JPS54143003A - Optical transmission unit - Google Patents

Optical transmission unit

Info

Publication number
JPS54143003A
JPS54143003A JP5113578A JP5113578A JPS54143003A JP S54143003 A JPS54143003 A JP S54143003A JP 5113578 A JP5113578 A JP 5113578A JP 5113578 A JP5113578 A JP 5113578A JP S54143003 A JPS54143003 A JP S54143003A
Authority
JP
Japan
Prior art keywords
photo diode
transmission unit
optical transmission
semiconductor laser
current
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
JP5113578A
Other languages
Japanese (ja)
Inventor
Yoshito Ueno
Yoshio Ogushi
Tadao Kobayashi
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon Electric 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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP5113578A priority Critical patent/JPS54143003A/en
Publication of JPS54143003A publication Critical patent/JPS54143003A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • 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)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To make linearity good to make it possible to use an optical transmission unit for a high frequency by improving the trouble of the response of the optical feedback methode, which is a defect conventionally, by negative feedback in the optical transmission unit using a semiconductor laser. CONSTITUTION:Input electric signals are applied to the base of outputting transistor 7 of a driving circuit, and are amplified by the collector earth system, and are applied to semiocnductor laser 2. After being coupled with avalanche photo diode 6 and being converted and amplified to a current, a part of the output light from semiconductor laser 2 is led to semiconductor laser 2 directly. A negative voltage for bias is applied to one side of photo diode 6 and can adjust the multiplication degree of photo diode 6. Then, the current from photo diode 6 is connected in the direction where the output current of transistor 7 is cancelled, so that the loop of semiconductor 2 and photo diode 6 may be a negative feedback loop.
JP5113578A 1978-04-28 1978-04-28 Optical transmission unit Pending JPS54143003A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5113578A JPS54143003A (en) 1978-04-28 1978-04-28 Optical transmission unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5113578A JPS54143003A (en) 1978-04-28 1978-04-28 Optical transmission unit

Publications (1)

Publication Number Publication Date
JPS54143003A true JPS54143003A (en) 1979-11-07

Family

ID=12878366

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5113578A Pending JPS54143003A (en) 1978-04-28 1978-04-28 Optical transmission unit

Country Status (1)

Country Link
JP (1) JPS54143003A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4829713B1 (en) * 1969-10-20 1973-09-12

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4829713B1 (en) * 1969-10-20 1973-09-12

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