JPS57171854A - Laser diode driving circuit - Google Patents

Laser diode driving circuit

Info

Publication number
JPS57171854A
JPS57171854A JP56057673A JP5767381A JPS57171854A JP S57171854 A JPS57171854 A JP S57171854A JP 56057673 A JP56057673 A JP 56057673A JP 5767381 A JP5767381 A JP 5767381A JP S57171854 A JPS57171854 A JP S57171854A
Authority
JP
Japan
Prior art keywords
modulated
laser diode
impedance
driving circuit
wave
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
JP56057673A
Other languages
Japanese (ja)
Other versions
JPS6237575B2 (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 JP56057673A priority Critical patent/JPS57171854A/en
Publication of JPS57171854A publication Critical patent/JPS57171854A/en
Publication of JPS6237575B2 publication Critical patent/JPS6237575B2/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 constitute a laser diode driving circuit which can perform pulse amplitude modulations of optical ouputs. CONSTITUTION:This circuit is provided with two transistors (TR) 10 and 14 whose emitter are connected to each other so as to constitute an unsaturated type current switching circuit, a laser diode 7 connected to the collector of the TR10 through an impedance 9, a modulated wave generator 1 connected to the base of the TR10 through an impedance 2, and an electric current source for wave to be modulated 13 connected to a connected point 3 of the emitters of the TRs 10 and 14 through an impedance 11. From the modulated wave generator 1 a modulate signal of a large amplitude is supplied to the base of the TR10 so that the TRs 10 and 14 may become conductive and nonconductive alternately. and, at the same time, a current signal of a wave to be modulated is supplied to the emitter connecting point 3 from the electric current source for waves to be modulated 13, then, an optical output whose pulse amplitude is modulated is obtained from the laser diode 7 connected to the collector of the TR10.
JP56057673A 1981-04-16 1981-04-16 Laser diode driving circuit Granted JPS57171854A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56057673A JPS57171854A (en) 1981-04-16 1981-04-16 Laser diode driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56057673A JPS57171854A (en) 1981-04-16 1981-04-16 Laser diode driving circuit

Publications (2)

Publication Number Publication Date
JPS57171854A true JPS57171854A (en) 1982-10-22
JPS6237575B2 JPS6237575B2 (en) 1987-08-13

Family

ID=13062429

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56057673A Granted JPS57171854A (en) 1981-04-16 1981-04-16 Laser diode driving circuit

Country Status (1)

Country Link
JP (1) JPS57171854A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4864649A (en) * 1986-08-26 1989-09-05 Nec Corporation Driver circuit for driving a light emitting element by superimposing an analog sub-information signal over a digital main signal
EP0798828A2 (en) * 1996-03-29 1997-10-01 Fujitsu Limited Light emitting element driving circuit and light emitting device having the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4864649A (en) * 1986-08-26 1989-09-05 Nec Corporation Driver circuit for driving a light emitting element by superimposing an analog sub-information signal over a digital main signal
EP0798828A2 (en) * 1996-03-29 1997-10-01 Fujitsu Limited Light emitting element driving circuit and light emitting device having the same
EP0798828A3 (en) * 1996-03-29 1997-12-03 Fujitsu Limited Light emitting element driving circuit and light emitting device having the same
US6031855A (en) * 1996-03-29 2000-02-29 Fujitsu Limited Light emitting element driving circuit and light emitting device having the same

Also Published As

Publication number Publication date
JPS6237575B2 (en) 1987-08-13

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