JPS5634247A - Light communication system - Google Patents

Light communication system

Info

Publication number
JPS5634247A
JPS5634247A JP10974279A JP10974279A JPS5634247A JP S5634247 A JPS5634247 A JP S5634247A JP 10974279 A JP10974279 A JP 10974279A JP 10974279 A JP10974279 A JP 10974279A JP S5634247 A JPS5634247 A JP S5634247A
Authority
JP
Japan
Prior art keywords
signal
communication system
service
output
conversion
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
JP10974279A
Other languages
Japanese (ja)
Inventor
Kazunori Omura
Yusaku Yamada
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 JP10974279A priority Critical patent/JPS5634247A/en
Publication of JPS5634247A publication Critical patent/JPS5634247A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems

Abstract

PURPOSE:To obtain a light communication system requiring no timing adjustment, by converting the digital signal to an analogue signal and transmitting it in the communication system where the data signal and the service signal are superposed and transmitted. CONSTITUTION:The output of data signal source PSS is subjected to D/A conversion and is superposed onto the service signal from service signal source TEL by synthesizing unit CMB. The output signal of unit CMB has the frequency modulated by modulator FMD and is converted to not only a digital signal by electro-optic converter E/O but also a light signal and is transmitted through an optical fiber. The received light signal is converted to not only an electric signal by photoelectric converter O/E but also an analogue signal and is applied to FM demodulator DSR. The demodulator output has the frequency divided by branching unit DIV, and one is applied to receiver RCV as a service signal, and the other is applied to data receiving unit DR after A/D conversion.
JP10974279A 1979-08-30 1979-08-30 Light communication system Pending JPS5634247A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10974279A JPS5634247A (en) 1979-08-30 1979-08-30 Light communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10974279A JPS5634247A (en) 1979-08-30 1979-08-30 Light communication system

Publications (1)

Publication Number Publication Date
JPS5634247A true JPS5634247A (en) 1981-04-06

Family

ID=14518087

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10974279A Pending JPS5634247A (en) 1979-08-30 1979-08-30 Light communication system

Country Status (1)

Country Link
JP (1) JPS5634247A (en)

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