Abstract
Current chromatic dispersion compensation algorithms use frequency-domain equalization for efficient filtering. Nonetheless it is one of the most power-hungry blocks of the digital signal processing chain for high baud rate and/or long haul transmission systems. The computational complexity of frequency-domain compensation algorithms is dominated by two fast Fourier transforms for high values of accumulated dispersion. In this article we propose a discrete-time filtering strategy called chirp chromatic dispersion compensation that can be efficiently computed using one single fast Fourier transform. A thorough mathematical description of the method is presented, showing the considered approximations and possible limitations of the new technique. Experimental results indicate that chirp filtering achieves equivalent performance as the frequency-domain technique with overlap-save reconstruction for 32-GBd polarization-multiplexed QPSK and 16 QAM signals at potentially half the complexity if the minimum overlap is respected.
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