Abstract
This paper proposes optimal finite-length impulse response (FIR) digital filters, in the least-squares
(LS) sense, for compensation of chromatic dispersion (CD) in digital coherent optical receivers. The proposed filters
are based on the convex minimization of the energy of the complex error between the frequency responses of the actual
CD compensation filter and the ideal CD compensation filter. The paper utilizes the fact that pulse shaping filters
limit the effective bandwidth of the signal. Then, the filter design for CD compensation needs to be performed over a
smaller frequency range, as compared to the whole frequency band in the existing CD compensation methods. By means of
design examples, we show that our proposed optimal LS FIR CD compensation filters outperform the existing filters in
terms of performance, implementation complexity, and delay.
© 2014 IEEE
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