WO2023053323A1 - Dispositif et procédé pour identifier la position d'un équipement à fibre optique - Google Patents

Dispositif et procédé pour identifier la position d'un équipement à fibre optique Download PDF

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Publication number
WO2023053323A1
WO2023053323A1 PCT/JP2021/036091 JP2021036091W WO2023053323A1 WO 2023053323 A1 WO2023053323 A1 WO 2023053323A1 JP 2021036091 W JP2021036091 W JP 2021036091W WO 2023053323 A1 WO2023053323 A1 WO 2023053323A1
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WIPO (PCT)
Prior art keywords
optical fiber
brillouin
facility
equipment
scattered light
Prior art date
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PCT/JP2021/036091
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English (en)
Japanese (ja)
Inventor
千尋 鬼頭
友和 小田
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日本電信電話株式会社
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Application filed by 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to JP2023550890A priority Critical patent/JPWO2023053323A1/ja
Priority to PCT/JP2021/036091 priority patent/WO2023053323A1/fr
Publication of WO2023053323A1 publication Critical patent/WO2023053323A1/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 disclosure relates to technology for identifying the location of equipment in which optical fibers are arranged.
  • the length information of the optical cable is recorded based on the length indicated on the outer sheath of the constructed optical cable.
  • optical fiber measurement technology such as OTDR (Optical Time Domain Reflectometer) measurement at the time of failure of the optical cable or malfunction such as closure flooding
  • the actual length measurement result is not the total length. Therefore, the location of the failure is searched for on-site while matching the length information at the time of construction with the actual length measurement result of the OTDR measurement.
  • the difference between the total length and the actual length may become large due to the extra length of the optical cable or the optical core wire, and it may be difficult to identify the location of the facility.
  • the present disclosure aims to make it possible to identify the location of equipment in which optical fibers are arranged.
  • the present disclosure has been made in response to the above problems, and for feature points that exist or occur in the longitudinal direction of the optical fiber and are shorter than the spatial resolution ⁇ z, the Brillouin gain bandwidth is measured using an optical fiber measurement technique using Brillouin scattering. By measuring the change, the position of facilities such as manholes and aerial closures can be specified.
  • the apparatus and methods of the present disclosure include: An apparatus and method for locating a facility in which an optical fiber is located, comprising: Measuring Brillouin scattered light in the optical fiber using test light with a pulse width that makes the spatial resolution greater than that of the equipment, The Brillouin gain bandwidth of the measured Brillouin scattered light is used to locate the installation along the length of the optical fiber.
  • FIG. 1 shows a system configuration example of the present disclosure
  • An example of an underground infrastructure facility that accommodates a lower optical cable is shown. It is an example of the Brillouin gain spectrum obtained at each measurement point, (a) shows the measurement point M1, (b) shows the measurement point M2, and (c) shows the measurement point M3.
  • 4 shows an example of feel test results according to the present embodiment.
  • FIG. 1 shows a system configuration example of the present disclosure.
  • the equipment position specifying device 10 of the present disclosure includes a BOTDR or BOTDA 11 connected to an optical fiber 100, and an arithmetic processing unit 12 that performs arithmetic processing using the measurement results of the BOTDR or BOTDA.
  • the optical fiber 100 may be placed in any facility identified in this disclosure.
  • facilities include, for example, pipelines, manholes, handholes, and underground closures in the case of underground infrastructure facilities.
  • Examples of overhead infrastructure equipment include overhead optical cables, overhead closures, and utility poles.
  • the BOTDR or BOTDA 11 measures Brillouin scattered light in the optical fiber 100 using test light having a pulse width W according to the equipment.
  • the pulse width W By setting the pulse width W in BOTDR or BOTDA11, the spatial resolution ⁇ z for measuring Brillouin scattered light can be determined. Therefore, in the present disclosure, by setting the pulse width W, the interval length at each measurement point is set.
  • the arithmetic processing unit 12 identifies the position of the facility in the optical fiber 100 using the Brillouin gain bandwidth of the Brillouin scattered light measured by the BOTDR or BOTDA 11 .
  • the arithmetic processing unit 12 of the present disclosure can also be realized by a computer and a program, and the program can be recorded on a recording medium or provided through a network.
  • the BOTDR or BOTDA 11 of the present disclosure uses a pulse width W corresponding to a spatial resolution ⁇ z greater than the event to be detected to measure two or more Brillouin scattered lights with different BFSs existing within the spatial resolution ⁇ z.
  • the arithmetic processing unit 12 can obtain a waveform obtained by synthesizing two or more Brillouin gain spectra (BGS) with different BFSs included in the spatial resolution ⁇ z.
  • BGS Brillouin gain spectra
  • the arithmetic processing unit 12 can specify the position of the manhole that is a characteristic change point.
  • the arithmetic processing unit 12 can identify the aerial closure position, which is a characteristic change point.
  • Fig. 2 shows an example of underground infrastructure facilities that accommodate underground optical cables.
  • the facility section S1 and the facility section S3 are pipelines 101, and the facility section S2 is the manhole 102.
  • FIG. In this embodiment, the case of detecting the position of the manhole 102 in the longitudinal direction of the optical fiber 100 will be described.
  • the facility location identification method of the present disclosure has the following procedures.
  • Step 1 Set the measurement spatial resolution ⁇ z from the same value as the manhole (2 m) to a value larger by about 300% at maximum.
  • Step 2 BOTDR or BOTDA is used to measure each of the installation sections S1 to S3 with a pulse width W corresponding to the measurement spatial resolution ⁇ z.
  • Step 3 Analyze the BGS width obtained as a result of the measurement.
  • Step 4 Identify the position where the BGS width abruptly changes (a spike is observed).
  • Step 5 Record the interspike distance from step 4 as the actual cable length.
  • the length of the manhole skeleton is about 3 m, and the optical fiber 100 of 5 m to 10 m including the extra length is accommodated in the section of the manhole 102 .
  • BOTDR or BOTDA with a pulse width that makes the measurement spatial resolution ⁇ z 2 m or more is used. .
  • the upper limit of the pulse width W is arbitrary, but for example, the measurement spatial resolution ⁇ z can be set to a value about 300% larger than the length of the manhole skeleton. For example, if the facility is a manhole, the pulse width W can be set such that the measurement spatial resolution ⁇ z is 6 m or less.
  • step 2 Brillouin gain spectra corresponding to BFS 1 in the installation section S1, BFS 2 in the installation section S2, and BFS 3 in the installation section S3 are obtained by measuring the Brillouin scattered light generated by the test light.
  • the BFS of the equipment sections S1 and S3 may be the same. BFS is known to change depending on temperature, strain applied to the optical cable, type and design parameters of the optical fiber 100, and production lot. It is safe to assume that it is almost constant inside.
  • the measurement points M1 to M3 are different points measured at the spatial resolution ⁇ z, have the same interval length according to the pulse width W, and are all 1 m or longer.
  • the measurement point M1 and the measurement point M3 are set to measure only the pipeline section, and the measurement point M2 is set so as to straddle the pipeline section and the manhole section.
  • FIG. 3 shows an example of BGS obtained at each measurement point.
  • FIGS. 3(a) and 3(c) at the measurement points M1 and M3, sharp BGSs with narrow Brillouin gain bandwidths ⁇ G1 and ⁇ G3 are obtained because the BFS is invariant within the spatial resolution ⁇ z. can get.
  • FIG. 3(b) at the measurement point M2, three Brillouin gain spectra with different BFS derived from the installation sections S1, S2, and S3 are synthesized, and ⁇ G 2 is broader than ⁇ G 1 and ⁇ G 3 . Become.
  • test light with a pulse width W shorter than the measurement point M2 corresponding to the section lengths of the measurement points M2-1, M2-2, and M2-3 within the same pulse width W is BGS 2-1 with a different BFS, Resulting in BGS 2-2 , BGS 2-3 , the ⁇ G 2 of the synthesized BGS is broadened.
  • This is synonymous with the broadening of the BGS in the BOTDA and BOTDR measurement results using the narrow pulse width W of the test light due to the broadening of the frequency spectrum of the test light.
  • FIG. 4 shows an example of the feel test results according to this embodiment.
  • L BGS shows an example of a distance distribution of BGS widths according to this disclosure.
  • FIG. 4 shows the full width at half maximum (FWHM) as an example of the BGS width.
  • the points where spikes occur due to the widening of the BGS width indicate the positions of the manholes 102 , and the distance between the spikes corresponds to the actual length of the optical fiber cable laid between the manholes 102 .
  • LBFS is a comparative example of the present disclosure and shows the results of BFS measurements.
  • the BFS measurement results shown in L BFS it is difficult to specify the manhole position because the BFS may or may not change even if the facility section is different. Therefore, when using BFS, it is necessary to distinguish the equipment sections.
  • the BGS width of the present disclosure spikes due to the widening of the BGS width are clearly observed collectively at the manhole position, as indicated by LBGS .
  • step 3 the distance distribution of the BGS width is obtained as indicated by L BGS .
  • step 4 spike positions are identified.
  • the spacing of the spikes corresponds to the actual length of the cable laid between the manholes. Therefore, in step 5, the spike-to-spike distance is recorded as the actual cable length.
  • the present disclosure can collectively specify the positions of manholes, which are characteristic points of the equipment, in the underground optical equipment.
  • the present disclosure is not limited to this.
  • BOTDR or BOTDA with a pulse width W such that the measurement spatial resolution ⁇ z is equal to or greater than the length of the optical closure is used. Accordingly, the present disclosure can collectively locate aerial closures having connection points in an aerial optical installation.
  • the present disclosure detects whether a change occurs in the longitudinal direction of the optical fiber 100 by observing changes in the Brillouin gain bandwidth ⁇ BGS using BOTDA or BOTDR.
  • This allows the present disclosure to collectively locate any facility, such as manholes and aerial closures.
  • any facility such as manholes and aerial closures.
  • a pulse width with a measurement spatial resolution ⁇ z of 2 m or more it is possible to specify the positions of handholes, underground closures, aerial closures, and utility poles all at once. Therefore, according to the present disclosure, since it is possible to specify the position (actual length) to the equipment, it is possible to specify the actual fault position from the measurement result of the fault position by the OTDR.
  • This disclosure can be applied to the information and communications industry.
  • Equipment position specifying device 11 BOTDR or BOTDA 12: Arithmetic processing unit 100: Optical fiber 101: Pipe line 102: Manhole

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'objectif de la présente invention est de permettre l'identification de la position d'un équipement dans lequel est disposée une fibre optique.　La présente invention porte sur un dispositif (10) destiné à identifier la position d'un équipement dans lequel est disposée une fibre optique (100). La lumière diffusée par effet Brillouin dans la fibre optique est mesurée en utilisant une lumière d'essai dont la largeur d'impulsion permet d'obtenir une résolution spatiale supérieure à celle de l'équipement ; et la position de l'équipement dans la direction longitudinale de la fibre optique est identifiée en utilisant la largeur de bande du gain Brillouin de la lumière diffusée par effet Brillouin mesurée.
PCT/JP2021/036091 2021-09-30 2021-09-30 Dispositif et procédé pour identifier la position d'un équipement à fibre optique WO2023053323A1 (fr)

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JP2023550890A JPWO2023053323A1 (fr) 2021-09-30 2021-09-30
PCT/JP2021/036091 WO2023053323A1 (fr) 2021-09-30 2021-09-30 Dispositif et procédé pour identifier la position d'un équipement à fibre optique

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130308682A1 (en) * 2011-01-27 2013-11-21 Ramot At Tel Aviv University Ltd. Distributed and dynamical brillouin sensing in optical fibers
US20200370928A1 (en) * 2019-05-22 2020-11-26 Nec Laboratories America, Inc Amplifier dynamics compensation for brillouin optical time-domain reflectometry
JP2021131292A (ja) * 2020-02-19 2021-09-09 沖電気工業株式会社 光ファイバ歪み・温度測定装置及び光ファイバ歪み・温度測定方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130308682A1 (en) * 2011-01-27 2013-11-21 Ramot At Tel Aviv University Ltd. Distributed and dynamical brillouin sensing in optical fibers
US20200370928A1 (en) * 2019-05-22 2020-11-26 Nec Laboratories America, Inc Amplifier dynamics compensation for brillouin optical time-domain reflectometry
JP2021131292A (ja) * 2020-02-19 2021-09-09 沖電気工業株式会社 光ファイバ歪み・温度測定装置及び光ファイバ歪み・温度測定方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
LIN WENQIAO; YANG ZHISHENG; HONG XIAOBIN; WANG SHENG; WU JIAN: "Narrowing Brillouin gain spectrum for BOTDA sensor", 2017 25TH OPTICAL FIBER SENSORS CONFERENCE (OFS), IEEE, 24 April 2017 (2017-04-24), pages 1 - 4, XP033108437, DOI: 10.1117/12.2267646 *
Y. MAO ; N. GUO ; K. L. YU ; H. Y. TAM ; C. LU: "1-cm-Spatial-Resolution Brillouin Optical Time-Domain Analysis Based on Bright Pulse Brillouin Gain and Complementary Code", IEEE PHOTONICS JOURNAL, IEEE, USA, vol. 4, no. 6, 1 December 2012 (2012-12-01), USA , pages 2243 - 2248, XP011493187, ISSN: 1943-0655, DOI: 10.1109/JPHOT.2012.2226710 *

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