JPS56137126A - Measuring method and device for alpha deviation of optical fiber - Google Patents

Measuring method and device for alpha deviation of optical fiber

Info

Publication number
JPS56137126A
JPS56137126A JP3902680A JP3902680A JPS56137126A JP S56137126 A JPS56137126 A JP S56137126A JP 3902680 A JP3902680 A JP 3902680A JP 3902680 A JP3902680 A JP 3902680A JP S56137126 A JPS56137126 A JP S56137126A
Authority
JP
Japan
Prior art keywords
alpha
deviation
frequency characteristic
periodicity
optical fiber
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
JP3902680A
Other languages
Japanese (ja)
Inventor
Mitsuhiro Tatsuta
Naoya Uchida
Yoshiyuki Aomi
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 JP3902680A priority Critical patent/JPS56137126A/en
Publication of JPS56137126A publication Critical patent/JPS56137126A/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

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 obtain the alpha deviation with high precision, by measuring the frequency characteristic of the optical fiber to detect periodicity of this frequency characteristic. CONSTITUTION:First, the frequency characteristic of the optical fiber is measured by frequency characteristic measuring system 1, and the measured frequency characteristic is displayed or recorded on display part 2. Next, the periodicity peculair to alpha deviation is detected by periodicity detecting part 3. Data of the periodicity detected by detecting part 3 is supplied to data processing part 4, and alpha deviation is calculated there. Since the alpha deviation is inversely proportional to period DELTAf and fiber length L on the basis of the relation of expression 1, a slight alpha deviation such as + or -0.05 is obtained easily if fiber length L is selected properly. In expression 1, N, DELTA, (c), and (alpha-alpha-opt) are the group refractive index, the maximum specific refractive index difference, the light velocity, and the alpha deviation, respectively.
JP3902680A 1980-03-28 1980-03-28 Measuring method and device for alpha deviation of optical fiber Pending JPS56137126A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3902680A JPS56137126A (en) 1980-03-28 1980-03-28 Measuring method and device for alpha deviation of optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3902680A JPS56137126A (en) 1980-03-28 1980-03-28 Measuring method and device for alpha deviation of optical fiber

Publications (1)

Publication Number Publication Date
JPS56137126A true JPS56137126A (en) 1981-10-26

Family

ID=12541589

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3902680A Pending JPS56137126A (en) 1980-03-28 1980-03-28 Measuring method and device for alpha deviation of optical fiber

Country Status (1)

Country Link
JP (1) JPS56137126A (en)

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