The frequency domain equalizers (FDEs) employing two types of overlap-add zero-padding (OLA-ZP) methods are applied to compensate the chromatic dispersion in a 112-Gbit/s non-return-to-zero polarization division multiplexed quadrature phase shift keying (NRZ-PDM-QPSK) coherent optical transmission system. Simulation results demonstrate that the OLA-ZP methods can achieve the same acceptable performance as the overlap-save method. The required minimum overlap (or zero-padding) in the FDE is derived, and the optimum fast Fourier transform length to minimize the computational complexity is also analyzed.
@article{arxiv.1603.00734,
title = {Frequency-Domain Chromatic Dispersion Equalization Using Overlap-Add Methods in Coherent Optical System},
author = {Tianhua Xu and Gunnar Jacobsen and Sergei Popov and Marco Forzati and Jonas Martensson and Marco Mussolin and Jie Li and Ke Wang and Yimo Zhang and Ari T. Friberg},
journal= {arXiv preprint arXiv:1603.00734},
year = {2016}
}