GB2403087B - Repeater in an optical transmission system - Google Patents

Repeater in an optical transmission system

Info

Publication number
GB2403087B
GB2403087B GB0419236A GB0419236A GB2403087B GB 2403087 B GB2403087 B GB 2403087B GB 0419236 A GB0419236 A GB 0419236A GB 0419236 A GB0419236 A GB 0419236A GB 2403087 B GB2403087 B GB 2403087B
Authority
GB
United Kingdom
Prior art keywords
monitoring
repeater
response
carrier wave
operating status
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
GB0419236A
Other versions
GB2403087A (en
GB0419236D0 (en
Inventor
Haruo Fujiwara
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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
Priority claimed from JP2001215027A external-priority patent/JP4632585B2/en
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of GB0419236D0 publication Critical patent/GB0419236D0/en
Publication of GB2403087A publication Critical patent/GB2403087A/en
Application granted granted Critical
Publication of GB2403087B publication Critical patent/GB2403087B/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
    • H04B10/07—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
    • H04B10/07—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
    • H04B10/0771—Fault location on the transmission path
    • 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
    • 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)

Abstract

A repeater (20) for use in an optical transmission system capable of monitoring the operating status of Raman-amplifier repeaters even when an optical transmission line is partly disrupted by a fiber failure. An end station (10) sends a monitoring command signal to request a particular repeater to report its operating status, together with a response carrier wave for use in that reporting. With their different wavelengths, an upstream wavelength selector (21-1) in the repeater selectively passes the monitoring command signal while reflecting back the response carrier wave. Responsive to the command, a monitoring controller (22) creates a response message containing operating status information. An excitation unit (24) performs Raman amplification with a pump beam modulated by a modulation controller (23), so that the response message is superimposed on the response carrier wave propagating on the upstream link (L1). The resulting monitoring response signal is routed from the upstream wavelength selector (21-1) to a downstream optical coupler (C2) and sent back to the requesting and end station (10).
GB0419236A 2001-07-16 2002-02-14 Repeater in an optical transmission system Expired - Fee Related GB2403087B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001215027A JP4632585B2 (en) 2001-07-16 2001-07-16 Optical transmission system
GB0203562A GB2377839B (en) 2001-07-16 2002-02-14 Optical transmission system

Publications (3)

Publication Number Publication Date
GB0419236D0 GB0419236D0 (en) 2004-09-29
GB2403087A GB2403087A (en) 2004-12-22
GB2403087B true GB2403087B (en) 2005-03-30

Family

ID=33477743

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0419236A Expired - Fee Related GB2403087B (en) 2001-07-16 2002-02-14 Repeater in an optical transmission system

Country Status (1)

Country Link
GB (1) GB2403087B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7539413B2 (en) 2004-05-19 2009-05-26 Mitsubishi Denki Kabushiki Kaisha Observation apparatus and observation system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2425904A (en) * 2005-05-03 2006-11-08 Marconi Comm Gmbh Optical network fault test apparatus which modifies a received test signal using a passive optical device to generate a response signal
US11588295B2 (en) * 2019-11-01 2023-02-21 Ii-Vi Delaware, Inc. Pump modulation for optical amplifier link communication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0935356A2 (en) * 1998-02-09 1999-08-11 Nec Corporation System for monitoring a digital bidirectional optical communication line
EP1122898A1 (en) * 2000-01-31 2001-08-08 KDD Corporation Optical repeater monitoring system and a method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0935356A2 (en) * 1998-02-09 1999-08-11 Nec Corporation System for monitoring a digital bidirectional optical communication line
EP1122898A1 (en) * 2000-01-31 2001-08-08 KDD Corporation Optical repeater monitoring system and a method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7539413B2 (en) 2004-05-19 2009-05-26 Mitsubishi Denki Kabushiki Kaisha Observation apparatus and observation system

Also Published As

Publication number Publication date
GB2403087A (en) 2004-12-22
GB0419236D0 (en) 2004-09-29

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Legal Events

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

Effective date: 20180214