JPS55107350A - Transmission system of monitor-sessional signal for optical communication - Google Patents

Transmission system of monitor-sessional signal for optical communication

Info

Publication number
JPS55107350A
JPS55107350A JP1332579A JP1332579A JPS55107350A JP S55107350 A JPS55107350 A JP S55107350A JP 1332579 A JP1332579 A JP 1332579A JP 1332579 A JP1332579 A JP 1332579A JP S55107350 A JPS55107350 A JP S55107350A
Authority
JP
Japan
Prior art keywords
signal
sessional
monitor
superposition
digital 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
JP1332579A
Other languages
Japanese (ja)
Inventor
Koichi Oota
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 JP1332579A priority Critical patent/JPS55107350A/en
Priority to MX18110180A priority patent/MX152817A/en
Publication of JPS55107350A publication Critical patent/JPS55107350A/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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/074—Monitoring an optical transmission system using a supervisory signal using a superposed, over-modulated signal

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To enable to transmit the monitor-sessional signal without increasing the band of transmission line, by the pulse width modulation of monitoring and sessional signal, and transmitting it to the communication digital signal with superposition. CONSTITUTION:In the superposition circuit 3, the input digital signal (a) and the monitor-sessional signal (b) in pulse width modulation are outputted with superposition. The superposition signal (d) is inputted to the drive circuit 7 to emit the light emitting element 8 and it is transmitted with the transmission line 9 by optical fiber. The light is received with the photo detector 10, and the digital signal (a) is picked up from the superposition signal (d) after amplification, the content of the information is identified at the indentifying circuit 13 and the monitor and sessional signal (b') is demodulated with the low pass filter 15. Thus, without producing the interference between codes of digital signal for communication, the transmission of the monitoring and sessional signal can be transmitted.
JP1332579A 1979-02-09 1979-02-09 Transmission system of monitor-sessional signal for optical communication Pending JPS55107350A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1332579A JPS55107350A (en) 1979-02-09 1979-02-09 Transmission system of monitor-sessional signal for optical communication
MX18110180A MX152817A (en) 1979-02-09 1980-02-07 IMPROVED METHOD FOR RECOVERING BROMINE FROM A CONTAINING GAS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1332579A JPS55107350A (en) 1979-02-09 1979-02-09 Transmission system of monitor-sessional signal for optical communication

Publications (1)

Publication Number Publication Date
JPS55107350A true JPS55107350A (en) 1980-08-18

Family

ID=11829991

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1332579A Pending JPS55107350A (en) 1979-02-09 1979-02-09 Transmission system of monitor-sessional signal for optical communication

Country Status (1)

Country Link
JP (1) JPS55107350A (en)

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