WO2021193807A1 - 特定システム、特定装置および特定方法 - Google Patents

特定システム、特定装置および特定方法 Download PDF

Info

Publication number
WO2021193807A1
WO2021193807A1 PCT/JP2021/012488 JP2021012488W WO2021193807A1 WO 2021193807 A1 WO2021193807 A1 WO 2021193807A1 JP 2021012488 W JP2021012488 W JP 2021012488W WO 2021193807 A1 WO2021193807 A1 WO 2021193807A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
specific
unit
hanging
fiber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/012488
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
幸英 依田
直人 小倉
義明 青野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to US17/802,260 priority Critical patent/US20230078369A1/en
Priority to JP2022510651A priority patent/JP7343043B2/ja
Publication of WO2021193807A1 publication Critical patent/WO2021193807A1/ja
Anticipated expiration legal-status Critical
Priority to JP2023112806A priority patent/JP7517555B2/ja
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/105—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means using electro-optical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
    • G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G01K11/324—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Raman scattering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/08—Testing mechanical properties
    • G01M11/088—Testing mechanical properties of optical fibres; Mechanical features associated with the optical testing of optical fibres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
    • G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • 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]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • G01N2021/4742—Details of optical heads therefor, e.g. using optical fibres comprising optical fibres
    • G01N2021/4745—Fused bundle, i.e. for backscatter

Definitions

  • the present invention relates to a specific system, a specific device, and a specific method for specifying the hanging of an optical fiber.
  • Patent Document 1 discloses a technique for monitoring the state of an optical fiber. In the technique described in Patent Document 1, it is determined that a failure such as breakage has occurred when the detected backscattered light is attenuated.
  • Patent Document 1 does not specify the sagging of the optical fiber.
  • the lead-in portion of the optical fiber drawn from the outside into the house may hang down due to the weight of snow, a typhoon, or the like. If this is left unattended, the hanging optical fiber may come into contact with a passerby or the like, leading to an accident. Therefore, it is very useful to provide a technique for identifying the sagging of an optical fiber.
  • One aspect of the present invention is to realize a specific system, a specific device, and a specific method for specifying the hanging of an optical fiber.
  • the specific system includes a transmitting means for transmitting pulsed light via an optical fiber and a receiving means for receiving backward scattered light of the pulsed light from the optical fiber.
  • a detection means for detecting the environmental state around the optical fiber from the rearward scattered light, and a specific means for identifying the drooping of the optical fiber from the detection result of the detection means.
  • the specific device includes an acquisition means for acquiring information indicating backward scattered light of the pulsed light received from the optical fiber to which the pulsed light is transmitted, and the above-mentioned. It includes a detecting means for detecting an environmental state around the optical fiber from information indicating backward scattered light, and a specific means for identifying the drooping of the optical fiber from the detection result of the detecting means.
  • the specific method according to one aspect of the present invention transmits pulsed light via an optical fiber, receives backward scattered light of the pulsed light from the optical fiber, and receives the backward scattered light of the pulsed light.
  • the environmental state around the optical fiber is detected from the above, and the sagging of the optical fiber is specified from the result of the detection.
  • the hanging of the optical fiber can be specified.
  • Embodiment 1 of the present invention will be described in detail.
  • the specific system according to the first embodiment identifies the hanging of the optical fiber.
  • the optical fiber is included in the optical line cable, and "hanging of the optical fiber" is synonymous with hanging of the optical line cable.
  • FIG. 1 is a diagram showing an example of each state of the optical fiber 10.
  • the upper part of FIG. 1 shows a state in which the optical fiber 10 is "opened".
  • the optical fiber 10 connected to the OLT (Optical Line Termination, station-side device) 110 arranged in the communication carrier station building 100 is overhead-wired via a predetermined route, and the house 200. It is drawn into the house 200 from a nearby utility pole 20 and connected to an ONU (Optical Network Unit, subscriber side device) 210 arranged in the house 200.
  • the OLT 110 is connected to the network of the communication carrier. By opening the optical fiber 10, the subscriber can connect a desired information processing terminal to the ONU 210 and perform communication via the optical fiber 10.
  • the middle part of FIG. 1 shows a state in which the optical fiber 10 is "remained".
  • the end portion of the optical fiber 10 drawn into the house 200 is housed in the house 200 without being connected to the ONU 210.
  • the optical fiber 10 in the house 200 is in a wound state. This occurs when the subscriber cancels the contract with the communication carrier after opening the optical fiber 10, removes the ONU 210, and leaves the end of the optical fiber 10 in the house 200.
  • the lower part of FIG. 1 shows a state in which "hanging" occurs in the remaining optical fiber 10.
  • the lead-in portion of the optical fiber 10 into the house hangs down from the utility pole 20 without being drawn into the house 200.
  • the fact that the optical fiber hangs down from the portion where the optical fiber is overhead-wired is called "hanging down".
  • the lead-in portion of the optical fiber drawn into the house from the outdoor overhead wiring may hang down due to the influence of the weight of snow, a typhoon, or the like. If this is left unattended, the hanging optical fiber may come into contact with a passerby or the like, leading to an accident.
  • the person who discovers the sagging of the optical fiber and the field survey based on the contact are aware of the occurrence of the sagging of the optical fiber and identify the location of the sagging.
  • this method has a high human cost, it is not possible to identify the drooping of the optical fiber at an early stage, and the risk of an accident is high.
  • the specific system according to the present embodiment can specify the hanging of the optical fiber, so that the maintenance of the optical fiber and the efficiency of the maintenance can be improved.
  • specifying the sagging of the optical fiber means specifying that the sagging of the optical fiber has occurred or that the sagging of the optical fiber has not occurred.
  • the sagging of the optical fiber is specified. It may be used to determine the presence or absence of hanging.
  • FIG. 2 is a diagram showing an example of a schematic configuration of the specific system 1 according to the first embodiment.
  • the specific system 1 is a specific system added to an optical communication system including an optical fiber 10 and an OLT 110, and includes a filter 120, a fiber sensing device 130, a server 300, and a monitoring terminal 400.
  • the OLT 110, the filter 120, and the fiber sensing device 130 are arranged in the communication carrier station building 100.
  • the optical fiber 10 connected to the OLT 110 is aerially wired via an arbitrary route, and will be described as hanging from the utility pole 20 in the vicinity of the house 200.
  • the fiber sensing device 130 includes a control unit 135, a transmission unit 131, a reception unit 132, and a communication unit 134.
  • the control unit 135 includes a detection unit 133.
  • the control unit 135 comprehensively controls each configuration of the fiber sensing device 130.
  • the control unit 135 may acquire the usage status of the optical fiber 10 from the OLT 110 and operate each configuration when the optical fiber 10 is a residual fiber.
  • the usage status of the optical fiber 10 is information indicating whether the optical fiber 10 is open or left behind.
  • the transmission unit 131 is a light source and outputs pulsed light.
  • the pulsed light output by the transmission unit 131 enters the optical fiber 10 via the filter 120.
  • the transmission unit 131 can transmit pulsed light via the optical fiber 10.
  • the receiving unit 132 is a photodetector.
  • the backscattered light of the pulsed light generated in the optical fiber 10 enters the receiving unit 132 through the filter 120.
  • the receiving unit 132 can receive the backscattered light of the pulsed light transmitted by the transmitting unit 131 from the optical fiber 10.
  • the receiving unit 132 converts the received backscattered light into an electric signal and outputs it to the detecting unit 133.
  • the wavelength ⁇ 1 of the pulsed light transmitted by the transmission unit 131 via the optical fiber 10 is preferably a wavelength sufficiently distant from the wavelength ⁇ 0 used by the OLT 110 for communication via the optical fiber 10.
  • the filter 120 is a wavelength division multiplexing (WDM) filter provided on the optical fiber 10 and transmits an optical signal having a wavelength in a predetermined range centered on the wavelength ⁇ 0 propagating in the optical fiber 10 as it is. ..
  • WDM wavelength division multiplexing
  • the filter 120 (i) directs the pulsed light output by the transmission unit 131 into the optical fiber 10 in the direction opposite to that of the OLT 110.
  • the backward scattered light of the pulsed light propagating the optical fiber 10 toward the OLT 110 side is input to the receiving unit 132.
  • a combination of various optical components may be used so as to realize the same function.
  • the detection unit (acquisition unit) 133 detects the environmental state around the optical fiber 10 from the signal indicating the backscattered light (information indicating the backscattered light) acquired from the receiving unit 132.
  • the environmental state detected by the detection unit 133 is vibration.
  • the detection unit 133 calculates the intensity of Rayleigh scattered light having the same wavelength ⁇ 1 as the pulsed light from the signal indicating the backscattered light. Since the intensity of Rayleigh scattered light changes according to the vibration of the optical fiber 10, the detection unit 133 can detect the vibration of the optical fiber 10.
  • the interval from the transmission unit 131 transmitting the pulsed light to the reception unit 132 receiving the backscattered light is an interval according to the position where the backscattered light is generated. Therefore, the detection unit 133 can calculate the generation position of the backscattered light from the time difference between the transmission timing of the pulsed light and the reception timing of the backscattered light corresponding to the pulsed light. As a result, the detection unit 133 can detect the vibration of the optical fiber 10 at a plurality of positions on the optical fiber 10.
  • the transmission unit 131 repeatedly transmits the pulsed light, so that the detection unit 133 can detect the vibration of the optical fiber 10 at a plurality of positions on the optical fiber 10 in chronological order.
  • the communication unit 134 communicates with the server 300 via the network.
  • the control unit 135 transmits information indicating the vibration of the optical fiber 10 detected by the detection unit 133 to the server 300 via the communication unit 134. Further, in one embodiment, the control unit 135 may also transmit the position information data of the optical fiber 10 to the server 300.
  • the position information data of the optical fiber 10 is, for example, information indicating a utility pole 20 in the vicinity of the house 200 in which the optical fiber 10 is left.
  • the server 300 includes a control unit 340 and a communication unit 310.
  • the control unit 340 includes a specific unit 320 and a database 330.
  • the control unit 340 comprehensively controls each configuration of the server 300.
  • the communication unit 310 communicates with the fiber sensing device 130 and the monitoring terminal 400 via the network.
  • the control unit 340 provides the specific unit 320 with information indicating vibration of the optical fiber 10 and position information data received from the fiber sensing device 130 via the communication unit 310.
  • the identification unit 320 identifies the sagging of the optical fiber 10 from the vibration of the optical fiber 10 with reference to the information stored in the database 330. Specific details will be described later. Further, when the specifying unit 320 identifies that the optical fiber 10 has a hanging position, the specific unit 320 may specify the position indicated by the position information data as the hanging position of the optical fiber 10.
  • control unit 340 transmits the identification result of the hanging position of the optical fiber 10 by the specific unit 320, and the identification result of the hanging position of the optical fiber 10 when the specific unit 320 specifies the hanging position of the optical fiber 10. It is transmitted to the monitoring terminal 400 via 310.
  • the monitoring terminal 400 includes a control unit 420, a communication unit 410, and an output unit 430.
  • the control unit 420 comprehensively controls each configuration of the monitoring terminal 400.
  • the communication unit 410 communicates with the server 300 via the network.
  • the output unit 430 includes a display device such as a display or an audio output device such as a speaker, and outputs various information.
  • the control unit 420 causes the output unit 430 to output the identification result of the hanging position of the optical fiber 10 and the identification result of the hanging position of the optical fiber 10 received from the server 300 via the communication unit 410.
  • FIG. 3 is a flowchart showing an example of the operation of the specific system 1.
  • the specific system 1 identifies the sagging of the optical fiber 10 based on the vibration of the optical fiber 10.
  • the transmission unit 131 of the fiber sensing device 130 transmits pulsed light via the optical fiber 10 (step S10). Since the hanging portion of the optical fiber 10 is not fixed, a large vibration is generated in the hanging portion due to wind or the like. Therefore, when pulsed light is transmitted via the optical fiber 10, backscattered light including Rayleigh scattered light corresponding to the vibration of the hanging portion is generated in the hanging portion of the optical fiber 10.
  • the backscattered light is received by the receiving unit 132 of the fiber sensing device 130 (step S11).
  • the receiving unit 132 converts the received backscattered light into an electric signal and outputs it to the detection unit 133 of the fiber sensing device 130.
  • the detection unit 133 detects the vibration of the optical fiber 10 from the signal indicating the backscattered light (information indicating the backscattered light) acquired from the receiving unit 132 (step S12).
  • the detection unit 133 calculates (i) the intensity of Rayleigh scattered light having the same wavelength ⁇ 1 as the pulsed light from the signal indicating the backward scattered light, and (i) the transmission timing of the pulsed light and the rear corresponding to the pulsed light.
  • the generation position of the backward scattered light is calculated from the time difference from the reception timing of the scattered light.
  • the detection unit 133 detects the vibration of the optical fiber 10 at a plurality of positions on the optical fiber 10 in chronological order.
  • the control unit 135 of the fiber sensing device 130 transmits information indicating the vibration of the optical fiber 10 detected by the detection unit 133 to the server 300 via the communication unit 134 of the fiber sensing device 130.
  • the control unit 340 of the server 300 provides the specific unit 320 of the server 300 with information indicating the vibration of the optical fiber 10 received from the fiber sensing device 130 via the communication unit 310 of the server 300.
  • the identification unit 320 identifies the sagging of the optical fiber 10 from the information indicating the vibration of the optical fiber 10 with reference to the data stored in the database 330 of the server 300 (step S13).
  • FIG. 6 is a diagram showing an example of a data structure of information indicating vibration of the optical fiber 10.
  • the rows in FIG. 6 show the values corresponding to each time point, and the columns show the values corresponding to each position.
  • the information indicating the vibration of the optical fiber 10 is information indicating the result of the detection unit 133 detecting the vibration of the optical fiber 10 at a plurality of positions on the optical fiber 10 in chronological order, and as shown in FIG.
  • a value indicating the vibration of the optical fiber 10 is included in time series for each of a plurality of positions on the optical fiber 10.
  • the value indicating the vibration of the optical fiber 10 may be, for example, a value corresponding to the intensity of Rayleigh scattered light or a value indicating the amplitude of the vibration.
  • the identification unit 320 identifies the sagging of the optical fiber 10 at a certain position from the temporal fluctuation of the vibration at a certain position on the optical fiber 10 with reference to the information indicating the vibration of the optical fiber 10.
  • the temporal fluctuation of vibration can be rephrased as data along a time series of values indicating vibration.
  • the identification unit 320 may use, for example, a position on the optical fiber 10 farthest from the OLT 110 or its vicinity, or may specify the hanging of the optical fiber 10 at each of a plurality of positions.
  • FIG. 4 is a diagram showing an example of temporal fluctuation of vibration at a certain position on the optical fiber 10.
  • the horizontal axis represents time and the vertical axis represents values corresponding to the intensity of Rayleigh scattered light.
  • the upper part of FIG. 4 shows an example of the case where the optical fiber 10 does not hang down at the certain position, and the lower part of FIG. 4 shows an example of the case where the optical fiber 10 hangs down at the certain position.
  • the amplitude of vibration at a certain position on the optical fiber 10 is larger when the optical fiber 10 is hanging at the certain position than when the optical fiber 10 is not hanging. This is because when the optical fiber 10 hangs down, it tends to vibrate greatly because the optical fiber 10 is not fixed. Therefore, for example, when the amplitude threshold is set in advance and the amplitude of vibration at a certain position on the optical fiber 10 exceeds the threshold, the specific unit 320 causes the optical fiber 10 to hang down at the certain position. It may be specified that it is.
  • the time from the maximum value of the vibration amplitude at a certain position on the optical fiber 10 to the halving time is longer when the optical fiber 10 hangs down at the certain position.
  • the optical fiber 10 is longer than when it is not hanging. This is because when the optical fiber 10 hangs down, the vibration damping tends to be slow because the optical fiber 10 is not fixed. Therefore, for example, a threshold value for the time until the vibration amplitude is halved from the maximum value is set in advance, and the time until the vibration amplitude at a certain position on the optical fiber 10 is halved from the maximum value exceeds the threshold value.
  • the specific unit 320 may specify that the optical fiber 10 is hung down at a certain position.
  • the specific unit 320 uses a learning model trained to detect a pattern of temporal fluctuation of vibration generated when the optical fiber 10 hangs down, including a pattern as shown in the lower part of FIG. , The hanging of the optical fiber 10 may be specified. Further, instead of making a rule-based determination, the specific unit 320 learns the relationship between the temporal fluctuation of the vibration of the optical fiber 10 at a certain position on the optical fiber 10 and the presence or absence of hanging of the optical fiber 10. The sagging of the optical fiber 10 may be specified by using the learning model.
  • Each of the above threshold values may be preset for the specific unit 320. Further, the specific unit 320 may set the threshold value by learning in advance the information indicating the vibration of the optical fiber 10 in the state where the optical fiber 10 does not hang down.
  • the specific unit 320 refers to the information indicating the vibration of the optical fiber 10 and determines that the optical fiber 10 hangs down from the spatial distribution of the vibration of the optical fiber 10 at a certain time point. Identify.
  • the spatial distribution of vibration can be rephrased as data indicating vibration at each of a plurality of positions on the optical fiber 10.
  • FIG. 5 is a diagram showing an example of the spatial distribution of the vibration of the optical fiber 10 at a certain time point.
  • the horizontal axis represents the position and the vertical axis represents the amplitude of vibration.
  • the position is indicated by the distance from the position farthest from the OLT 110 on the optical fiber 10.
  • the upper part of FIG. 5 shows an example of the case where the optical fiber 10 is not hanging at the certain time point, and the lower part of FIG. 5 shows an example of the case where the optical fiber 10 is hanging down at the certain time point.
  • the lower part of FIG. 5 shows an example in which the lead-in portion of the optical fiber 10 hangs down.
  • the pattern of the spatial distribution of vibration is different between the case where the optical fiber 10 does not hang down and the case where the lead-in portion of the optical fiber 10 hangs down.
  • the amplitude on the optical fiber 10 at the position farthest from the OLT 110 and in the vicinity thereof is very small when the optical fiber 10 does not hang down, whereas when the retracted portion of the optical fiber 10 hangs down, the amplitude is concerned.
  • the amplitude increases. This is because the position farthest from the OLT 110 on the optical fiber 10 and its vicinity does not cause vibration because it is housed in the house 200 when the lead-in portion of the optical fiber 10 does not hang down. This is because when the lead-in portion of the optical fiber 10 hangs down, it vibrates greatly.
  • the specific unit 320 uses a learning model trained to detect a pattern of spatial distribution of vibration generated when the optical fiber 10 hangs down, including a pattern as shown in the lower part of FIG. , The hanging of the optical fiber 10 may be specified. Further, instead of making a rule-based determination, the specific unit 320 learns the relationship between the spatial distribution of the vibration of the optical fiber 10 at a certain point in time and the presence or absence of hanging of the optical fiber 10. The sagging of the optical fiber 10 may be specified by using the learned learning model.
  • the specific unit 320 also detects the pattern of the spatial distribution of vibration in such a case as the pattern of the spatial distribution of vibration generated when the optical fiber 10 hangs down, and specifies the hanging of the optical fiber 10. You may.
  • the specific unit 320 uses a learning model in which the relationship between the vibration of the optical fiber 10 detected along the time series at a plurality of positions on the optical fiber 10 and the presence or absence of hanging of the optical fiber 10 is learned.
  • the hanging of the optical fiber 10 may be specified.
  • Each of the above-mentioned learning models can be stored in the database 330 in advance.
  • the control unit 340 specifies that the optical fiber 10 is hanging down via the communication unit 310. Is transmitted to the monitoring terminal 400.
  • the control unit 420 of the monitoring terminal 400 causes the output unit 430 to output an abnormality determination (hanging occurrence) based on the specific result received by the communication unit 410 of the monitoring terminal 400 (step S14).
  • the control unit 340 transmits the specific result to the monitoring terminal 400 via the communication unit 310, and the control unit 420 is specified.
  • the output unit 430 may output the hanging position of the optical fiber 10.
  • the control unit 340 monitors the specific result that the hang down does not occur via the communication unit 310. Send to 400.
  • the control unit 420 causes the output unit 430 to output a normal determination (no sagging) based on the specific result received by the communication unit 410 (step S15).
  • the specific system 1 can specify the hanging of the optical fiber 10 and output a specific result. As a result, maintenance of the optical fiber and efficiency of maintenance can be achieved.
  • the specific unit 320 refers to (i) the temporal variation of the vibration of the optical fiber 10 at a certain position on the optical fiber 10 and (ii) on the optical fiber 10 at a certain point in time.
  • the sagging of the optical fiber 10 can be identified from the information indicating at least one of the spatial distributions. Therefore, the detection unit 133 detects at least one of (i) a temporal fluctuation of the vibration of the optical fiber 10 at a certain position on the optical fiber 10 and (ii) a spatial distribution on the optical fiber 10 at a certain time point. Anything that does.
  • the fiber sensing device 130 is provided with the detection unit 133
  • the server 300 is provided with the specific unit 320 and the database 330.
  • the present embodiment is not limited to this, and various configurations may be adopted. can.
  • FIG. 7 is a diagram showing a schematic configuration of the specific system 2 according to a modified example.
  • FIG. 7 shows a configuration that realizes so-called cloud computing.
  • the control unit 135 of the fiber sensing device 130 does not include the detection unit 133, and instead, the control unit (specific device) 300 is controlled.
  • the unit 340 includes a detection unit 350 having the same function as the detection unit 133.
  • the control unit 135 of the fiber sensing device 130 transmits information indicating the backscattered light generated by the reception unit 132 to the server 300 via the communication unit 134.
  • the control unit (acquisition unit) 340 of the server 300 acquires the information indicating the backscattered light received via the communication unit 310 and provides it to the detection unit 350.
  • the specific system 2 can specify the hanging of the optical fiber 10 and output the specific result as in the specific system 1.
  • FIG. 8 is a diagram showing a schematic configuration of the specific system 3 according to another modified example.
  • FIG. 8 shows a configuration that realizes so-called edge computing.
  • the control unit 340 of the server 300 does not include the specific unit 320 and the database 330, and instead, the control unit 135 of the fiber sensing device (specific device) 130.
  • the specific unit 137 having the same function as the specific unit 320 and the database 136 having the same function as the database 330 are provided.
  • the identification unit 137 of the fiber sensing device 130 identifies the sagging of the optical fiber 10 from the information indicating the vibration of the optical fiber 10 calculated by the detection unit 133.
  • the control unit 135 transmits the specific result of the hanging of the optical fiber 10 to the server 300 via the communication unit 134.
  • the control unit 340 of the server 300 transmits the specific result of the hanging of the optical fiber 10 received via the communication unit 310 to the monitoring terminal 400 via the communication unit 310.
  • the specific system 3 can specify the hanging of the optical fiber 10 and output the specific result as in the specific system 1.
  • the fiber sensing device 130, the server 300, and the monitoring terminal 400 may be directly connected without going through a network, or any combination of the two, or all of them may be integrated.
  • the hanging portion of the lead-in portion of the optical fiber 10 which is the remaining fiber is specified, but the present embodiment is not limited to this, and even if the hanging portion of the open optical fiber 10 is specified. good.
  • the open optical fiber 10 can detect an abnormality from the communication status by the OLT 110, but may be further configured to specify the hanging of the optical fiber 10 by the specific system 1.
  • the optical fiber 10 may hang down not only in the drawn-in portion but also in the portion broken in the middle.
  • the breakage of the optical fiber 10 can be detected from the reflected light at the end face of the optical fiber 10, but the specific system 1 may further specify the sagging caused by the breakage of the optical fiber 10. Even if the optical fiber 10 hangs down due to breakage, the temporal fluctuation of the vibration of the optical fiber 10 has the pattern shown in FIG. 4, so that it can be specified by the specific system 1.
  • Embodiment 2 which is another embodiment of the present invention, will be described below.
  • the configuration in which the specific system detects the vibration of the optical fiber to specify the sagging of the optical fiber has been described, but what the specific system detects is not limited to the vibration of the optical fiber.
  • the specific system may detect the environmental state around the optical fiber and specify the hanging of the optical fiber.
  • Environmental conditions around the optical fiber include, for example, vibration, acoustics, pressure, temperature, etc.
  • the specific system is based on the intensity of Rayleigh scattered light contained in the backward scattered light of the pulsed light incident on the optical fiber. Vibration and sound may be detected, the pressure around the optical fiber may be detected from the frequency shift amount of the Brilluan scattered light contained in the rear scattered light, or the Raman scattered light contained in the rear scattered light may be detected.
  • the temperature around the optical fiber may be detected from the intensity.
  • the specific system may be any one that identifies the hanging of the optical fiber from the environmental state around these optical fibers.
  • FIG. 10 is a flowchart showing an example of the operation of the specific system according to the second embodiment.
  • the transmission unit 131 of the fiber sensing device 130 transmits pulsed light via the optical fiber 10 (step S20). Since the hanging portion of the optical fiber 10 is not housed in the house 200, the temperature changes due to the influence of the outdoor air temperature as compared with the case where the optical fiber 10 is housed in the house 200. Since the energy of the light propagating in the optical fiber 10 changes depending on the temperature in the optical fiber 10, backscattered light including Raman scattered light having an intensity corresponding to the temperature of the optical fiber 10 is generated.
  • the backscattered light is received by the receiving unit 132 of the fiber sensing device 130 (step S21).
  • the receiving unit 132 converts the received backscattered light into an electric signal and outputs it to the detection unit 133 of the fiber sensing device 130.
  • the detection unit 133 detects the temperature of the optical fiber 10 from the signal indicating the backscattered light (information indicating the backscattered light) acquired from the receiving unit 132 (step S22).
  • the detection unit 133 calculates (i) the intensity of Raman scattered light having a wavelength corresponding to the pulsed light wavelength ⁇ 1 from the signal indicating the backward scattered light, and (i) corresponds to the transmission timing of the pulsed light and the pulsed light.
  • the generation position of the backward scattered light is calculated from the time difference from the reception timing of the backward scattered light.
  • the detection unit 133 detects the temperature of the optical fiber 10 at a plurality of positions on the optical fiber 10 in chronological order.
  • the control unit 135 of the fiber sensing device 130 transmits information indicating the temperature of the optical fiber 10 detected by the detection unit 133 to the server 300 via the communication unit 134 of the fiber sensing device 130.
  • the control unit 340 of the server 300 provides the specific unit 320 of the server 300 with information indicating the temperature of the optical fiber 10 received from the fiber sensing device 130 via the communication unit 310 of the server 300.
  • the identification unit 320 identifies the sagging of the optical fiber 10 from the information indicating the temperature of the optical fiber 10 with reference to the data stored in the database 330 of the server 300 (step S23).
  • the data structure of the information indicating the temperature of the optical fiber 10 is the same as the structure shown in FIG. That is, the information indicating the temperature of the optical fiber 10 is the information indicating the result of the detection unit 133 detecting the temperature of the optical fiber 10 at a plurality of positions on the optical fiber 10 in chronological order, and is the temperature of the optical fiber 10.
  • the values indicating the above are included in time series for each of a plurality of positions on the optical fiber 10.
  • the identification unit 320 identifies the drooping of the optical fiber 10 at a certain position from the temporal fluctuation of the temperature at a certain position on the optical fiber 10 with reference to the information indicating the temperature of the optical fiber 10.
  • the temporal fluctuation of temperature can be rephrased as data along a time series of values indicating temperature.
  • FIG. 11 is a diagram showing an example of temporal fluctuation of temperature in the lead-in portion on the optical fiber 10.
  • the horizontal axis represents time and the vertical axis represents temperature.
  • the upper part of FIG. 4 shows an example of the case where the optical fiber 10 does not hang down at the pull-in portion, and the lower part of FIG. 4 shows an example of the case where the optical fiber 10 hangs down at the pull-in part.
  • FIG. 11 shows a case where the temperature of the drawn-in portion rises when the drawn-in portion of the optical fiber 10 hangs down as compared with the case where the optical fiber 10 does not hang down. Compared with the case where the fiber 10 does not hang down, the temperature of the drawn-in portion may decrease when the drawn-in portion of the optical fiber 10 hangs down.
  • the specific unit 320 uses a learning model trained to detect a pattern of temporal fluctuation of temperature that occurs when the optical fiber 10 hangs down, including a pattern as shown in the lower part of FIG. , The hanging of the optical fiber 10 may be specified. Further, instead of making a rule-based determination, the specific unit 320 learns the relationship between the temporal fluctuation of the temperature of the optical fiber 10 at a certain position on the optical fiber 10 and the presence or absence of hanging of the optical fiber 10. The sagging of the optical fiber 10 may be specified by using the learned learning model.
  • the specific unit 320 refers to the information indicating the temperature of the optical fiber 10 and determines that the optical fiber 10 hangs down from the spatial distribution of the temperature of the optical fiber 10 at a certain time point. Identify.
  • the spatial distribution of temperature can be rephrased as data indicating the temperature at each of a plurality of positions on the optical fiber 10.
  • FIG. 12 is a diagram showing an example of the spatial distribution of the temperature of the optical fiber 10 at a certain time point.
  • the horizontal axis represents the position and the vertical axis represents the temperature.
  • the position is indicated by the distance from the position farthest from the OLT 110 on the optical fiber 10.
  • the upper part of FIG. 12 shows an example of the case where the optical fiber 10 is not hanging at the certain time point
  • the lower part of FIG. 12 shows an example of the case where the optical fiber 10 is hanging down at the certain time point.
  • the lower part of FIG. 12 shows an example in which the lead-in portion of the optical fiber 10 hangs down.
  • the pattern of the spatial distribution of temperature is different between the case where the optical fiber 10 does not hang down and the case where the lead-in portion of the optical fiber 10 hangs down.
  • the temperature at the position farthest from the OLT 110 on the optical fiber 10 and the temperature in the vicinity thereof are different from the temperature in other parts, whereas the temperature of the optical fiber 10 is retracted. If the part hangs down, it is the same as the temperature in the other parts. This is because the position farthest from the OLT 110 on the optical fiber 10 and its vicinity is housed in the house 200 when the lead-in portion of the optical fiber 10 does not hang down, so that the temperature is different from that of the outdoor optical fiber 10. However, when the lead-in portion of the optical fiber 10 hangs down, the temperature becomes the same as that of the outdoor optical fiber 10.
  • the specific unit 320 uses a learning model trained to detect a pattern of the spatial distribution of temperature that occurs when the optical fiber 10 hangs down, including a pattern as shown in the lower part of FIG. , The hanging of the optical fiber 10 may be specified. Further, instead of making a rule-based determination, the specific unit 320 learns the relationship between the spatial distribution of the temperature of the optical fiber 10 at a certain point in time and the presence or absence of sagging of the optical fiber 10. The sagging of the optical fiber 10 may be specified by using the learned learning model.
  • the specific unit 320 uses a learning model in which the relationship between the temperature of the optical fiber 10 detected along the time series at a plurality of positions on the optical fiber 10 and the presence or absence of hanging of the optical fiber 10 is learned.
  • the hanging of the optical fiber 10 may be specified.
  • Each of the above-mentioned learning models can be stored in the database 330 in advance.
  • the control unit 340 specifies that the optical fiber 10 is hanging down via the communication unit 310. Is transmitted to the monitoring terminal 400.
  • the control unit 420 of the monitoring terminal 400 causes the output unit 430 to output an abnormality determination (hanging occurrence) based on the specific result received by the communication unit 410 of the monitoring terminal 400 (step S24).
  • the specific unit 320 may specify the hanging position of the optical fiber 10, and in that case, the control unit 340 transmits the specific result to the monitoring terminal 400 via the communication unit 310.
  • the control unit 420 may output the specified hanging position of the optical fiber 10 to the output unit 430.
  • the control unit 340 monitors the specific result that the hang down does not occur via the communication unit 310. Send to 400.
  • the control unit 420 causes the output unit 430 to output a normal determination (no sagging) based on the specific result received by the communication unit 410 (step S25).
  • the specific system according to the second embodiment can also specify the hanging of the optical fiber 10 and output the specific result.
  • FIG. 13 is a diagram showing an example of a schematic configuration of the specific system 4 according to the third embodiment.
  • the optical fiber 10 connected to the OLT 110 is overhead-wired via an arbitrary path, and is branched into a plurality of branched fibers 10a and 10b by an optical splitter 30.
  • the branch fiber 10a is open, is drawn into the house 200a from the utility pole 20a near the house 200a, and is connected to the ONU201a in the house 200a.
  • the branch fiber 10b is a residual fiber and hangs down from a utility pole 20b near the house 200b.
  • FIG. 14 is a flowchart showing an example of the operation of the specific system 4 according to the third embodiment.
  • the transmission unit 131 of the fiber sensing device 130 transmits pulsed light via the optical fiber 10 (step S30).
  • the backscattered light of the pulsed light generated in the optical fiber 10 is received by the receiving unit 132 of the fiber sensing device 130 (step S31).
  • the receiving unit 132 converts the received backscattered light into an electric signal and outputs it to the detection unit 133 of the fiber sensing device 130.
  • the detection unit 133 detects the environmental state around the optical fiber 10 from the signal indicating the backscattered light (information indicating the backscattered light) acquired from the receiving unit 132 (step S32).
  • the detection unit 133 also calculates the generation position of the backscattered light from the time difference between the transmission timing of the pulsed light and the reception timing of the backscattered light corresponding to the pulsed light. As a result, the detection unit 133 detects the environmental state around the optical fiber 10 at a plurality of positions on the optical fiber 10 in chronological order.
  • the control unit 135 of the fiber sensing device 130 transmits information indicating the environmental state around the optical fiber 10 detected by the detection unit 133 to the server 300 via the communication unit 134 of the fiber sensing device 130.
  • the control unit 135 also acquires the usage status of each of the branch fibers 10a and 10b from the OLT 110 and transmits the usage status to the server 300 via the communication unit 134.
  • the usage status of the branched fibers 10a and 10b includes information indicating whether each of the branched fibers 10a and 10b is open or left behind, and whether or not there is a communication failure in the open branched fibers. Contains information indicating whether or not.
  • the control unit 340 of the server 300 provides the specific unit 320 of the server 300 with information indicating the environmental state around the optical fiber 10 received from the fiber sensing device 130 via the communication unit 310 of the server 300. Similar to the first or second embodiment, the identification unit 320 refers to the data stored in the database 330 of the server 300 and identifies the hanging of the optical fiber 10 from the information indicating the environmental state around the optical fiber 10. (Step S33).
  • the specific unit 320 determines that the optical fiber 10 is sagging (YES in step S33), the specific unit 320 identifies a candidate for the branch fiber in which the optical fiber 10 is sagging (step S34).
  • the specific unit 320 refers to the usage status of the branched fibers 10a and 10b received from the fiber sensing device 130 via the communication unit 310, and if there is a communication failure in the open branched fiber, the said one.
  • the branched fiber is identified as a candidate for the branched fiber in which the sag has occurred.
  • the specific unit 320 also excludes the open branch fiber from the candidates when there is no communication failure in the open branch fiber, and removes the remaining branch fiber from the branch fiber in which the hanging fiber has occurred. Identify as a candidate.
  • the control unit 340 transmits to the monitoring terminal 400 the specific result indicating that the hanging has occurred and the specific result of the candidate of the branch fiber in which the hanging has occurred, via the communication unit 310.
  • the control unit 420 of the monitoring terminal 400 causes the output unit 430 to determine an abnormality (occurrence of sagging) and output a candidate for the branch fiber in which the sagging has occurred, based on each specific result received by the communication unit 410 of the monitoring terminal 400. (Step S35).
  • the specific unit 320 may specify the hanging position of the optical fiber 10, and in that case, the control unit 340 transmits the specific result to the monitoring terminal 400 via the communication unit 310. Upon transmission, the control unit 420 may output the specified hanging position of the optical fiber 10 to the output unit 430.
  • the control unit 340 monitors the specific result that the hang down does not occur via the communication unit 310. Send to 400.
  • the control unit 420 causes the output unit 430 to output a normal determination (no sagging) based on the specific result received by the communication unit 410 (step S36).
  • the specific system 4 according to the third embodiment can also specify the hanging of the optical fiber 10 and output the specific result. Further, according to the specific system 4, even when the optical fiber 10 is branched, the candidate of the branched fiber in which the optical fiber 10 hangs down can be specified.
  • FIG. 15 is a block diagram showing the configuration of the specific system 5 according to the present embodiment.
  • the specific system 5 includes a transmission unit 131, a reception unit 132, a detection unit 133, and a specific unit 320.
  • the transmission unit 131 transmits pulsed light via the optical fiber 10.
  • the receiving unit 132 receives the backscattered light of the pulsed light from the optical fiber 10.
  • the detection unit 133 detects the environmental state around the optical fiber 10 from the backscattered light.
  • the identification unit 320 identifies the hanging of the optical fiber 10 from the detection result of the detection unit 133.
  • the specific system 5 detects the environmental state around the optical fiber 10 from the backscattered light corresponding to the pulsed light incident on the optical fiber 10, and identifies the drooping of the optical fiber 10 from the detection result. can do.
  • FIG. 16 is a block diagram showing the configuration of the specific device 500 according to the present embodiment.
  • the specific device 500 includes a transmission unit 131, a reception unit 132, a detection unit 133, and a specific unit 137.
  • the transmission unit 131 transmits pulsed light via the optical fiber 10.
  • the receiving unit 132 receives the backscattered light of the pulsed light from the optical fiber 10.
  • the detection unit 133 detects the environmental state around the optical fiber 10 from the backscattered light.
  • the identification unit 137 identifies the hanging of the optical fiber 10 from the detection result of the detection unit 133.
  • the identification device 500 detects the environmental state around the optical fiber 10 from the backscattered light corresponding to the pulsed light incident on the optical fiber 10, and identifies the drooping of the optical fiber 10 from the detection result. can do.
  • control blocks (particularly, each part included in the control units 135, 340 and 420) of the fiber sensing device 130, the server 300 and the monitoring terminal 400 are realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like. It may be realized by software.
  • the fiber sensing device 130, the server 300, and the monitoring terminal 400 include a computer that executes a program instruction that is software that realizes each function.
  • the computer includes, for example, one or more processors and a computer-readable recording medium that stores the program. Then, in the computer, the processor reads the program from the recording medium and executes it, thereby achieving the object of the present invention.
  • the processor for example, a CPU (Central Processing Unit) can be used.
  • the recording medium in addition to a “non-temporary tangible medium” such as a ROM (Read Only Memory), a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
  • a RAM RandomAccessMemory
  • the program may be supplied to the computer via an arbitrary transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program.
  • a transmission medium communication network, broadcast wave, etc.
  • one aspect of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the above program is embodied by electronic transmission.
  • a transmission means for transmitting pulsed light via an optical fiber A receiving means for receiving backscattered light of the pulsed light from the optical fiber, and A detection means for detecting the environmental state around the optical fiber from the backscattered light, and A specific means for identifying the sagging of the optical fiber from the detection result of the detection means, and Specific system with.
  • Appendix 2 The specific system according to Appendix 1, wherein the environmental state is vibration.
  • Appendix 3 The specific system according to Appendix 1, wherein the environmental state is temperature.
  • the detection means detects at least one of (i) a temporal variation of the environmental state at a certain position on the optical fiber and (ii) a spatial distribution on the optical fiber at a certain time point. Specific system described in any one of 3 to 3
  • optical fiber is branched into a plurality of branched fibers by an optical splitter.
  • the specific system according to any one of Supplementary note 1 to 8, wherein the specific means identifies a candidate for a branched fiber in which sagging occurs from the usage status of each branched fiber.
  • the specific means identifies any of the appendices 1 to 9 by using a learning model in which the relationship between the environmental state detected by the detection means and the hanging of the optical fiber is learned.
  • An acquisition means for acquiring information indicating backscattered light of the pulsed light received from the optical fiber to which the pulsed light is transmitted, and an acquisition means.
  • a detection means for detecting the environmental state around the optical fiber from the information indicating the backscattered light, and A specific means for identifying the sagging of the optical fiber from the detection result of the detection means, and Specific device including.
  • Pulsed light is transmitted via an optical fiber, The backscattered light of the pulsed light is received from the optical fiber, The environmental condition around the optical fiber is detected from the backscattered light, The sagging of the optical fiber is identified from the result of the detection. Specific method.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Light Guides In General And Applications Therefor (AREA)
PCT/JP2021/012488 2020-03-26 2021-03-25 特定システム、特定装置および特定方法 Ceased WO2021193807A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US17/802,260 US20230078369A1 (en) 2020-03-26 2021-03-25 Identification system, identification device, and identification method
JP2022510651A JP7343043B2 (ja) 2020-03-26 2021-03-25 特定システム、特定装置および特定方法
JP2023112806A JP7517555B2 (ja) 2020-03-26 2023-07-10 特定システム、特定装置および特定方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-055613 2020-03-26
JP2020055613 2020-03-26

Publications (1)

Publication Number Publication Date
WO2021193807A1 true WO2021193807A1 (ja) 2021-09-30

Family

ID=77891876

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/012488 Ceased WO2021193807A1 (ja) 2020-03-26 2021-03-25 特定システム、特定装置および特定方法

Country Status (3)

Country Link
US (1) US20230078369A1 (https=)
JP (2) JP7343043B2 (https=)
WO (1) WO2021193807A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4571677A4 (en) * 2022-09-29 2025-12-10 Huawei Tech Co Ltd METHOD AND DEVICE FOR DETECTING OPTICAL CABLE SLAG

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02187641A (ja) * 1989-01-17 1990-07-23 Fujikura Ltd 光ファイバ線路状態の監視方法
JPH09105701A (ja) * 1995-10-09 1997-04-22 Fujikura Ltd 光ファイバ歪測定装置
JP2006145465A (ja) * 2004-11-24 2006-06-08 Japan Atomic Energy Agency マルチ情報計測用光ファイバ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080011514A1 (en) * 2006-07-14 2008-01-17 Tenvera, Inc. Optical Fiber Distribution Apparatus and Method
JP4819165B2 (ja) * 2010-01-13 2011-11-24 株式会社日立製作所 光通信システム及びその監視方法
JP6277141B2 (ja) * 2015-02-02 2018-02-07 日本電信電話株式会社 分岐を有する長距離光ファイバの試験方法、及び装置
US10205552B2 (en) * 2017-01-20 2019-02-12 Cox Communications, Inc. Optical communications module link, systems, and methods
US10571509B2 (en) * 2017-10-17 2020-02-25 Facebook, Inc. Systems and methods for distributed sensing of a powerline conductor
US11512584B2 (en) * 2020-01-31 2022-11-29 Halliburton Energy Services, Inc. Fiber optic distributed temperature sensing of annular cement curing using a cement plug deployment system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02187641A (ja) * 1989-01-17 1990-07-23 Fujikura Ltd 光ファイバ線路状態の監視方法
JPH09105701A (ja) * 1995-10-09 1997-04-22 Fujikura Ltd 光ファイバ歪測定装置
JP2006145465A (ja) * 2004-11-24 2006-06-08 Japan Atomic Energy Agency マルチ情報計測用光ファイバ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
OKAMOTO, TATSUYA ET AL.: "Identification of sagging aerial cable section by measuring optical fiber vibration distribution", LECTURE PROCEEDINGS OF THE IEICE GENERAL CONFERENCE 2019, 2019, pages 303 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4571677A4 (en) * 2022-09-29 2025-12-10 Huawei Tech Co Ltd METHOD AND DEVICE FOR DETECTING OPTICAL CABLE SLAG

Also Published As

Publication number Publication date
US20230078369A1 (en) 2023-03-16
JP7517555B2 (ja) 2024-07-17
JP7343043B2 (ja) 2023-09-12
JP2023145498A (ja) 2023-10-11
JPWO2021193807A1 (https=) 2021-09-30

Similar Documents

Publication Publication Date Title
JP2019207240A (ja) 侵入を最小にするファイバ識別のための方法、装置、およびシステム
US10979140B2 (en) Method and apparatus for detecting operational conditions of an optical link in an optical network
CN116032362A (zh) 光网络部件的健康预测方法、设备及光网络系统
US8953941B2 (en) Method and apparatus for identifying a port in a passive optical network
TW201315170A (zh) 光頻域反射式光纖網路測試方法
JP4324581B2 (ja) 光ネットワークにおける光ファイバ状態モニタリングデバイス及び方法
JP4762107B2 (ja) 異常ｏｎｕ特定装置、異常ｏｎｕ特定プログラムおよび異常ｏｎｕ特定方法
CN101296039B (zh) 被动式光纤网络的光纤链路监测系统及方法
CN103281122A (zh) 一种光缆在线监测装置及其提高告警准确率的方法
JP7517555B2 (ja) 特定システム、特定装置および特定方法
CN119182453A (zh) 一种光纤状态监测方法、装置、设备、介质及产品
JP2024540441A (ja) 分散型光ファイバセンシングを利用した切断ポイントの無いファイバの識別
CN105205960A (zh) 一种光纤周界入侵报警系统
WO2023073876A1 (ja) 光ファイバセンシングシステム、光ファイバセンシング方法、及びｏｎｕ
CN203261335U (zh) 一种光缆在线监测装置
CN109510663A (zh) 一种基于智能光纤配线进行光缆监测及大数据分析的系统和方法
WO2021176581A1 (ja) 監視システム、監視装置、及び監視方法
US20220345213A1 (en) Identifying link fingerprint anomalies in real-time in an all-photonics network
Malik et al. Sop-based anomaly detection leveraging machine learning for proactive optical restoration
Zhu et al. Distributed Acoustic Sensing over PON Architecture by using Enhanced Scattering Fiber
US20230145781A1 (en) Telecommunications remote terminal field device monitoring using distributed fiber optic sensing
US20150294561A1 (en) Optical Fiber-Based Remote Gas Leakage Monitoring
WO2021166686A1 (ja) 障害検出装置、障害検出方法及び海底ケーブルシステム
WO2022159906A1 (en) Detection of static weight on aerial telecommunications optical fibers using das ambient data
Huang et al. The requirement and technology of sensing in optical access network

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21775503

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2022510651

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21775503

Country of ref document: EP

Kind code of ref document: A1