JPS5550680A - Light output control system - Google Patents

Light output control system

Info

Publication number
JPS5550680A
JPS5550680A JP12269178A JP12269178A JPS5550680A JP S5550680 A JPS5550680 A JP S5550680A JP 12269178 A JP12269178 A JP 12269178A JP 12269178 A JP12269178 A JP 12269178A JP S5550680 A JPS5550680 A JP S5550680A
Authority
JP
Japan
Prior art keywords
light
light output
transmitter
coupler
drive current
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
JP12269178A
Other languages
Japanese (ja)
Inventor
Yukio Minami
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12269178A priority Critical patent/JPS5550680A/en
Publication of JPS5550680A publication Critical patent/JPS5550680A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To increase the light transmitting distance by a light output control system by connecting the light outputs from two semiconductor laser transmitters via a light coupler to transmit them by monitoring the consolidated light output to impart negative feedback to the laser drive current to thereby maintain the light output constant. CONSTITUTION:A light transmitter consists of two semiconductor laser transmitters 1 and 2, and the outputs therefrom are coupled by a light coupler 3 to one. Then, the light output from the coupler 3 is fed by an optical fiber 4 to a light receiver provided separately. In this configuration, the general light input to the fiber 4 is monitored by a monitor circuit 5 to control negative feedback of the drive current to the transmitters 1 and 2 so that the consalidated light input becomes always constant. Thus, when one transmitter does not feed normal light output, other transmitter receives larger drive current to thereby reduce no light output as a whole but to increase the light transmitting distance. When it is remarkably malfunctioned, it generates an alarm to replace only the faulted light transmitter for new one.
JP12269178A 1978-10-06 1978-10-06 Light output control system Pending JPS5550680A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12269178A JPS5550680A (en) 1978-10-06 1978-10-06 Light output control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12269178A JPS5550680A (en) 1978-10-06 1978-10-06 Light output control system

Publications (1)

Publication Number Publication Date
JPS5550680A true JPS5550680A (en) 1980-04-12

Family

ID=14842224

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12269178A Pending JPS5550680A (en) 1978-10-06 1978-10-06 Light output control system

Country Status (1)

Country Link
JP (1) JPS5550680A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6462038A (en) * 1987-09-01 1989-03-08 Nec Corp Optical amplifying repeater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6462038A (en) * 1987-09-01 1989-03-08 Nec Corp Optical amplifying repeater

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