Method for compensating chromatic dispersion and associated equipment

摘要

A method and device for compensating, within a node of an optical network, chromatic dispersion undergone by optical packets transmitted within time slots of wavelength division multiplexed channels along at least one link of the optical network, a time slot duration corresponding to the sum of a packet duration and an inter-packet gap duration. The method and device demultiplexes the wavelength division multiplexed channels into a plurality of bands, and transmits the bands, via a respective plurality of delay lines having predetermined delays, toward a respective plurality of packet add/drop structures comprising a coherent receiver.

主权项

1. A method for compensating, within a node of an optical network, chromatic dispersion undergone by optical packets transmitted within time slots of wavelength division multiplexed channels along at least one link of the optical network, a time slot duration corresponding to the sum of a packet duration and an inter-packet gap duration, the said method comprising the followings steps:
demultiplexing the wavelength division multiplexed channels into a plurality of bands, a band comprising a predetermined number of adjacent wavelength channels, transmitting the said plurality of bands, via a respective plurality of delay lines having predetermined delays, toward a respective plurality of packet add/drop structures comprising a coherent receiver, wherein the said predetermined number of channels of one band is determined so that a first time shift, due to the effect of the chromatic dispersion along transmission through the network, between two optical packets of the same time slot sent respectively in different channels of the same band, remains shorter than an inter-packet gap duration and so that the coherent receiver is capable of processing the said predetermined number of channels of one band, wherein the predetermined delay of a delay line associated with a band of channels corresponds to a second time shift between a channel of the said associated band and a reference channel, the said second time shift being due to the effects of chromatic dispersion along the last crossed link.