JPS57185739A - Spare light source circuit - Google Patents

Spare light source circuit

Info

Publication number
JPS57185739A
JPS57185739A JP56069420A JP6942081A JPS57185739A JP S57185739 A JPS57185739 A JP S57185739A JP 56069420 A JP56069420 A JP 56069420A JP 6942081 A JP6942081 A JP 6942081A JP S57185739 A JPS57185739 A JP S57185739A
Authority
JP
Japan
Prior art keywords
optical fiber
laser
light source
outputs
difference
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
JP56069420A
Other languages
Japanese (ja)
Other versions
JPS6142974B2 (en
Inventor
Kiyobumi Mochizuki
Yasuhiko Niino
Hiroharu Wakabayashi
Yoshitaka Namihira
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to JP56069420A priority Critical patent/JPS57185739A/en
Publication of JPS57185739A publication Critical patent/JPS57185739A/en
Publication of JPS6142974B2 publication Critical patent/JPS6142974B2/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
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To avoid the increase in code error rate taken place at switching of a light source, by providing a delay circuit having a delay amount equal to the difference between transmission time during optical fiber transmission due to the difference of wavelengths of the light sources. CONSTITUTION:Outputs of a semiconductor laser 1 at present use and a semiconductor laser 2 for spare are led to a coupler 3 with optical fibers 13 and 14 and the outputs are transmitted to the photodetector side. If the output of the laser 2 is transmitted faster than that of the laser 1 in the optical fiber, an optical delay circuit 12 is inserted in the optical fiber 14. Thus, at the photodetector since the pulses from the lasers 1 and 2 reach at the same time, the production of code errors due to distorted waveform can be avoided.
JP56069420A 1981-05-11 1981-05-11 Spare light source circuit Granted JPS57185739A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56069420A JPS57185739A (en) 1981-05-11 1981-05-11 Spare light source circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56069420A JPS57185739A (en) 1981-05-11 1981-05-11 Spare light source circuit

Publications (2)

Publication Number Publication Date
JPS57185739A true JPS57185739A (en) 1982-11-16
JPS6142974B2 JPS6142974B2 (en) 1986-09-25

Family

ID=13402098

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56069420A Granted JPS57185739A (en) 1981-05-11 1981-05-11 Spare light source circuit

Country Status (1)

Country Link
JP (1) JPS57185739A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62113108A (en) * 1985-11-13 1987-05-25 Furukawa Electric Co Ltd:The Uninterrupted changing method for optical line
JP2010154064A (en) * 2008-12-24 2010-07-08 Nippon Telegr & Teleph Corp <Ntt> Optical transmission system and optical transmission method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62113108A (en) * 1985-11-13 1987-05-25 Furukawa Electric Co Ltd:The Uninterrupted changing method for optical line
JP2010154064A (en) * 2008-12-24 2010-07-08 Nippon Telegr & Teleph Corp <Ntt> Optical transmission system and optical transmission method

Also Published As

Publication number Publication date
JPS6142974B2 (en) 1986-09-25

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Doyle et al. Design and Operation of a Stable Attenuation Measurement System.