JPS54152901A - Light communication unit - Google Patents

Light communication unit

Info

Publication number
JPS54152901A
JPS54152901A JP6265178A JP6265178A JPS54152901A JP S54152901 A JPS54152901 A JP S54152901A JP 6265178 A JP6265178 A JP 6265178A JP 6265178 A JP6265178 A JP 6265178A JP S54152901 A JPS54152901 A JP S54152901A
Authority
JP
Japan
Prior art keywords
communication unit
light communication
limiting circuit
width
reception side
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
JP6265178A
Other languages
Japanese (ja)
Inventor
Katsuhiko Inoue
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
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 Electric Co Ltd filed Critical NEC Corp
Priority to JP6265178A priority Critical patent/JPS54152901A/en
Publication of JPS54152901A publication Critical patent/JPS54152901A/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
    • H04B10/25—Arrangements specific to fibre transmission

Landscapes

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

Abstract

PURPOSE:To increase a S/N ratio by eliminating a waste of received energy, by equipping a light communication unit with a pulse-width limiting circuit which limits pulses to a width needed to operate a receiving FF provided to the reception side. CONSTITUTION:In the light communication unit, photo signals generated by driver circuits 1 and 2 and light emitting elements 3 and 4 are combined by optical fibers 5 and 6, and the photo signals are transmitted through optical fibers 5 and 6 to receiving elements 7 and 8 at the reception side, whose outputs are sent out via level converter circuits 11 and 12. At the transmission side, pulse-width limiting circuit 41 is provided which limits pulses to a width needed to operate FF42 receives the outputs of level converter circuits 11 and 12 at the reception side. This limiting circuit 41 is provided between the 1st and 2nd gate input terminals (a) to (d) for data and clocks, and driver circuits 1 and 2 at the transmission side so as to avoid a waste of received energy, thereby increasing the S/N ratio.
JP6265178A 1978-05-24 1978-05-24 Light communication unit Pending JPS54152901A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6265178A JPS54152901A (en) 1978-05-24 1978-05-24 Light communication unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6265178A JPS54152901A (en) 1978-05-24 1978-05-24 Light communication unit

Publications (1)

Publication Number Publication Date
JPS54152901A true JPS54152901A (en) 1979-12-01

Family

ID=13206432

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6265178A Pending JPS54152901A (en) 1978-05-24 1978-05-24 Light communication unit

Country Status (1)

Country Link
JP (1) JPS54152901A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01229549A (en) * 1988-03-09 1989-09-13 Japan Aviation Electron Ind Ltd Digital signal light transmission system
US4955081A (en) * 1983-01-25 1990-09-04 Canon Kabushiki Kaisha Light communication system
US5060306A (en) * 1989-07-27 1991-10-22 Kabushiki Kaisha Toshiba Optical transmisson system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52108702A (en) * 1976-03-09 1977-09-12 Mitsubishi Electric Corp Code transmission device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52108702A (en) * 1976-03-09 1977-09-12 Mitsubishi Electric Corp Code transmission device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955081A (en) * 1983-01-25 1990-09-04 Canon Kabushiki Kaisha Light communication system
JPH01229549A (en) * 1988-03-09 1989-09-13 Japan Aviation Electron Ind Ltd Digital signal light transmission system
US5060306A (en) * 1989-07-27 1991-10-22 Kabushiki Kaisha Toshiba Optical transmisson system

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