CA2239913A1 - Wdm network with control wavelength - Google Patents

Wdm network with control wavelength

Info

Publication number
CA2239913A1
CA2239913A1 CA2239913A CA2239913A CA2239913A1 CA 2239913 A1 CA2239913 A1 CA 2239913A1 CA 2239913 A CA2239913 A CA 2239913A CA 2239913 A CA2239913 A CA 2239913A CA 2239913 A1 CA2239913 A1 CA 2239913A1
Authority
CA
Canada
Prior art keywords
wavelength
lambda
time slot
signalling
station
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.)
Granted
Application number
CA2239913A
Other languages
French (fr)
Other versions
CA2239913C (en
Inventor
Alan Mcguire
Hideaki Tsushima
Peter Edward Barnsley
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.)
British Telecommunications PLC
Hitachi Ltd
Original Assignee
Alan Mcguire
Hideaki Tsushima
Hitachi Limited
Peter Edward Barnsley
British Telecommunications Public Limited Company
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 GB9401488A external-priority patent/GB9401488D0/en
Application filed by Alan Mcguire, Hideaki Tsushima, Hitachi Limited, Peter Edward Barnsley, British Telecommunications Public Limited Company filed Critical Alan Mcguire
Publication of CA2239913A1 publication Critical patent/CA2239913A1/en
Application granted granted Critical
Publication of CA2239913C publication Critical patent/CA2239913C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Optical Communication System (AREA)

Abstract

A wavelength division multiplex communication system comprises a head station and a plurality of terminal stations interconnected by an optical fibre cable. The head station transmits continuous wave modulated wavelengths (.lambda.1, and .lambda.k), a signalling wavelength (.lambda. 0) which is used to indicate, in each time slot, which wavelengths in the following time slot are available for transmission. Each terminal station is arranged to receive the signalling wavelength, to determine therefrom whether the next time slot contains any data packets for that terminal station and, if so, to receive the packets.
The terminal station is arranged, if it has a data packet to transmit, to determine from the signalling wavelength whether the next time slot already contains data packets for the destination station and, if so, to avoid data collision by not transmitting its own data packet. The terminal station then determines a free wavelength (.lambda.
q) from the signalling wavelength (.lambda. 0) modulates the free wavelength with the data packet it is to transmit, and modifies the signalling wavelength.
CA002239913A 1994-01-26 1995-01-26 Wdm network with control wavelength Expired - Fee Related CA2239913C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9401488.3 1994-01-26
GB9401488A GB9401488D0 (en) 1994-01-26 1994-01-26 Optical communications
CA002181811A CA2181811C (en) 1994-01-26 1995-01-26 Wdm network with control wavelength

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002181811A Division CA2181811C (en) 1994-01-26 1995-01-26 Wdm network with control wavelength

Publications (2)

Publication Number Publication Date
CA2239913A1 true CA2239913A1 (en) 1995-08-03
CA2239913C CA2239913C (en) 2000-10-24

Family

ID=25678574

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002239913A Expired - Fee Related CA2239913C (en) 1994-01-26 1995-01-26 Wdm network with control wavelength

Country Status (1)

Country Link
CA (1) CA2239913C (en)

Also Published As

Publication number Publication date
CA2239913C (en) 2000-10-24

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