JPS5564450A - Photo transmitter - Google Patents

Photo transmitter

Info

Publication number
JPS5564450A
JPS5564450A JP13770478A JP13770478A JPS5564450A JP S5564450 A JPS5564450 A JP S5564450A JP 13770478 A JP13770478 A JP 13770478A JP 13770478 A JP13770478 A JP 13770478A JP S5564450 A JPS5564450 A JP S5564450A
Authority
JP
Japan
Prior art keywords
signal
photo
reference signal
level
output
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
JP13770478A
Other languages
Japanese (ja)
Inventor
Yukihiko Mineshima
Naomasa Hanano
Masaaki Takahashi
Hiroshi Nakamura
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP13770478A priority Critical patent/JPS5564450A/en
Publication of JPS5564450A publication Critical patent/JPS5564450A/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
    • 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

Abstract

PURPOSE:To discriminate accurately a photo signal level when arrival of a reference signal stops due to the break, etc., of a reference-signal optical fiber, by storing a memory with the level of the reference signal to be transmitted together with a photo signal. CONSTITUTION:A reference signal of a constant level is sent out from transmitter 1 through optical fiber F1 while photo signals are also sent out from transmitters 2- n through optical fibers F2-Fn, and the reference signal is converted into a constant-level electric signal by reception part 1'. Through LPF, this electric signal is applied to A/D converter AD, whose output is stored in memory M and also applied to D/A converter DA through switch SW, and an output converted into an analog signal is applied to comparators CON2-CONn. Further, photo signals are converted by receivers 2'-n' into electric signals, which are compared by comparators CON2-n with the reference signal. When no reference signal arrives from optical fiber F1, switch SW is put into operation by the output of comparator CON1 to discriminate the photo signal levels by the output of memory M.
JP13770478A 1978-11-08 1978-11-08 Photo transmitter Pending JPS5564450A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13770478A JPS5564450A (en) 1978-11-08 1978-11-08 Photo transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13770478A JPS5564450A (en) 1978-11-08 1978-11-08 Photo transmitter

Publications (1)

Publication Number Publication Date
JPS5564450A true JPS5564450A (en) 1980-05-15

Family

ID=15204860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13770478A Pending JPS5564450A (en) 1978-11-08 1978-11-08 Photo transmitter

Country Status (1)

Country Link
JP (1) JPS5564450A (en)

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