Abstract:Abstract.A new procedure is proposed for estimating the State-of-Polansation of the received optical signal in FourQuadrature Amplitude Modulation systems. The proposed solution, which is obtained on the basis of the Maximum Likelihood criterion, is merely electronic and operates in the presence of laser phase noise, photodetection noise and crosspolarisation interference. It employs a suitably designed training sequence to estimate Jones' parameters in the data-aided training mode. A proper decision-directed … Show more
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