JPS5754444A - Optical communication system - Google Patents

Optical communication system

Info

Publication number
JPS5754444A
JPS5754444A JP55129908A JP12990880A JPS5754444A JP S5754444 A JPS5754444 A JP S5754444A JP 55129908 A JP55129908 A JP 55129908A JP 12990880 A JP12990880 A JP 12990880A JP S5754444 A JPS5754444 A JP S5754444A
Authority
JP
Japan
Prior art keywords
light emitting
emitting element
signal
output
optical
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
JP55129908A
Other languages
Japanese (ja)
Inventor
Masayuki Goto
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 JP55129908A priority Critical patent/JPS5754444A/en
Publication of JPS5754444A publication Critical patent/JPS5754444A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To make long the life of light emitting elemets, by controlling an optical output of the light emitting elements according to the loss, in a bidirectional communication system. CONSTITUTION:An optical level incident to a photo detector 6 is discriminated for more or less than an arbitrary optical level by a reception level discrimination circuit 20. The discriminated output is synthesized into a main signal at a light emitting element drive circuit 12 and transmitted to an optical transmission line 14 at a light emitting element 13. The transmitted signal is converted into an electric signal at a photo detector 15 and amplified at an amplifier 16. A discriminating signal synthesized and transmitted to the main signal is detected at a discrimination signal detection circuit 21 from the signal. This discrimination signal controls a light emitting element drive circuit 3, allowing to control so that an optical level incident to the photo detector 6 can be constant by the output of the detector 4. This is the same for the method controlling the light emitting element 13 so that the optical level incident to the photodetector can be constant. Thus, the light emitting output of the light emitting element can remarkably be reduced and life of the light emitting element can be extended.
JP55129908A 1980-09-17 1980-09-17 Optical communication system Pending JPS5754444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55129908A JPS5754444A (en) 1980-09-17 1980-09-17 Optical communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55129908A JPS5754444A (en) 1980-09-17 1980-09-17 Optical communication system

Publications (1)

Publication Number Publication Date
JPS5754444A true JPS5754444A (en) 1982-03-31

Family

ID=15021360

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55129908A Pending JPS5754444A (en) 1980-09-17 1980-09-17 Optical communication system

Country Status (1)

Country Link
JP (1) JPS5754444A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4548730A (en) * 1983-07-05 1985-10-22 Koslow Technologies Corporation Portable self-contained oxygen generator apparatus and method
JPS6112138A (en) * 1984-06-27 1986-01-20 Nec Corp Optical fiber data link
JPH04255124A (en) * 1991-02-07 1992-09-10 Nec Corp Optical output level control system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4548730A (en) * 1983-07-05 1985-10-22 Koslow Technologies Corporation Portable self-contained oxygen generator apparatus and method
JPS6112138A (en) * 1984-06-27 1986-01-20 Nec Corp Optical fiber data link
JPH04255124A (en) * 1991-02-07 1992-09-10 Nec Corp Optical output level control system

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