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GB2294374B - A supervising loopback circuit and a transmitting and receiving circuit for an optical repeater system - Google Patents

A supervising loopback circuit and a transmitting and receiving circuit for an optical repeater system

Info

Publication number
GB2294374B
GB2294374B GB9525025A GB9525025A GB2294374B GB 2294374 B GB2294374 B GB 2294374B GB 9525025 A GB9525025 A GB 9525025A GB 9525025 A GB9525025 A GB 9525025A GB 2294374 B GB2294374 B GB 2294374B
Authority
GB
United Kingdom
Prior art keywords
signal
optical
circuit
supervising
transmitting
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.)
Expired - Fee Related
Application number
GB9525025A
Other versions
GB9525025D0 (en
GB2294374A (en
Inventor
Yukio Horiuchi
Shu Yamamoto
Shigeyuki Akiba
Hiroharu Wakabayashi
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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
Priority claimed from JP4150491A external-priority patent/JP2968394B2/en
Application filed by Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Publication of GB9525025D0 publication Critical patent/GB9525025D0/en
Publication of GB2294374A publication Critical patent/GB2294374A/en
Application granted granted Critical
Publication of GB2294374B publication Critical patent/GB2294374B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H04B10/03—Arrangements for fault recovery
    • H04B10/035—Arrangements for fault recovery using loopbacks
    • 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
    • H04B10/0777—Monitoring line amplifier or line repeater equipment
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/298—Two-way repeaters, i.e. repeaters amplifying separate upward and downward lines
    • 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)
  • Optical Communication System (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

A supervising transmitting and receiving circuit for an optical transmission system having a plurality of optical repeaters, each of which includes a pair of up and down side repeating circuits using respective optical amplifiers inserted in an optical transmission link having up and down side optical fibre channels for a two way communication. The circuit comprises a sine wave oscillator 25 producing a carrier, circuit 36 generating pulses which have a width narrower than a time of an optical signal travelling through the spacing between said repeaters, and a period longer than a going and returning delay time of an optical signal travelling the overall length of said optical transmission system, a gate circuit 37 for modulating the amplitude of said carrier by said pulse signal and outputting a pulse modulated signal, a transmission light source 28 for transmitting a communication signal as a trunk channel signal, an optical amplitude modulator 29 for amplitude-modulating said trunk channel signal with said pulse modulated signal to produce a supervisory signal and sending said supervisory signal to an up side optical fibre channel, a photo-detector 30 for converting a returned optical signal into an electric signal, said returned optical signal returned by a group of parallel supervising loopback circuits Aa - An through a down side optical fibre channel, a band pass filter 38 for eliminating noise of said electric signal and an oscilloscope 39 for displaying said electric signals passed through said band pass filter. <IMAGE>
GB9525025A 1992-06-10 1993-06-08 A supervising loopback circuit and a transmitting and receiving circuit for an optical repeater system Expired - Fee Related GB2294374B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4150491A JP2968394B2 (en) 1992-06-10 1992-06-10 Monitoring method of optical repeater system, return circuit, and transmission / reception circuit
GB9311825A GB2268017B (en) 1992-06-10 1993-06-08 Supervisory method,loopback circuit,and transmitting and receiving circuit for an optical repeater system

Publications (3)

Publication Number Publication Date
GB9525025D0 GB9525025D0 (en) 1996-02-07
GB2294374A GB2294374A (en) 1996-04-24
GB2294374B true GB2294374B (en) 1996-08-28

Family

ID=26303024

Family Applications (2)

Application Number Title Priority Date Filing Date
GB9525025A Expired - Fee Related GB2294374B (en) 1992-06-10 1993-06-08 A supervising loopback circuit and a transmitting and receiving circuit for an optical repeater system
GB9522525A Expired - Fee Related GB2294373B (en) 1992-06-10 1993-06-08 Supervisory method,loopback circuit,and transmitting and receiving circuit for an optical repeater system

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB9522525A Expired - Fee Related GB2294373B (en) 1992-06-10 1993-06-08 Supervisory method,loopback circuit,and transmitting and receiving circuit for an optical repeater system

Country Status (1)

Country Link
GB (2) GB2294374B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5969833A (en) * 1996-10-09 1999-10-19 Tyco Submarine Systems Ltd. Monitoring system using an optical side tone as a test signal
US6211985B1 (en) * 1997-08-08 2001-04-03 Tyco Submarine Systems Ltd. Remote monitoring of an optical transmission system using line monitoring signals
FR2767995B1 (en) * 1997-09-01 1999-10-15 Alsthom Cge Alcatel OPTICAL TRANSMISSION SYSTEM WITH COHERENT TIME OPTICAL REFLECTOMETRY
EP1122898A1 (en) * 2000-01-31 2001-08-08 KDD Corporation Optical repeater monitoring system and a method thereof
JP4632585B2 (en) * 2001-07-16 2011-02-16 富士通株式会社 Optical transmission system
GB0409005D0 (en) 2004-04-22 2004-05-26 Azea Networks Ltd Pulsed high loss loop back signalling scheme
DE602006010058D1 (en) * 2006-08-03 2009-12-10 Alcatel Lucent Control circuit for online OTDR measurement with integrated sine wave
CN101931471B (en) * 2009-06-23 2013-08-07 华为海洋网络有限公司 Method for monitoring fiber line state, repeater and submarine cable system
EP4012942A1 (en) * 2020-12-08 2022-06-15 Alcatel Submarine Networks Supervision of an optical path including an amplifier

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084371A2 (en) * 1982-01-19 1983-07-27 Siemens Aktiengesellschaft Carrier frequency system for four-wire operation
GB2123236A (en) * 1982-07-03 1984-01-25 Philips Nv Arrangement for locating faults in an optical transmission system
US4736464A (en) * 1984-09-28 1988-04-05 Bbc Brown, Boveri & Company Limited Method for the additional transmission of information via a digital auxiliary channel, in an optical transmission system
GB2207827A (en) * 1987-07-23 1989-02-08 Kokusai Denshin Denwa Co Ltd Fault monitoring system for optical fiber communication systems
GB2236235A (en) * 1989-08-09 1991-03-27 Standard Telephones Cables Ltd Digital transmission system
EP0531047A2 (en) * 1991-09-03 1993-03-10 AT&T Corp. Optical line monitor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084371A2 (en) * 1982-01-19 1983-07-27 Siemens Aktiengesellschaft Carrier frequency system for four-wire operation
GB2123236A (en) * 1982-07-03 1984-01-25 Philips Nv Arrangement for locating faults in an optical transmission system
US4736464A (en) * 1984-09-28 1988-04-05 Bbc Brown, Boveri & Company Limited Method for the additional transmission of information via a digital auxiliary channel, in an optical transmission system
GB2207827A (en) * 1987-07-23 1989-02-08 Kokusai Denshin Denwa Co Ltd Fault monitoring system for optical fiber communication systems
GB2236235A (en) * 1989-08-09 1991-03-27 Standard Telephones Cables Ltd Digital transmission system
EP0531047A2 (en) * 1991-09-03 1993-03-10 AT&T Corp. Optical line monitor

Also Published As

Publication number Publication date
GB9525025D0 (en) 1996-02-07
GB9522525D0 (en) 1996-01-03
GB2294373A (en) 1996-04-24
GB2294373B (en) 1996-08-28
GB2294374A (en) 1996-04-24

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20050608