The impact and mitigation of non-linear effects in coherent optical transmission

Coherent systems are very disruptive, beyond the transponder design. • Promising for enhancing the tolerance to linear impairments Excellent tolerance to OSNR Extremely large tolerance to Chromatic Dispersion Unmatched tolerance to PMD • BUT with weak tolerance to nonlinear impairments with 40Gb/s PDM QPSK More promising at 100Gb/s PDM QPSK