Robust Multilevel Coherent Optical Systems With Linear Processing at the Receiver

This paper investigates optical coherent systems based on polarization multiplexing and high-order modulations such as phase-shift keying (PSK) signals and quadrature amplitude modulations (QAM). It is shown that a simple linear receiver processing is sufficient to perfectly demultiplex the two tran...

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Bibliographic Details
Published in:Journal of lightwave technology 2009-07, Vol.27 (13), p.2357-2369
Main Authors: Colavolpe, G., Foggi, T., Forestieri, E., Prati, G.
Format: Article
Language:English
Subjects:
Channels
Coherence
Complexity
Detectors
Dispersions
Electrical equalization
group velocity dispersion (GVD)
intersymbol interference (ISI)
Laser feedback
optical coherent transmission systems
Optical feedback
Optical modulation
Optical polarization
Optical receivers
Optical transmitters
Phase shift keying
phase-shift keying (PSK)
Polarization
Polarization mode dispersion
polarization mode dispersion (PMD)
Quadrature amplitude modulation
quadrature amplitude modulation (QAM)
Receivers
Robustness
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Summary:This paper investigates optical coherent systems based on polarization multiplexing and high-order modulations such as phase-shift keying (PSK) signals and quadrature amplitude modulations (QAM). It is shown that a simple linear receiver processing is sufficient to perfectly demultiplex the two transmitted streams and to perfectly compensate for group velocity dispersion (GVD) and polarization mode dispersion (PMD). In addition, in the presence of a strong phase noise of the lasers at the transmitter and receiver, a symbol-by-symbol detector with decision feedback is able to considerably improve the receiver robustness with a limited complexity increase. We will also discuss the channel estimation and the receiver adaptivity to time-varying channel conditions as well as the problem of the frequency acquisition and tracking. Finally, a new two-dimensional (polarization/time) differential encoding rule is proposed to overcome a polarization-ambiguity problem. In the numerical results, the receiver performance will be assessed versus the receiver complexity.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2008.2008821