JPS57120837A - Method for searching fault of optical fiber cable - Google Patents

Method for searching fault of optical fiber cable

Info

Publication number
JPS57120837A
JPS57120837A JP700081A JP700081A JPS57120837A JP S57120837 A JPS57120837 A JP S57120837A JP 700081 A JP700081 A JP 700081A JP 700081 A JP700081 A JP 700081A JP S57120837 A JPS57120837 A JP S57120837A
Authority
JP
Japan
Prior art keywords
light pulses
light
optical fiber
receiver
scattering
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
JP700081A
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 JP700081A priority Critical patent/JPS57120837A/en
Publication of JPS57120837A publication Critical patent/JPS57120837A/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
    • G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
    • G01M11/3145—Details of the optoelectronics or data analysis

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (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 discriminate the delicate change in an optical fiber by making modulated light incident thereto, receiving the backward scattered light at different scattering points, and extracting the modulating frequency component from this. CONSTITUTION:The light pulses modulated by the signal of a repetitive frequency (f) corresponding to a period sufficiently shorter than the sustaining time of the light pulses is transmitted from a transmitter T via a directional coupler DC into a long optical fiber cable OF from its one end. These light pulses generate Rayleigh scattering or scattering at discontinuous points at the other end or the like and the light pulses by the backward scattered light return to the transmission side. These are led through the coupler DC to a receiver R. In the receiver R, the component of said frequency (f) is extracted from the received light pulses and the level thereof is measured. A gate is provided to the receiver R, and when this gate is opened to receive the inputting light pulses upon lapse of a prescribed time after the transmission of the light pulses from the transmitter T, the backward scattered light from the specific scattering point is received.
JP700081A 1981-01-20 1981-01-20 Method for searching fault of optical fiber cable Pending JPS57120837A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP700081A JPS57120837A (en) 1981-01-20 1981-01-20 Method for searching fault of optical fiber cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP700081A JPS57120837A (en) 1981-01-20 1981-01-20 Method for searching fault of optical fiber cable

Publications (1)

Publication Number Publication Date
JPS57120837A true JPS57120837A (en) 1982-07-28

Family

ID=11653823

Family Applications (1)

Application Number Title Priority Date Filing Date
JP700081A Pending JPS57120837A (en) 1981-01-20 1981-01-20 Method for searching fault of optical fiber cable

Country Status (1)

Country Link
JP (1) JPS57120837A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6432731A (en) * 1987-07-29 1989-02-02 Oki Electric Ind Co Ltd System for detecting optical link trouble

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6432731A (en) * 1987-07-29 1989-02-02 Oki Electric Ind Co Ltd System for detecting optical link trouble

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