Loading [MathJax]/extensions/MathMenu.js
Equalization Enhanced Phase Noise in Coherent Receivers: DSP-Aware Analysis and Shaped Constellations | IEEE Journals & Magazine | IEEE Xplore

Equalization Enhanced Phase Noise in Coherent Receivers: DSP-Aware Analysis and Shaped Constellations


Abstract:

We revisit the analysis of equalization-enhanced phase noise (EEPN) arising in coherent receivers from the interaction between the chromatic dispersion compensation by an...Show More

Abstract:

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.
Published in: Journal of Lightwave Technology ( Volume: 37, Issue: 20, 15 October 2019)
Page(s): 5282 - 5290
Date of Publication: 29 July 2019

ISSN Information:

Nokia Bell Labs, Paris-Saclay, Nozay, France
Nokia Bell Labs, Paris-Saclay, Nozay, France

I. Introduction

It has been shown that the interaction between the electronic dispersion compensation (EDC) filter and the phase noise of the local oscillator (LO) laser in the coherent receiver generates a noise called equalization enhanced phase noise (EEPN) [1]–[8]. The variance of EEPN at EDC output is computed in [1]. The EEPN-induced constraints on LO linewidth have been experimentally characterized in [2] on quadrature-phase-shift-keying (QPSK) signals, and simulation results in [3] highlighted tighter requirements for higher modulation formats such as 16 and 64QAM.

Nokia Bell Labs, Paris-Saclay, Nozay, France
Nokia Bell Labs, Paris-Saclay, Nozay, France

References

References is not available for this document.