JPS57122341A - Fault point monitoring system for optical fiber - Google Patents

Fault point monitoring system for optical fiber

Info

Publication number
JPS57122341A
JPS57122341A JP851181A JP851181A JPS57122341A JP S57122341 A JPS57122341 A JP S57122341A JP 851181 A JP851181 A JP 851181A JP 851181 A JP851181 A JP 851181A JP S57122341 A JPS57122341 A JP S57122341A
Authority
JP
Japan
Prior art keywords
signal
optical
terminal station
wavelength
discontinuance
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
JP851181A
Other languages
Japanese (ja)
Inventor
Masami Kato
Takeshi Ito
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 JP851181A priority Critical patent/JPS57122341A/en
Publication of JPS57122341A publication Critical patent/JPS57122341A/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
    • G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
    • G01M11/333—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face using modulated input signals
    • 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
    • G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
    • G01M11/335—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face using two or more input wavelengths

Abstract

PURPOSE:To make it possible to detect the range to the point of breakdown by an on line real time method, by sending optical signals having different wavelength from one terminal station into one optical fiber with the wavelength being multiplexed, and measuring the time difference of signal discontinuance at the other terminal station. CONSTITUTION:The main signal or the breakdown point searching signal from the terminal 3 in the terminal station 1 is supplied to a long wavelength optical transmitter 4 and to a short wavelength optical transmitter 5 as a modulating wave, respectively. Each modulated optical output is inputted to the optical cable 14 through a wave combiner 6. In the terminal station 2, the arriving light from the cable 14 is divided into the long wavelength signal and the short wavelength signal by a wave divider 7 and both signals are given to receivers 8 and 9. The time of discontinuance of the light is measured by measuring parts 10 and 13 based on the discontinuance information of the optical signal of each receiver. Based on the time difference, the range to the breakdown point in the cable is computed by a computing part 11 and displayed on a display part 12.
JP851181A 1981-01-21 1981-01-21 Fault point monitoring system for optical fiber Pending JPS57122341A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP851181A JPS57122341A (en) 1981-01-21 1981-01-21 Fault point monitoring system for optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP851181A JPS57122341A (en) 1981-01-21 1981-01-21 Fault point monitoring system for optical fiber

Publications (1)

Publication Number Publication Date
JPS57122341A true JPS57122341A (en) 1982-07-30

Family

ID=11695145

Family Applications (1)

Application Number Title Priority Date Filing Date
JP851181A Pending JPS57122341A (en) 1981-01-21 1981-01-21 Fault point monitoring system for optical fiber

Country Status (1)

Country Link
JP (1) JPS57122341A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0751386A2 (en) * 1992-04-10 1997-01-02 Norscan Instruments, Ltd. A fibre optic cable monitoring system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0751386A2 (en) * 1992-04-10 1997-01-02 Norscan Instruments, Ltd. A fibre optic cable monitoring system
EP0751386A3 (en) * 1992-04-10 1997-01-08 Norscan Instruments, Ltd. A fibre optic cable monitoring system

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