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JPS6439839A - Semiconductor laser driving circuit - Google Patents

Semiconductor laser driving circuit

Info

Publication number
JPS6439839A
JPS6439839A JP62195245A JP19524587A JPS6439839A JP S6439839 A JPS6439839 A JP S6439839A JP 62195245 A JP62195245 A JP 62195245A JP 19524587 A JP19524587 A JP 19524587A JP S6439839 A JPS6439839 A JP S6439839A
Authority
JP
Japan
Prior art keywords
circuit
average value
semiconductor laser
threshold level
output
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
JP62195245A
Other languages
Japanese (ja)
Inventor
Shigeki Suyama
Hitoshi Uchinao
Fumio Kurihara
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
NEC Engineering Ltd
Original Assignee
NEC Corp
NEC Engineering 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, NEC Engineering Ltd filed Critical NEC Corp
Priority to JP62195245A priority Critical patent/JPS6439839A/en
Publication of JPS6439839A publication Critical patent/JPS6439839A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To automatically execute a duty adjustment of an optical pulse by controlling a threshold level of a discriminating circuit by a result of comparison of an output of an average value detecting circuit. CONSTITUTION:A 1B2B-encoded digital signal which is inputted to a signal input terminal 11 is allowed to pass through a low-pass filter circuit 8 and a discriminating circuit 10 whose threshold level is variable, and by a signal driving circuit 1, a semiconductor laser 2 is allowed to emit a light beam. Subsequently, an output light which is emitted from the semiconductor laser 2 is photodetected by a photodetector 3, and a peak value and an average value are detected by a peak value detecting circuit 6 and an average value detecting circuit 4. Next, in accordance with these detection value, a threshold voltage generating circuit 7 outputs a signal so that the average value goes to, for instance, 1/2 of the peak value, and by its output, the threshold level of the discriminating circuit 10 is controlled. In such a way, the duty of an optical pulse can be adjusted automatically to an optimum value.
JP62195245A 1987-08-06 1987-08-06 Semiconductor laser driving circuit Pending JPS6439839A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62195245A JPS6439839A (en) 1987-08-06 1987-08-06 Semiconductor laser driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62195245A JPS6439839A (en) 1987-08-06 1987-08-06 Semiconductor laser driving circuit

Publications (1)

Publication Number Publication Date
JPS6439839A true JPS6439839A (en) 1989-02-10

Family

ID=16337910

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62195245A Pending JPS6439839A (en) 1987-08-06 1987-08-06 Semiconductor laser driving circuit

Country Status (1)

Country Link
JP (1) JPS6439839A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0465459A2 (en) * 1990-06-29 1992-01-08 Helmut Dipl.-Ing.Dr. Walter Miniature laser for use in human and veterinary medicine
JP2000059317A (en) * 1998-08-04 2000-02-25 Mitsubishi Electric Corp Optical transmitter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0465459A2 (en) * 1990-06-29 1992-01-08 Helmut Dipl.-Ing.Dr. Walter Miniature laser for use in human and veterinary medicine
JP2000059317A (en) * 1998-08-04 2000-02-25 Mitsubishi Electric Corp Optical transmitter

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