Improvements in, or relating to, optical communications

H - Electricity – 04 – L

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H04L 25/03 (2006.01) H04B 10/155 (2006.01) H04B 10/18 (2006.01) H04L 27/22 (2006.01)

Patent

CA 2432007

A method of transmitting a plurality n data streams comprises modulating an optical carrier using differential M-ary phase shift key (DMPSK) signalling in which M=2n.. Advantageously the method comprises using differential quaternary phase shift keying in which n=2. A particular advantage of the method of the present invention is that since the the data is differentially encoded in the form of phase changes rather than absolute phase values this enables the modulated optical carrier to be demolutated using direct detection without requiring a phase-locked local optical oscillator.The invention is particularly applicable to WDM communication systems.

L'invention concerne un procédé d'émission de n flux de données consistant à moduler une porteuse optique en utilisant une signalisation par modulation de phase différentielle M-aire (DMPSK) dans laquelle M=2?n.¿. Ce procédé consiste, de façon avantageuse, à utiliser une modulation de phase différentielle quaternaire dans laquelle n=2 (DQPSK). Un avantage particulier de ce procédé réside dans le fait que puisque les données sont codées de façon différentielle sous la forme de changements de phase plutôt que de valeurs de phase absolues, la porteuse optique modulée peut être démodulée par utilisation de détection directe sans la présence d'un oscillateur optique local à verrouillage de phase. L'invention s'applique particulièrement à des systèmes de communication à multiplexage en longueur d'ondes (WDM).

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