JPS5790132A - Measuring apparatus for frequency characteristic of fiber - Google Patents

Measuring apparatus for frequency characteristic of fiber

Info

Publication number
JPS5790132A
JPS5790132A JP16646480A JP16646480A JPS5790132A JP S5790132 A JPS5790132 A JP S5790132A JP 16646480 A JP16646480 A JP 16646480A JP 16646480 A JP16646480 A JP 16646480A JP S5790132 A JPS5790132 A JP S5790132A
Authority
JP
Japan
Prior art keywords
signals
frequency
modulation
chopper
light
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
JP16646480A
Other languages
Japanese (ja)
Inventor
Kazuo Yamane
Yasuo Nagai
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16646480A priority Critical patent/JPS5790132A/en
Publication of JPS5790132A publication Critical patent/JPS5790132A/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)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

PURPOSE:To improve measurement sensitivity of frequency characteristics by propagating along optical fibers to photosignals corresponding to the choppered variable frequency signals, and detecting synchronously and dividing these photosignals by chopper frequency signals and their reverse phase signals. CONSTITUTION:Variable frequency modulation signals from a modulation signal generator 1 are applied to a driving circuit 4 via a gate 3 controlled by chopper signals of a certain frequency from a chopper signal generator 2, and an electricity-light convertor 5 is started. Lights corresponding to variable frequency modulation signals and non-modulation signals from this convertor 5 propagate along an optical fiber 6, and are changed to electric signals at a light-electricity converter 7. Then, modulation and non-modulation signals which respond to receive lights with chopper frequency signals through a reverse circuit 10 are detected at synchronization detectors 8 and 9, and processed at a dividing calculator 11. Thus propagation characteristics of the fiber 6 can be determined with good S/N without influence of variable generation of light-outputs and noises. Therefore frequency characteristics can be measured with high sensitivity especially in the high region with a large loss of optical fibers.
JP16646480A 1980-11-25 1980-11-25 Measuring apparatus for frequency characteristic of fiber Pending JPS5790132A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16646480A JPS5790132A (en) 1980-11-25 1980-11-25 Measuring apparatus for frequency characteristic of fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16646480A JPS5790132A (en) 1980-11-25 1980-11-25 Measuring apparatus for frequency characteristic of fiber

Publications (1)

Publication Number Publication Date
JPS5790132A true JPS5790132A (en) 1982-06-04

Family

ID=15831876

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16646480A Pending JPS5790132A (en) 1980-11-25 1980-11-25 Measuring apparatus for frequency characteristic of fiber

Country Status (1)

Country Link
JP (1) JPS5790132A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2369433A (en) * 2000-07-10 2002-05-29 Advantest Corp System to measure optical characteristics

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2369433A (en) * 2000-07-10 2002-05-29 Advantest Corp System to measure optical characteristics
GB2369433B (en) * 2000-07-10 2002-11-13 Advantest Corp Optical characteristic measuring apparatus,the method thereof,and recording medium
US6519028B2 (en) 2000-07-10 2003-02-11 Advantest Corporation Optical characteristic measuring apparatus, the method thereof and recording medium

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