Patent ID: 7099597
Filing Date: 2006-08-29
Classification: H04B

Abstract:
1. A method for optimizing quality of a data signal transmitted over an optical WDM network, comprising: generating, at a transmit site, a FEC encoded optical signal, by intensity modulating said data signal over an optical carrier; phase modulating said optical signal with a prechirp signal; transmitting said optical signal from said transmit site to a receive site; recovering said data signal from said optical signal at a receive site; determining a degradation factor indicative of the distortion suffered by said optical signal between said transmit and said receive sites by comprises FEC decoding said optical signal and counting the number of errors corrected in said optical signal; and controlling the amplitude of said prechirp signal with said degradation factor by transmitting said degradation factor from said receive site to said transmit site; processing said degradation factor into a control signal corresponding to an optimal prechirp, wherein said optimal prechirp is determined according to a Q versus prechirp graph provided by measuring the quality factor Q of said optical signal at said receive site for a plurality of given prechirp levels, and selecting said optimal prechirp associated with a maximum Q on said graph; and synchronizing said control signal with said optical signal.