WO2005095917A3 - Evaluating the position of a time-varying disturbance - Google Patents

Evaluating the position of a time-varying disturbance Download PDF

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Publication number
WO2005095917A3
WO2005095917A3 PCT/GB2005/001269 GB2005001269W WO2005095917A3 WO 2005095917 A3 WO2005095917 A3 WO 2005095917A3 GB 2005001269 W GB2005001269 W GB 2005001269W WO 2005095917 A3 WO2005095917 A3 WO 2005095917A3
Authority
WO
WIPO (PCT)
Prior art keywords
time
disturbance
pulse
optical
pair
Prior art date
Application number
PCT/GB2005/001269
Other languages
French (fr)
Other versions
WO2005095917A2 (en
Inventor
Peter Healey
Edmund Sergio Robert Sikora
Original Assignee
British Telecomm
Peter Healey
Edmund Sergio Robert Sikora
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 British Telecomm, Peter Healey, Edmund Sergio Robert Sikora filed Critical British Telecomm
Priority to KR1020067022655A priority Critical patent/KR101397775B1/en
Priority to CA002560780A priority patent/CA2560780A1/en
Priority to US10/594,433 priority patent/US7974182B2/en
Priority to JP2007505635A priority patent/JP4880586B2/en
Priority to CN2005800099054A priority patent/CN1938575B/en
Priority to EP05733029.2A priority patent/EP1747445B1/en
Publication of WO2005095917A2 publication Critical patent/WO2005095917A2/en
Publication of WO2005095917A3 publication Critical patent/WO2005095917A3/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35303Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using a reference fibre, e.g. interferometric devices
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/31Testing 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
    • G01M11/3172Reflectometers detecting the back-scattered light in the frequency-domain, e.g. OFDR, FMCW, heterodyne detection

Abstract

The present invention relates to a method of and apparatus for evaluating the position of a disturbance on an optical link, in particular where the disturbance is a time-varying disturbance. An optical time domain reflectometry technique is used in which a series of low coherence test pulses is launched by means of an optical pulse source (18) into an the optical link (16), and the backscattered return signal is monitored. The test pulses pass through an unbalanced Mach Zhender interferometer (20) with the result that for each test pulse, a pair of time-displaced pulse copies is launched onto the link (16). The backscattered return signal is passed through the same interferometer (20), which causes the pulse copes of each pair to become realigned and to interfere with one another. A time-varying disturbance (x) is likely to affect each pulse copy of a pair differently. As a result, an abnormality such as a step is likely occur in the backscattered signal. From the time position of an abnormality, the distance of the disturbance responsible is evaluated.
PCT/GB2005/001269 2004-03-31 2005-03-31 Evaluating the position of a time-varying disturbance WO2005095917A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1020067022655A KR101397775B1 (en) 2004-03-31 2005-03-31 Evaluating the position of a time-varying disturbance
CA002560780A CA2560780A1 (en) 2004-03-31 2005-03-31 Evaluating the position of a time-varying disturbance
US10/594,433 US7974182B2 (en) 2004-03-31 2005-03-31 Evaluating the position of a disturbance
JP2007505635A JP4880586B2 (en) 2004-03-31 2005-03-31 Disturbance location assessment
CN2005800099054A CN1938575B (en) 2004-03-31 2005-03-31 Evaluating the position of disturbance
EP05733029.2A EP1747445B1 (en) 2004-03-31 2005-03-31 Evaluating the position of a time-varying disturbance

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0407386.2 2004-03-31
GBGB0407386.2A GB0407386D0 (en) 2004-03-31 2004-03-31 Monitoring a communications link

Publications (2)

Publication Number Publication Date
WO2005095917A2 WO2005095917A2 (en) 2005-10-13
WO2005095917A3 true WO2005095917A3 (en) 2005-11-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/001269 WO2005095917A2 (en) 2004-03-31 2005-03-31 Evaluating the position of a time-varying disturbance

Country Status (8)

Country Link
US (1) US7974182B2 (en)
EP (1) EP1747445B1 (en)
JP (1) JP4880586B2 (en)
KR (1) KR101397775B1 (en)
CN (1) CN1938575B (en)
CA (1) CA2560780A1 (en)
GB (1) GB0407386D0 (en)
WO (1) WO2005095917A2 (en)

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