JPS57152177A - Dc bias circuit for laser diode - Google Patents

Dc bias circuit for laser diode

Info

Publication number
JPS57152177A
JPS57152177A JP3638981A JP3638981A JPS57152177A JP S57152177 A JPS57152177 A JP S57152177A JP 3638981 A JP3638981 A JP 3638981A JP 3638981 A JP3638981 A JP 3638981A JP S57152177 A JPS57152177 A JP S57152177A
Authority
JP
Japan
Prior art keywords
laser diode
output
volts
circuit
voltage
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.)
Granted
Application number
JP3638981A
Other languages
Japanese (ja)
Other versions
JPS6250070B2 (en
Inventor
Kazuo Yamane
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 JP3638981A priority Critical patent/JPS57152177A/en
Publication of JPS57152177A publication Critical patent/JPS57152177A/en
Publication of JPS6250070B2 publication Critical patent/JPS6250070B2/ja
Granted 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
    • H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation

Landscapes

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

Abstract

PURPOSE:To prevent a device from deterioration by a method wherein a bias circuit is serially inserted between a laser diode driving circuit input end and a monitor circuit output end and supplies the laser diode with a bias current only when all power supplies are on. CONSTITUTION:The output from a laser diode D1 is monitored by a light receiving device D2 whose output is next fed back to the D1 driving circuit to change the DC bias current for the laser diode D1. In a circuit for stabilizing a light output, the output electrode of a transistor Tr 3 is provided with a Zener diode 3 with a reverse direction voltage of 5 volts to lower the Tr 3 input by 5 volts, against the transistor Tr 3 power source voltage of -5 volts. Further, the input negative terminal of an inversion amplifier 1 is supplied with a voltage, set by adjusting a potentiometer R12, making up for a voltage drop caused by a diode 3 with the amplifier 1 output normal. This setup causes the D1 bias current to stop when the +5 volt supply is off, preventing emission of an unnecessarily large quantity of light.
JP3638981A 1981-03-13 1981-03-13 Dc bias circuit for laser diode Granted JPS57152177A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3638981A JPS57152177A (en) 1981-03-13 1981-03-13 Dc bias circuit for laser diode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3638981A JPS57152177A (en) 1981-03-13 1981-03-13 Dc bias circuit for laser diode

Publications (2)

Publication Number Publication Date
JPS57152177A true JPS57152177A (en) 1982-09-20
JPS6250070B2 JPS6250070B2 (en) 1987-10-22

Family

ID=12468489

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3638981A Granted JPS57152177A (en) 1981-03-13 1981-03-13 Dc bias circuit for laser diode

Country Status (1)

Country Link
JP (1) JPS57152177A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63119281A (en) * 1986-11-06 1988-05-23 Fujitsu Ltd Semiconductor laser driving circuit
EP0649667A2 (en) * 1993-10-20 1995-04-26 Antonella Aprile Carpenter Quantum energy therapeutic biostimulation method and apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63119281A (en) * 1986-11-06 1988-05-23 Fujitsu Ltd Semiconductor laser driving circuit
EP0649667A2 (en) * 1993-10-20 1995-04-26 Antonella Aprile Carpenter Quantum energy therapeutic biostimulation method and apparatus
EP0649667A3 (en) * 1993-10-20 1995-05-17 Antonella Aprile Carpenter Quantum energy therapeutic biostimulation method and apparatus

Also Published As

Publication number Publication date
JPS6250070B2 (en) 1987-10-22

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