JPS645085A - Light output control circuit - Google Patents

Light output control circuit

Info

Publication number
JPS645085A
JPS645085A JP16047387A JP16047387A JPS645085A JP S645085 A JPS645085 A JP S645085A JP 16047387 A JP16047387 A JP 16047387A JP 16047387 A JP16047387 A JP 16047387A JP S645085 A JPS645085 A JP S645085A
Authority
JP
Japan
Prior art keywords
output
changed
capacitor
signal
transistor
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
JP16047387A
Other languages
Japanese (ja)
Inventor
Keiichi Imamura
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP16047387A priority Critical patent/JPS645085A/en
Publication of JPS645085A publication Critical patent/JPS645085A/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
    • H01S5/0687—Stabilising the frequency of the laser

Landscapes

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

Abstract

PURPOSE:To cope with a burst signal without preparing a signal other than transmitted data by a method wherein a signal for driving a light emitting device is inputted and integrated and the output of a control means is changed over in accordance with whether the integral exceeds a certain level or not. CONSTITUTION:If a burst signal is given to the base of a transistor Q2, the signal is inputted to an integrating circuit composed of a resistor R4 and a capacitor C1 and the terminal voltage of the capacitor C1 is elevated. If the voltage of the capacitor C1 exceeds a certain value Vre, the positive-phase- sequence output of a comparator IC2 is changed to a high level. The output of an operational amplifier IC4 is also changed and the base potential of a transistor Q1 is elevated and a normal light output waveform can be obtained. When the burst signal vanishes, the charge of the capacitor C1 is discharged and the terminal voltage is declined and the output of the comparator is changed to a low level. The output of the operational amplifier IC4 is also changed in the same way and the base potential of the transistor Q1 is declined and a light output can be sufficiently small.
JP16047387A 1987-06-26 1987-06-26 Light output control circuit Pending JPS645085A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16047387A JPS645085A (en) 1987-06-26 1987-06-26 Light output control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16047387A JPS645085A (en) 1987-06-26 1987-06-26 Light output control circuit

Publications (1)

Publication Number Publication Date
JPS645085A true JPS645085A (en) 1989-01-10

Family

ID=15715715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16047387A Pending JPS645085A (en) 1987-06-26 1987-06-26 Light output control circuit

Country Status (1)

Country Link
JP (1) JPS645085A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5557694A (en) * 1994-03-30 1996-09-17 Alcatel N.V. Method of determining the zero dispersion wavelength of an optical waveguide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5557694A (en) * 1994-03-30 1996-09-17 Alcatel N.V. Method of determining the zero dispersion wavelength of an optical waveguide

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