Open AccessImpact of phase to amplitude noise conversion in coherent optical systems with digital dispersion compensation
Author(s) -
Irshaad Fatadin,
Seb J. Savory
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.016273
Subject(s) - phase noise , quadrature amplitude modulation , optics , qam , noise (video) , dispersion (optics) , laser linewidth , phase modulation , phase shift keying , physics , quantum noise , symbol rate , amplitude , amplitude modulation , transmission (telecommunications) , phase (matter) , modulation (music) , telecommunications , bit error rate , computer science , acoustics , frequency modulation , bandwidth (computing) , laser , channel (broadcasting) , quantum mechanics , artificial intelligence , image (mathematics) , quantum
The impact of phase to amplitude noise conversion for QPSK, 16-QAM, and 64-QAM coherent optical systems are investigated with electronically-compensated chromatic dispersion (CD). The electronic equalizer is shown to convert the phase noise from the local oscillator (LO) to amplitude noise, limiting the amount of CD that can ideally be compensated digitally. The simulation results demonstrate that the performance of coherent systems can significantly be degraded with digitally compensated CD and LO phase noise. The maximum tolerable LO linewidth is also investigated for the different modulation formats and found to become increasingly stringent for longer transmission distance and higher symbol rate.