JPS5727084A - Optical transmitter - Google Patents

Optical transmitter

Info

Publication number
JPS5727084A
JPS5727084A JP10127980A JP10127980A JPS5727084A JP S5727084 A JPS5727084 A JP S5727084A JP 10127980 A JP10127980 A JP 10127980A JP 10127980 A JP10127980 A JP 10127980A JP S5727084 A JPS5727084 A JP S5727084A
Authority
JP
Japan
Prior art keywords
transistor
power source
base potential
voltage
potential
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
JP10127980A
Other languages
Japanese (ja)
Inventor
Hiroyuki Fujita
Koichi Oota
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP10127980A priority Critical patent/JPS5727084A/en
Publication of JPS5727084A publication Critical patent/JPS5727084A/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
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)
  • Led Devices (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To prevent deterioration and damage of a semiconductor laser in turning on and off a power source by making the base potential of one transistor higher than the base potential of the other transistor. CONSTITUTION:During the time a power source voltage -VEE, which is applied when the power source is turned on, is low and smaller than a voltage VZ of a Zener diode 5 in the reverse direction, the voltage at a reference voltage terminal A in a first reference voltage generating circuit 1 is about the ground potential due to a resistor R1. The base potential of the first transistor Tr1 is about the ground potential and higher than the base potential of the second transistor Tr2. Therefore the collector current of the first transistor Tr1 is small, and the overcurrent is not flowed in the semiconductor laser 4.
JP10127980A 1980-07-25 1980-07-25 Optical transmitter Pending JPS5727084A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10127980A JPS5727084A (en) 1980-07-25 1980-07-25 Optical transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10127980A JPS5727084A (en) 1980-07-25 1980-07-25 Optical transmitter

Publications (1)

Publication Number Publication Date
JPS5727084A true JPS5727084A (en) 1982-02-13

Family

ID=14296425

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10127980A Pending JPS5727084A (en) 1980-07-25 1980-07-25 Optical transmitter

Country Status (1)

Country Link
JP (1) JPS5727084A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58151081A (en) * 1982-03-04 1983-09-08 Matsushita Electric Ind Co Ltd Laser power source circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58151081A (en) * 1982-03-04 1983-09-08 Matsushita Electric Ind Co Ltd Laser power source circuit

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