JPS57120838A - Method for measuring transmission characteristic of optical fiber cable - Google Patents

Method for measuring transmission characteristic of optical fiber cable

Info

Publication number
JPS57120838A
JPS57120838A JP700181A JP700181A JPS57120838A JP S57120838 A JPS57120838 A JP S57120838A JP 700181 A JP700181 A JP 700181A JP 700181 A JP700181 A JP 700181A JP S57120838 A JPS57120838 A JP S57120838A
Authority
JP
Japan
Prior art keywords
light pulses
light
fiber cable
transmission
optical fiber
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
JP700181A
Other languages
Japanese (ja)
Inventor
Kenji Okada
Kunio Hashimoto
Ikutaro Kobayashi
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 JP700181A priority Critical patent/JPS57120838A/en
Publication of JPS57120838A publication Critical patent/JPS57120838A/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

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 measure transmission characteristics with respect to arbitrary distance by transmitting the light modulated with a repetitive frequency, receiving backward scattered light after lapse of different times since the transmission, extracting the modulating frequency component thereof and comparing these. CONSTITUTION:The light pulses modulated by the signal of a repetitive frequency (f) of a high speed which is extremely short in time as compared to the propagation time of an optical fiber cable OF are transmitted from a transmitter T via a directional coupler DC into a 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, by which the component of said frequency (f) is extracted 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 the specific scattering point is received.
JP700181A 1981-01-20 1981-01-20 Method for measuring transmission characteristic of optical fiber cable Pending JPS57120838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP700181A JPS57120838A (en) 1981-01-20 1981-01-20 Method for measuring transmission characteristic of optical fiber cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP700181A JPS57120838A (en) 1981-01-20 1981-01-20 Method for measuring transmission characteristic of optical fiber cable

Publications (1)

Publication Number Publication Date
JPS57120838A true JPS57120838A (en) 1982-07-28

Family

ID=11653848

Family Applications (1)

Application Number Title Priority Date Filing Date
JP700181A Pending JPS57120838A (en) 1981-01-20 1981-01-20 Method for measuring transmission characteristic of optical fiber cable

Country Status (1)

Country Link
JP (1) JPS57120838A (en)

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