JPS5612790A - Automatic output control system - Google Patents

Automatic output control system

Info

Publication number
JPS5612790A
JPS5612790A JP8706279A JP8706279A JPS5612790A JP S5612790 A JPS5612790 A JP S5612790A JP 8706279 A JP8706279 A JP 8706279A JP 8706279 A JP8706279 A JP 8706279A JP S5612790 A JPS5612790 A JP S5612790A
Authority
JP
Japan
Prior art keywords
semiconductor laser
output
light output
mean value
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.)
Pending
Application number
JP8706279A
Other languages
Japanese (ja)
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 JP8706279A priority Critical patent/JPS5612790A/en
Publication of JPS5612790A publication Critical patent/JPS5612790A/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
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H01S5/06832—Stabilising during amplitude modulation

Landscapes

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

Abstract

PURPOSE:To prevent the occurrence of misdiscrimination at the receiving side of a light signal in spite of a change in temperature by controlling a semiconductor laser to keep an extinction ratio constant. CONSTITUTION:A light output 3 in a semiconductor laser 2 is monitored to convert the output into an electric signal. A mean value of the light output 3 is obtained by passing the signal through a low-pass filter 4 and the mean value and a reference voltage are compared by a comparator 5. A driving current applied to the semiconductor laser 2 from a driving circuit 1 is controlled by the comparison output so that the mean value of the light output 3 may be constant. A signal component cut DC by a capacitor C1 is also compared with a reference voltage by a comparator 6 and the driving current applied to the semiconductor laser 2 from the driving circuit 1 is controlled by the comparison output so that the amplitude of the light output may be constant.
JP8706279A 1979-07-10 1979-07-10 Automatic output control system Pending JPS5612790A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8706279A JPS5612790A (en) 1979-07-10 1979-07-10 Automatic output control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8706279A JPS5612790A (en) 1979-07-10 1979-07-10 Automatic output control system

Publications (1)

Publication Number Publication Date
JPS5612790A true JPS5612790A (en) 1981-02-07

Family

ID=13904444

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8706279A Pending JPS5612790A (en) 1979-07-10 1979-07-10 Automatic output control system

Country Status (1)

Country Link
JP (1) JPS5612790A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997001202A1 (en) * 1995-06-23 1997-01-09 British Telecommunications Public Limited Company Laser drive circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997001202A1 (en) * 1995-06-23 1997-01-09 British Telecommunications Public Limited Company Laser drive circuit

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