JPS57147291A - Light transmission circuit - Google Patents

Light transmission circuit

Info

Publication number
JPS57147291A
JPS57147291A JP56031200A JP3120081A JPS57147291A JP S57147291 A JPS57147291 A JP S57147291A JP 56031200 A JP56031200 A JP 56031200A JP 3120081 A JP3120081 A JP 3120081A JP S57147291 A JPS57147291 A JP S57147291A
Authority
JP
Japan
Prior art keywords
output
light
circuit
negative feedback
light source
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
JP56031200A
Other languages
Japanese (ja)
Inventor
Takashi Shinoda
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56031200A priority Critical patent/JPS57147291A/en
Publication of JPS57147291A publication Critical patent/JPS57147291A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]

Landscapes

  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To accelerate the response of controls in a light transmission circuit having a semiconductor laser as a light source by providing a control loop for controlling the bias or amplitude of a drive signal of the light source and a control loop for controlling temperature adjusting means for the light source. CONSTITUTION:A signal applied to an input terminal 1 is converted into a current signal via a drive circuit 3, is applied to a semiconductor laser 4 together with the DC current of a bias circuit 2, and an output light is delivered from an output terminal 6 via a light branching circuit 5. The output current of a photodetector 7 for detecting the branched light is detected at its peak or averaged by a processor 8, and is applied to differential amplifiers 9, 11. The output of the amplifier 9 is applied to a bias circuit 2 to form the first negative feedback loop having fast response, the output of the amplifier 11 is applied to a temperature control element 13 thermally coupled to the laser 4, and the second negative feedback loop having higher loop gain than the first negative feedback loop is formed.
JP56031200A 1981-03-06 1981-03-06 Light transmission circuit Pending JPS57147291A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56031200A JPS57147291A (en) 1981-03-06 1981-03-06 Light transmission circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56031200A JPS57147291A (en) 1981-03-06 1981-03-06 Light transmission circuit

Publications (1)

Publication Number Publication Date
JPS57147291A true JPS57147291A (en) 1982-09-11

Family

ID=12324770

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56031200A Pending JPS57147291A (en) 1981-03-06 1981-03-06 Light transmission circuit

Country Status (1)

Country Link
JP (1) JPS57147291A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4583228A (en) * 1983-11-21 1986-04-15 At&T Bell Laboratories Frequency stabilization of lasers
US6407015B1 (en) * 1997-10-06 2002-06-18 Teijin Limited Sheet capable of controlling quantity of passing fluid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4583228A (en) * 1983-11-21 1986-04-15 At&T Bell Laboratories Frequency stabilization of lasers
US6407015B1 (en) * 1997-10-06 2002-06-18 Teijin Limited Sheet capable of controlling quantity of passing fluid

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