JPS5660084A - Laser driving system - Google Patents

Laser driving system

Info

Publication number
JPS5660084A
JPS5660084A JP13678179A JP13678179A JPS5660084A JP S5660084 A JPS5660084 A JP S5660084A JP 13678179 A JP13678179 A JP 13678179A JP 13678179 A JP13678179 A JP 13678179A JP S5660084 A JPS5660084 A JP S5660084A
Authority
JP
Japan
Prior art keywords
signal
pilot signal
output
laser
amplifier
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
JP13678179A
Other languages
Japanese (ja)
Inventor
Takashi Kihara
Satoshi Ikeuchi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP13678179A priority Critical patent/JPS5660084A/en
Publication of JPS5660084A publication Critical patent/JPS5660084A/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
    • H01S5/06835—Stabilising during pulse modulation or generation

Landscapes

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

Abstract

PURPOSE:To preferably maintain the on to off ratio of the laser driving system even if a laser is deteriorated by superposing a pilot signal to a pulse signal and detecting the output to thereby control the pilot signal together with the pulse signal in response to the value of the pilot signal. CONSTITUTION:A pilot signal f0 as a sinusoidal wave signal of a frequency having twice the frequency of the bit rate of the pulse signal is generated from a pilot signal generator 10. Then, the pilot signal f0 is superposed to the pulse signal at a mixer 9, is then amplified by an amplifier 11 to generate a drive signal F so as to drive the semiconductor laser 2 under control. Subsequently, the part of the light output is branched by a divider 3, and is received by a photodetector 4 which detects the component of the pilot signal f0. The signal is thus amplified by the amplifier 17, and is compared with the output from a signal pulse space factor detector 12. On the other hand, when the semiconductor laser 2 is deteriorated so that the gradient of the output characteristic curve becomes low, the pilot signal from the photodetector 4 also becomes low. Then, the gain of the variable gain amplifier 11 is increased by the output from an operational amplifier 13 to drive the laser 2 so as to maintain the on to off ratio constantly.
JP13678179A 1979-10-23 1979-10-23 Laser driving system Pending JPS5660084A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13678179A JPS5660084A (en) 1979-10-23 1979-10-23 Laser driving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13678179A JPS5660084A (en) 1979-10-23 1979-10-23 Laser driving system

Publications (1)

Publication Number Publication Date
JPS5660084A true JPS5660084A (en) 1981-05-23

Family

ID=15183360

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13678179A Pending JPS5660084A (en) 1979-10-23 1979-10-23 Laser driving system

Country Status (1)

Country Link
JP (1) JPS5660084A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0619643U (en) * 1992-06-08 1994-03-15 弘道 山下 Eating and drinking utensils
JP2010278397A (en) * 2009-06-01 2010-12-09 Nippon Telegr & Teleph Corp <Ntt> Direct-modulation semiconductor laser
JP2010278396A (en) * 2009-06-01 2010-12-09 Nippon Telegr & Teleph Corp <Ntt> Direct-modulation semiconductor laser

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0619643U (en) * 1992-06-08 1994-03-15 弘道 山下 Eating and drinking utensils
JP2010278397A (en) * 2009-06-01 2010-12-09 Nippon Telegr & Teleph Corp <Ntt> Direct-modulation semiconductor laser
JP2010278396A (en) * 2009-06-01 2010-12-09 Nippon Telegr & Teleph Corp <Ntt> Direct-modulation semiconductor laser

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