JPS567489A - System for controlling photo-output - Google Patents

System for controlling photo-output

Info

Publication number
JPS567489A
JPS567489A JP8256579A JP8256579A JPS567489A JP S567489 A JPS567489 A JP S567489A JP 8256579 A JP8256579 A JP 8256579A JP 8256579 A JP8256579 A JP 8256579A JP S567489 A JPS567489 A JP S567489A
Authority
JP
Japan
Prior art keywords
output
photo
input
reference voltage
ratio
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
JP8256579A
Other languages
Japanese (ja)
Inventor
Yasuhiro Tanaka
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 JP8256579A priority Critical patent/JPS567489A/en
Publication of JPS567489A publication Critical patent/JPS567489A/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

Abstract

PURPOSE:To reduce the photo-output error regardless of the magnitude of the mark ratio of the data input signal and that of the reference voltage by controlling the loop system so that the ratio between the voltage corresponding to the photo-output and the reference voltage corresponding to the electric signal input becomes constant. CONSTITUTION:An electric input is applied to a driving circuit 1, and a laser 2 is driven by means of the photo-output of the driving circuit 1 to generate a photo- output. A part of the photo-output is derived by a mirror 3 or the like and it is converted into an electric signal by means of a PIN diode 4 and an output voltage V0 is added to one input terminal of a dividing circuit 10 through an amplifier 5. A DC reference voltage Vs from a resistor R and a capacitor C corresponding to an electric input is added to the other input terminal of a dividing circuit 10, and division with the output voltage Vo corresponding to the photo-output is carried out in the division circuit 10. The thus divided output V1 is compared with a reference value V in a comparator 11. The driving circuit 1 is controlled so that the ratio of the comparison results becomes constant, and the photo-output error is reduced in spite of the magnitude of the mark ratio of the input signal and that of the reference voltage Vs.
JP8256579A 1979-07-02 1979-07-02 System for controlling photo-output Pending JPS567489A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8256579A JPS567489A (en) 1979-07-02 1979-07-02 System for controlling photo-output

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8256579A JPS567489A (en) 1979-07-02 1979-07-02 System for controlling photo-output

Publications (1)

Publication Number Publication Date
JPS567489A true JPS567489A (en) 1981-01-26

Family

ID=13778002

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8256579A Pending JPS567489A (en) 1979-07-02 1979-07-02 System for controlling photo-output

Country Status (1)

Country Link
JP (1) JPS567489A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57155789A (en) * 1981-03-20 1982-09-25 Mitsubishi Electric Corp Semiconductor laser modulator
US4849980A (en) * 1986-12-29 1989-07-18 Fuji Photo Film Co., Ltd. Laser beam recording method and apparatus
US4862466A (en) * 1986-09-25 1989-08-29 Minolta Camera Kabushiki Kaisha Laser emitting apparatus with temperature intensity control
US5666804A (en) * 1993-03-29 1997-09-16 Mitsubishi Denki Kabushiki Kaisha Secondary air supplying apparatus for internal combustion engine and air heating apparatus thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57155789A (en) * 1981-03-20 1982-09-25 Mitsubishi Electric Corp Semiconductor laser modulator
US4862466A (en) * 1986-09-25 1989-08-29 Minolta Camera Kabushiki Kaisha Laser emitting apparatus with temperature intensity control
US4849980A (en) * 1986-12-29 1989-07-18 Fuji Photo Film Co., Ltd. Laser beam recording method and apparatus
US5666804A (en) * 1993-03-29 1997-09-16 Mitsubishi Denki Kabushiki Kaisha Secondary air supplying apparatus for internal combustion engine and air heating apparatus thereof

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