JPS57178452A - Optical communication system - Google Patents

Optical communication system

Info

Publication number
JPS57178452A
JPS57178452A JP56064898A JP6489881A JPS57178452A JP S57178452 A JPS57178452 A JP S57178452A JP 56064898 A JP56064898 A JP 56064898A JP 6489881 A JP6489881 A JP 6489881A JP S57178452 A JPS57178452 A JP S57178452A
Authority
JP
Japan
Prior art keywords
signal
circuit
cmi
converts
clock signal
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
JP56064898A
Other languages
Japanese (ja)
Inventor
Akira Fukuda
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP56064898A priority Critical patent/JPS57178452A/en
Priority to EP82301861A priority patent/EP0063886B1/en
Priority to DE8282301861T priority patent/DE3267979D1/en
Priority to CA000400788A priority patent/CA1187187A/en
Priority to US06/368,846 priority patent/US4442528A/en
Publication of JPS57178452A publication Critical patent/JPS57178452A/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
    • H04L25/4906—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 using binary codes
    • H04L25/4908—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 using binary codes using mBnB codes
    • H04L25/491—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 using binary codes using mBnB codes using 1B2B codes
    • H04L25/4912—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 using binary codes using mBnB codes using 1B2B codes using CMI or 2-HDB-3 code

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To obtain a compact communication system which has a high transmission speed and a large capacity and easily discriminates the absence state of a light beam, by generating a clock signal by using a ternary signal generated by a clock signal after converting a transmitted signal into a CMI code. CONSTITUTION:A CMI encoder 1 converts a transmitted signal into a CMI code, which is modulated by a modulating circuit 2 into a ternary signal consisting of positive and negative pulses. In a circuit 3, a light emitting element converts the input into a light signal. A circuit 4 demodulates the received light signal into its positive and negative pulses, and a demodulating circuit 5 converts the CMI code into a pulse signal. Then, a CMI decoder 6 generates a demodulated signal and a demodulated clock signal. On the other hand, a photodetecting circuit 4 finds the average value of a photo-detected signal and on the basis of the average value, a fault of a transmission line is detected by a circuit 7 to output a transmission line monitor signal.
JP56064898A 1981-04-27 1981-04-27 Optical communication system Pending JPS57178452A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP56064898A JPS57178452A (en) 1981-04-27 1981-04-27 Optical communication system
EP82301861A EP0063886B1 (en) 1981-04-27 1982-04-08 A method of and a system for pulse communication
DE8282301861T DE3267979D1 (en) 1981-04-27 1982-04-08 A method of and a system for pulse communication
CA000400788A CA1187187A (en) 1981-04-27 1982-04-08 Method and system for pulse communication
US06/368,846 US4442528A (en) 1981-04-27 1982-04-14 Pulse communication method and system using CMI to 3-level CMI conversion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56064898A JPS57178452A (en) 1981-04-27 1981-04-27 Optical communication system

Publications (1)

Publication Number Publication Date
JPS57178452A true JPS57178452A (en) 1982-11-02

Family

ID=13271348

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56064898A Pending JPS57178452A (en) 1981-04-27 1981-04-27 Optical communication system

Country Status (1)

Country Link
JP (1) JPS57178452A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5398747A (en) * 1977-02-09 1978-08-29 Hewlett Packard Yokogawa Cmi encoder
JPS5599856A (en) * 1979-01-23 1980-07-30 Sumitomo Electric Ind Ltd Light modulation and demodulation unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5398747A (en) * 1977-02-09 1978-08-29 Hewlett Packard Yokogawa Cmi encoder
JPS5599856A (en) * 1979-01-23 1980-07-30 Sumitomo Electric Ind Ltd Light modulation and demodulation unit

Similar Documents

Publication Publication Date Title
ES8106821A1 (en) Optical fiber repeater
JPS57178452A (en) Optical communication system
JPS57185740A (en) Optical transmission system
JPS6471247A (en) Interface circuit
JPS56169948A (en) Optical multiplex transmission system
JPS5713837A (en) Code transmission system
JPS5687948A (en) Optical communication system
JPS56758A (en) Bidirectional optical transmission system
JPS5537023A (en) Light source extending system of light relay
EP0091619A3 (en) Remote control device
JPS5797734A (en) Receiving device
JPS5725737A (en) Optical fiber communication device
JPS54152901A (en) Light communication unit
JPS57112158A (en) Code converting circuit
JPS56115070A (en) Facsimile repeating device
JPS57208738A (en) Optical transmitter
JPS6460036A (en) Frame signal transmitting system
JPS5613850A (en) Secondary signal piling transmission system
JPS555508A (en) Optical data communication system
SU639144A1 (en) Opto-electronic device for transmitting and receiving analogue signals
JPS54138304A (en) Transmission unit of optical multiplex modulation
JPS5632844A (en) Light repeater monitoring system
Heinlein Multimode glass fiber as transmission medium for digital signals
JPS56136081A (en) Facsimile equipment
JPS55166353A (en) Optical fiber transmission system