JPS5678247A - Monitoring circuit for light repeating transmission line - Google Patents

Monitoring circuit for light repeating transmission line

Info

Publication number
JPS5678247A
JPS5678247A JP15483779A JP15483779A JPS5678247A JP S5678247 A JPS5678247 A JP S5678247A JP 15483779 A JP15483779 A JP 15483779A JP 15483779 A JP15483779 A JP 15483779A JP S5678247 A JPS5678247 A JP S5678247A
Authority
JP
Japan
Prior art keywords
light
repeater
circuit
transmission line
monitoring circuit
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
JP15483779A
Other languages
Japanese (ja)
Other versions
JPS6253975B2 (en
Inventor
Kaoru Fukushima
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15483779A priority Critical patent/JPS5678247A/en
Publication of JPS5678247A publication Critical patent/JPS5678247A/en
Publication of JPS6253975B2 publication Critical patent/JPS6253975B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems

Abstract

PURPOSE:To improve the reliability of light signal transmission by preventing a normal repeater from being judged to be a faulty repeater wrongly, by providing up-directional and down-directional shutters between transmittion lines of a light circuit that returns a supervisory signal. CONSTITUTION:Repeater REP1 a light communication system is provided with a light returning circuit for a monitoring over a fault of optical fiber. In this light circuit, avalache photodiode APD1, laser diode LD1, lenses L1-L4, and half- mirrors M1 and M2 are arranged and between lens L2 and mirror M1 returning the supervisory signal, in mirrors M1 and M2, and in mirror M2 and lens L4, shutters S1-S3 are also arranged. Input and output light paths to the light circuit are cut off to prevent a normal repeater from being judged to be faulty one wrongly, so that the reliability of light signal transmission will be improved.
JP15483779A 1979-11-29 1979-11-29 Monitoring circuit for light repeating transmission line Granted JPS5678247A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15483779A JPS5678247A (en) 1979-11-29 1979-11-29 Monitoring circuit for light repeating transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15483779A JPS5678247A (en) 1979-11-29 1979-11-29 Monitoring circuit for light repeating transmission line

Publications (2)

Publication Number Publication Date
JPS5678247A true JPS5678247A (en) 1981-06-27
JPS6253975B2 JPS6253975B2 (en) 1987-11-12

Family

ID=15592956

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15483779A Granted JPS5678247A (en) 1979-11-29 1979-11-29 Monitoring circuit for light repeating transmission line

Country Status (1)

Country Link
JP (1) JPS5678247A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61284357A (en) * 1985-05-20 1986-12-15 マシン　テクノロジ−　インコ−ポレイテツド Method and device for transferring work between cassette
US4660973A (en) * 1982-07-03 1987-04-28 U.S. Philips Corporation Arrangement for locating faults in an optical information transmission system
US4764980A (en) * 1985-01-22 1988-08-16 Kokusai Denshin Denwa Co., Ltd. System for measuring delay time variation in optical fiber digital communication system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4660973A (en) * 1982-07-03 1987-04-28 U.S. Philips Corporation Arrangement for locating faults in an optical information transmission system
US4764980A (en) * 1985-01-22 1988-08-16 Kokusai Denshin Denwa Co., Ltd. System for measuring delay time variation in optical fiber digital communication system
JPS61284357A (en) * 1985-05-20 1986-12-15 マシン　テクノロジ−　インコ−ポレイテツド Method and device for transferring work between cassette

Also Published As

Publication number Publication date
JPS6253975B2 (en) 1987-11-12

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