  We revisit the analysis of equalization-enhanced phase noise (EEPN) arising
in coherent receivers from the interaction between the chromatic dispersion
compensation by an electronic equalizer and the phase noise of the local
oscillator. Through numerical simulations we highlight EEPN characteristics and
investigate its impact on the behavior of the carrier phase recovery algorithm.
We show that the blind phase search, which is usually used in practice to
recover the carrier phase, partially mitigates the EEPN. We detail a numerical
approach to predict the system performance including the phase recovery
algorithm, and show that taking into account EEPN characteristics relaxes the
constraint on the system laser phase noise given by previous pessimistic
analytical models. We present experimental validations of our claims, and
address future advanced transoceanic systems using 98 GBd probabilistically
shaped QAM formats.
