JPS6465938A - Method for monitoring change of light loss in optical transmission line - Google Patents

Method for monitoring change of light loss in optical transmission line

Info

Publication number
JPS6465938A
JPS6465938A JP22274487A JP22274487A JPS6465938A JP S6465938 A JPS6465938 A JP S6465938A JP 22274487 A JP22274487 A JP 22274487A JP 22274487 A JP22274487 A JP 22274487A JP S6465938 A JPS6465938 A JP S6465938A
Authority
JP
Japan
Prior art keywords
transmission line
monitoring signal
optical transmission
signal
light loss
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
JP22274487A
Other languages
Japanese (ja)
Inventor
Yoshiaki Miyajima
Motoyuki Amaike
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP22274487A priority Critical patent/JPS6465938A/en
Publication of JPS6465938A publication Critical patent/JPS6465938A/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
    • 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
    • H04B10/0775—Performance monitoring and measurement of transmission parameters
    • 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
    • H04B2210/078—Monitoring an optical transmission system using a supervisory signal using a separate wavelength

Landscapes

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

Abstract

PURPOSE:To measure the loss of a optical transmission line while it is used for communication, by coupling a monitoring signal having a different wavelength by using an optical multiplexing/demultiplexing element, and separating the monitoring signal according to the wavelength at an emission end, and obtaining the change of a light loss of the optical transmission line from the level change of the separated monitoring signal. CONSTITUTION:A transmission, equipment outgoing part 3 which outputs a transmission signal of the wavelength lambda1, a monitoring signal light source 5 which outputs the monitoring signal of wavelength lambda2 different from the wavelength lambda1, and the light multiplexing/ demultiplexing element 2 which multiplexes the transmission signal and the monitoring signal and sends it to the optical transmission line 1 from a junction point 7, are provided. Further, at the emission end of the optical transmission line 1, the light multiplexing/demultiplexing element 2' which is connected to the optical transmission line 1 at the junction point 7' and separates the transmission signal and the monitoring signal according to the wavelengths, a transmission device receiving part 4 which receives the transmission signal, and a monitoring signal receiving part 6 which obtains the change of the light loss of the optical transmission line 1 from the level change of the separated monitoring signal, are provided. Thus, the change of the light loss of the optical transmission line can be monitored simultaneously while the transmission signal is transmitted. Therefore, it is not necessary to interrupt a service for measuring the light loss, and the transmission line can be always monitored.
JP22274487A 1987-09-04 1987-09-04 Method for monitoring change of light loss in optical transmission line Pending JPS6465938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22274487A JPS6465938A (en) 1987-09-04 1987-09-04 Method for monitoring change of light loss in optical transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22274487A JPS6465938A (en) 1987-09-04 1987-09-04 Method for monitoring change of light loss in optical transmission line

Publications (1)

Publication Number Publication Date
JPS6465938A true JPS6465938A (en) 1989-03-13

Family

ID=16787224

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22274487A Pending JPS6465938A (en) 1987-09-04 1987-09-04 Method for monitoring change of light loss in optical transmission line

Country Status (1)

Country Link
JP (1) JPS6465938A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2694148A1 (en) * 1992-07-03 1994-01-28 Ericsson Telefon Ab L M Method and device for monitoring branched optical line networks
EP0693831A1 (en) * 1992-10-22 1996-01-24 Laser Precision Corporation Method of detecting breaks in multi-drop feeder system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2694148A1 (en) * 1992-07-03 1994-01-28 Ericsson Telefon Ab L M Method and device for monitoring branched optical line networks
EP0693831A1 (en) * 1992-10-22 1996-01-24 Laser Precision Corporation Method of detecting breaks in multi-drop feeder system

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