JPS5478156A - Detector of break point of optical fibers - Google Patents

Detector of break point of optical fibers

Info

Publication number
JPS5478156A
JPS5478156A JP14496777A JP14496777A JPS5478156A JP S5478156 A JPS5478156 A JP S5478156A JP 14496777 A JP14496777 A JP 14496777A JP 14496777 A JP14496777 A JP 14496777A JP S5478156 A JPS5478156 A JP S5478156A
Authority
JP
Japan
Prior art keywords
fiber
semiconductor laser
break point
constant current
face
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
JP14496777A
Other languages
Japanese (ja)
Inventor
Ichiro Ikushima
Minoru Maeda
Katsuyuki Nagano
Mitsuo Tanaka
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14496777A priority Critical patent/JPS5478156A/en
Priority to FR7833786A priority patent/FR2410815A1/en
Priority to GB7847077A priority patent/GB2011751A/en
Priority to DE19782852614 priority patent/DE2852614B2/en
Priority to NL7811878A priority patent/NL7811878A/en
Publication of JPS5478156A publication Critical patent/JPS5478156A/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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination

Abstract

PURPOSE: To detect the break points of optical fibers with a simple device by using a semiconductor laser.
CONSTITUTION: A semiconductor laser 2 connected to a constant current source 3, a photo detector 4 and a variable frequency selecting amplifier 5 are subsequently arrayed to the end face of an optical fiber 1. Then, when the output laser lights 2-1, 2-2 being radiated from both end faces of the semiconductor laser 2 which is constant current driven by th constant current source 3 are cast to the input end face of the optical fiber 1 to be measured 1 and the photo detector 4, the output laser light 2-1 is transmitted in the fiber and part thereof is radiated rightword at the end face (break point) and part thereof becomes reflected wave and propagated to the input side in the fiber. This reflected wave enters the active layer of the semiconductor 2 and part thereof is again emitted as the output laser light 2-1. Hence, it assumes the form in which the light output of the semiconductor laser 2 has been modulated. By detecting the output laser light 2-2 with the photo detector 4 and measuring and detecting the frequency, the distance from the fiber input end up to the break point is calculated.
COPYRIGHT: (C)1979,JPO&Japio
JP14496777A 1977-12-05 1977-12-05 Detector of break point of optical fibers Pending JPS5478156A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP14496777A JPS5478156A (en) 1977-12-05 1977-12-05 Detector of break point of optical fibers
FR7833786A FR2410815A1 (en) 1977-12-05 1978-11-30 OPTICAL MEASURING DEVICE USING A SEMICONDUCTOR LASER
GB7847077A GB2011751A (en) 1977-12-05 1978-12-04 Optical measurements using a semiconductor laser
DE19782852614 DE2852614B2 (en) 1977-12-05 1978-12-05 Optical measuring system for determining the position of a light reflection point in an optical transmission medium
NL7811878A NL7811878A (en) 1977-12-05 1978-12-05 OPTICAL MEASUREMENT SYSTEM WITH SEMICONDUCTOR LASER.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14496777A JPS5478156A (en) 1977-12-05 1977-12-05 Detector of break point of optical fibers

Publications (1)

Publication Number Publication Date
JPS5478156A true JPS5478156A (en) 1979-06-22

Family

ID=15374346

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14496777A Pending JPS5478156A (en) 1977-12-05 1977-12-05 Detector of break point of optical fibers

Country Status (5)

Country Link
JP (1) JPS5478156A (en)
DE (1) DE2852614B2 (en)
FR (1) FR2410815A1 (en)
GB (1) GB2011751A (en)
NL (1) NL7811878A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5779425A (en) * 1980-11-04 1982-05-18 Nippon Telegr & Teleph Corp <Ntt> Light base band oscillator using semiconductor laser

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5743486A (en) * 1980-08-13 1982-03-11 Agency Of Ind Science & Technol Semiconductor ring laser device
DE3126356A1 (en) * 1981-07-03 1983-01-20 Siemens AG, 1000 Berlin und 8000 München PROCESS FOR CHECKING OBJECTS
JPS6071934A (en) * 1983-09-29 1985-04-23 Sumitomo Electric Ind Ltd Spot size measuring method of single mode fiber
JPS6086438A (en) * 1983-10-18 1985-05-16 Nippon Telegr & Teleph Corp <Ntt> Method and apparatus for testing optical fiber
US4564756A (en) * 1984-01-06 1986-01-14 International Business Machines Corporation Proximity sensor with a light-emitting diode which simultaneously emits and detects light
IT1179209B (en) * 1984-06-13 1987-09-16 Bordoni Ugo Fondazione METHOD FOR THE DETECTION OF BREAKS IN A FIBER OPTIC CABLE
JPH04274724A (en) * 1991-03-02 1992-09-30 Fujikura Ltd Otdr apparatus
FR2756053B1 (en) * 1996-11-21 1999-01-29 Quantel DEVICE FOR DETECTING DAMAGE IN AN OPTICAL FIBER
FR2769091B1 (en) * 1997-09-30 1999-12-17 Univ Joseph Fourier ACTIVE OPTICAL DETECTOR
EP1632766A1 (en) 2004-09-03 2006-03-08 Alcatel Procedure for testing an optical transmission line by reflectometry, optical device and optical transmission and receiving device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2457930A1 (en) * 1974-12-07 1976-06-10 Licentia Gmbh PROCEDURE FOR FAULT LOCATION IN FIBER FIBER LIGHT CABLES

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5779425A (en) * 1980-11-04 1982-05-18 Nippon Telegr & Teleph Corp <Ntt> Light base band oscillator using semiconductor laser
JPS639613B2 (en) * 1980-11-04 1988-03-01 Nippon Telegraph & Telephone

Also Published As

Publication number Publication date
FR2410815A1 (en) 1979-06-29
GB2011751A (en) 1979-07-11
DE2852614B2 (en) 1980-01-31
NL7811878A (en) 1979-06-07
DE2852614A1 (en) 1979-06-07

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