JPS557652A - Mode dispersion measuring unit by optical fiber - Google Patents

Mode dispersion measuring unit by optical fiber

Info

Publication number
JPS557652A
JPS557652A JP8062778A JP8062778A JPS557652A JP S557652 A JPS557652 A JP S557652A JP 8062778 A JP8062778 A JP 8062778A JP 8062778 A JP8062778 A JP 8062778A JP S557652 A JPS557652 A JP S557652A
Authority
JP
Japan
Prior art keywords
mode
signal
phase difference
frequency
measurement
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
JP8062778A
Other languages
Japanese (ja)
Other versions
JPS5650212B2 (en
Inventor
Akira Sugimura
Kazuhiro Oguro
Nobuyuki Imoto
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 JP8062778A priority Critical patent/JPS557652A/en
Publication of JPS557652A publication Critical patent/JPS557652A/en
Publication of JPS5650212B2 publication Critical patent/JPS5650212B2/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
    • G01M11/33—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
    • G01M11/338—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 by measuring dispersion other than PMD, e.g. chromatic dispersion
    • 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)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Dispersion Chemistry (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

PURPOSE:To increase the accuracy for mode dispersion measurement, by modulating laser light with a simple frequency and obtaining the difference of group every mode with the phase difference. CONSTITUTION:The laser light 1 modulated 2 in the frequency f of the oscillator 9 is incident to the optical fiber 4 of the test piece via the mode filter 3 to excite it with the specific mode. The emitted light of the fiber 4 is detected 6 via the mode analyzer 5 and becomes the signal frequency signal in frequency f via the signal processing circuit 7. This signal and the signal from the oscillator 9 are inputted to the phase difference detector 8 to measure the phase difference. Next, the filter 3 is moved to change the oscillation mode of the fiber 4, then the signal receives a delay with the mode dispersion and the phase difference measured before is changed. The dispersion can be obtained by the measurement of the changed component. Thus, the resolution in the dispersion measurement can be increased to increase the accuracy of measurement.
JP8062778A 1978-07-03 1978-07-03 Mode dispersion measuring unit by optical fiber Granted JPS557652A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8062778A JPS557652A (en) 1978-07-03 1978-07-03 Mode dispersion measuring unit by optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8062778A JPS557652A (en) 1978-07-03 1978-07-03 Mode dispersion measuring unit by optical fiber

Publications (2)

Publication Number Publication Date
JPS557652A true JPS557652A (en) 1980-01-19
JPS5650212B2 JPS5650212B2 (en) 1981-11-27

Family

ID=13723583

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8062778A Granted JPS557652A (en) 1978-07-03 1978-07-03 Mode dispersion measuring unit by optical fiber

Country Status (1)

Country Link
JP (1) JPS557652A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0168114A2 (en) * 1984-07-12 1986-01-15 Philips Patentverwaltung GmbH Method of and device for measuring the attenuation in beam waveguides
JP2008093804A (en) * 2006-10-13 2008-04-24 Yunika Kk Cylindrical drilling tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0168114A2 (en) * 1984-07-12 1986-01-15 Philips Patentverwaltung GmbH Method of and device for measuring the attenuation in beam waveguides
JP2008093804A (en) * 2006-10-13 2008-04-24 Yunika Kk Cylindrical drilling tool

Also Published As

Publication number Publication date
JPS5650212B2 (en) 1981-11-27

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