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IQ Skew Tolerance Study of Modified Widely Linear Filter in 400 Gbps PM-16QAM System
Date Issued
01-01-2021
Author(s)
Venktasubramani, Lakshmi Narayanan
Yadav, Rekha
David Koilpillai, R.
Indian Institute of Technology, Madras
Abstract
We study the effect of receiver IQ skew in the 448 Gbps PM-16QAM system employing a joint equalizer for polarization demultiplexing, IQ gain and phase imbalance and carrier recovery with a modified widely linear adaptive filter. Through numerical simulations, we show the performance of the joint equalizer algorithm is within the standard HD-FEC limit of 3.8 x 10-3 BER at an OSNR of 24 dB and skew tolerance upto 70% of symbol duration.