JPS57203349A - Laser diode driving circuit - Google Patents

Laser diode driving circuit

Info

Publication number
JPS57203349A
JPS57203349A JP56088683A JP8868381A JPS57203349A JP S57203349 A JPS57203349 A JP S57203349A JP 56088683 A JP56088683 A JP 56088683A JP 8868381 A JP8868381 A JP 8868381A JP S57203349 A JPS57203349 A JP S57203349A
Authority
JP
Japan
Prior art keywords
signal
pulse
modulated
modulation
laser diode
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.)
Granted
Application number
JP56088683A
Other languages
Japanese (ja)
Other versions
JPS625541B2 (en
Inventor
Keijiro Nishimura
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 JP56088683A priority Critical patent/JPS57203349A/en
Publication of JPS57203349A publication Critical patent/JPS57203349A/en
Publication of JPS625541B2 publication Critical patent/JPS625541B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To lower the coherency of an output beam and to reduce the distortion and the noise caused by the reflected light, by giving the modulation of the pulse duration to a signal to be modulated, detecting an optical signal responding to the output of the modulation to convert it into an electric signal and then demodulating the output to feed it negatively back to a modulating part. CONSTITUTION:A modulated wave signal 18 given from a modulated wave oscillator 16 is amplified by an amplifier 9 and fed to a pulse amplitude modulating circuit 8 via an input terminal 7. The signal 18 receives the pulse modulation with a pulse modulating signal 17 given from a modulated signal oscillator 15 having a frequency twice or more as much as that of the signal 18. The signal 18 is then converted into an optical signal by a laser diode 1. A part of the optical signal is detected by a photodiode 2 and converted into an electric signal 19 with the modulated wave component 20 demodulated by a demodulator 13. The signal 19 is fed back to an input terminal 12 of the amplifier 9 via a feedback circuit 14.
JP56088683A 1981-06-09 1981-06-09 Laser diode driving circuit Granted JPS57203349A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56088683A JPS57203349A (en) 1981-06-09 1981-06-09 Laser diode driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56088683A JPS57203349A (en) 1981-06-09 1981-06-09 Laser diode driving circuit

Publications (2)

Publication Number Publication Date
JPS57203349A true JPS57203349A (en) 1982-12-13
JPS625541B2 JPS625541B2 (en) 1987-02-05

Family

ID=13949624

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56088683A Granted JPS57203349A (en) 1981-06-09 1981-06-09 Laser diode driving circuit

Country Status (1)

Country Link
JP (1) JPS57203349A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52140201A (en) * 1976-05-19 1977-11-22 Hitachi Ltd Light signal transmission system
JPS5623047A (en) * 1979-08-03 1981-03-04 Nec Corp Optical transmitter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52140201A (en) * 1976-05-19 1977-11-22 Hitachi Ltd Light signal transmission system
JPS5623047A (en) * 1979-08-03 1981-03-04 Nec Corp Optical transmitter

Also Published As

Publication number Publication date
JPS625541B2 (en) 1987-02-05

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