JPS5768941A - Optical transmission system - Google Patents

Optical transmission system

Info

Publication number
JPS5768941A
JPS5768941A JP55145455A JP14545580A JPS5768941A JP S5768941 A JPS5768941 A JP S5768941A JP 55145455 A JP55145455 A JP 55145455A JP 14545580 A JP14545580 A JP 14545580A JP S5768941 A JPS5768941 A JP S5768941A
Authority
JP
Japan
Prior art keywords
photo
output
normal
synthesized
lowered
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
JP55145455A
Other languages
Japanese (ja)
Inventor
Takashi Kihara
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 JP55145455A priority Critical patent/JPS5768941A/en
Publication of JPS5768941A publication Critical patent/JPS5768941A/en
Pending 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)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To make the fiber longer in laser diodes, by operating a synthesized optical output by lowering each optical transmission output in the range that it is not lowered by the normal optical output at normal state, in a multiplex photo transmission section using laser diodes. CONSTITUTION:An input signal is branched to photo transmission sections E/01, E/02 and the same photo signal is transmitted. Each photo transmission consists of drive circuits DR1, DR2 and laser diodes LD1, LD2, and photo signal from the LD1, LD2 is synthesized at a photo coupler PC to transmit synthesized photo output. Normally, the LD1, LD2 make transmission with the photo output of 2/3 of the normal photo output and the synthesized photo output is 4/3 times the normal photo output. If the E/01 is infailure, the photooutput is lowered and 1/3 of the normal photo output, an alarm circuit AL1 detects it and control is made so that the E/02 can be restored to the normal photo output. Thus, even if the E/01 is lowered, the synthesized photo output assures the nomal photo output. Normally, since the photo output is lowered, the life of the LD1, LD2 can be made longer.
JP55145455A 1980-10-17 1980-10-17 Optical transmission system Pending JPS5768941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55145455A JPS5768941A (en) 1980-10-17 1980-10-17 Optical transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55145455A JPS5768941A (en) 1980-10-17 1980-10-17 Optical transmission system

Publications (1)

Publication Number Publication Date
JPS5768941A true JPS5768941A (en) 1982-04-27

Family

ID=15385620

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55145455A Pending JPS5768941A (en) 1980-10-17 1980-10-17 Optical transmission system

Country Status (1)

Country Link
JP (1) JPS5768941A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394725A2 (en) * 1989-04-28 1990-10-31 Siemens Aktiengesellschaft Clock distribution device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394725A2 (en) * 1989-04-28 1990-10-31 Siemens Aktiengesellschaft Clock distribution device

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