JPS5611324A - Light signal receiver - Google Patents

Light signal receiver

Info

Publication number
JPS5611324A
JPS5611324A JP8685779A JP8685779A JPS5611324A JP S5611324 A JPS5611324 A JP S5611324A JP 8685779 A JP8685779 A JP 8685779A JP 8685779 A JP8685779 A JP 8685779A JP S5611324 A JPS5611324 A JP S5611324A
Authority
JP
Japan
Prior art keywords
resistance
incident
disturbing light
flowed
light
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.)
Granted
Application number
JP8685779A
Other languages
Japanese (ja)
Other versions
JPS6022284B2 (en
Inventor
Takashi Takeuchi
Shinichi Ohashi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP54086857A priority Critical patent/JPS6022284B2/en
Publication of JPS5611324A publication Critical patent/JPS5611324A/en
Publication of JPS6022284B2 publication Critical patent/JPS6022284B2/en
Expired 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
    • H04B10/697—Arrangements for reducing noise and distortion

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To make communication possible even if a disturbing light is incident, by detecting the incident disturbing light to control the amplification degree of a receiving circuit according to the detection output. CONSTITUTION:A current flowed due to the disturbing light incident onto photodetecting element 1 is detected as voltage drop of resistance 6. At this time, the AC current dependent upon signal components is bypassed by capacity 8 connected in parallel to resistance 6. The drain and the source of FET9 are inserted in series to AC bypass capacity 7 of emitter-grounded amplifier 3, which amplifies the light signal, to constitute a circuit so that the voltage between the gate and the source is given by the voltage of resistance 6. When the disturbing light is incident and a noise current is flowed to photodetecting element 1 to increase voltage drop of resistance 6, the conductance of FET9 is lowered, and the AC signal is flowed to resistance 11, and the amplification degree fo amplifier 3 is lowered up to a value determined by the ratio of emitter-grounded resistance 11 to collector load resistance 10. Consequently, communication is possible even if the disturbing light is incident.
JP54086857A 1979-07-11 1979-07-11 optical signal receiver Expired JPS6022284B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54086857A JPS6022284B2 (en) 1979-07-11 1979-07-11 optical signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54086857A JPS6022284B2 (en) 1979-07-11 1979-07-11 optical signal receiver

Publications (2)

Publication Number Publication Date
JPS5611324A true JPS5611324A (en) 1981-02-04
JPS6022284B2 JPS6022284B2 (en) 1985-06-01

Family

ID=13898475

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54086857A Expired JPS6022284B2 (en) 1979-07-11 1979-07-11 optical signal receiver

Country Status (1)

Country Link
JP (1) JPS6022284B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0177216A3 (en) * 1984-09-29 1988-07-20 International Standard Electric Corporation Optical receiver
JP2024043803A (en) * 2022-09-20 2024-04-02 三菱電機株式会社 Equipment status detection transmission device and equipment status detection transmission method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0177216A3 (en) * 1984-09-29 1988-07-20 International Standard Electric Corporation Optical receiver
JP2024043803A (en) * 2022-09-20 2024-04-02 三菱電機株式会社 Equipment status detection transmission device and equipment status detection transmission method

Also Published As

Publication number Publication date
JPS6022284B2 (en) 1985-06-01

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