GB2011751A - Optical measurements using a semiconductor laser - Google Patents

Optical measurements using a semiconductor laser

Info

Publication number
GB2011751A
GB2011751A GB7847077A GB7847077A GB2011751A GB 2011751 A GB2011751 A GB 2011751A GB 7847077 A GB7847077 A GB 7847077A GB 7847077 A GB7847077 A GB 7847077A GB 2011751 A GB2011751 A GB 2011751A
Authority
GB
United Kingdom
Prior art keywords
semiconductor laser
frequency
point
transmission medium
optical measurements
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.)
Withdrawn
Application number
GB7847077A
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
Publication of GB2011751A publication Critical patent/GB2011751A/en
Withdrawn legal-status Critical Current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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Optics & Photonics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Semiconductor Lasers (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

In order to obtain the distance of a reflecting point in an optical transmission medium such as a break point 13 in an optical fibre 1, use is made of the property that when the beam of a direct current driven semiconductor laser 2 is directed through the medium to the point and is then reflected back into the laser through the transmission medium 1 the result is a frequency modulated beam, the modulation frequency having an inverse relationship with said distance. The fundamental frequency in the frequency modulation may be determined by a spectrum analyzer 5. The transmission medium may be air, the reflecting point being a distant object. <IMAGE>
GB7847077A 1977-12-05 1978-12-04 Optical measurements using a semiconductor laser Withdrawn GB2011751A (en)

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
GB2011751A true GB2011751A (en) 1979-07-11

Family

ID=15374346

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7847077A Withdrawn GB2011751A (en) 1977-12-05 1978-12-04 Optical measurements using a semiconductor laser

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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138623A2 (en) * 1983-10-18 1985-04-24 Nippon Telegraph And Telephone Corporation Test method for optical fibres and apparatus for performing the test method
WO1986000134A1 (en) * 1984-06-13 1986-01-03 Fondazione Ugo Bordoni A method for detecting faults or breaks in optical fiber links
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

Families Citing this family (8)

* 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
JPS5779425A (en) * 1980-11-04 1982-05-18 Nippon Telegr & Teleph Corp <Ntt> Light base band oscillator using semiconductor laser
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
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
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

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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138623A2 (en) * 1983-10-18 1985-04-24 Nippon Telegraph And Telephone Corporation Test method for optical fibres and apparatus for performing the test method
EP0138623A3 (en) * 1983-10-18 1986-01-02 Nippon Telegraph And Telephone Corporation Test method for optical fibres and apparatus for performing the test method
WO1986000134A1 (en) * 1984-06-13 1986-01-03 Fondazione Ugo Bordoni A method for detecting faults or breaks in optical fiber links
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
US7280188B2 (en) 2004-09-03 2007-10-09 Alcatel Method for the reflectometric testing of an optical transmission line, optical device and optical transmission and reception device
CN100434894C (en) * 2004-09-03 2008-11-19 阿尔卡特公司 Method for the reflectometric testing of an optical transmission line, optical device and optical transmission and reception device

Also Published As

Publication number Publication date
DE2852614B2 (en) 1980-01-31
DE2852614A1 (en) 1979-06-07
JPS5478156A (en) 1979-06-22
FR2410815A1 (en) 1979-06-29
NL7811878A (en) 1979-06-07

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)