WO2019056634A1 - Structure de réflectomètre optique dans le domaine temporel en ligne, système de détection et procédé de détection - Google Patents

Structure de réflectomètre optique dans le domaine temporel en ligne, système de détection et procédé de détection Download PDF

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WO2019056634A1
WO2019056634A1 PCT/CN2017/118232 CN2017118232W WO2019056634A1 WO 2019056634 A1 WO2019056634 A1 WO 2019056634A1 CN 2017118232 W CN2017118232 W CN 2017118232W WO 2019056634 A1 WO2019056634 A1 WO 2019056634A1
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optical
light
narrow linewidth
pulse
time domain
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PCT/CN2017/118232
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English (en)
Chinese (zh)
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叶知隽
熊涛
余春平
徐红春
余振宇
张建涛
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武汉光迅科技股份有限公司
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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
    • H04B10/07—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]

Definitions

  • the invention relates to the technical field of optical fiber detection, in particular to an online optical time domain reflectometer structure, a detection system and a detection method.
  • the Optical Time Domain Reflectometer is an important test instrument in optical fiber communication systems.
  • the optical transmission module of the OTDR transmits a set optical pulse signal according to the backward Fresnel reflection and Rayleigh.
  • the principle of scattering, the reflected light signal is converted by the light receiving module (including Avalanche Photodiode (APD)), and then processed and analyzed by the signal processing unit to obtain parameters such as the average loss of the measured fiber. It can measure the actual length and average loss of the fiber in the fiber-optic communication system, and can detect, locate and measure many types of events on the fiber link, such as the loss of fiber fusion, connectors, bending, etc. in the link. point.
  • APD Avalanche Photodiode
  • Dynamic range is a very important parameter of OTDR, which is usually used to classify the performance of OTDR.
  • the dynamic range is defined as the difference between the initial level and the noise level on the backscatter curve and is the maximum attenuation value (in dB) of the backscatter curve that can be tested.
  • the dynamic range indicates the maximum fiber loss information that can be measured, directly determining the longest fiber distance that can be measured.
  • the Erbium Doped Fiber Application Amplifier (EDFA) system used a 1510 nm light source to check the loss of the fiber link.
  • the EDFA integrates or configures the input and output terminals SIN and SOUT of the 1510 nm light source in the system.
  • the pass light wavelength range is 1500 to 1520 nm). With a 1510 nm light source, it is usually only possible to determine whether the entire fiber link is too worn or unreasonable by power variation, and it is impossible to know the type and location of the fault.
  • the OTDR is widely used in optical fiber communication systems because it can locate the cause and exact location of the fault point.
  • EXFO provided an OTDR algorithm and device for detecting one or more events in a fiber link in the patent "Multiple-acquisition OTDR Method and Device”. Through multiple optical acquisitions, test light pulses of different pulse widths or wavelengths are propagated in the optical link, and corresponding return optical signals from the fiber link are detected to determine the number and location of events.
  • optical fiber communication networks With the rapid development of optical fiber communication networks, how to efficiently and flexibly detect and maintain optical fiber networks is a huge challenge for operators.
  • the traditional external OTDR module is expensive and bulky, and needs to disconnect the optical fiber from the system before the detection to analyze the fault or breakpoint position.
  • the fiber link cannot be detected in real time, which affects the normal transmission of service light.
  • the application of the online OTDR module has just started in 2016, and system vendors generally attach importance to the testing and promotion of online products.
  • the entire market is in the early stages of growth.
  • On-the-spot OTDR can be used for on-site laying and post-maintenance of long-distance fiber-optic communication systems.
  • Online monitoring of fiber-optic communication networks can quickly and accurately determine the location of fiber fault points and ensure normal communication of the system.
  • On-line monitoring requires the OTDR to be installed in an optical communication system rack in the form of an optical module.
  • the application can realize real-time monitoring in the system, that is, it can be integrated into the existing system without interfering with or being disturbed by other components. After the evolution of the actual effects and application methods of the OTDR trial in 2016, the market gradually accepted OTDR as the optimal solution for fiber link monitoring.
  • the technical problem to be solved by the present invention is that in the system in real time, in the system monitoring application, there is an additional requirement for the performance of the OTDR, and the conventional technology may be seriously deteriorated here because the reverse of the link generation in the EDFA system.
  • the ASE enters the OTDR and affects the detection of the APD, resulting in a dynamic range of more than 10 dB, and the maximum fiber distance that the OTDR can detect is shortened.
  • the present invention provides an online optical time domain reflectometer structure comprising a narrow linewidth pulsed laser, a circulator, an optical filter, a photodetector and a processor, specifically:
  • the light exit of the narrow linewidth pulsed laser is connected to the first light inlet of the circulator, and the second inlet/outlet of the circulator is used for connecting the external fiber to be tested; wherein the center wavelength of the narrow linewidth pulse laser includes 1480 ⁇ 1520nm and 1610 ⁇ 1630nm, and the 20dB bandwidth of the narrow line width pulse is less than or equal to 6nm, the narrow line width pulse pulse width includes 5 ⁇ 20000ns;
  • a third light exit port of the circulator is connected to the optical filter, and the optical filter is connected in series between the third light exit port of the circulator and the photodetector;
  • the signal output port of the photodetector is coupled to the processor, and the processor is further coupled to a narrow linewidth pulsed laser to provide a drive signal for the narrow linewidth pulsed laser.
  • the optical filter is specifically a narrow linewidth filter having a 30 dB bandwidth of less than or equal to 6 nm.
  • the center wavelength of the narrow linewidth pulse laser is specifically 1502 nm, and the 20 dB bandwidth of the narrow line width pulse is less than or equal to 6 nm, and the pulse width is comprehensively set according to the length of the optical path to be detected and the event resolution; wherein the pulse width is The smaller the smaller, the stronger the ability to resolve adjacent events; the larger the pulse width, the longer the distance of the optical path that can be detected.
  • the center wavelength of the narrow linewidth pulsed laser is specifically 1625 nm, and the 20 dB bandwidth of the narrow linewidth pulse is less than or equal to 6 nm, and the pulse width is comprehensively set according to the length of the optical path to be detected and the event resolution; wherein the pulse width is The smaller the smaller, the stronger the ability to resolve adjacent events; the larger the pulse width, the longer the distance of the optical path that can be detected.
  • the present invention provides an online optical time domain reflection detecting system, comprising the optical time domain reflectometer, the transmitted optical signal, the wavelength division multiplexer, and the optical fiber network to be tested, according to the first aspect, wherein
  • the fiber network to be tested includes one or more network nodes, specifically:
  • the transmission optical signal is connected to a first input port of the wavelength division multiplexer, the second input/output port of the wavelength division multiplexer is connected to the optical fiber network to be tested, and the third input/output of the wavelength division multiplexer a port connected to the optical time domain reflectometer;
  • the optical fiber network to be tested is composed of one or more optical fiber links, and each of the optical fiber links is connected by a connector, and the connector is configured to form a partial reflection on a narrow linewidth pulse detection signal of the optical time domain reflectometer; Wherein, the narrow linewidth pulse detection signal transmits backscattering in the optical fiber, and the fiber end face or the fiber cross section forms a strong reflection on the narrow linewidth pulse detection signal.
  • the processor is further configured to record the intensity and time of receiving the portion of the backscattered light and the reflected light: determining the physical state of the point according to the light intensity, and calculating the distance of the point according to the time returned to the processor, In order to depict the fiber length and attenuation profile.
  • the present invention also provides an online optical time domain reflection detection system, including a narrow linewidth pulse laser, a circulator, a photodetector, a processor, a transmission optical signal, a wavelength division multiplexer, and an optical filter.
  • an online optical time domain reflection detection system including a narrow linewidth pulse laser, a circulator, a photodetector, a processor, a transmission optical signal, a wavelength division multiplexer, and an optical filter.
  • the optical fiber network to be tested includes one or more network nodes, specifically:
  • the transmission optical signal is connected to a first input port of the wavelength division multiplexer, the second input/output port of the wavelength division multiplexer is connected to the optical fiber network to be tested, and the third input/output of the wavelength division multiplexer a port connecting the second inlet/outlet of the circulator;
  • the light exit of the narrow linewidth pulsed laser is connected to the first light entrance of the circulator, and the third light exit of the circulator is connected between the light detectors; wherein the center wavelength of the narrow linewidth pulse laser comprises 1480-1520 nm And 1610 ⁇ 1630nm, and the 20dB bandwidth of the narrow line width pulse is less than or equal to 6nm, the narrow line width pulse pulse width includes 5 ⁇ 20000ns;
  • a signal output port of the photodetector is connected to the processor, and the processor is further connected to a narrow linewidth pulse laser to provide a driving signal for the narrow linewidth pulsed laser;
  • the optical fiber network to be tested is composed of one or more optical fiber links, and each of the optical fiber links is connected by a connector, and the connector is configured to form a partial reflection on a narrow linewidth pulse detection signal of the optical time domain reflectometer; Wherein, the narrow linewidth pulse detection signal transmits backscattering in the optical fiber, and the fiber end face or the fiber cross section forms a strong reflection on the narrow linewidth pulse detection signal.
  • the processor is further configured to record the intensity and time of receiving the portion of the backscattered light and the reflected light: determining a physical state of the point according to the light intensity, and calculating the point according to a time returned to the processor Distance to plot the fiber length and attenuation profile.
  • the present invention further provides an online optical time domain reflectometer using the online optical time domain reflectometer according to the first aspect, comprising:
  • a narrow linewidth pulsed laser emits narrow linewidth pulsed light driven by a processor
  • the narrow linewidth pulsed light passes through the first inlet port and the second inlet/outlet port of the circulator to enter the fiber to be tested;
  • the narrow linewidth pulsed light generates backscattered light and/or reflected light when encountering network nodes, breakpoints and/or deformation points during transmission in the optical fiber;
  • the signal converted by the photodetector is analyzed and processed by the processor.
  • the processor is further configured to record the intensity and time of receiving the portion of the backscattered light and the reflected light: determining a physical state of the point according to the light intensity, and calculating the point according to a time returned to the processor Distance to plot the fiber length and attenuation profile.
  • the invention selects a pulse laser with a specific wavelength to make the working wavelength of the OTDR different from the service optical signal, and the monitoring of the OTDR does not affect the normal operation of the optical network; further, by selecting a narrow linewidth pulse laser and an optical filter, only the pulse is used.
  • the narrow-band spectrum of the optical wavelength range can be captured by the photodetector, which improves the dynamic range and range of the OTDR itself, and filters out most of the reverse ASE in the EDFA system, improving the dynamic range during online monitoring.
  • FIG. 1 is a schematic structural diagram of an online optical time domain reflectometer according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a narrow linewidth pulse signal of a narrow linewidth pulse laser according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of performance parameters of a filter according to an embodiment of the present invention.
  • FIG. 4 is a backscattering curve diagram of a 1502 nm OTDR when an OTN is used to monitor an EDFA off pump according to an embodiment of the present invention
  • FIG. 5 is a backscattering curve diagram of a 1502 nm OTDR when an OTN online monitoring EDFA is turned on according to an embodiment of the present invention
  • FIG. 6 is a backscattering curve diagram of a 1625 nm OTDR when an OTN is used to monitor an EDFA off pump according to an embodiment of the present invention
  • FIG. 7 is a backscattering curve diagram of a 1625 nm OTDR when an OTN online monitoring EDFA is turned on according to an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of an online optical time domain reflection detecting system according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of another online optical time domain reflection detecting system according to an embodiment of the present invention.
  • FIG. 10 is a schematic flowchart of an online optical time domain reflection detecting method according to an embodiment of the present invention.
  • the symbol “/” means a meaning having two functions at the same time, for example, "second in/out port” indicates that the port can enter or exit light.
  • the symbol “A and / or B” indicates that the combination between the front and back objects connected by the symbol includes “A”, “B”, “A and B", such as “backscattered light and / or Reflected light indicates that it can express either “backscattered light”, “reflected light” alone, and “backscattered light and reflected light”.
  • Embodiment 1 of the present invention provides an online optical time domain reflectometer structure 1, as shown in FIG. 1, including a narrow linewidth pulse laser 101, a circulator 102, an optical filter 103, a photodetector 104, and a processor 105. ,specific:
  • the light exit of the narrow linewidth pulsed laser 101 is connected to the first light inlet of the circulator (the corresponding port labeled 1 in the circulator 102 in FIG. 1), and the second inlet/outlet of the circulator 102 (FIG. 1)
  • the corresponding port labeled 2 in the circulator 102 is used to connect the external fiber to be tested; wherein the center wavelength of the narrow linewidth pulse laser 101 includes 1480 to 1520 nm and 1610 to 1630 nm, and the narrow line width pulse is 20 dB.
  • the bandwidth is less than or equal to 6 nm
  • the narrow line width pulse width includes 5 to 20000 ns (as shown in FIG. 2, wherein the width of ⁇ is less than or equal to 6 nm);
  • the center wavelength of the narrow linewidth pulsed laser 101 in addition to taking into consideration the conventional data signal use band, for example, C30 band 1530nm-1565nm, L band 1565nm-1625nm, usually avoiding some Bands that are formulated for special purposes, such as 1490nm and 1510nm for the conventional Optical Supervising Channel (OSC), are usually excluded from the selection of the center wavelength of the narrow linewidth pulsed laser 101. other than.
  • OSC Optical Supervising Channel
  • the 1610-1630 nm selected in the embodiment of the present invention can be applied; if the cutoff wavelength of the L-band reaches 1625 nm, the OTDR of 1626-1630 nm can be selected, or the 1480-1520 nm can be directly used.
  • the OTDR goes to monitor the L-band.
  • the conventional optical monitoring channel can usually only determine whether the entire fiber link is excessively worn or unreasonable through power variation, and cannot know the type and location of the fault.
  • the monitoring wavelength written by the ITU standard is 1510 nm, and 1490 nm is an alternative.
  • the third light exit port of the circulator 102 (the corresponding port labeled 3 in the circulator 102 in FIG. 1) is connected to the optical filter 103, and the optical filter 103 is connected in series to the third of the circulator 102. Between the light exit port and the photodetector 104;
  • the signal output port of the photodetector 104 is connected to the processor 105.
  • the processor 105 is also connected to the narrow linewidth pulsed laser 101 to provide a driving signal for the narrow linewidth pulsed laser 101.
  • a pulse laser of a specific wavelength is selected such that the working wavelength of the OTDR is different from the service optical signal (also referred to as data signal light), and the monitoring of the OTDR does not affect the normal operation of the optical network; further, by selecting a narrow line Wide-pulse lasers and optical filters (for example, Wavelength Division Multiplexing (WDM)) are used together. Only the narrow-band spectrum of the pulsed light wavelength range can be collected by the photodetector, which improves the dynamics of the OTDR itself.
  • WDM Wavelength Division Multiplexing
  • Range dynamic range above 36dB and range (range up to 260km), and can filter out most of the reverse ASE in EDFA system (taking 20dBm output amplifier as an example, after 125km fiber, the ASE power generated at 1480 ⁇ 1520nm is -38.72dBm.
  • WDM wavelength division multiplexer
  • the optical filter 103 is specifically a narrow linewidth filter with a 30 dB bandwidth of less than or equal to 6 nm.
  • the length of ⁇ shown in the figure is less than or equal to 6 nm, and, in an optimal implementation, the center wavelength ⁇ of the filter window of the optical filter coincides with the center wavelength of the narrow linewidth pulse laser.
  • 6 nm is the most interval value obtained by testing in the embodiment of the present invention, and in the actual implementation process, considering the device fabrication difficulty and the processing cost, the value of the 30 dB bandwidth is increased by appropriately losing the filtering effect.
  • Selected implementations should also be attributed to equivalents under the common idea of the present invention. In the above narrow linewidth filter parameter setting conditions are small, the reverse ASE optical power entering the APD is reduced, and the detection performance of the APD is improved.
  • the center wavelengths of two typical narrow linewidth pulsed lasers 101 are also provided, and the corresponding experimental result data is given.
  • the center wavelength of the narrow linewidth pulsed laser 101 is specifically 1502 nm, and the 20 dB bandwidth of the narrow linewidth pulse is less than or equal to 6 nm, wherein the total length of the fiber reaches 125 km and the pulse width is set to 20000 ns.
  • the pulse width is comprehensively set according to the length of the optical path to be detected and the resolution of the event; wherein the smaller the pulse width, the stronger the ability to distinguish adjacent events; the larger the pulse width, the longer the distance of the optical path that can be detected.
  • the dynamic range of the 1502 nm OTDR is 37.58 dB, where the dynamic range is the range of the initial light attenuation intensity to the interval when the noise shown in FIG. 4 is generated; as shown in FIG.
  • the dynamic range of the 1502nm OTDR deteriorates to 34.98dB.
  • the OTDR instrument proposed by the embodiment of the present invention is only used when the OTN online monitoring is degraded by 2.60 dB (calculated by 37.58 dB-34.98 dB).
  • the center wavelength of the narrow linewidth pulsed laser 101 is specifically 1625 nm, and the 20 dB bandwidth of the narrow linewidth pulse is less than or equal to 6 nm, wherein the total length of the fiber reaches 125 km, and the pulse width is set to 20000 ns.
  • the pulse width is comprehensively set according to the length of the optical path to be detected and the resolution of the event; wherein the smaller the pulse width, the stronger the ability to distinguish adjacent events; the larger the pulse width, the longer the distance of the optical path that can be detected.
  • the dynamic range of the 1625nm OTDR is 36.00dB; as shown in Figure 7, when the EDFA is operating, the dynamic range of the 1625nm OTDR is degraded to 30.50dB.
  • the dynamic range is only degraded by 5.50 dB when applied to OTN online monitoring.
  • an on-line optical time domain reflectometry system is provided.
  • the embodiment of the present invention further provides an online optical time domain reflectance detecting system, which is used in the embodiment.
  • the optical time domain reflectometer 100 additionally includes a transmission optical signal 201, a wavelength division multiplexer 202, and an optical fiber network 203 to be tested, wherein the optical fiber network to be tested is composed of one or more optical fibers.
  • the link consists of each fiber link connected through a connector. There may be fusion points, bends, breaks or mechanical joints in the fiber. Specifically:
  • the transmission optical signal 201 is connected to a first input port of the wavelength division multiplexer 202, and the second input/output port of the wavelength division multiplexer 202 is connected to the optical fiber network 203 to be tested, and the wavelength division multiplexer 202 a third input/output port connected to the optical time domain reflectometer;
  • the optical fiber network to be tested is composed of one or more optical fiber links, and each of the optical fiber links is connected by a connector, and the connector is configured to form a partial reflection on a narrow linewidth pulse detection signal of the optical time domain reflectometer; Wherein, the narrow linewidth pulse detection signal transmits backscattering in the optical fiber, and the fiber end face or the fiber cross section forms a strong reflection on the narrow linewidth pulse detection signal.
  • the embodiment of the present invention also selects a pulse laser of a specific wavelength to make the operating wavelength of the OTDR different from the service optical signal, and the monitoring of the OTDR. It does not affect the normal operation of the optical network; further, by selecting a narrow linewidth pulsed laser and an optical filter, only the narrowband spectrum of the pulsed light wavelength range can be collected by the photodetector, which improves the dynamic range and range of the OTDR itself. It also filters out most of the reverse ASE in the EDFA system, improving the dynamic range of online monitoring.
  • the processor 105 is further configured to record the light intensity and time of receiving the portion of the backscattered light and the reflected light: determining the physical state of the point according to the light intensity, and calculating the time according to the time returned to the processor.
  • the distance of the points to plot the fiber length and attenuation profile can be referred to FIG. 4 to FIG. 7 , and details are not described herein again.
  • an on-line optical time domain reflectance detection system is also provided.
  • the embodiment of the present invention will The position of the optical filter in Embodiment 1 is adjusted, extracted from the OTDR 100, and disposed between the wavelength division multiplexer 202 and the OTDR 100, as shown in FIG. 9, including a narrow linewidth pulse laser 101, The circulator 102, the photodetector 104, the processor 105, the transmitted optical signal 201, the wavelength division multiplexer 202, the optical filter 103, and the optical fiber network 203 to be tested, wherein the optical fiber network to be tested includes one or more network nodes ,specific:
  • the transmission optical signal 201 is connected to a first input port of the wavelength division multiplexer 202, and the second input/output port of the wavelength division multiplexer 202 is connected to the optical fiber network 203 to be tested, and the wavelength division multiplexer 202 a third input/output port is connected to the second inlet/exit port of the circulator 102;
  • the 1550/ ⁇ wavelength division multiplexer 202 is used, which is characterized by transmitting light of 1528 to 1568 nm and reflecting light of wavelength ⁇ (center wavelength selected by the OTDR).
  • the first input port and the second input/output port of the wavelength division multiplexer 202 pass light from 1528 to 1568 nm, and the first input port and the third input/output port pass the light of the center wavelength ⁇ selected by the OTDR.
  • the light exit of the narrow linewidth pulsed laser 101 is connected to the first light entrance of the circulator 102, and the third light exit of the circulator 102 is connected between the photodetectors 104; wherein the center of the narrow linewidth pulsed laser 101
  • the wavelength includes 1480 to 1520 nm and 1610 to 1630 nm, and the 20 dB bandwidth of the narrow line width pulse is less than or equal to 6 nm, and the narrow line width pulse width includes 5 to 20000 ns;
  • the signal output port of the photodetector 104 is connected to the processor 105, and the processor 105 is further connected to the narrow linewidth pulse laser 101 to provide a driving signal for the narrow linewidth pulse laser 101;
  • the optical fiber network to be tested is composed of one or more optical fiber links, and each of the optical fiber links is connected by a connector, and the connector is configured to form a partial reflection on a narrow linewidth pulse detection signal of the optical time domain reflectometer; Wherein, the narrow linewidth pulse detection signal transmits backscattering in the optical fiber, and the fiber end face or the fiber cross section forms a strong reflection on the narrow linewidth pulse detection signal.
  • the embodiment of the present invention also selects a pulse laser of a specific wavelength, so that the operating wavelength of the OTDR is different from the service optical signal, and the OTDR is Monitoring does not affect the normal operation of the optical network; further, by selecting a narrow linewidth pulsed laser and an optical filter, only the narrowband spectrum of the pulsed light wavelength range can be collected by the photodetector, improving the dynamic range and range of the OTDR itself. And can filter out most of the reverse ASE in the EDFA system, improving the dynamic range of online monitoring.
  • the processor 105 is further configured to record the light intensity and time of receiving the partially backscattered light and the reflected light: determining the physical state of the point according to the light intensity, and calculating according to the time of the return processor The distance from this point is plotted to plot the fiber length and attenuation profile.
  • the embodiment of the present invention further provides an online optical time domain reflectometer using the online optical time domain reflectometer as described in Embodiment 1 in the method of the embodiment of the present invention, as shown in FIG.
  • the method also includes:
  • step 301 the narrow linewidth pulsed laser 101 emits narrow linewidth pulsed light under the drive of the processor 105.
  • the center wavelength of the pulsed laser is optional from 1480 to 1520 nm and 1610 to 1630 nm (excluding 1490 and 1510 nm monitored by OSC), and the 20 dB bandwidth is no more than 6 nm (as shown in Figure 1, the bandwidth ⁇ corresponding to 20 dB lower than the peak power is no more than 6 nm). ), pulse width 5 ⁇ 20000ns can be set.
  • step 302 the narrow linewidth pulsed light passes through the first inlet port and the second inlet/outlet port of the circulator 102 to enter the fiber to be tested.
  • the generated Rayleigh scattered light and Fresnel reflected light are transmitted through the optical fiber 203, and enter the detecting portion of the OTDR through the 2 interface 2 and the interface 3 of the circulator 102, wherein the detecting portion includes the narrowband WDM 103 and the APD 1045.
  • the narrow linewidth pulsed light produces backscattered light and/or reflected light when it encounters network nodes, breakpoints, and/or deformation points during transmission in the fiber.
  • step 304 the backscattered light and/or the reflected light corresponding to the narrow linewidth pulsed light, together with the reverse ASE light generated by the data signal, passes through the second inlet/exit port and the third inlet port of the circulator 102.
  • the transmission channel filters out the reverse ASE light outside the filtering bandwidth through the optical filter 103, and the backscattered light and/or the reflected light of the reverse ASE light and the narrow linewidth pulsed light within the remaining filtering bandwidth are received by the photodetector 104. collection.
  • Filtering with a 30 dB bandwidth of no more than 6 nm narrowband WDM 103 reduces the reverse ASE optical power entering the APD 104, improves the detection performance of the APD 104, and converts the signal through the APD 104.
  • the signal processor 105 performs analysis and processing.
  • step 305 the signal converted by photodetector 104 is analyzed and processed by processor 105.
  • the embodiment of the present invention also selects a pulse laser of a specific wavelength to make the operating wavelength of the OTDR different from the service optical signal, and the monitoring of the OTDR. It does not affect the normal operation of the optical network; further, by selecting a narrow linewidth pulsed laser and an optical filter, only the narrowband spectrum of the pulsed light wavelength range can be collected by the photodetector, which improves the dynamic range and range of the OTDR itself. It also filters out most of the reverse ASE in the EDFA system, improving the dynamic range of online monitoring.
  • the OTDR is installed in the optical communication system rack in the form of an optical module, and realizes the function of online monitoring of the OTN, and the dynamic range degradation is less than 6 dB (1502 nm OTDR can be less than 3 dB, and 1625 nm OTDR can be less than 6 dB).
  • the processor 105 is further configured to record the light intensity and time of receiving the partially backscattered light and the reflected light: determining the physical state of the point according to the light intensity, according to the time of returning to the processor The distance at this point is calculated to plot the fiber length and attenuation profile.

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Abstract

L'invention concerne une structure de réflectomètre optique dans le domaine temporel en ligne (OTDR), un système de détection et un procédé de détection. Dans la structure, une sortie de lumière d'un laser pulsé à largeur de raie étroite (101) est connectée à une première entrée de lumière (1) d'un circulateur (102) ; une deuxième entrée/sortie de lumière (2) du circulateur (102) est utilisée pour se connecter à une fibre optique externe à détecter ; une troisième sortie de lumière (3) du circulateur (102) est connectée à un filtre optique (103) ; le filtre optique (103) est connecté en série entre la troisième sortie de lumière (3) du circulateur (102) et un détecteur optique (104) ; un port de sortie de signal du détecteur optique (104) est connecté à un processeur (105) ; le processeur (105) est en outre connecté au laser pulsé à largeur de raie étroite (101) de façon à fournir un signal d'attaque pour le laser pulsé à largeur de raie étroite (101). Le laser pulsé à largeur de raie étroite (101) et le filtre optique (104) sont choisis pour être utilisés ensemble, de telle sorte que seuls des spectres à bande étroite dans une plage de longueurs d'onde de lumière pulsée peuvent être acquis par le détecteur optique (104) de telle sorte que la plage dynamique et la plage de mesure de l'OTDR lui-même sont améliorées, et par ailleurs la plupart de l'émission spontanée amplifiée (ASE) inverse dans un système d'amplificateur à fibre dopée à l'erbium (EDFA) peut être filtrée de telle sorte que la plage dynamique est améliorée pendant la surveillance en ligne.
PCT/CN2017/118232 2017-09-25 2017-12-25 Structure de réflectomètre optique dans le domaine temporel en ligne, système de détection et procédé de détection WO2019056634A1 (fr)

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CN201710874967.6 2017-09-25
CN201710874967.6A CN107483106B (zh) 2017-09-25 2017-09-25 一种在线的光时域反射仪结构、检测系统和检测方法

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