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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:

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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.

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1.
W. Shieh and K. Ho, "Equalization-enhanced phase noise for coherent-detection systems using electronic digital signal processing", Opt. Express, vol. 16, no. 20, pp. 15718-15727, 2008.
2.
C. Xie, "Local oscillator phase noise induced penalties in optical coherent detection systems using electronic chromatic dispersion compensation", Opt. Fiber Commun. Conf. Nat. Fiber Optic Engineers Conf., 2009.
3.
I. Fatadin and S. J. Savory, "Impact of phase to amplitude noise conversion in coherent optical systems with digital dispersion compensation", Opt. Express, vol. 18, no. 15, pp. 16273-16278, 2010.
4.
A. Kakkar et al., "Comprehensive study of equalization-enhanced phase noise in coherent optical systems", J. Lightw. Technol., vol. 33, no. 23, pp. 4834-4841, Dec. 2015.
5.
G. Colavolpe, T. Foggi, E. Forestieri and M. Secondini, "Impact of phase noise and compensation techniques in coherent optical systems", J. Lightw. Technol., vol. 29, no. 18, pp. 2790-2800, Sep. 2011.
6.
X. Zhou and L. Nelson, "Advanced DSP for 400 Gb/s and beyond optical networks", J. Lightw. Technol., vol. 32, no. 16, pp. 2716-2725, Aug. 2014.
7.
R. Farhoudi, A. Ghazisaeidi and L. A. Rusch, "Performance of carrier phase recovery for electronically dispersion compensated coherent systems", Opt. Express, vol. 20, no. 24, pp. 26568-26582, 2012.
8.
R. Farhoudi, A. Ghazisaeidi and L. A. Rusch, "Analytical PDF of decision statistic for coherent MPSK with electronic dispersion equalization", Nat. Fiber Optic Engineers Conf., 2012.
9.
T. Pfau, S. Hoffmann and R. Noé, " Hardware-efficient coherent digital receiver concept with feedforward carrier recovery for \$M\$ -QAM constellations ", J. Lightw. Technol., vol. 27, no. 8, pp. 989-999, Apr. 2009.
10.
A. Ghazisaeidi et al., "Advanced C+L-band transoceanic transmission systems based on probabilistically shaped PDM-64QAM", J. Lightw. Technol., vol. 35, no. 7, pp. 1291-1299, Apr. 2017.
11.
O. Ait Sab et al., "376 Pb/sxkm transmission record over 13419 km Using TPCS-64QAM and C-band EDFA-only", Asia Commun. Photon. Conf., 2017.

References

References is not available for this document.