GB2402282B - Optical repeater - Google Patents

Optical repeater

Info

Publication number
GB2402282B
GB2402282B GB0419730A GB0419730A GB2402282B GB 2402282 B GB2402282 B GB 2402282B GB 0419730 A GB0419730 A GB 0419730A GB 0419730 A GB0419730 A GB 0419730A GB 2402282 B GB2402282 B GB 2402282B
Authority
GB
United Kingdom
Prior art keywords
gain
characteristic
signals
optical amplification
unit
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
GB0419730A
Other versions
GB0419730D0 (en
GB2402282A (en
Inventor
Shin-Ichirou Harasawa
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 JP2001226087A external-priority patent/JP4651231B2/en
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to GB0502272A priority Critical patent/GB2408863B/en
Priority to GB0502271A priority patent/GB2408862B/en
Publication of GB0419730D0 publication Critical patent/GB0419730D0/en
Publication of GB2402282A publication Critical patent/GB2402282A/en
Application granted granted Critical
Publication of GB2402282B publication Critical patent/GB2402282B/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
    • H04B10/29—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
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • H04B10/2942—Signal power control in a multiwavelength system, e.g. gain equalisation using automatic gain control [AGC]
    • 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
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/075—Monitoring an optical transmission system using a supervisory signal using a pilot tone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/08—Shut-down or eye-safety

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

An optical repeater (20) comprises an optical amplification unit (21-1, 21-2), which realizes optical amplification in each of a plurality of gain bands with a gain which is determined based on a control signal, a characteristic-signal generation unit (22-1, 22-2) which receives a plurality of tone signals and generates a plurality of characteristic signals each representing a characteristic of one of the plurality of tone signals, and a gain control unit (23-1, 23-2), which compares each of the plurality of characteristic signals with a reference signal and generates the control signal corresponding to each of the plurality of gain bands so as to equalize the gain in the optical amplification in each of the plurality of gain bands. Preferably, the repeater also comprises means 26 to activate/deactivate the amplification unit in response to the control tones.
GB0419730A 2001-07-26 2002-02-04 Optical repeater Expired - Fee Related GB2402282B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0502272A GB2408863B (en) 2001-07-26 2002-02-04 Optical repeater
GB0502271A GB2408862B (en) 2001-07-26 2002-02-04 Optical repeater

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001226087A JP4651231B2 (en) 2001-07-26 2001-07-26 Optical transmission system
GB0202560A GB2379815B (en) 2001-07-26 2002-02-04 Optical transmission system

Publications (3)

Publication Number Publication Date
GB0419730D0 GB0419730D0 (en) 2004-10-06
GB2402282A GB2402282A (en) 2004-12-01
GB2402282B true GB2402282B (en) 2005-05-04

Family

ID=33436267

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0419730A Expired - Fee Related GB2402282B (en) 2001-07-26 2002-02-04 Optical repeater

Country Status (1)

Country Link
GB (1) GB2402282B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2280561A (en) * 1993-07-31 1995-02-01 Northern Telecom Ltd Optical transmission system
EP0782225A2 (en) * 1995-12-19 1997-07-02 Lucent Technologies Inc. Low tilt, high gain fiber amplifier
EP0933894A1 (en) * 1998-01-27 1999-08-04 Lucent Technologies Inc. Method and system for controlling optical amplification in wavelength division multiplex optical transmission

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2280561A (en) * 1993-07-31 1995-02-01 Northern Telecom Ltd Optical transmission system
EP0782225A2 (en) * 1995-12-19 1997-07-02 Lucent Technologies Inc. Low tilt, high gain fiber amplifier
EP0933894A1 (en) * 1998-01-27 1999-08-04 Lucent Technologies Inc. Method and system for controlling optical amplification in wavelength division multiplex optical transmission

Also Published As

Publication number Publication date
GB0419730D0 (en) 2004-10-06
GB2402282A (en) 2004-12-01

Similar Documents

Publication Publication Date Title
KR890012464A (en) Infrared stereo speaker system
MY106871A (en) Noise reducing receiver device.
BR0114086A (en) Electronic Sound Selection System
WO2002069317A3 (en) Networked sound masking and paging system
GB2379815B (en) Optical transmission system
DE60135905D1 (en) USE OF VRA (VOICE-TO-REMAINING AUDIO) FOR CONSUMER APPLICATIONS
ATE429786T1 (en) HEARING AID ARRANGEMENT FOR AN OPEN EAR CANAL
WO2003071827A3 (en) Compact surround-sound system
IL123481A (en) Musical instruments incorporating loudspeakers
DE59502021D1 (en) Device for suppressing snoring
CA2224851A1 (en) Optical arrangement for amplifying wdm signals
WO2001039541A3 (en) Flat loudspeaker system for bass reproduction
GB2402282B (en) Optical repeater
US6069958A (en) Listening apparatus for remote wildlife sound acquistion
KR970022957A (en) Karaoke Amplifier Variablely Adjusts the Parameter Range of an Audio Signal
USH1503H (en) Cordless electric guitar
DE60206296D1 (en) FIRE ALARM MODULE
WO2004055980A3 (en) System for regulating the level of an amplified signal in an amplification chain.
US5999618A (en) Telephone interface for simultaneous audio presentation at separate locations utilizing amplitude modulated carrier signals
KR960016495A (en) Audio level variable output device according to viewing position
KR960003075A (en) Automatic volume control
JPS6444613A (en) Sound volume adjusting circuit
KR200225420Y1 (en) Improved microphone
DE60113847D1 (en) Device for audio playback
KR970076484A (en) Wireless Amplifier

Legal Events

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

Effective date: 20180204