JPS5579545A - Photo transmitter - Google Patents

Photo transmitter

Info

Publication number
JPS5579545A
JPS5579545A JP15390978A JP15390978A JPS5579545A JP S5579545 A JPS5579545 A JP S5579545A JP 15390978 A JP15390978 A JP 15390978A JP 15390978 A JP15390978 A JP 15390978A JP S5579545 A JPS5579545 A JP S5579545A
Authority
JP
Japan
Prior art keywords
light
lens
lenses
lambda
light emitting
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
JP15390978A
Other languages
Japanese (ja)
Inventor
Toshihiro Koda
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP15390978A priority Critical patent/JPS5579545A/en
Publication of JPS5579545A publication Critical patent/JPS5579545A/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 simplify a transmitter by eliminating the need to equip a circuit which detects the presence of a signal transmitted to a photo detection side and a light emitting source, by supplying great part of light transmitted by the light emitting source and a transmission line to a photo detecting element by using a focusing lens and reflex mirror at the photo detection side. CONSTITUTION:Light from light emitting element 13 driven by transmitter circuit 12 is led to optical fiber 15 by light mixing branch unit 14 and the light transmitted via fiber 15 is led to two focusing lenses 16 and 17. Here, light axes of those lenses 16 and 17 should agree with that of fiber 15 and reflex mirror 18 is provided between lenses 16 and 17 to supply light focused by lenses 16 and 17 to photo detecting element 22. Denoting the length of lens 16 by (lambda), a relation of (n/2+1/4)lambda [(n); natural number] is born and light transmitted to one end surface of lens 16 is transformed into a parallel beam to enable lens 17 to focus the parallel beam. In case that a half mirror is used as reflex mirror 18, the length of lens 16 should be (n/4)lambda [(n); integer].
JP15390978A 1978-12-12 1978-12-12 Photo transmitter Pending JPS5579545A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15390978A JPS5579545A (en) 1978-12-12 1978-12-12 Photo transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15390978A JPS5579545A (en) 1978-12-12 1978-12-12 Photo transmitter

Publications (1)

Publication Number Publication Date
JPS5579545A true JPS5579545A (en) 1980-06-16

Family

ID=15572747

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15390978A Pending JPS5579545A (en) 1978-12-12 1978-12-12 Photo transmitter

Country Status (1)

Country Link
JP (1) JPS5579545A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60217312A (en) * 1984-04-13 1985-10-30 Nippon Telegr & Teleph Corp <Ntt> Optical cable transmission line

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60217312A (en) * 1984-04-13 1985-10-30 Nippon Telegr & Teleph Corp <Ntt> Optical cable transmission line

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