号的类型为光脉冲, 所述测试光信号的波形参数为光脉冲 的宽度; 或者, 所述测试光信号的类型为伪随机序列, 所述测试光信号的波 形参数为伪随机序列的长度。
3、如权利要求 2所述的方法,其中:所述测试模块进行光时域反射测试, 得到测试的数据信息的步骤之后, 所述方法还包括: 所述测试模块将所述数据信息和测试参数封装成光纤故障诊断所需的数 据格式, 然后发送给所述故障诊断模块。
4、 如权利要求 3所述的方法, 其中: 所述接收模块通过 I2C管理接口触发所述测试模块; 所述测试模块通过串行数据接口向所述故障诊断模块发送封装后的数 据, 所述串行数据接口为一个单端串行数据接口或一对差分串行数据接口。
5、如权利要求 3所述的方法, 其中: 所述测试模块将所述数据信息和测 试参数封装成光纤故障诊断所需的数据格式的步骤包括: 将所述测试参数封装为帧头字段, 将所述数据信息封装为数据字段, 在 所述帧头字段前加入用于标识光时域反射测试数据的前导码字段, 在所述数 据字段后加入校验位字段。
6、如权利要求 5所述的方法, 其中: 所述故障诊断模块分析所述数据信 息的步骤包括: 若检测所述前导码字段用于标识光时域反射测试数据, 并且对所述校验 位字段的数据校验成功, 则根据从所述帧头字段中提取出所述测试参数分析 所述数据字段中的所述数据信息。
7、 如权利要求 1-6中任一项所述的方法, 其中: 所述故障诊断模块进行 光纤故障诊断的步骤之后, 所述方法还包括: 将光纤故障诊断的结果信息上报给上层网管。
8、 一种光线路终端, 其包括控制模块和光模块; 其中, 所述控制模块设置为: 控制所述光模块收发业务; 所述控制模块包括接收模块和故障诊断模块,所述光模块包括测试模块; 所述接收模块设置为: 接收到诊断光纤故障消息时, 向所述测试模块发 送触发消息; 所述测试模块设置为: 接收到所述触发消息后, 进行光时域反射测试, 得到测试的数据信息; 所述故障诊断模块设置为: 分析所述数据信息, 进行光纤故障诊断。
9、 如权利要求 8所述的光线路终端, 其中, 所述测试模块是设置为按如下方式进行光时域反射测试: 根据预设的光 时域反射测试参数进行光时域反射测试, 所述光时域反射测试参数包括: 测 试光信号的类型、 测试光信号的波形参数、 釆样率、 模数转换位宽和釆样开 始时间, 所述测试光信号的类型为光脉冲, 所述测试光信号的波形参数为光脉冲 的宽度; 或者, 所述测试光信号的类型为伪随机序列, 所述测试光信号的波 形参数为伪随机序列的长度。
10、 如权利要求 9所述的光线路终端, 其中, 所述测试模块包括: 发送控制单元,其设置为:根据所述测试参数向发光单元下发控制指令; 发光单元, 其设置为: 接收到所述控制指令后, 根据所述测试光信号的 类型和测试光信号的波形参数发送相应的测试光信号进行光时域反射测试; 以及 接收处理单元,其设置为:接收所述光时域反射测试所得的数据信息后, 将所述数据信息和测试参数封装成光纤故障诊断所需的数据格式后, 发送给 所述故障诊断模块。
11、 如权利要求 10所述的光线路终端, 其中, 所述数据格式包括: 前导 码字段、 帧头字段、 数据字段和校验位字段, 其中, 所述前导码字段为用于 标识光时域反射测试数据的比特流信息, 所述帧头字段包括所述测试参数, 所述数据字段包括所述数据信息。
12、 如权利要求 11所述的光线路终端, 其中, 所述故障诊断模块是设置为按如下方式分析所述数据信息: 在检测所述 前导码字段为用于标识光时域反射测试数据, 并且成功校验所述校验位字段 的数据后, 根据从所述帧头字段中提取出的所述测试参数, 分析所述数据字 段中的所述数据信息。
13、 如权利要求 10 所述的光线路终端, 其中, 所述光模块还包括 I2C 管理接口和串行数据接口, 所述测试模块通过所述 I2C管理接口接收所述触发消息; 所述测试模块通过所述串行数据接口向所述故障诊断模块发送封装后的 数据,所述串行数据接口为一个单端串行数据接口或一对差分串行数据接口。
14、 如权利要求 8-13中任一项所述的光线路终端, 其中, 所述故障诊断模块还设置为: 将所述光纤故障诊断的结果信息上报给上 ^
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2842244A4 (en) * 2012-03-06 2015-12-02 Adtran Inc Optical communication devices having optical time domain reflectometers
EP2909599A4 (en) * 2012-10-18 2016-06-29 Ntest Inc LOSS ANALYSIS SYSTEM FOR A PASSIVE OPTICAL NETWORK
EP2757717A3 (en) * 2013-01-18 2017-07-26 Electronics and Telecommunications Research Institute Optical transceiver for performing data communication and optical link monitoring, and optical network system
CN115276816A (zh) * 2022-05-13 2022-11-01 西安电子科技大学 一种pwm信号自适应通信方法及装置

Families Citing this family (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2577890B1 (en) 2010-05-27 2019-02-20 EXFO Inc. Multiple-acquisition otdr method and device
CN101917226B (zh) * 2010-08-23 2016-03-02 中兴通讯股份有限公司 一种在无源光网络中进行光纤故障诊断的方法及光线路终端
CN102082609A (zh) * 2011-01-21 2011-06-01 中兴通讯股份有限公司 光线路终端、无源光网络系统及光信号的传输方法
CN102843195A (zh) * 2011-06-23 2012-12-26 深圳新飞通光电子技术有限公司 Olt光收发一体模块
US9344188B2 (en) * 2011-07-01 2016-05-17 Telefonaktiebolaget L M Ericsson (Publ) Device, remote node and methods for PON supervision
CN102299740A (zh) * 2011-08-22 2011-12-28 中兴通讯股份有限公司 一种光时域检测的方法和光线路终端
CN102412892B (zh) * 2011-09-02 2016-12-07 中兴通讯股份有限公司 一种单纤双向光模块及光程检测方法
CN102386971A (zh) * 2011-09-28 2012-03-21 中兴通讯股份有限公司 一种检测光纤故障的方法及装置
WO2013082771A1 (zh) * 2011-12-07 2013-06-13 华为技术有限公司 光纤链路检测方法、光线路终端和无源光网络系统
EP2782269A4 (en) * 2011-12-12 2014-12-17 Huawei Tech Co Ltd CIRCUIT FOR MODULATING AN OPTICAL TIME-RATE REFLECTOMETER TEST SIGNAL, AND SYSTEM AND DEVICE FOR A PASSIVE OPTICAL NETWORK
CN103326775B (zh) * 2012-03-22 2017-02-01 中兴通讯股份有限公司 光网络故障在线检测方法及装置
CN103326776B (zh) * 2012-03-23 2016-12-14 南京中兴软件有限责任公司 一种检测光网络故障的测量方法及装置
CN104205676B (zh) * 2012-07-02 2016-12-14 华为技术有限公司 光线路终端、光收发模块、系统以及光纤检测方法
WO2014094255A1 (zh) * 2012-12-19 2014-06-26 青岛海信宽带多媒体技术有限公司 光时域检测仪光模块及吉比特无源光网络断点检测系统
CN103973362A (zh) 2013-02-06 2014-08-06 中兴通讯股份有限公司 设置otdr测试参数集的方法及装置
CN103209028A (zh) * 2013-04-15 2013-07-17 浙江工业大学 可自动监测发光故障的智能化onu光收发模块
WO2015006623A1 (en) * 2013-07-10 2015-01-15 Neophotonics Corporation Optical network communication system with embedded optical time domain reflectometer and method of operation thereof
CN103957052A (zh) * 2014-05-12 2014-07-30 华为技术有限公司 光纤故障定位方法、光模块及光纤网络单元
WO2016033812A1 (zh) * 2014-09-05 2016-03-10 华为技术有限公司 一种光时域反射计及其对光纤进行检测的方法
CN105515645A (zh) * 2014-09-23 2016-04-20 中兴通讯股份有限公司 一种otdr诊断业务方法及其装置
US9341543B2 (en) 2014-10-16 2016-05-17 Texas Instruments Incorporated Method and OTDR apparatus for optical cable defect location with reduced memory requirement
CN107078793B (zh) * 2014-10-23 2018-12-07 华为技术有限公司 一种光纤故障诊断方法、装置及系统
CN104464449A (zh) * 2014-11-04 2015-03-25 北京物联世纪科技有限公司 一种光纤端接测试实训装置
US9641243B2 (en) 2015-02-23 2017-05-02 Exfo Inc. Safe-mode OTDR method
WO2016134545A1 (zh) * 2015-02-28 2016-09-01 华为技术有限公司 一种补偿光时域反射仪发端信号误差的方法和装置
CN106160848B (zh) * 2015-03-24 2020-06-26 中兴通讯股份有限公司 一种多信道系统的误码测试方法、装置和系统
CN105227229A (zh) * 2015-10-26 2016-01-06 毛茂军 一种光纤损坏检测定位系统
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WO2019086946A1 (en) * 2017-10-31 2019-05-09 Abb Schweiz Ag System and method for analyzing fault data of a power transmission network
CN111818403B (zh) * 2019-04-12 2021-10-19 华为技术有限公司 拓扑识别方法、装置及系统
CN113872685B (zh) * 2020-06-30 2023-04-11 华为技术有限公司 一种光线路终端olt设备和光路处理方法
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CN111953413B (zh) * 2020-08-14 2021-09-17 上海欣诺通信技术股份有限公司 一种光线路终端olt系统
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CN114553695B (zh) * 2022-01-27 2024-02-09 新华三技术有限公司合肥分公司 一种芯片配置方法及装置
CN116192245A (zh) * 2022-12-27 2023-05-30 湖北华网控股集团有限公司 基于pon网络的故障诊断方法、系统、设备及存储介质
CN117060998B (zh) * 2023-10-11 2024-02-02 国网山东省电力公司博兴县供电公司 电网通信光模块故障自动检测方法、装置、设备及介质
US20250247156A1 (en) * 2024-01-29 2025-07-31 Ciena Corporation Adjustable bandwidth current-to-voltage converter that operates in a dynamic load mode or in an integrate-and-dump mode for use in an optical receiver

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030041448A (ko) * 2001-11-20 2003-05-27 주식회사 케이티 감시광 루핑 방법을 이용한 피오엔 원격 광선로망 감시장치
KR20040023305A (ko) * 2002-09-11 2004-03-18 주식회사 케이티 Otdr을 이용한 wdm-pon 광선로 감시장치
US20060007426A1 (en) * 2004-07-08 2006-01-12 Weller Whitney T Novel Algorithm, Method and apparatus for In-Service Testing of Passive Optical Networks (PON) and Fiber to the Premise (FTTP) Networks
CN1731709A (zh) * 2004-08-05 2006-02-08 阿尔卡特公司 光配线网络监视方法和系统
CN1866790A (zh) * 2005-11-16 2006-11-22 华为技术有限公司 一种使用otdr检测光路的pon网络设计方法
US20070116467A1 (en) * 2005-11-23 2007-05-24 Samsung Electronics Co.; Ltd Passive optical network
CN101043272A (zh) * 2006-06-08 2007-09-26 华为技术有限公司 光纤线路故障的检测系统和方法
US20080031624A1 (en) * 2006-08-01 2008-02-07 Smith Joseph Lee Passive optical network optical time-domain reflectometry
CN101217313A (zh) * 2008-01-11 2008-07-09 北京邮电大学 一种使用otdr的无源光网络光纤故障诊断方法
CN101232328A (zh) * 2007-01-26 2008-07-30 华为技术有限公司 一种定位分支光纤的事件点的方法、光网络及网络设备
CN101291176A (zh) * 2007-04-18 2008-10-22 华为技术有限公司 一种光分布网络的故障检测方法、系统及装置
CN101304283A (zh) * 2008-07-04 2008-11-12 电子科技大学 利用无源光网络进行故障定位及安防探测的方法和装置
CN101360984A (zh) * 2006-02-03 2009-02-04 株式会社藤仓 光线路监视装置和光线路监视方法
CN101442691A (zh) * 2008-12-22 2009-05-27 武汉光迅科技股份有限公司 基于无源光网络系统的光缆监测系统
CN101505191A (zh) * 2009-04-01 2009-08-12 北京讯风光通信技术开发有限责任公司 一种以太网无源光网络的故障处理方法及系统
US20090263122A1 (en) * 2008-04-22 2009-10-22 Roger Jonathan Helkey Method and apparatus for network diagnostics in a passive optical network
CN201369727Y (zh) * 2008-11-17 2009-12-23 华为技术有限公司 一种光线路终端
CN101790111A (zh) * 2009-01-23 2010-07-28 华为技术有限公司 一种光分布网检测方法、装置及系统
CN101917226A (zh) * 2010-08-23 2010-12-15 中兴通讯股份有限公司 一种在无源光网络中进行光纤故障诊断的方法及光线路终端

Family Cites Families (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4812038A (en) * 1987-01-21 1989-03-14 Hewlett-Packard Company Adaptive selection of OTDR test parameters and the fusion of data taken from successively shrinking measurement spans
DE68907886T2 (de) * 1989-01-24 1994-01-13 Hewlett Packard Gmbh Verfahren und Vorrichtung zum Anwenden von optischen Zeitbereichsreflektometern.
KR0123893B1 (ko) * 1989-11-11 1997-12-01 마사씨 코지마 광전송로의 고장위치를 판별하는 방법 및 이 방법에 사용하는 광필터형 판별기
JP2804633B2 (ja) * 1991-02-12 1998-09-30 日本電信電話株式会社 光折り返し/媒体試験器
US5353110A (en) * 1991-07-12 1994-10-04 Tektronix, Inc. Method and apparatus for carrying out optical time domain reflectometry using weighing techniques
US5285305A (en) * 1991-12-12 1994-02-08 At & T Bell Laboratories Optical communication network with passive monitoring
US5453827A (en) * 1993-02-24 1995-09-26 Dicon Fiberoptics Fiberoptic in-line filter and technique for measuring the transmission quality of an optical fiber through the use of a fiberoptic in-line filter
US5758083A (en) * 1995-10-30 1998-05-26 Sun Microsystems, Inc. Method and system for sharing information between network managers
JP3224344B2 (ja) * 1996-06-10 2001-10-29 安藤電気株式会社 多分岐光線路試験装置
JPH10262000A (ja) * 1997-03-19 1998-09-29 Fujitsu Ltd パッシブオプチカルネットワークにおける障害復旧方法及び装置
US6359729B1 (en) * 1998-11-17 2002-03-19 Corvis Corporation Optical communication system and component control architectures and methods
JP3759845B2 (ja) * 1998-12-16 2006-03-29 富士通株式会社 光伝送路の監視のための方法及びシステム
US6396573B1 (en) * 2000-02-17 2002-05-28 Fitel U.S.A. Corp. System and method for optically testing broadcasting systems
US6396575B1 (en) * 2000-05-31 2002-05-28 Lucent Technologies Inc. Test and measurement system for detecting and monitoring faults and losses in passive optical networks (PONs)
US7088436B2 (en) * 2000-12-04 2006-08-08 Ross Alexander Saunders Integrated optical time domain reflectometer and optical supervisory network
US7242862B2 (en) * 2002-01-21 2007-07-10 Altera Corporation Network diagnostic tool for an optical transport network
US6943872B2 (en) * 2002-03-25 2005-09-13 Sumitomo Electric Industries, Ltd. Method for selection of optical fiber and system for inspection of optical fiber
JP3961973B2 (ja) * 2003-03-14 2007-08-22 富士通株式会社 Otdrによる測定方法及び端局装置
US7095493B2 (en) * 2003-11-24 2006-08-22 The Boeing Company Optical time domain reflectometer and method of using the same
US20050198272A1 (en) * 2004-02-23 2005-09-08 Bernard Marc R. System, method, and apparatus for connectivity testing
US7493040B1 (en) * 2004-07-15 2009-02-17 Nortel Networks Limited Method and apparatus for securing fiber in an optical network
US6989893B1 (en) * 2004-07-23 2006-01-24 At&T Corp. Application of statistical inference to optical time domain reflectometer data
KR100609703B1 (ko) * 2004-09-02 2006-08-09 한국전자통신연구원 가입자 단말 이상 동작 여부의 원격 진단 장치 및 그 방법
TWI255618B (en) * 2005-01-26 2006-05-21 Ind Tech Res Inst Apparatus and method of optical fiber condition monitoring in optical networks
KR100698766B1 (ko) * 2005-09-07 2007-03-23 한국과학기술원 파장분할 다중방식 수동형 광 가입자 망 시스템에 사용되는장애 위치 감시 장치 및 이를 구비한 파장분할 다중방식수동형 광 가입자 망 시스템
US20070154215A1 (en) * 2006-01-05 2007-07-05 Tellabs Bedford, Inc. Method and apparatus for detecting optical reflections in an optical network
GB0606680D0 (en) * 2006-04-03 2006-05-10 Univ Cardiff Method of and apparatus for detecting degradation of visual performance
US7957436B2 (en) * 2006-07-18 2011-06-07 Exfo Inc. Laser for providing pulsed light and reflectometric apparatus incorporating such a laser
US8107821B2 (en) * 2006-10-13 2012-01-31 Menara Networks, Inc. Systems and methods for Ethernet extension and demarcation
EP2034635B1 (en) * 2007-01-26 2012-08-15 Huawei Technologies Co., Ltd. A method for locating fiber event point and an optical network and network equipment thereof
US8050556B2 (en) * 2007-02-21 2011-11-01 Futurewei Technologies, Inc. In-band optical frequency division reflectometry
EP1986351B1 (en) * 2007-04-26 2010-02-24 Alcatel Lucent Optical network, monitoring unit and monitoring method
US7684702B2 (en) * 2007-05-21 2010-03-23 Inventec Multimedia & Telecom Corporation Optical link monitoring system and method for passive optical network
US20080317462A1 (en) * 2007-06-19 2008-12-25 Teng-Yuan Chi Optical fiber link monitoring method and apparatus for passive optical network
JP2009232077A (ja) * 2008-03-21 2009-10-08 Nec Corp 局側終端装置、通信システム、加入者装置管理方法、および局側終端装置のプログラム
KR100971676B1 (ko) * 2008-10-09 2010-07-22 한국과학기술원 수동형 광 가입자 망에서 장애 검출 방법 및 검출 장치, 및그 검출 장치를 구비한 수동형 광 가입자 망
WO2010043056A1 (en) * 2008-10-17 2010-04-22 Exfo Electro-Optical Engineering Inc. Method and apparatus for deriving parameters of optical paths in optical networks using a two-wavelength otdr and a wavelength-dependent reflective element
US8442398B2 (en) * 2008-10-21 2013-05-14 Broadcom Corporation Performance monitoring in passive optical networks
US8649679B2 (en) * 2008-12-15 2014-02-11 At&T Intellectual Property I, L.P. Management system for GPON based services
GB0823688D0 (en) * 2008-12-31 2009-02-04 Tyco Electronics Raychem Nv Unidirectional absolute optical attenuation measurement with OTDR
WO2010126427A1 (en) * 2009-04-30 2010-11-04 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for fault discovery in a passive optical network (pon)
US8406620B2 (en) * 2009-07-15 2013-03-26 Pmc Sierra Israel Ltd. Passive optical network (PON) in-band optical time domain reflectometer (OTDR)
IL206723A0 (en) * 2010-06-30 2010-12-30 Eci Telecom Ltd Technology for fault allocation in passive optical networks (pon)

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030041448A (ko) * 2001-11-20 2003-05-27 주식회사 케이티 감시광 루핑 방법을 이용한 피오엔 원격 광선로망 감시장치
KR20040023305A (ko) * 2002-09-11 2004-03-18 주식회사 케이티 Otdr을 이용한 wdm-pon 광선로 감시장치
US20060007426A1 (en) * 2004-07-08 2006-01-12 Weller Whitney T Novel Algorithm, Method and apparatus for In-Service Testing of Passive Optical Networks (PON) and Fiber to the Premise (FTTP) Networks
CN1731709A (zh) * 2004-08-05 2006-02-08 阿尔卡特公司 光配线网络监视方法和系统
CN1866790A (zh) * 2005-11-16 2006-11-22 华为技术有限公司 一种使用otdr检测光路的pon网络设计方法
US20070116467A1 (en) * 2005-11-23 2007-05-24 Samsung Electronics Co.; Ltd Passive optical network
CN101360984A (zh) * 2006-02-03 2009-02-04 株式会社藤仓 光线路监视装置和光线路监视方法
CN101043272A (zh) * 2006-06-08 2007-09-26 华为技术有限公司 光纤线路故障的检测系统和方法
US20080031624A1 (en) * 2006-08-01 2008-02-07 Smith Joseph Lee Passive optical network optical time-domain reflectometry
CN101232328A (zh) * 2007-01-26 2008-07-30 华为技术有限公司 一种定位分支光纤的事件点的方法、光网络及网络设备
CN101291176A (zh) * 2007-04-18 2008-10-22 华为技术有限公司 一种光分布网络的故障检测方法、系统及装置
CN101217313A (zh) * 2008-01-11 2008-07-09 北京邮电大学 一种使用otdr的无源光网络光纤故障诊断方法
US20090263122A1 (en) * 2008-04-22 2009-10-22 Roger Jonathan Helkey Method and apparatus for network diagnostics in a passive optical network
CN101304283A (zh) * 2008-07-04 2008-11-12 电子科技大学 利用无源光网络进行故障定位及安防探测的方法和装置
CN201369727Y (zh) * 2008-11-17 2009-12-23 华为技术有限公司 一种光线路终端
CN101442691A (zh) * 2008-12-22 2009-05-27 武汉光迅科技股份有限公司 基于无源光网络系统的光缆监测系统
CN101790111A (zh) * 2009-01-23 2010-07-28 华为技术有限公司 一种光分布网检测方法、装置及系统
CN101505191A (zh) * 2009-04-01 2009-08-12 北京讯风光通信技术开发有限责任公司 一种以太网无源光网络的故障处理方法及系统
CN101917226A (zh) * 2010-08-23 2010-12-15 中兴通讯股份有限公司 一种在无源光网络中进行光纤故障诊断的方法及光线路终端

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2842244A4 (en) * 2012-03-06 2015-12-02 Adtran Inc Optical communication devices having optical time domain reflectometers
EP2909599A4 (en) * 2012-10-18 2016-06-29 Ntest Inc LOSS ANALYSIS SYSTEM FOR A PASSIVE OPTICAL NETWORK
EP2757717A3 (en) * 2013-01-18 2017-07-26 Electronics and Telecommunications Research Institute Optical transceiver for performing data communication and optical link monitoring, and optical network system
CN115276816A (zh) * 2022-05-13 2022-11-01 西安电子科技大学 一种pwm信号自适应通信方法及装置

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US20130148958A1 (en) 2013-06-13

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