JPS647678A - Control system of output from laser diode - Google Patents

Control system of output from laser diode

Info

Publication number
JPS647678A
JPS647678A JP16320387A JP16320387A JPS647678A JP S647678 A JPS647678 A JP S647678A JP 16320387 A JP16320387 A JP 16320387A JP 16320387 A JP16320387 A JP 16320387A JP S647678 A JPS647678 A JP S647678A
Authority
JP
Japan
Prior art keywords
laser diode
output
comparison
current
result
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
JP16320387A
Other languages
Japanese (ja)
Inventor
Tomoatsu Imamura
Toshitaka Senma
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP16320387A priority Critical patent/JPS647678A/en
Publication of JPS647678A publication Critical patent/JPS647678A/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

Landscapes

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

Abstract

PURPOSE:To improve control precision in an output controller by a method wherein optical output from a laser diode is detected and compared with a previously set reference signal, and the current corresponding to the result of the comparison and a bias current are superposed and flow through the laser diode. CONSTITUTION:An optical output from a laser diode 8 is compared with a previously set reference signal Vrf, and currents flowing through the laser diode 8 are changed in response to the result of the comparison, thus controlling the optical from the laser diode. In the output control system of such a laser diode, the current Ia corresponding to a said result of comparison and a constant bias current Ib are superposed and flow through the laser diode 8. A resistor R1 is connected between a + power supply and an anode for the laser diode 8, and fixed bias currents Ib are flowed through the laser diode 8 at all times through the resistor R1. The output current Ia corresponding to the result of comparison of a comparator 11 from an LD drive section 16 and a bias current Ib are superposed and flow through the laser diode 8.
JP16320387A 1987-06-30 1987-06-30 Control system of output from laser diode Pending JPS647678A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16320387A JPS647678A (en) 1987-06-30 1987-06-30 Control system of output from laser diode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16320387A JPS647678A (en) 1987-06-30 1987-06-30 Control system of output from laser diode

Publications (1)

Publication Number Publication Date
JPS647678A true JPS647678A (en) 1989-01-11

Family

ID=15769240

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16320387A Pending JPS647678A (en) 1987-06-30 1987-06-30 Control system of output from laser diode

Country Status (1)

Country Link
JP (1) JPS647678A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5041750A (en) * 1989-12-15 1991-08-20 Canon Kabushiki Kaisha Vibration wave driven apparatus
US5229678A (en) * 1989-10-20 1993-07-20 Seiko Epson Corporation Drive control unit for an ultrasonic step motor
US5479380A (en) * 1989-10-20 1995-12-26 Seiko Epson Corporation Ultrasonic motor for driving an analog electronic watch
US5521455A (en) * 1989-10-20 1996-05-28 Seiko Epson Corporation Ultrasonic motor
EP0878882A2 (en) * 1997-05-12 1998-11-18 AT&T Corp. Current control for an analog optical link

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5229678A (en) * 1989-10-20 1993-07-20 Seiko Epson Corporation Drive control unit for an ultrasonic step motor
US5479380A (en) * 1989-10-20 1995-12-26 Seiko Epson Corporation Ultrasonic motor for driving an analog electronic watch
US5521455A (en) * 1989-10-20 1996-05-28 Seiko Epson Corporation Ultrasonic motor
US5041750A (en) * 1989-12-15 1991-08-20 Canon Kabushiki Kaisha Vibration wave driven apparatus
EP0878882A2 (en) * 1997-05-12 1998-11-18 AT&T Corp. Current control for an analog optical link
EP0878882A3 (en) * 1997-05-12 1998-12-09 AT&T Corp. Current control for an analog optical link
US5963570A (en) * 1997-05-12 1999-10-05 At&T Corp. Current control for an analog optical link

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