JPS5676027A - Faulty point detection system for optical fiber - Google Patents

Faulty point detection system for optical fiber

Info

Publication number
JPS5676027A
JPS5676027A JP15311679A JP15311679A JPS5676027A JP S5676027 A JPS5676027 A JP S5676027A JP 15311679 A JP15311679 A JP 15311679A JP 15311679 A JP15311679 A JP 15311679A JP S5676027 A JPS5676027 A JP S5676027A
Authority
JP
Japan
Prior art keywords
converter
pulse
delay circuit
optical fiber
delay
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
JP15311679A
Other languages
Japanese (ja)
Inventor
Eizo Miyauchi
Tomoyuki Otsuka
Hironori Kawaguchi
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 JP15311679A priority Critical patent/JPS5676027A/en
Publication of JPS5676027A publication Critical patent/JPS5676027A/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)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

PURPOSE:To enable a highly accurate detection without using a high speed AD converter by a method wherein a pulse light is sent to an optical fiber with a given interval through a delay circuit wherein a delay time can be controlled and a reflection wave is measured sequentially by a different sampling time through a sample hold AD converter by means of a delay output of a delay circuit. CONSTITUTION:A trigger pulse TB is outputted from a programmable delay circuit 12 with an interval of 100mus to a pulse generator 13 based on a command of an MPU 1 and a pulse having a pulse width of 5ns is outputted from a laser oscillator 14 to an optical-fiber 15. A reflection wave is detected through a mirror 16 and a light detector 15 and its output passes through an amplifier 18 and is given to a sample hold AD converter 19. The AD converter 19 performs a sampling by means of a trigger pulse TD which is generated from the delay circuit 12 delaying by every 5ns and the results thereof are stored in a memory 20. Accordingly, without using a high speed AD converter, a faulty point position detection in high accuracy of 1m or more can be performed.
JP15311679A 1979-11-27 1979-11-27 Faulty point detection system for optical fiber Pending JPS5676027A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15311679A JPS5676027A (en) 1979-11-27 1979-11-27 Faulty point detection system for optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15311679A JPS5676027A (en) 1979-11-27 1979-11-27 Faulty point detection system for optical fiber

Publications (1)

Publication Number Publication Date
JPS5676027A true JPS5676027A (en) 1981-06-23

Family

ID=15555312

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15311679A Pending JPS5676027A (en) 1979-11-27 1979-11-27 Faulty point detection system for optical fiber

Country Status (1)

Country Link
JP (1) JPS5676027A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6177737A (en) * 1984-09-25 1986-04-21 Nippon Telegr & Teleph Corp <Ntt> Optical pulse tester
EP0424643A2 (en) * 1989-10-24 1991-05-02 British Aerospace Public Limited Company Apparatus and methods for testing optical communications networks

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53115252A (en) * 1977-03-18 1978-10-07 Nec Corp Optical fiber fault detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53115252A (en) * 1977-03-18 1978-10-07 Nec Corp Optical fiber fault detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6177737A (en) * 1984-09-25 1986-04-21 Nippon Telegr & Teleph Corp <Ntt> Optical pulse tester
EP0424643A2 (en) * 1989-10-24 1991-05-02 British Aerospace Public Limited Company Apparatus and methods for testing optical communications networks

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