JPS577534A - Measurement of distribution parameter in refractive index of optical fiber - Google Patents

Measurement of distribution parameter in refractive index of optical fiber

Info

Publication number
JPS577534A
JPS577534A JP8174380A JP8174380A JPS577534A JP S577534 A JPS577534 A JP S577534A JP 8174380 A JP8174380 A JP 8174380A JP 8174380 A JP8174380 A JP 8174380A JP S577534 A JPS577534 A JP S577534A
Authority
JP
Japan
Prior art keywords
refractive index
optical fiber
measurement
fiber
phase difference
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
JP8174380A
Other languages
Japanese (ja)
Inventor
Tadatoshi Tanifuji
Keiichiro Iwasaki
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
Sumitomo Electric Industries Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Sumitomo Electric Industries 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 Nippon Telegraph and Telephone Corp, Sumitomo Electric Industries Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP8174380A priority Critical patent/JPS577534A/en
Publication of JPS577534A publication Critical patent/JPS577534A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

PURPOSE:To enable the measurement of an optical fiber in comparison with the distribution parameter of refractive index at a certain wavelength by utilizing a difference in the velocity of light propagation near the optical axis from that propagating in the perimeter near the boundary between the core and the clad thereof. CONSTITUTION:A laser beam modulated by a sine waveform or the like propagates near the optical axis through a pin hole or the like while propagating in the perimeter near the boundary between the core and the clad through a ring-shaped space filter or the like passing through a fiber 3 to be measured and beam split 5 and then, is separately received and detected with detectors 91 and 92. A phase difference theta of both detction outputs is measured with a phase difference measuring device 10 based on the equation I on the outputs. The phase difference turns positive or negative depending on whether the propagation speed at different parts of an optical fiber is larger or smaller than the distribution parameter of refractive index at a certain wavelength, which permits the measurement of the fiber on the variation with respect to the distribution parmeter of the refractive index as well as the wavelength involved. In the equation, f represents the frequency of a modulated signal, L the length of an optical fiber, lambdai and lambdao optical axes and taui and tauo delayed propagation times in thellight wavelength in the perimeter.
JP8174380A 1980-06-16 1980-06-16 Measurement of distribution parameter in refractive index of optical fiber Pending JPS577534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8174380A JPS577534A (en) 1980-06-16 1980-06-16 Measurement of distribution parameter in refractive index of optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8174380A JPS577534A (en) 1980-06-16 1980-06-16 Measurement of distribution parameter in refractive index of optical fiber

Publications (1)

Publication Number Publication Date
JPS577534A true JPS577534A (en) 1982-01-14

Family

ID=13754913

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8174380A Pending JPS577534A (en) 1980-06-16 1980-06-16 Measurement of distribution parameter in refractive index of optical fiber

Country Status (1)

Country Link
JP (1) JPS577534A (en)

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