JPS5773634A - Light pulse tester - Google Patents

Light pulse tester

Info

Publication number
JPS5773634A
JPS5773634A JP15041880A JP15041880A JPS5773634A JP S5773634 A JPS5773634 A JP S5773634A JP 15041880 A JP15041880 A JP 15041880A JP 15041880 A JP15041880 A JP 15041880A JP S5773634 A JPS5773634 A JP S5773634A
Authority
JP
Japan
Prior art keywords
waveform
fiber
output
light
tester
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
JP15041880A
Other languages
Japanese (ja)
Inventor
Tsuneo Horiguchi
Koji Omote
Masamitsu Tokuda
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.)
NTT Inc
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 JP15041880A priority Critical patent/JPS5773634A/en
Publication of JPS5773634A publication Critical patent/JPS5773634A/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
    • G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
    • G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To constitute a tester which has superior sensitivity and position resolution, by detecting the state of a reflected wave by using pulse which have longer width and intervals that the time when light goes and returns through an optical fiber to be measured. CONSTITUTION:A reference pulse generator 1 generates a test waveform A so that the output width tW and interval tC-tW of a light source 2 are greater than the going and returning propagation time tR of a fiber 4 to be tested. The output of the light source 2 is inputted to the fiber 4 through an optical directional coupler 3, which separates and extracts the reflected output light of the fiber to obtain a signal having a waveform C; and the signal is passed through a photodetector 5, an amplifier 6, and a waveform average arithmetic processor 7 to obtain a waveform D from a differentiator D, and the waveform is displayed on a display device 8. Although the waveform D in the figure shows a normal state, the time and size when the waveform changes suddenly are detected to find a fault point and its condition. Consequently, a peak value is still low and average transmitted light power is increased, so that a tester has an improved S/N ration and superior sensitivity and position resolution.
JP15041880A 1980-10-27 1980-10-27 Light pulse tester Pending JPS5773634A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15041880A JPS5773634A (en) 1980-10-27 1980-10-27 Light pulse tester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15041880A JPS5773634A (en) 1980-10-27 1980-10-27 Light pulse tester

Publications (1)

Publication Number Publication Date
JPS5773634A true JPS5773634A (en) 1982-05-08

Family

ID=15496501

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15041880A Pending JPS5773634A (en) 1980-10-27 1980-10-27 Light pulse tester

Country Status (1)

Country Link
JP (1) JPS5773634A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62138552U (en) * 1986-02-22 1987-09-01
JPS62202559A (en) * 1986-02-07 1987-09-07 Fujitsu Ltd Semiconductor device and its manufacture
JP2000171484A (en) * 1998-12-04 2000-06-23 Anritsu Corp Waveform-displaying device and storage medium
JP2016035452A (en) * 2014-07-31 2016-03-17 ツーシックス、インコーポレイテッドＩｉ−Ｖｉ Ｉｎｃｏｒｐｏｒａｔｅｄ Edge propagation type optical time domain reflectometer and its usage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62202559A (en) * 1986-02-07 1987-09-07 Fujitsu Ltd Semiconductor device and its manufacture
JPS62138552U (en) * 1986-02-22 1987-09-01
JP2000171484A (en) * 1998-12-04 2000-06-23 Anritsu Corp Waveform-displaying device and storage medium
JP2016035452A (en) * 2014-07-31 2016-03-17 ツーシックス、インコーポレイテッドＩｉ−Ｖｉ Ｉｎｃｏｒｐｏｒａｔｅｄ Edge propagation type optical time domain reflectometer and its usage

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