JPS568934A - Signal generator by light - Google Patents

Signal generator by light

Info

Publication number
JPS568934A
JPS568934A JP8529079A JP8529079A JPS568934A JP S568934 A JPS568934 A JP S568934A JP 8529079 A JP8529079 A JP 8529079A JP 8529079 A JP8529079 A JP 8529079A JP S568934 A JPS568934 A JP S568934A
Authority
JP
Japan
Prior art keywords
circuit
light
photodetector
light emitting
drives
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
JP8529079A
Other languages
Japanese (ja)
Inventor
Fumio Maruyama
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.)
Sumita Optical Glass Inc
Original Assignee
Sumita Optical Glass Inc
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 Sumita Optical Glass Inc filed Critical Sumita Optical Glass Inc
Priority to JP8529079A priority Critical patent/JPS568934A/en
Publication of JPS568934A publication Critical patent/JPS568934A/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

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 discriminate easily whether shielding a photodetector from a light emitting element is completed, by using a PLL circuit that is driven by photodetection and then drives the light emitting element. CONSTITUTION:One signal photodetected by photodetector 1 is input to multiplying circuit 2, and the other drives PLL circuit 6 through 90 deg. phase-shifting circuit 5. One output of the PLL circuit is input to multiplying circuit 2 and the other drives light emitting diode 8 through light-source driving circuit 9. Assuming a body to reside between the photodetector and light emitting diode for shielding, no output signal is sent out because any output of the photodetector does not arrive, but when no body resides, two signals 90 deg. out of phase with each other are input to multiplying circuit 2, which outputs a low-frequency signal. Then, providing the light source and photodetection part in the loop of the PLL circuit can attain synchronization between the both, so that malfunction caused by disturbing light will not occur.
JP8529079A 1979-07-05 1979-07-05 Signal generator by light Pending JPS568934A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8529079A JPS568934A (en) 1979-07-05 1979-07-05 Signal generator by light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8529079A JPS568934A (en) 1979-07-05 1979-07-05 Signal generator by light

Publications (1)

Publication Number Publication Date
JPS568934A true JPS568934A (en) 1981-01-29

Family

ID=13854437

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8529079A Pending JPS568934A (en) 1979-07-05 1979-07-05 Signal generator by light

Country Status (1)

Country Link
JP (1) JPS568934A (en)

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