JPS5471904A - Optical communication unit - Google Patents

Optical communication unit

Info

Publication number
JPS5471904A
JPS5471904A JP13937177A JP13937177A JPS5471904A JP S5471904 A JPS5471904 A JP S5471904A JP 13937177 A JP13937177 A JP 13937177A JP 13937177 A JP13937177 A JP 13937177A JP S5471904 A JPS5471904 A JP S5471904A
Authority
JP
Japan
Prior art keywords
photo coupler
optical
transmission
switching
controls
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
JP13937177A
Other languages
Japanese (ja)
Inventor
Takeshi Usui
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 JP13937177A priority Critical patent/JPS5471904A/en
Publication of JPS5471904A publication Critical patent/JPS5471904A/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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/691—Arrangements for optimizing the photodetector in the receiver
    • H04B10/6911—Photodiode bias control, e.g. for compensating temperature variations

Abstract

PURPOSE:To make a good communication possible by enhancing the coupling degree of a photo coupler only at a communication time and switching the gain of a receiver. CONSTITUTION:Signals from optical transmission path 1 are branched in photo coupler 6 and have control signals separated by separation circuit 10 through optical receiver 8 and are sent to terminal equipment 2. AGC circuit 9 detects the output amplitude of optical receiver 8 and controls it so that its value may be constant, and separated control signals are detected in control circuit 11 and controls the switching and the operation of receiving and transmission of photo coupler 6. The output signal from terminal equipment 2 is transmitted through optical transmitter 7 and photo coupler 6. Then, the coupling degree of photo coupler 6 is enhanced at a transmission/receiving time.
JP13937177A 1977-11-18 1977-11-18 Optical communication unit Pending JPS5471904A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13937177A JPS5471904A (en) 1977-11-18 1977-11-18 Optical communication unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13937177A JPS5471904A (en) 1977-11-18 1977-11-18 Optical communication unit

Publications (1)

Publication Number Publication Date
JPS5471904A true JPS5471904A (en) 1979-06-08

Family

ID=15243759

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13937177A Pending JPS5471904A (en) 1977-11-18 1977-11-18 Optical communication unit

Country Status (1)

Country Link
JP (1) JPS5471904A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01500873A (en) * 1986-09-02 1989-03-23 ヒユーズ・エアクラフト・カンパニー Off-axis optical coupler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01500873A (en) * 1986-09-02 1989-03-23 ヒユーズ・エアクラフト・カンパニー Off-axis optical coupler

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