JPS57111141A - Light emission element driving circuit - Google Patents

Light emission element driving circuit

Info

Publication number
JPS57111141A
JPS57111141A JP55186877A JP18687780A JPS57111141A JP S57111141 A JPS57111141 A JP S57111141A JP 55186877 A JP55186877 A JP 55186877A JP 18687780 A JP18687780 A JP 18687780A JP S57111141 A JPS57111141 A JP S57111141A
Authority
JP
Japan
Prior art keywords
circuit
inputted
light emission
emission element
signal
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
JP55186877A
Other languages
Japanese (ja)
Other versions
JPS6318902B2 (en
Inventor
Yasuhiro Tanaka
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 JP55186877A priority Critical patent/JPS57111141A/en
Publication of JPS57111141A publication Critical patent/JPS57111141A/en
Publication of JPS6318902B2 publication Critical patent/JPS6318902B2/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)
  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To raise reliability of an optical repeater, by constituting so that another light emission element can be operated when a light emission element has been deteriorated. CONSTITUTION:When an input signal is inputted from a teminal 15 and is inputted to the base of a transistor (TR)22 through contacts (a)-(b) of a changeover switch 18, a light emission element 21 is operated and is inputted to a branching circuit 25. A part of optical signal of the circuit 25 is converted to an electric signal by an optical signal/ electric signal converting circuit 23, and its converted output is inputted to a checking circuit 19. When an operation of the element 21 is normal, positive voltage is outputted to an output of the circuit 19, and a changeover switch driving circuit 17 holds a state as it is. If an output of the circuit 23 has become lower than a prescribed value due to deterioration of the element 21, the output of the circuit 19 becomes negative voltage, the circut 17 is operated by its negative voltage, and the switch 18 is changed over to the contacts (a)-(c) from (a)-(b). Subsequently, the input signal is inputted to the base of TR27, and a light emission element 26 is operated. An optical signal of the element 26 passes through a light branching circuit 28, a part of its signal is converted to an electric signal by an optical signal/electric signal converting circuit 24, and is inputted to a checking circuit 20.
JP55186877A 1980-12-26 1980-12-26 Light emission element driving circuit Granted JPS57111141A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55186877A JPS57111141A (en) 1980-12-26 1980-12-26 Light emission element driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55186877A JPS57111141A (en) 1980-12-26 1980-12-26 Light emission element driving circuit

Publications (2)

Publication Number Publication Date
JPS57111141A true JPS57111141A (en) 1982-07-10
JPS6318902B2 JPS6318902B2 (en) 1988-04-20

Family

ID=16196238

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55186877A Granted JPS57111141A (en) 1980-12-26 1980-12-26 Light emission element driving circuit

Country Status (1)

Country Link
JP (1) JPS57111141A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01128703U (en) * 1988-02-23 1989-09-01

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5393702A (en) * 1977-01-27 1978-08-17 Nec Corp Optical transmitter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5393702A (en) * 1977-01-27 1978-08-17 Nec Corp Optical transmitter

Also Published As

Publication number Publication date
JPS6318902B2 (en) 1988-04-20

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