Complete and Low-Complexity Frequency-Dependent IQ Crosstalk Compensation for High-Baud-Rate Coherent Optical Transceiver

We propose a complete and low-complexity compensation scheme for frequency-dependent crosstalk of adjacent channels in high-baud-rate coherent optical transceivers. Through an accurate estimate of the crosstalk curve, the BER of a 64 GBaud PDM-16QAM experiment is improved from 4.09e-3 to 7.70e-4 by only a low-complexity
$2\times 2$
algorithm.