WO2012092697A1 - 一种利用光缆跟踪仪进行光缆测距的方法和光缆跟踪仪 - Google Patents
一种利用光缆跟踪仪进行光缆测距的方法和光缆跟踪仪 Download PDFInfo
- Publication number
- WO2012092697A1 WO2012092697A1 PCT/CN2011/001826 CN2011001826W WO2012092697A1 WO 2012092697 A1 WO2012092697 A1 WO 2012092697A1 CN 2011001826 W CN2011001826 W CN 2011001826W WO 2012092697 A1 WO2012092697 A1 WO 2012092697A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical
- cable
- light
- signal
- tracker
- Prior art date
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Classifications
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/026—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring distance between sensor and object
-
- 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 the field of optical cable ranging, and in particular to a method for optical cable ranging using a cable tracker and a cable optical cable tracker.
- Background Art In order to facilitate maintenance and alteration of an optical cable, an optical cable connected between two telecommunication offices is usually affixed with an identified tag. That is, through the identification on the label, the service personnel can know the information including the source of the cable. However, in practice, the technicians found that the labeled tag is easily lost, and once the tag is lost, it is difficult for the technician to determine which fiber is received by the terminating end.
- the existing methods for identifying optical cables are as follows:
- the method 1 is not suitable for judging the optical cable from a long distance; the method 2 requires the optical cable to have a metal extension cable, and the range in which it can be used is limited; the method 3 bends the middle portion of the optical fiber and identifies it by measuring the light intensity of the optical fiber output, but In the state of the optical cable, the optical fiber is not easily bent; the method 4 is easy to be misjudged and the optical cable being communicated is interrupted. Therefore, the above methods have certain defects and limitations.
- the invention of Application No. 20061 0111545. 5 provides an optical cable identification device and an optical cable identification method for distinguishing different optical cables by perturbing the optical cable and then corresponding interference generated by light in the optical cable.
- a first object of the present invention is to provide a method for optical cable ranging using a cable tracker to solve the technical problem that the optical cable tracker cannot be used for cable ranging in the prior art.
- a second object of the present invention is to provide a fiber optic cable tracker to solve the technical problem that the optical cable tracker cannot be used for cable ranging and the cable accident point is more conveniently determined.
- a method for cable ranging using a cable tracker includes the following steps:
- the cable tracker further comprising a light source, at least two optical couplers, a phase modulator, a roll of delay fiber and an optical signal demodulation module, the light source, a light a coupler, a phase modulator, and another optical coupler are connected in series, the optical signal demodulation module is connected in parallel with the light source, and the delay fiber is connected in parallel with the phase modulator;
- the light source in the cable tracker is first used to provide a beam of incident light, and then the light output is connected to at least one fiber in the cable to be tested, and at the test point of the cable to be tested. Beating on the beat;
- the incident light splits the incident light of the light source into two paths of light through the first optical coupler, and passes through a phase modulator and a roll of delay fiber, respectively, and then passes through two incident rays of the phase modulator and the delay fiber.
- the second optical coupler merges, and the combined light is incident on the optical cable to be tested, and the phase change is caused in the optical fiber after receiving the tapping disturbance, and part of the output light is reflected back through the optical cable at the other end of the optical cable;
- step (6) the calculation formula described in step (6) is:
- Step (5) gives a multiplication factor S, and a double frequency coefficient S 2
- S 2 is a double frequency coefficient
- ⁇ ⁇ ( ⁇ is the power spectrum
- ⁇ ( , 2 , A )
- ZZ is the distance from the point Z to the point
- ⁇ is the first and second order respectively.
- the method for demodulating the optical signal to be tested in the step (5) comprises: A1: converting the optical signal to be measured into an electrical signal; A2: performing low-noise high-precision amplification on the electrical signal to be tested;
- A3 Gain the signal with low noise and high precision amplification, and ensure that the input optical signal changes within a preset range to keep the output electrical signal constant;
- A4 Filtering the signal after gain
- A5 phase-locking the filtered signal
- A6 low-pass filtering the signal after phase-locked amplification, filtering out high-frequency components, and obtaining a multiplication factor 3 and a double-frequency coefficient S 2 ;
- A7 The processed electrical signal is converted into a digital signal by a digital conversion module.
- the length of the delay fiber is not less than lkm.
- the present invention also provides a cable tracker for cable ranging using a cable tracker, comprising a light source, two optical couplers, a phase modulator, a roll of delay fiber and an optical signal demodulation.
- a module wherein the light source, an optical coupler, a phase modulator, and another optical coupler are sequentially connected in series, and the end optical coupler is directly connected to the optical cable to be tested, and the optical signal demodulation module and the light source are Connected in parallel, the delay fiber is connected in parallel with the phase modulator.
- the optical signal demodulation module comprises a photodetection and preamplifier module, a main amplifier and a gain module, a band pass filter, a signal extraction module, a digital to analog conversion module and a microprocessor, and the components are sequentially connected.
- the photodetection and preamplifier module consists of a photodetector and a preamplifier.
- the main amplifier and gain block are comprised of an amplifier and an automatic gain control module.
- the signal extraction module consists of a lock-in amplifier and a low-pass filter amplifier.
- the microprocessor calculates according to the following formula:
- the Bes se l function is related to the amplitude of the signal voltage of the phase modulator, and E is the electric field strength. Compared with the prior art, it is not only able to identify the cable by tapping the disturbance cable, but also to give the distance of the disturbing position from the central end, which is more convenient for maintenance and repair of the cable.
- FIG. 1 is a flow chart of a cable distance measuring method
- FIG. 2 is a schematic diagram of an optical signal demodulation module of a cable tracker that can be used for ranging
- FIG. 3 is a photoelectric detecting and preamplifying circuit diagram
- FIG. 4 is a main amplifier and a gain module. Circuit diagram
- Figure 5 bandpass filter circuit diagram
- Figure 6 lock-in amplifier circuit diagram.
- DETAILED DESCRIPTION OF THE INVENTION The present invention will be further described in detail below with reference to the accompanying drawings.
- the invention also provides a cable tracker for cable ranging using a cable tracker, comprising an ASE light source 1, an optical coupler 2 and an optical coupler 5, a phase modulator 3, a roll of delay fiber 4 and an optical signal solution. Module 7.
- the light source 1, the optical coupler 2, the phase modulator 3, and the other optical coupler 5 are sequentially connected in series, the optical signal demodulating module 7 is connected in parallel with the light source 1, and the delay optical fiber 4 is connected in parallel with the phase modulator 3, and the optical coupler 5 is connected. Directly connected to the optical cable 6 to be tested.
- the optical signal demodulation module includes a photodetection and preamplifier module 71, a main amplifier and gain module 72, a band pass filter 73, a signal extraction module 74, a digital to analog conversion module 75, and a microprocessor 76, which are sequentially connected.
- the preamplifier module 71 is composed of a photodetector 711 and a preamplifier 712.
- the main amplifier and gain block 72 is comprised of an amplifier 722 and an automatic gain control module 721.
- the signal extraction module 74 is comprised of a lock-in amplifier 741 and a low pass filter amplifier 742.
- the microprocessor calculates according to the following formula:
- 3 is a octave coefficient
- S 2 is a double octave coefficient
- ⁇ ⁇ (for the power spectrum, is the frequency, ⁇ 0 , 1 , 2 ⁇ , indicating that the light is disturbed by the disturbance point
- c is the speed of light
- ZD is the distance from the point to the point
- J 2 is the first and second order, respectively.
- Photodetection 711 and preamplifier circuit 712 can directly use a PIN component and an APD component.
- the component includes a PIN photodiode and an APD avalanche photodiode and a preamplifier, the output of which can be directly amplified by the main amplifier.
- the AD8605 precision low-noise op amp is used to form the transimpedance amplifier circuit as the pre-position.
- the main amplifier and gain block 72 is composed of a voltage controlled gain amplifying circuit AD603, which is cascaded in two stages.
- the input signal is input by 3 pins and output by 7 pins.
- the pin of AD603 implements gain control with a supply voltage of ⁇ 5V.
- the band pass filter 73 performs preliminary filtering on the signal
- the ADA4891 constitutes two voltage-controlled voltage source type filter circuits whose center frequencies are the primary fundamental wave and the second harmonic of the signal, respectively, and are respectively phase-locked and amplified.
- the optical signal is a weak signal in the background of strong noise.
- the lock-in amplifier 741 is needed to extract the useful signal. As shown in Fig.
- the lock-in amplifier 741 is composed of MLT04, and no external component is required, and the power is supplied at ⁇ 5V. After phase-locked amplification, the signal should be low-pass filtered and converted into an electrical signal by an analog-to-digital conversion circuit and sent to a microprocessor connected to the optical signal demodulation module for mathematical calculation, and finally the distance from the beat point to the central end is obtained. As shown in FIG.
- the present invention also relates to a method for optical cable ranging using a cable tracker, comprising the following steps: (1) Providing a cable tracker comprising an ASE light source 1, an optical coupler 2 and an optical coupler 5, a phase modulator 3, a delay fiber 4 and an optical signal demodulation module 7, a light source 1, an optical coupler 2, and a phase modulation
- the optical coupler 5 is sequentially connected in series, the optical signal demodulation module 7 is connected in parallel with the light source 1, and the delay optical fiber 4 is connected in parallel with the phase modulator 3.
- the ASE source 1 in the cable tracker is used to provide a beam of incident light, and then the light output is connected to at least one fiber in the cable 6 to be tested, and the cable to be tested is used. Beating the test point Z;
- the incident light splits the incident light of the light source 1 into two paths of light through the first photocoupler 2, passes through the phase modulator 3 and the delay fiber 4, respectively, and passes through two paths of the phase modulator 3 and the delay fiber 4
- the light is merged by the second optical coupler 5, and the combined light is incident on the optical cable 6 to be tested, and the phase change is caused in the optical fiber after receiving the tapping disturbance, and part of the output light is reflected back through the optical cable 6 at the other end of the optical cable;
- the light wave of the ABCZDZCEF optical path at the point F can be expressed as:
- the interference intensity detected by the detector is:
- the basic style can be expanded to:
- step (6) The calculation formula described in step (6) is:
- 3 is a frequency doubling coefficient
- S 2 is a double frequency coefficient
- ⁇ ⁇ ) is a phase difference of light
- the power spectrum, for the frequency, ⁇ 0 , 1 , 2 ⁇ , ⁇ represents the time after which the light passes through the disturbance point Z to point D and then reflects back to the Z point
- c is the speed of light
- ZZ is the distance from the point Z to the point
- J , and J 2 are first and second order, respectively
- the Bes sel function is related to the amplitude of the signal voltage of the phase modulator, and E is the electric field strength.
- the method for demodulating the optical signal to be tested in the step (5) includes: A1: converting the optical signal to be measured into an electrical signal;
- A2 Low noise and high precision amplification of the measured electrical signal
- A3 Gain the signal with low noise and high precision amplification, and ensure that the input optical signal changes within a preset range to keep the output electrical signal constant;
- A4 Filtering the signal after gain
- A5 phase-locking the filtered signal
- A6 low-pass filtering the signal after phase-locked amplification, filtering out high-frequency components, and obtaining a multiplication factor 3 1 and a double frequency coefficient S 2 ;
- A7 The processed electrical signal is converted into a digital signal by a digital conversion module.
- the length of the delay fiber 4 is not less than 1 km.
- the present invention can not only identify the cable by tapping the disturbance cable, but also can give the distance of the striking disturbance position from the central end, which is more convenient for maintenance and repair of the cable.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Gyroscopes (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020137008966A KR101473287B1 (ko) | 2011-01-07 | 2011-10-31 | 광케이블 추적장치를 이용하여 광케이블 거리를 측정하는 방법과 광케이블 추적장치 |
US13/978,627 US20130293901A1 (en) | 2011-01-07 | 2011-10-31 | Method for optical cable distance measurement by using optical cable tracker and optical cable tracker |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN201110002455.3 | 2011-01-07 | ||
CN201110002455.3A CN102208942B (zh) | 2011-01-07 | 2011-01-07 | 一种利用光缆跟踪仪进行光缆测距的方法和光缆跟踪仪 |
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WO2012092697A1 true WO2012092697A1 (zh) | 2012-07-12 |
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PCT/CN2011/001826 WO2012092697A1 (zh) | 2011-01-07 | 2011-10-31 | 一种利用光缆跟踪仪进行光缆测距的方法和光缆跟踪仪 |
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US (1) | US20130293901A1 (zh) |
KR (1) | KR101473287B1 (zh) |
CN (1) | CN102208942B (zh) |
WO (1) | WO2012092697A1 (zh) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102208942B (zh) * | 2011-01-07 | 2015-02-11 | 大豪信息技术(威海)有限公司 | 一种利用光缆跟踪仪进行光缆测距的方法和光缆跟踪仪 |
CN103095366A (zh) * | 2011-11-08 | 2013-05-08 | 上海嘉慧光电子技术有限公司 | 基于光路干涉原理的光缆与光纤识别仪 |
CN102401730A (zh) * | 2011-11-21 | 2012-04-04 | 北京交通大学 | 一种自组织光纤光缆识别仪 |
CN103281118B (zh) * | 2013-05-31 | 2015-11-25 | 合肥融讯电子科技有限公司 | 基于光纤干涉互相关算法的光缆识别物理定位仪的识别定位方法 |
CN103486972A (zh) * | 2013-09-11 | 2014-01-01 | 北京航空航天大学 | 一种带有相位调制功能的激光反馈干涉集成微位移测量系统 |
CN106644398B (zh) * | 2016-12-30 | 2019-02-26 | 中国科学院深圳先进技术研究院 | 一种海底光缆故障点定位方法 |
CN107730798B (zh) * | 2017-08-29 | 2023-10-10 | 深圳市信海通科技有限公司 | 一种预警系统及方法 |
CN109941308B (zh) * | 2019-03-21 | 2020-07-07 | 北京交通大学 | 一种基于光纤m-z干涉的异常扰动信号分析方法 |
CN113438020B (zh) * | 2020-03-23 | 2022-08-19 | 华为技术有限公司 | 一种同缆概率检测的方法以及装置 |
RU2762706C1 (ru) * | 2021-05-24 | 2021-12-22 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Поволжский государственный университет телекоммуникаций и информатики" | Способ электронного маркирования трассы оптоволоконного кабеля |
CN115208468B (zh) * | 2022-09-14 | 2022-11-18 | 高勘(广州)技术有限公司 | 光缆路由点的确定方法、装置、系统及存储介质 |
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WO2006001868A2 (en) * | 2004-06-15 | 2006-01-05 | Optellios, Inc. | Phase responsive optical fiber sensor |
CN101051869A (zh) * | 2007-05-17 | 2007-10-10 | 上海光朗信通讯技术有限公司 | 光缆通信线路安防监控系统 |
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CN102208942A (zh) * | 2011-01-07 | 2011-10-05 | 一诺仪器(威海)有限公司 | 一种利用光缆跟踪仪进行光缆测距的方法和光缆跟踪仪 |
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US7557930B2 (en) * | 2004-11-23 | 2009-07-07 | Lockheed Martin Corporation | Bessel beam interferometer and measurement method |
EP1757966A3 (en) * | 2005-08-23 | 2007-12-19 | KT Corporation | Apparatus and method for identification of optical cable |
CN101216149A (zh) * | 2007-12-27 | 2008-07-09 | 电子科技大学 | 长距离管线安全监测的光纤分布式监测方法及装置 |
-
2011
- 2011-01-07 CN CN201110002455.3A patent/CN102208942B/zh not_active Expired - Fee Related
- 2011-10-31 WO PCT/CN2011/001826 patent/WO2012092697A1/zh active Application Filing
- 2011-10-31 US US13/978,627 patent/US20130293901A1/en not_active Abandoned
- 2011-10-31 KR KR1020137008966A patent/KR101473287B1/ko active IP Right Grant
Patent Citations (4)
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WO2006001868A2 (en) * | 2004-06-15 | 2006-01-05 | Optellios, Inc. | Phase responsive optical fiber sensor |
CN101410696A (zh) * | 2006-04-03 | 2009-04-15 | 英国电讯有限公司 | 干扰位置的估计 |
CN101051869A (zh) * | 2007-05-17 | 2007-10-10 | 上海光朗信通讯技术有限公司 | 光缆通信线路安防监控系统 |
CN102208942A (zh) * | 2011-01-07 | 2011-10-05 | 一诺仪器(威海)有限公司 | 一种利用光缆跟踪仪进行光缆测距的方法和光缆跟踪仪 |
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Publication number | Publication date |
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CN102208942B (zh) | 2015-02-11 |
KR101473287B1 (ko) | 2014-12-16 |
US20130293901A1 (en) | 2013-11-07 |
CN102208942A (zh) | 2011-10-05 |
KR20130127436A (ko) | 2013-11-22 |
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