Abstract
In polarization multiplexing based coherent optical transmission, two
main kinds of impairements have to be counter-acted: 1) the inter-symbol interference
generated by the chromatic dispersion and the polarization mode dispersion
and 2) the frequency offset. Usually adaptive approaches are carried out to
mitigate them. Since the channel is very slowly time-varying, we propose to
combat these impairements by using block-wise methods. Therefore, we introduce
two new algorithms: the first one is a block-wise version of blind time equalizer
(such as CMA), and the second one estimates the frequency offset in block-wise
way. These algorithms are suitable for PSK and QAM constellations. By simulation
investigations, we show that they outperform the standard approach in terms
of convergence speed only at a moderate expense of computational load. We
also experimentally evaluate their performance using 8-PSK real data traces
and off-line processing which takes into account other physical impairments
such as phase noise and non-linear effects.
© 2011 IEEE
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