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JPS57120836A - Method for searching fault of optical fiber - Google Patents

Method for searching fault of optical fiber

Info

Publication number
JPS57120836A
JPS57120836A JP683781A JP683781A JPS57120836A JP S57120836 A JPS57120836 A JP S57120836A JP 683781 A JP683781 A JP 683781A JP 683781 A JP683781 A JP 683781A JP S57120836 A JPS57120836 A JP S57120836A
Authority
JP
Japan
Prior art keywords
light
incident
time
optical fiber
modulated
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.)
Pending
Application number
JP683781A
Other languages
Japanese (ja)
Inventor
Kenji Okada
Kunio Hashimoto
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP683781A priority Critical patent/JPS57120836A/en
Publication of JPS57120836A publication Critical patent/JPS57120836A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G01M11/3172—Reflectometers detecting the back-scattered light in the frequency-domain, e.g. OFDR, FMCW, heterodyne detection

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

PURPOSE:To narrow receiving band width by making modulated light incident to an optical fiber, receiving the light reflected from the fiber, changing the modulating frequency component of the reflected light in the same way as that of the modulating frequency of the incident light and extracting the same. CONSTITUTION:When the light 14 modulated by the repetitive signals obtained by changing a frequency f[Hz]so as to increase monotonously with time is made incident to an optical fiber 11, backward scattered and reflected light is generated at each point in accordance with the advancing of said modulated light 4. After the time T1[sec]since the initial incidence of the light, the backward scattered and reflected light 15 by the incident modulated light is begun to be received, and the frequency to be extracted from the received light 15 is changed with time in the same manner as with the frequency f of the light 14, whereby the modulating frequency component is extracted and the intensity L of the light 15 from the backward scattering and reflecting point corresponding to the both-way time of the time T1 is determined. Here, the distance S1 [m]between the incident point and the scattering point is determined by S1=VXT1/2 (where, V is the velocity of light in an optical fiber 11[m/sec]).
JP683781A 1981-01-19 1981-01-19 Method for searching fault of optical fiber Pending JPS57120836A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP683781A JPS57120836A (en) 1981-01-19 1981-01-19 Method for searching fault of optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP683781A JPS57120836A (en) 1981-01-19 1981-01-19 Method for searching fault of optical fiber

Publications (1)

Publication Number Publication Date
JPS57120836A true JPS57120836A (en) 1982-07-28

Family

ID=11649344

Family Applications (1)

Application Number Title Priority Date Filing Date
JP683781A Pending JPS57120836A (en) 1981-01-19 1981-01-19 Method for searching fault of optical fiber

Country Status (1)

Country Link
JP (1) JPS57120836A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS626703U (en) * 1985-06-26 1987-01-16
JPS62217135A (en) * 1986-03-19 1987-09-24 Anritsu Corp Coherent otdr device
US5307140A (en) * 1989-12-28 1994-04-26 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Optical time domain reflectometer with improved sidelobe suppression

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS626703U (en) * 1985-06-26 1987-01-16
JPS62217135A (en) * 1986-03-19 1987-09-24 Anritsu Corp Coherent otdr device
US5307140A (en) * 1989-12-28 1994-04-26 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Optical time domain reflectometer with improved sidelobe suppression
GB2256555B (en) * 1989-12-28 1994-05-04 Secr Defence Optical time domain relfectometer

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