JPS6413782A - Automatic optical output control circuit - Google Patents

Automatic optical output control circuit

Info

Publication number
JPS6413782A
JPS6413782A JP16852687A JP16852687A JPS6413782A JP S6413782 A JPS6413782 A JP S6413782A JP 16852687 A JP16852687 A JP 16852687A JP 16852687 A JP16852687 A JP 16852687A JP S6413782 A JPS6413782 A JP S6413782A
Authority
JP
Japan
Prior art keywords
photodiode
temperature
detecting signal
subtracter
optical output
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
JP16852687A
Other languages
Japanese (ja)
Inventor
Hiroto Iguchi
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 JP16852687A priority Critical patent/JPS6413782A/en
Publication of JPS6413782A publication Critical patent/JPS6413782A/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 keep an optical output constant extending over the whole range of an operating temperature by controlling driving currents for a laser diode LD by a temperature sensor, a memory circuit storing the information of dark currents to the temperature of a P-I-N photodiode and a subtracter. CONSTITUTION:The back beams of an LD 6 are detected by a P-I-N photodiode 5, and a detecting signal 101 is input to a subtracter 4. The components of the back beams of the LD 6 and the dark current compo nents of the P-I-N photodiode 5 are included in the detecting signal 101. A temperature sensor 2 detects the temperature of the P-I-N photodiode 5, and the detecting signal 102 is input to a memory circuit 3. The memory circuit 3 stores the information of dark currents to the temperature of the P-I-N photodiode 5, and outputs a control signal 103 corresponding to the detecting signal 102. The subtracter 4 subtracts the dark current components of the P-I-N photodiode 5 in the detecting signal 101 by the control signal 103, the back beam components of the LD 6 are only left, and an LD driver circuit 1 is controlled by a control signal 104. The LD driver circuit 1 can control LD driving currents only by the back beams of the LD 6.
JP16852687A 1987-07-08 1987-07-08 Automatic optical output control circuit Pending JPS6413782A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16852687A JPS6413782A (en) 1987-07-08 1987-07-08 Automatic optical output control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16852687A JPS6413782A (en) 1987-07-08 1987-07-08 Automatic optical output control circuit

Publications (1)

Publication Number Publication Date
JPS6413782A true JPS6413782A (en) 1989-01-18

Family

ID=15869653

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16852687A Pending JPS6413782A (en) 1987-07-08 1987-07-08 Automatic optical output control circuit

Country Status (1)

Country Link
JP (1) JPS6413782A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002069464A1 (en) * 2001-02-23 2002-09-06 Fujitsu Limited Light transmitter
JP2009004549A (en) * 2007-06-21 2009-01-08 Yokogawa Electric Corp Guide rail for printed circuit board

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002069464A1 (en) * 2001-02-23 2002-09-06 Fujitsu Limited Light transmitter
US6748181B2 (en) 2001-02-23 2004-06-08 Fujitsu Limited Optical transmitter provided with optical output control function
JP2009004549A (en) * 2007-06-21 2009-01-08 Yokogawa Electric Corp Guide rail for printed circuit board

Similar Documents

Publication Publication Date Title
CA2073430A1 (en) Laser control circuit
EP0215311A3 (en) Laser diode driving circuit
CA2174636A1 (en) Temperature-controlled laser sintering
CA2254305A1 (en) A laser module allowing simultaneous wavelength and power control
EP1111745B1 (en) Laser control loop with automatic adaptation to the monitoring signal polarity
JPS6413782A (en) Automatic optical output control circuit
CA2108213A1 (en) Optical Semiconductor Amplifier
CA2157679A1 (en) Rapid turn-on source for fiber optic gyroscope
GB1539624A (en) Laser control system
JPS57169932A (en) Automatic tracking system for optical disc
EP0947942B1 (en) Reading method and reader for an optical code
JPS56158494A (en) Output control device for semiconductor laser
JPH067612B2 (en) Light output stabilizer
JPS54129904A (en) Doubling system of light source
JPS575187A (en) Recorder
JPS56123521A (en) Optical scanner
JP2909675B2 (en) Laser light amount control circuit for optical recording device
JPS6464131A (en) Focus servo circuit for optical disk
JPS5769539A (en) Control device for light focusing position
HK13096A (en) Method of focussing a light beam onto an optical record carrier
JPS6480083A (en) Optical output stabilizing circuit
JPS56153325A (en) Automatic focus controller of camera
JPS6481288A (en) Laser diode control device
SATORU Laser optical system
JPS55140283A (en) Pulse modulator circuit for laser diode