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JPS5779425A - Light base band oscillator using semiconductor laser - Google Patents

Light base band oscillator using semiconductor laser

Info

Publication number
JPS5779425A
JPS5779425A JP55155506A JP15550680A JPS5779425A JP S5779425 A JPS5779425 A JP S5779425A JP 55155506 A JP55155506 A JP 55155506A JP 15550680 A JP15550680 A JP 15550680A JP S5779425 A JPS5779425 A JP S5779425A
Authority
JP
Japan
Prior art keywords
laser
optical fiber
self
fiber
excited oscillation
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.)
Granted
Application number
JP55155506A
Other languages
Japanese (ja)
Other versions
JPS639613B2 (en
Inventor
Masataka Nakazawa
Masamitsu Tokuda
Naoya Uchida
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 JP55155506A priority Critical patent/JPS5779425A/en
Publication of JPS5779425A publication Critical patent/JPS5779425A/en
Publication of JPS639613B2 publication Critical patent/JPS639613B2/ja
Granted 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

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)
  • Light Guides In General And Applications Therefor (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To cause the self-excited oscillation of alight base band and then to measure the length or a faulty point of an optical fiber from the frequency of the above-mentioned self-excited oscillation, by making a laser beam incident to an end of the optical fiber and feeding positively the returned beam back to a semiconductor laser. CONSTITUTION:The DC bias is set for a seminconductor laser 11 through a setting circuit 12 to perform a laser oscillation. The beam sent from the laser 11 is made incident to an end of an optical fiber 14 through a beam splitter 13. The laser beam propagates into the fiber 14, returns by Fresnel reflection, is reflected by the splitter 13 and made incident to a photodetector 15 to be converted into an electric signal. This electric signal passes through a band pass filter 16 and is then amplified by an amplifier 17 to be positively fed back to the laser 11. In this case, the sum of the phase change in the fiber 14 and the phase change of an electric circuit system including the detector 15 though the laser 11 becomes an integer-fold value of the period of the self-excited oscillation.
JP55155506A 1980-11-04 1980-11-04 Light base band oscillator using semiconductor laser Granted JPS5779425A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55155506A JPS5779425A (en) 1980-11-04 1980-11-04 Light base band oscillator using semiconductor laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55155506A JPS5779425A (en) 1980-11-04 1980-11-04 Light base band oscillator using semiconductor laser

Publications (2)

Publication Number Publication Date
JPS5779425A true JPS5779425A (en) 1982-05-18
JPS639613B2 JPS639613B2 (en) 1988-03-01

Family

ID=15607528

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55155506A Granted JPS5779425A (en) 1980-11-04 1980-11-04 Light base band oscillator using semiconductor laser

Country Status (1)

Country Link
JP (1) JPS5779425A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756053A1 (en) * 1996-11-21 1998-05-22 Quantel DEVICE FOR DETECTING DAMAGE IN AN OPTICAL FIBER

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5478156A (en) * 1977-12-05 1979-06-22 Hitachi Ltd Detector of break point of optical fibers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5478156A (en) * 1977-12-05 1979-06-22 Hitachi Ltd Detector of break point of optical fibers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756053A1 (en) * 1996-11-21 1998-05-22 Quantel DEVICE FOR DETECTING DAMAGE IN AN OPTICAL FIBER

Also Published As

Publication number Publication date
JPS639613B2 (en) 1988-03-01

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