JPS5582032A - Out-off wavelength measuring method for lp11 mode in optical fiber and measuring unit - Google Patents

Out-off wavelength measuring method for lp11 mode in optical fiber and measuring unit

Info

Publication number
JPS5582032A
JPS5582032A JP15422378A JP15422378A JPS5582032A JP S5582032 A JPS5582032 A JP S5582032A JP 15422378 A JP15422378 A JP 15422378A JP 15422378 A JP15422378 A JP 15422378A JP S5582032 A JPS5582032 A JP S5582032A
Authority
JP
Japan
Prior art keywords
mode
optical fiber
wavelength
measured optical
polarization
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
JP15422378A
Other languages
Japanese (ja)
Inventor
Yasuyuki Kato
Kenichi Kitayama
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 JP15422378A priority Critical patent/JPS5582032A/en
Publication of JPS5582032A publication Critical patent/JPS5582032A/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
    • G01M11/334—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 with light chopping means

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)

Abstract

PURPOSE:To establish the LP11 mode cut-off measuring unit which can measure the true value with high accuracy, by cutting off LP01 mode with direct polarization for the incident light to measured optical fiber and measuring the intensity of LP11 mode. CONSTITUTION:The position of the chopper 3, polarizer 4 and lens 5 is set so that the wavelength variable light from the wave length variable light source 1 can be incident to the measured optical fiber 6. Next, the wavelength of the wavelength variable light source 1 is determined so that the mode propagating the measured optical fiber 6 can be single mode, and the direction of polarization of the polarizer 4 is taken as Y axis. The outgoing light of measured optical fiber 6 remains only LP01 mode and the direction of polarization of the detector 7 is taken as X axis, allowing to cut off LP01 mode. The optical detector 10 can measure the intensity of LP11 mode only. This method can substantially measure true value in comparison with the method using bending.
JP15422378A 1978-12-15 1978-12-15 Out-off wavelength measuring method for lp11 mode in optical fiber and measuring unit Pending JPS5582032A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15422378A JPS5582032A (en) 1978-12-15 1978-12-15 Out-off wavelength measuring method for lp11 mode in optical fiber and measuring unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15422378A JPS5582032A (en) 1978-12-15 1978-12-15 Out-off wavelength measuring method for lp11 mode in optical fiber and measuring unit

Publications (1)

Publication Number Publication Date
JPS5582032A true JPS5582032A (en) 1980-06-20

Family

ID=15579532

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15422378A Pending JPS5582032A (en) 1978-12-15 1978-12-15 Out-off wavelength measuring method for lp11 mode in optical fiber and measuring unit

Country Status (1)

Country Link
JP (1) JPS5582032A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59114432A (en) * 1982-12-14 1984-07-02 クセルト　セントロ・ステュディ・エ・ラボラトリ・テレコミニカチオ−ニ・エッセ・ピ−・ア− Method of measuring cutoff wavelength of primary and higher mode of optical fiber
US4552578A (en) * 1983-05-16 1985-11-12 At&T Bell Laboratories Optical fiber fabrication process comprising determining mode field radius and cut-off wavelength of single mode optical fibers
JPS6162829A (en) * 1984-09-04 1986-03-31 Nippon Telegr & Teleph Corp <Ntt> Method and apparatus for measuring cut-off wavelength of lp11 mode in optical fiber
JPH02118437U (en) * 1989-03-10 1990-09-21

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59114432A (en) * 1982-12-14 1984-07-02 クセルト　セントロ・ステュディ・エ・ラボラトリ・テレコミニカチオ−ニ・エッセ・ピ−・ア− Method of measuring cutoff wavelength of primary and higher mode of optical fiber
US4552578A (en) * 1983-05-16 1985-11-12 At&T Bell Laboratories Optical fiber fabrication process comprising determining mode field radius and cut-off wavelength of single mode optical fibers
JPS6162829A (en) * 1984-09-04 1986-03-31 Nippon Telegr & Teleph Corp <Ntt> Method and apparatus for measuring cut-off wavelength of lp11 mode in optical fiber
JPH02118437U (en) * 1989-03-10 1990-09-21

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