JPS6441288A - Laser diode driving device - Google Patents

Laser diode driving device

Info

Publication number
JPS6441288A
JPS6441288A JP19775887A JP19775887A JPS6441288A JP S6441288 A JPS6441288 A JP S6441288A JP 19775887 A JP19775887 A JP 19775887A JP 19775887 A JP19775887 A JP 19775887A JP S6441288 A JPS6441288 A JP S6441288A
Authority
JP
Japan
Prior art keywords
circuit
output
laser diode
voltage
capacitor
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
JP19775887A
Other languages
Japanese (ja)
Inventor
Keiichi Hoshi
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 JP19775887A priority Critical patent/JPS6441288A/en
Publication of JPS6441288A publication Critical patent/JPS6441288A/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
    • H01S5/06825—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 protect a laser diode from an overcurrent of a control current, by returning an output voltage to a current control circuit and making the input to the current control circuit identified with a charging speed and a voltage of a resistor/capacitor. CONSTITUTION:When a power source switch 5 is turned ON to supply a dc power source 4, a reference voltage circuit 6 is connected to generate a reference voltage from a circuit 6. Charge of a capacitor 8 is started through a resistor 7 by this reference voltage. An output of an operational amplifier 10 in a buffer circuit 9 is connected with a base of a controlling transistor 11 and it is inputted to a current control circuit 3, with the emitter serving as its output. An output of the circuit 3 is returned to an inversion input of the amplifier 10. Then the input of the circuit 3 is raised to be identified with a charging speed and a voltage of the capacitor 8. Hence, a laser diode 1 is protected from an overcurrent of the control current 14.
JP19775887A 1987-08-07 1987-08-07 Laser diode driving device Pending JPS6441288A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19775887A JPS6441288A (en) 1987-08-07 1987-08-07 Laser diode driving device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19775887A JPS6441288A (en) 1987-08-07 1987-08-07 Laser diode driving device

Publications (1)

Publication Number Publication Date
JPS6441288A true JPS6441288A (en) 1989-02-13

Family

ID=16379858

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19775887A Pending JPS6441288A (en) 1987-08-07 1987-08-07 Laser diode driving device

Country Status (1)

Country Link
JP (1) JPS6441288A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004363597A (en) * 2003-06-02 2004-12-24 Samsung Electronics Co Ltd Laser diode protective circuit
WO2005093916A1 (en) * 2004-03-29 2005-10-06 Rohm Co., Ltd Laser element driving apparatus
KR100707235B1 (en) * 2001-02-19 2007-04-13 비오씨 에드워즈 가부시키가이샤 Magnetic bearing type vacuum pump

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100707235B1 (en) * 2001-02-19 2007-04-13 비오씨 에드워즈 가부시키가이샤 Magnetic bearing type vacuum pump
JP2004363597A (en) * 2003-06-02 2004-12-24 Samsung Electronics Co Ltd Laser diode protective circuit
WO2005093916A1 (en) * 2004-03-29 2005-10-06 Rohm Co., Ltd Laser element driving apparatus

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