JPS6410683A - Apparatus for controlling spectral width of laser - Google Patents

Apparatus for controlling spectral width of laser

Info

Publication number
JPS6410683A
JPS6410683A JP62165280A JP16528087A JPS6410683A JP S6410683 A JPS6410683 A JP S6410683A JP 62165280 A JP62165280 A JP 62165280A JP 16528087 A JP16528087 A JP 16528087A JP S6410683 A JPS6410683 A JP S6410683A
Authority
JP
Japan
Prior art keywords
branches
divided
output
amplifier
circuit
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
JP62165280A
Other languages
Japanese (ja)
Inventor
Kaoru Manome
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
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 filed Critical NEC Corp
Priority to JP62165280A priority Critical patent/JPS6410683A/en
Publication of JPS6410683A publication Critical patent/JPS6410683A/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
    • H01S5/0687—Stabilising the frequency of the laser

Landscapes

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

Abstract

PURPOSE:To keep a minimum spectral line width even if a semiconductor laser used as a light source has a spectral line whose width shows bias dependency, by controlling bias current according to an output of a comparing circuit comparing powers of at least two frequency bands of output from a homodyne-type photodetection circuit. CONSTITUTION:A photodetector 14, together with other components, constitutes a homodyne-type photodetection circuit by which light from an LD 1 is divided into two branches. One of the branches is delayed with respect to the other and then they are synthesized to be detected. The synthesized light 13 is, after converted into electric signals by the photodetector 14, amplified by an amplifier 15. Output of the amplifier is divided into two branches, one of which passes through a lowpass filter 16 and the other passes a band-pass filter 17 and both are inputted to a differential amplifier 18. Output of the amplifier 18 is divided into two branches, one of which is delayed on a delay line 19 while the other is inputted to a differential amplifier 20 to provide an error signal S21. The signal S21 is divided into two, one of which is fed back to a bias circuit 5 of a phase control region 3. Power of the other part of the signal S21 is detected by an envelope detector 22 and is fed back to an oscillator 6.
JP62165280A 1987-07-03 1987-07-03 Apparatus for controlling spectral width of laser Pending JPS6410683A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62165280A JPS6410683A (en) 1987-07-03 1987-07-03 Apparatus for controlling spectral width of laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62165280A JPS6410683A (en) 1987-07-03 1987-07-03 Apparatus for controlling spectral width of laser

Publications (1)

Publication Number Publication Date
JPS6410683A true JPS6410683A (en) 1989-01-13

Family

ID=15809330

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62165280A Pending JPS6410683A (en) 1987-07-03 1987-07-03 Apparatus for controlling spectral width of laser

Country Status (1)

Country Link
JP (1) JPS6410683A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090127233A1 (en) * 2007-11-21 2009-05-21 Disco Corporation Laser beam machining apparatus
JP2009146952A (en) * 2007-12-11 2009-07-02 Opnext Japan Inc Laser device and method of controlling the same
JP2017188596A (en) * 2016-04-07 2017-10-12 三菱電機株式会社 Optical module
CN112654915A (en) * 2018-07-25 2021-04-13 协同微波公司 Optoelectronic oscillator using monolithically integrated multiple quantum well laser and phase modulator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090127233A1 (en) * 2007-11-21 2009-05-21 Disco Corporation Laser beam machining apparatus
JP2009146952A (en) * 2007-12-11 2009-07-02 Opnext Japan Inc Laser device and method of controlling the same
JP2017188596A (en) * 2016-04-07 2017-10-12 三菱電機株式会社 Optical module
CN112654915A (en) * 2018-07-25 2021-04-13 协同微波公司 Optoelectronic oscillator using monolithically integrated multiple quantum well laser and phase modulator
JP2021532409A (en) * 2018-07-25 2021-11-25 シナジー マイクロウェーブ コーポレーションSynergy Microwave Corporation Photoelectron oscillator using monolithically integrated multiple quantum well laser and phase modulator
EP3827307A4 (en) * 2018-07-25 2022-04-27 Synergy Microwave Corporation Optoelectronic oscillator using monolithically integrated multi-quantum well laser and phase modulator
US11848537B2 (en) 2018-07-25 2023-12-19 Synergy Microwave Corporation Optoelectronic oscillator using monolithically integrated multi-quantum well laser and phase modulator
CN112654915B (en) * 2018-07-25 2024-05-28 协同微波公司 Optoelectronic oscillator using monolithically integrated multiple quantum well lasers and phase modulators

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