GB2268017B - Supervisory method,loopback circuit,and transmitting and receiving circuit for an optical repeater system - Google Patents

Supervisory method,loopback circuit,and transmitting and receiving circuit for an optical repeater system

Info

Publication number
GB2268017B
GB2268017B GB9311825A GB9311825A GB2268017B GB 2268017 B GB2268017 B GB 2268017B GB 9311825 A GB9311825 A GB 9311825A GB 9311825 A GB9311825 A GB 9311825A GB 2268017 B GB2268017 B GB 2268017B
Authority
GB
United Kingdom
Prior art keywords
circuit
transmitting
optical
supervisory
optical repeater
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
GB9311825A
Other versions
GB2268017A (en
GB9311825D0 (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
Application filed by Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to GB9522525A priority Critical patent/GB2294373B/en
Priority to GB9525025A priority patent/GB2294374B/en
Publication of GB9311825D0 publication Critical patent/GB9311825D0/en
Publication of GB2268017A publication Critical patent/GB2268017A/en
Application granted granted Critical
Publication of GB2268017B publication Critical patent/GB2268017B/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
    • H04B10/293—Signal power control
    • H04B10/2933—Signal power control considering the whole optical path
    • H04B10/2939—Network aspects
    • 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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

The system comprises optical repeaters 16a to 16n, each including two optical amplifiers 17a to 17n and 18a to 18n, inserted in an optical fibre transmission link having up 12a to 12n and down 13a to 13n side channels. The monitor supervises the condition of the optical transmission link using a supervisory signal from one of transmission stations 22a, 23b superimposed (e.g. modulated) on the traffic signal. Each repeater has a conducting loopback circuit Aa to An which attenuates and returns part of a signal on one channel onto the other channel, so that a plurality of supervisory signals are returned. The supervisory signals can be distinguished at the transmission station. <IMAGE>
GB9311825A 1992-06-10 1993-06-08 Supervisory method,loopback circuit,and transmitting and receiving circuit for an optical repeater system Expired - Fee Related GB2268017B (en)

Priority Applications (2)

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

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
GB9311825D0 GB9311825D0 (en) 1993-07-28
GB2268017A GB2268017A (en) 1993-12-22
GB2268017B true GB2268017B (en) 1996-08-28

Family

ID=15498036

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9311825A Expired - Fee Related GB2268017B (en) 1992-06-10 1993-06-08 Supervisory method,loopback circuit,and transmitting and receiving circuit for an optical repeater system

Country Status (2)

Country Link
JP (1) JP2968394B2 (en)
GB (1) GB2268017B (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2273623B (en) * 1992-12-15 1996-12-04 Northern Telecom Ltd Optical transmission system
JPH0795161A (en) * 1993-09-20 1995-04-07 Fujitsu Ltd Optical amplification relay transmission system
JP3373283B2 (en) * 1994-02-25 2003-02-04 富士通株式会社 Optical amplification repeater
JP2748908B2 (en) * 1995-10-19 1998-05-13 日本電気株式会社 Optical transmission line characteristic measuring method and apparatus, and optical wavelength multiplex transmission method and apparatus
JPH09153862A (en) 1995-11-30 1997-06-10 Kokusai Denshin Denwa Co Ltd <Kdd> Monitoring method for optical amplification relay transmission system
JP3055452B2 (en) * 1996-01-10 2000-06-26 日本電気株式会社 Optical transmission line monitoring method
JPH09321701A (en) * 1996-05-31 1997-12-12 Fujitsu Ltd Optical communication system and optical amplifier
JPH10247878A (en) * 1997-03-04 1998-09-14 Kokusai Denshin Denwa Co Ltd <Kdd> Optical transmission system, optical distributor and optical signal processing unit
US6301404B1 (en) 1998-03-17 2001-10-09 Nec Corporation Supervisory signal optical bypass circuit, optical amplifying repeater and supervisory system
JP3293565B2 (en) 1998-08-14 2002-06-17 日本電気株式会社 Optical amplification repeater
JP2000312185A (en) * 1999-04-28 2000-11-07 Nec Corp Optical repeating amplifier for wavelength multiplex optical transmission, and wavelength multiplex optical transmission device using the same
JP2000324053A (en) * 1999-05-07 2000-11-24 Nec Corp Branching device
KR100467319B1 (en) * 2002-06-08 2005-01-24 한국전자통신연구원 Wavelength division multiplexing system and method for suppressing unwanted alarm and shutting down laser
GB0409005D0 (en) * 2004-04-22 2004-05-26 Azea Networks Ltd Pulsed high loss loop back signalling scheme
DE102005063102A1 (en) * 2005-12-30 2007-07-12 Adva Ag Optical Networking Method and device for monitoring an optical transmission path, in particular an optical transmission path to an end user of a transmission network
US8005358B2 (en) * 2007-07-24 2011-08-23 Tyco Electronics Subsea Communications Llc System and method for suppressing beat noise in line monitoring equipment
US7809279B2 (en) * 2007-07-27 2010-10-05 Tyco Electronics Subsea Communications Llc System and method using differential loop gain for fault identification in line monitoring equipment
WO2022071167A1 (en) * 2020-09-30 2022-04-07 日本電気株式会社 Communication system and method for controlling communication system

Citations (5)

* 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
EP0111582A1 (en) * 1982-12-18 1984-06-27 ANT Nachrichtentechnik GmbH Fault locating arrangement for an optical fibre cable link
US4972513A (en) * 1987-07-23 1990-11-20 Kokusai Denshin Denwa Kabushiki Kaisha Multi-point optical amplification repeating system
GB2253533A (en) * 1990-11-21 1992-09-09 Plessey Telecomm Optical transmission monitoring
EP0531047A2 (en) * 1991-09-03 1993-03-10 AT&T Corp. Optical line monitor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5944829B2 (en) * 1980-11-14 1984-11-01 日本電信電話株式会社 Transmission path monitoring method
JPS6033757A (en) * 1983-08-05 1985-02-21 Agency Of Ind Science & Technol Error code rate measuring device
JPH0246031A (en) * 1988-08-06 1990-02-15 Fujitsu Ltd Fault point searching system
JP2582158B2 (en) * 1989-06-07 1997-02-19 国際電信電話株式会社 Fault monitoring method for optical communication systems

Patent Citations (5)

* 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
EP0111582A1 (en) * 1982-12-18 1984-06-27 ANT Nachrichtentechnik GmbH Fault locating arrangement for an optical fibre cable link
US4972513A (en) * 1987-07-23 1990-11-20 Kokusai Denshin Denwa Kabushiki Kaisha Multi-point optical amplification repeating system
GB2253533A (en) * 1990-11-21 1992-09-09 Plessey Telecomm Optical transmission monitoring
EP0531047A2 (en) * 1991-09-03 1993-03-10 AT&T Corp. Optical line monitor

Also Published As

Publication number Publication date
JP2968394B2 (en) 1999-10-25
JPH05344067A (en) 1993-12-24
GB2268017A (en) 1993-12-22
GB9311825D0 (en) 1993-07-28

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20050608