JPH02140640A - Backscattering light measuring instrument - Google Patents

Backscattering light measuring instrument

Info

Publication number
JPH02140640A
JPH02140640A JP29413688A JP29413688A JPH02140640A JP H02140640 A JPH02140640 A JP H02140640A JP 29413688 A JP29413688 A JP 29413688A JP 29413688 A JP29413688 A JP 29413688A JP H02140640 A JPH02140640 A JP H02140640A
Authority
JP
Japan
Prior art keywords
set
reflecting mirror
reflecting
optical waveguide
direction
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
JP29413688A
Other versions
JP2726882B2 (en
Inventor
Masaru Kobayashi
Juichi Noda
Kazumasa Takada
Naoya Uchida
Original Assignee
Nippon Telegr & Teleph Corp <Ntt>
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 Telegr & Teleph Corp <Ntt> filed Critical Nippon Telegr & Teleph Corp <Ntt>
Priority to JP29413688A priority Critical patent/JP2726882B2/en
Publication of JPH02140640A publication Critical patent/JPH02140640A/en
Application granted granted Critical
Publication of JP2726882B2 publication Critical patent/JP2726882B2/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/31Testing 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
    • G01M11/3172Reflectometers detecting the back-scattered light in the frequency-domain, e.g. OFDR, FMCW, heterodyne detection

Abstract

PURPOSE:To attain measurement of the backscattering light generated in the inside with regard to an optical waveguide of arbitrary length by providing a total reflection mirror and an angle control part. CONSTITUTION:An emitted light from a light source 1 is divided into two by a fiber type photocoupler 2, and one of them becomes parallel beams by an objective lens 11, reflected by total reflection mirrors 4, 12 - 14 and follows the same path and made incident on the coupler 2 again. Also, the reflecting direction of the reflecting mirror 4 is set to the direction of the reflecting mirror 12, and set so that the reflecting mirror 12 reflects an incident light in the incident direction. In this case, the optical path length of the reflecting mirror 4 and 12 is set to (l), and when both arms of a Michelson interferometer coincide with each other, the refractive index is denoted as (n), and a backscattering light in a position of l/n in an optical waveguide to be measured 3 can be attained. Also, a position of a prism 7 and an angle of the reflecting mirrors 12 - 15 are set by controlling a moving table 10 and angle control parts 16 - 19 from a signal processing part 15. In such a manner, the backscattering light generated in different points in the optical waveguide 3 can be measured.
JP29413688A 1988-11-21 1988-11-21 Back-scattered light measurement device Expired - Fee Related JP2726882B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29413688A JP2726882B2 (en) 1988-11-21 1988-11-21 Back-scattered light measurement device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29413688A JP2726882B2 (en) 1988-11-21 1988-11-21 Back-scattered light measurement device

Publications (2)

Publication Number Publication Date
JPH02140640A true JPH02140640A (en) 1990-05-30
JP2726882B2 JP2726882B2 (en) 1998-03-11

Family

ID=17803773

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29413688A Expired - Fee Related JP2726882B2 (en) 1988-11-21 1988-11-21 Back-scattered light measurement device

Country Status (1)

Country Link
JP (1) JP2726882B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5268739A (en) * 1990-12-04 1993-12-07 Cise S.P.A. Laser apparatus for measuring the velocity of a fluid
EP0669525A2 (en) * 1994-02-25 1995-08-30 France Telecom Interferometrical system for detecting and localising reflective defects of light guide structures
US5500733A (en) * 1992-07-27 1996-03-19 France Telecom Interferometric system for the detection and location of reflecting faults of light-guiding structures
WO1998043069A1 (en) * 1997-03-26 1998-10-01 Kowa Company, Ltd. Optical measuring instrument
WO1998043068A1 (en) * 1997-03-26 1998-10-01 Kowa Company, Ltd. Optical measuring instrument

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5268739A (en) * 1990-12-04 1993-12-07 Cise S.P.A. Laser apparatus for measuring the velocity of a fluid
US5500733A (en) * 1992-07-27 1996-03-19 France Telecom Interferometric system for the detection and location of reflecting faults of light-guiding structures
EP0669525A2 (en) * 1994-02-25 1995-08-30 France Telecom Interferometrical system for detecting and localising reflective defects of light guide structures
FR2716722A1 (en) * 1994-02-25 1995-09-01 France Telecom An interferometric system of detection and localization of reflecting faults of light guiding structures.
EP0669525A3 (en) * 1994-02-25 1995-11-08 France Telecom Interferometrical system for detecting and localising reflective defects of light guide structures.
US5615011A (en) * 1994-02-25 1997-03-25 France Telecom Interferometric system for the detection and location of reflector faults of light-guiding structures
WO1998043069A1 (en) * 1997-03-26 1998-10-01 Kowa Company, Ltd. Optical measuring instrument
WO1998043068A1 (en) * 1997-03-26 1998-10-01 Kowa Company, Ltd. Optical measuring instrument
US6198540B1 (en) 1997-03-26 2001-03-06 Kowa Company, Ltd. Optical coherence tomography have plural reference beams of differing modulations

Also Published As

Publication number Publication date
JP2726882B2 (en) 1998-03-11

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees