WO2011120372A1 - Système et procédé de détection d'une défaillance d'une fibre, commutateur optique et système de réseau optique passif - Google Patents

Système et procédé de détection d'une défaillance d'une fibre, commutateur optique et système de réseau optique passif Download PDF

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Publication number
WO2011120372A1
WO2011120372A1 PCT/CN2011/071672 CN2011071672W WO2011120372A1 WO 2011120372 A1 WO2011120372 A1 WO 2011120372A1 CN 2011071672 W CN2011071672 W CN 2011071672W WO 2011120372 A1 WO2011120372 A1 WO 2011120372A1
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Prior art keywords
optical
face
fiber
optical switch
apc
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PCT/CN2011/071672
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English (en)
Chinese (zh)
Inventor
温运生
赵峻
王世军
单小磊
王波
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华为技术有限公司
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Publication of WO2011120372A1 publication Critical patent/WO2011120372A1/fr

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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 present invention relates to optical network technologies, and in particular, to a fiber fault detection system, method, optical switch, and passive optical network system. Background technique
  • optical networks are becoming more and more popular in people's daily work and life.
  • the communication of the optical network is completed by a network composed of optical fibers, and the failure of the optical fiber during use causes the data to be transmitted. In this case, it is necessary to quickly locate the location where the optical fiber is faulty, so as to facilitate troubleshooting.
  • a passive optical network is a point-to-multipoint optical access network system that typically distributes optical signals to individual light by installing a 1:N splitter at the output of an Optical Line Terminal (OLT).
  • Optical Network Unit ONU:
  • OLT Optical Line Terminal
  • ONU Optical Network Unit
  • OLT optical multiplexer
  • OMU optical measurement unit
  • the OMU needs to communicate with the OMT through the ONU. Therefore, the ONU cannot communicate with the OMT through the ONU during the deployment and acceptance phase of the optical network, and the external power source is required to complete the mutual relationship between the optical signal and the electrical signal. change.
  • the prior art method of detecting fiber failure is not only costly, but usually only detects the entire light from the OLT to the ONU. Whether the fiber is faulty or not can not be responsible for the failure of the fiber. Summary of the invention
  • An object of the present invention is to provide a fiber fault detection system and method, an optical switch for optical fiber fault detection, and a passive optical network system, which are used to solve the problems in the prior art.
  • an embodiment of the present invention provides a fiber fault detection system, including a test device, an optical fiber to be tested, and an optical switch, wherein the optical fiber to be tested is connected between the test device and the optical switch;
  • the optical switch includes a first ferrule and a second ferrule, and the first ferrule includes a light transmitting surface respectively disposed at two ends thereof and a first inclined surface physically contacting the APC end surface, and the second ferrule includes a plurality of ferrules respectively disposed thereon a second APC end surface and a reflective surface at both ends, wherein when the first and second APC end faces are opposite, the optical switch is closed, and when the first and second APC end faces are separated, the optical switch Disconnecting;
  • the test device is configured to transmit a test signal to the optical fiber to be tested, and determine whether the optical fiber to be tested is present by detecting whether a reflected signal reflected by the test signal when the optical switch is closed is received. malfunction.
  • the embodiment of the present invention further provides an optical switch, including: a first ferrule and a second ferrule; one end of the first ferrule is a light transmitting surface, and the other end is a first inclined surface physically contacting the APC end surface; One end of the second ferrule is a second APC end face, and the other end is a reflective surface; the first APC end face and the second APC end face have the same radius of curvature and are oppositely disposed; when the first APC end face and the first When the two APC end faces are closed, the optical switch is closed, and when the first APC end face is separated from the second APC end face, the optical switch is turned off.
  • an optical switch including: a first ferrule and a second ferrule; one end of the first ferrule is a light transmitting surface, and the other end is a first inclined surface physically contacting the APC end surface; One end of the second ferrule is a second APC end face, and the other end is a reflective surface; the first
  • the embodiment of the present invention further provides a fiber fault detection method, including: transmitting a test signal to an optical switch through an optical fiber to be tested, wherein the optical switch includes a first ferrule and a second ferrule, and the first ferrule includes The light transmissive surface and the first inclined surface respectively disposed at the two ends thereof are physically contacted with the APC end surface, and the second ferrule includes a second APC end surface and a reflective surface respectively disposed at two ends thereof, wherein the transparent surface is connected to the waiting surface Detecting an optical fiber; detecting whether a reflected signal of the test signal is reflected and returned on a reflective surface of the second ferrule when the first APC end surface and the second APC end surface of the optical switch are mutually aligned, The optical switch is closed when the first APC end face and the second APC end face are opposite each other; and determining whether the optical fiber to be tested is faulty according to the detection result.
  • An embodiment of the present invention further provides a passive optical network system, including: an optical line terminal, an optical distribution network, and a plurality of optical network units, wherein the optical distribution network includes a beam splitter, and the optical splitter is connected to the optical fiber through a trunk optical fiber.
  • the optical line terminal is respectively connected to the plurality of optical network units through a plurality of branch fibers, the optical distribution network is provided with a plurality of optical switches, and the optical switches are respectively coupled to their corresponding branch fibers,
  • the optical switch includes a first ferrule and a second ferrule, and the first ferrule includes a transparent surface disposed at two ends thereof and a first inclined surface physically contacting the APC end surface, and the second ferrule includes two ferrules respectively disposed therein a second APC end surface and a reflecting surface of the end; wherein, when the first APC end surface and the second APC end surface are opposite, the optical switch is closed, when the first APC end surface and the second APC end surface are separated The optical switch is disconnected.
  • the solution provided by the embodiment of the invention provides an optical switch that can be used for detecting fiber faults on the fiber to be tested, and the optical switch can respectively reflect and absorb the test signal in the closed state and the off state, thereby, the central end test device Whether the fiber to be tested is faulty can be determined by transmitting a test signal and detecting whether a reflected signal is received. Since the state switching of the optical switch can be realized simply by controlling the abutment and separation of the APC end faces, it is not necessary to communicate with the test device through the user side device during the fiber failure detection, and on the other hand, due to the APC end face The coupling and separation can be achieved mechanically, without the need for an external power source for photoelectric conversion and at a lower cost.
  • the optical switch can be installed at different positions of the optical fiber to be detected to detect whether there is a fault in different positions of the optical fiber, determine the specific position of the optical fiber in the optical fiber, and improve the efficiency and accuracy of detecting the optical fiber fault.
  • FIG. 1 is a schematic structural view 1 of an optical switch according to an embodiment of the present invention
  • FIG. 2 is a schematic structural view 2 of an optical switch according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a first embodiment of an optical fiber fault detection system according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a second embodiment of an optical fiber fault detection system according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a fiber fault detection system applied to a PON system according to an embodiment of the present invention
  • FIG. 7 is a flowchart of a specific embodiment of a fiber fault detection method according to an embodiment of the present invention. Specific form
  • Embodiment 1 of an optical switch for performing fiber fault detection according to an embodiment of the present invention
  • FIG. 1 is a schematic structural diagram 1 of an optical switch for optical fiber fault detection according to an embodiment of the present invention.
  • an optical switch according to an embodiment of the present invention includes a first ferrule 10 and a second ferrule 20, wherein one end of the first ferrule 10 is a first slanted physical contact (APC) end face 101. The other end is a transmissive end face 103; one end of the second ferrule 20 is a second APC end face 102, and the other end is a physical contact (PC) end face 104 having a total reflection function, a first APC end face 101 and a second APC.
  • the end faces of the end faces 102 have the same radius of curvature and are disposed oppositely, and the first ferrule and the second ferrule may be made of a material such as an optical fiber or a ceramic.
  • the transmissive end face 103 can serve as a receiving/reflecting end face of the optical signal.
  • the test signal provided by the external test equipment can enter the first ferrule 10 through the transmissive end face 103, propagate inside the first ferrule 10 and reach the first APC end face 103.
  • the optical switch When the first APC end face 101 and the second APC end face 102 are separated, the optical switch is in an open state, at which time the first APC end face 101 fully absorbs the test signal transmitted from the transmissive end face 103.
  • the optical switch When the first APC end face 101 and the second APC end face 102 are aligned, the optical switch is closed.
  • the test signal will pass through the mating end faces of the first APC end face 101 and the second APC end face 102 to reach the PC end face 104.
  • the PC end face 104 further reflects the test signal, so that the test signal returns according to the original path and passes
  • the transmissive end face 103 is returned to the above external test device.
  • the second APC end face 102 and the first APC end face 101 can be joined or separated by driving the up and down movement of the second ferrule 20.
  • the optical switch provided by the embodiment of the present invention can be applied to a fiber optic network to implement fault detection of the fiber to be tested.
  • a technical solution of an embodiment of the present invention is introduced by using a Passive Optical Network (PON) as an example.
  • PON Passive Optical Network
  • the test device can be connected to the backbone fiber, and the optical switch is usually installed at the other end of the branch fiber opposite to the test device.
  • the branch fiber is faulty detected, the light on the branch fiber to be tested can be controlled.
  • the first APC end face 101 and the second APC end face 102 of the switch are coupled to each other.
  • the test device can send a test signal to the optical switch through the branch fiber to be tested to send a test signal, and if the branch fiber is normal, the test is performed.
  • the signal will pass through the mating end faces of the first APC end face 101 and the second APC end face 102 to reach the PC end face 103, and full-emission total reflection occurs on the PC end face 103, and the reflected signal will return to the test equipment along the original path of the optical fiber;
  • the test device cannot receive the reflected light. Therefore, the test device can determine whether the branch fiber to be tested is faulty by detecting whether the reflected light is received.
  • the first APC end face 101 in the optical switch on the non-measuring branch fiber can be controlled during fault detection. Separating from the second APC end face 102, the corresponding optical switch is turned off, so that the first APC end face 101 absorbs all the test signals transmitted to the local, so that only the optical switch on the optical fiber to be detected performs total reflection of the test signal. .
  • the optical switch used for the optical fiber fault detection in the embodiment of the present invention is installed at different positions of each fiber branch in the PON network, and can easily detect whether the optical fiber to be detected between the test device and the optical switch is faulty, because the optical fiber is cheap, and No external power supply is required, which reduces the cost of optical switches that are responsible for fiber fault location.
  • the first APC end face and the second end of the optical switch on the optical fiber to be detected are The APC end faces are aligned so that the test signal is totally reflected after reaching the PC end face, and the first APC end face of the optical switch on the non-detection fiber is separated from the second APC end face, so that the test signal reaches the first APC end face. All absorbed, so as to ensure that only the test signal of the optical switch on the fiber to be detected can reach the test device, and the optical switch is determined by detecting the different positions of the fiber by installing the optical switch at different positions of the fiber to be detected. The location, which improves the efficiency and accuracy of detecting faults.
  • Embodiment 2 of an optical switch for optical fiber fault detection according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram 2 of an optical switch used for optical fiber fault detection according to an embodiment of the present invention.
  • the optical switch according to the embodiment of the present invention further includes: a wavelength division multiplexer 105 and a driving device 106, wherein the wavelength division multiplexer 105 is configured to transmit the test signal sent by the testing device to the optical fiber to be tested. The communication signal is separated and the test signal is conducted to the transmissive end face of the optical switch.
  • the driving device 106 is for driving the engagement or separation of the first APC end face 101 and the second APC end face 102, and can be electrically driven and manually driven.
  • the embodiment of the present invention separates the test signal and the communication signal by the wavelength division multiplexer, so that the detection of the fiber failure does not affect the normal communication of the PON network, and the efficiency and mobility of detecting the fault are improved.
  • the optical switch in the embodiment of the present invention is completely It is made of fiber and has low cost.
  • FIG. 3 is a schematic structural diagram of Embodiment 1 of an optical fiber fault detection system according to an embodiment of the present invention.
  • the test fiber fault detection system of the embodiment of the present invention includes a test device 30, an optical fiber to be tested, and an optical switch 31, wherein the test device 30 is configured to transmit a test signal, and test according to whether or not the optical switch is totally reflected back. The signal is used to determine whether the fiber to be tested is faulty.
  • the optical switch 31 can adopt the optical switch described in the above embodiments.
  • the first ferrule 10 and the second ferrule 20 can include the first ferrule 10 and the second ferrule 20, wherein one end of the first ferrule 10 is The first APC end face 101 has a transmissive end face 103 at the other end, the second ferrule 20 has a second APC end face 102 at one end, and the other end is a PC end face 104 having a total reflection function, a first APC end face 101 and a second APC end face 102.
  • the end faces have equal radii of curvature and are oppositely arranged.
  • the test signal When the first APC end face 101 and the second APC end face 102 are aligned, the test signal will pass through the mating end faces of the first APC end face 101 and the second APC end face 102 to reach the PC end face, and the PC end face totally reflects the test signal.
  • the test signal will return to the original path and return to the test device 30 through the fiber to be tested; when the first APC end face 101 and the second APC end face 102 are separated, the first APC end face 101 will be transmitted from the transmissive end face 103.
  • the test signal is fully absorbed to prevent the test signal from being reflected back.
  • the test device transmits the test signal and receives the test signal of the total reflection to determine whether the fault is faulty, and the first APC end face 101 and the second APC end face of the optical switch on the fiber to be detected are required. 102 pairs, so that the test signal is totally reflected after reaching the end face of the PC, and the first APC end face 101 and the second APC end face 102 of the optical switch on the non-detection fiber are separated, so that the test signal reaches the first APC end face 101.
  • FIG. 4 is a schematic structural diagram of a second embodiment of an optical fiber fault detection system according to an embodiment of the present invention.
  • the optical switch in the optical fiber fault detection system of the embodiment of the present invention further includes: a first wavelength division multiplexer 105. a second wavelength division multiplexer io and a driving device 106, wherein the wavelength division multiplexer 105 and the second wavelength division multiplexer io are configured to transmit the test signal sent by the testing device 30 and the optical fiber to be tested under normal working conditions.
  • the communication signal is separated, and the test signal is conducted to the transmissive end face of the optical switch, and the test device 30 for totally reflecting back, the driving device 106 is used to drive the alignment of the first APC end face 101 and the second APC end face 102 or Separation, electronic control mode and manual mode can be used.
  • FIG. 5 is a flowchart of the second embodiment of the optical fiber fault detection system according to the embodiment of the present invention. As shown in Figure 5,
  • Step 501 The test signal transceiver device transmits a test signal.
  • FIG. 6 is a schematic structural diagram of a PON network in a system for testing a fiber fault location according to an embodiment of the present invention.
  • the PON network in the optical network according to the embodiment of the present invention includes an optical line terminal OLT, ATB/TB, and light.
  • a fiber distribution terminal FDT
  • an ONU a test device
  • an optical switch wherein the test device can be implemented by an Optical Time Domain Reflectometer (ODTR), and the OTDR is coupled to the optical fiber of the output end of the OLT through WDM, and the optical switch
  • the optical switch includes an optical switch 1, an optical switch 2, and an optical switch.
  • the optical switch can be installed on the optical fiber of each output port of the optical splitter, the optical fiber of the output port of the ATB/TB, and the optical fiber of the input end of the ONU. 3 and the optical switch 4, because the OTDR and the ONU cannot communicate or are interrupted, it is necessary to detect whether the optical fiber between the OTDR and the ONU is faulty and the location of the fault.
  • first test signals of different wavelengths are transmitted through the test equipment.
  • a test signal with a wavelength between 1625-1675 nm can be selected as the test signal, and the test signal and the communication signal propagate along the optical fiber, and then pass.
  • the optical splitter separates the two, wherein the test signal is conducted by the optical splitter to each optical switch, and the first APC end face and the second APC end face of each optical switch are separated, so the test signal will be the first in each optical switch.
  • An APC end face is fully absorbed and the communication signal continues along the fiber.
  • Step 502 Align the first APC end face and the second APC end face in the optical switch 1.
  • the first APC end face and the second APC end face of the optical switch at the other end of the fiber to be detected are aligned, and the first APC end face and the other optical switch are The two APC end faces are kept separated so that the test signal is completely absorbed at the first APC end face, avoiding the test signal conducted on other optical fibers being reflected or totally reflected by the optical switch on the optical fiber, reducing the test signal noise received by the test device. Opportunity to improve the accuracy of detecting fiber faults.
  • the first APC end surface and the second APC end surface of the optical switch 1 are aligned, and the first APC end surface and the second APC end surface of the other optical switches are kept separated, so that other non-to-be-detected
  • the first APC end face of the optical switch on the optical fiber can completely absorb the test signal, minimize the test signal reflected by the optical switch on the optical fiber that does not need to be detected, avoid the influence of the test signal noise on the detection result, and improve the test fiber. Accuracy, and the test signal smoothly reaches the end face of the PC in the optical switch 1.
  • the driving and disengaging and separating of the first APC end face and the second APC end face can be driven by the driving device
  • the dynamic mode includes electronically controlled driving and manual driving.
  • the driving device can be realized by an electrically controlled driving or a manually driven single pole double throw switch.
  • Step 503 The PC end face in the optical switch 1 totally reflects the test signal.
  • the test signal from the test device reaches the transmissive end face of the optical switch 1, and proceeds to pass through the first APC end face in the optical switch and the opposite end face of the second APC end face to reach the PC end face with total reflection function, and the PC end face will be tested.
  • the signal is totally reflected, and the fully reflected test signal will pass through the opposite end faces of the first APC end face and the second APC end face, and then return to the test device according to the original path of the fiber to be detected, and then enter step 504.
  • Step 504 If the test device receives the test signal that the PC end face of the optical switch 1 is totally reflected back, it indicates that the fiber to be detected in the segment has no fault, otherwise, the fiber to be detected is faulty.
  • test device does not receive the test signal that the optical end of the optical switch 1 is totally reflected back, it indicates that the optical fiber to be detected between the OTDR and the optical switch 1 is faulty, and the test signal cannot reach the PC end surface of the optical switch 1 or is totally reflected.
  • the test signal cannot be returned to the test device; if the test device receives the test signal that the optical end of the optical switch 1 is totally reflected back, it indicates that the fiber to be detected is not faulty.
  • the first APC end face and the second APC end face in the optical switch 1 are separated by the driving device, and then the first APC end face of the optical switch 2 is driven by the driving device. And the second APC end face is matched, so that only the optical switch 2 can totally reflect the received test signal. If the test device does not receive the test signal that is totally reflected back, it indicates that the optical fiber is faulty, since it has been detected.
  • the optical fiber between the OTDR and the optical switch 1 is not faulty, it indicates that the fault exists on the optical fiber between the optical switch 1 and the optical switch 2; if the test device receives the test signal that is totally reflected back, the optical switch 1 and the optical switch 2 are illustrated. There is no fault in the fiber between the two.
  • the optical switch 1 and the optical switch 2 When the optical fiber between the optical switch 1 and the optical switch 2 is not faulty, the first APC end face and the second APC end face in the optical switch 2 are separated, and then the first APC end face and the first in the optical switch 3 are driven by the driving device.
  • the two APC end faces are opposite, and the optical switch 3 is installed at the ONU of the user end.
  • the user can contact the user to manually connect the first APC end face and the second APC end face in the optical switch 3, or can be electronically controlled. .
  • test equipment does not receive the test signal that is totally reflected back, then The barrier exists on the optical fiber between the optical switch 2 and the optical switch 3; if the test device receives the test signal that is totally reflected back, it indicates that the optical fiber between the optical switch 2 and the optical switch 3 is not faulty.
  • the first APC end face and the second APC end face are combined in the optical switch at different positions on the optical fiber, so that the test signal reaches the PC end face with the total reflection function and is totally reflected to the total reflection test.
  • the signal returns to the test equipment along the original path of the fiber to be detected, while keeping the first APC end face and the second APC end face of the other optical switches on the optical network separated, so that the first APC end face of the optical switch reaching the other position is tested.
  • the signal is fully absorbed, and the optical switch is installed at different positions of the fiber to be detected to determine the location of the faulty fiber, including whether the fault is indoors or outdoors, and can effectively reduce the influence of test signal noise and improve the accuracy of fault detection. Sex and efficiency, reducing the interruption time of communication in optical networks.
  • FIG. 7 is a flowchart of a specific embodiment of an optical fiber fault detecting method according to an embodiment of the present invention. As shown in FIG. 7, the specific working process of the optical fiber fault detecting method in the embodiment of the present invention includes the following steps:
  • Step 701 The test device transmits a test signal.
  • the technical solution of the embodiment of the present invention is introduced by taking a PON network as shown in FIG. 6 as an example.
  • test signal and the communication signal propagate along the optical fiber, and then the two are separated by the optical splitter, wherein the test signal is transmitted by the optical splitter to each optical switch, and then the first APC end face of each optical switch and The second APC end faces are separated, so the test signal will be fully absorbed by the first APC end face in each optical switch, and the communication signal continues along the fiber.
  • Step 702 Align the first APC end surface and the second APC end surface in the optical switch.
  • the first APC end face and the second APC end face of the optical switch at the other end of the fiber to be detected are aligned, and the first APC end face and the other optical switch are The two APC end faces are kept in a separated state, so that the first APC end face of the optical switch on the other segment of the optical fiber can fully absorb the test signal, so that the first APC end face in the optical switch on the other non-to-be-detected optical fiber can be tested.
  • the signal is fully absorbed, and the test signal reaches the PC end face in the optical switch.
  • the PC end face in the optical switch 1 totally reflects the test signal.
  • Step 703 If the test device receives the test signal of the total reflection of the PC end face of the optical switch of the optical fiber to be detected, it indicates that the fiber to be detected is not faulty, otherwise, the fiber to be detected is faulty.
  • test device does not receive the test signal from the PC end of the optical switch, it indicates that the fiber to be detected between the OTDR and the optical switch is faulty.
  • the test signal cannot reach the PC end of the optical switch or the test signal of total reflection cannot be used.
  • the test equipment If the test equipment receives the test signal from the PC end of the optical switch, it indicates that there is no fault in the fiber to be detected.
  • the first APC end surface and the second APC end surface of one of the optical switch 1, the optical switch 2, the optical switch 3, and the optical switch 4 are respectively combined, and the other optical switches are The first APC end face and the second APC end face of an optical switch remain separated to detect the location of the fiber failure.
  • the first APC end face and the second APC end face of the optical switch at each position of the optical fiber are combined or separated, so that the total reflection test signal is returned to the test device along the original path of the optical fiber to be detected, so as to reach other
  • the test signal of the first APC end face of the position optical switch is fully absorbed to determine the location of the faulty fiber, reduce the influence of test signal noise, improve the accuracy and efficiency of fault detection, and reduce the interruption time of some optical fibers in the optical network.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

La présente invention concerne un système destiné à détecter une défaillance d'une fibre, comprenant un dispositif d'essai, une fibre à l'essai et un commutateur optique, la fibre à l'essai étant connectée entre le dispositif d'essai et le commutateur optique. Le commutateur optique comprend une première ferrule et une seconde ferrule ; la première ferrule comprend une surface de transmission de la lumière et une première surface de contact physique incliné (APC) qui se situent aux deux extrémités de la première ferrule, respectivement ; la seconde ferrule comprend une seconde surface APC et une surface de réflexion totale qui se situent aux deux extrémités de la seconde ferrule, respectivement. Lorsque la première et la seconde surface APC sont bout à bout, le commutateur optique est passant ; lorsque la première et la seconde surface APC sont séparées, le commutateur optique est coupé. Le dispositif d'essai est utilisé pour envoyer un signal d'essai dans la fibre à l'essai et il détecte la présence d'un signal réfléchi, qui revient parce que le signal est réfléchi sur la surface de réflexion de la seconde ferrule, lorsque le commutateur est passant, et il détermine, en fonction du résultat, si une défaillance s'est produite dans la fibre à l'essai. Les modes de réalisation de la présente invention concernent également un procédé de détection d'une défaillance d'une fibre, un commutateur optique et un système de réseau optique passif.
PCT/CN2011/071672 2010-03-30 2011-03-10 Système et procédé de détection d'une défaillance d'une fibre, commutateur optique et système de réseau optique passif WO2011120372A1 (fr)

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CN201010136977.8 2010-03-30
CN201010136977.8A CN102208941B (zh) 2010-03-30 2010-03-30 光纤故障检测系统、方法、光开关和无源光网络系统

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CN106301547A (zh) * 2016-08-24 2017-01-04 覃嘉雯 一种光纤监测系统
CN106452574B (zh) * 2016-10-20 2018-12-21 云南电网有限责任公司电力科学研究院 一种配电网epon系统的光接口特性测试平台及方法
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CN108809410B (zh) * 2018-05-03 2020-05-01 中国能源建设集团广东省电力设计研究院有限公司 光缆故障检测方法以及光缆故障检测系统
CN111030037B (zh) * 2019-11-21 2021-09-17 国网河南省电力公司商丘供电公司 光纤差动保护故障分析系统
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