Multilevel optical systems with MLSD receivers insensitive to GVD and PMD

被引:9
作者
Colavolpe, Giulio [1 ,2 ]
Foggi, Tommaso [1 ,2 ]
Forestieri, Enrico [3 ,4 ]
Prati, Giancarlo [3 ,4 ]
机构
[1] Univ Parma, Dipartimento Ingn Informaz, I-43100 Parma, Italy
[2] CNIT Res Unit, I-43100 Parma, Italy
[3] Scuola Super Sant Anna, I-56124 Pisa, Italy
[4] CNIT, Photon Networks Natl Lab, I-56124 Pisa, Italy
关键词
differential encoding; electrical equalization; group velocity dispersion (GVD); intersymbol interference (ISI); maximum-likelihood sequence detection (MLSD); optical transmission systems; phase-shift keying (PSK); polarization mode dispersion (PMD); quadrature amplitude modulation (QAM); Viterbi algorithm (VA);
D O I
10.1109/JLT.2008.917052
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper analyzes optical transmission systems based on high-order modulations such as phase-shift keying signals and quadrature amplitude modulations. When the channel is affected by group velocity dispersion (GVD), polarization mode dispersion (PMD), and phase uncertainties due to the laser phase noise, the optimal receiver processing based on maximum-likelihood sequence detection and its practical implementation through a Viterbi processor is described without a specific constraint on the receiver front end. The implementation issues are then faced, showing that at least a couple of widely known front ends, with proper modifications, can be used to extract the required sufficient statistics from the received signal. The aspects related to the receiver adaptivity, the complexity reduction of the Viterbi processor, and the possibility of employing polarization diversity at the transmitter end are also discussed. It is demonstrated that, as long as a sufficient number of Viterbi processor trellis states is employed, GVD and PMD entail no performance degradation with respect to the case of no channel distortions (the back-to-back case).
引用
收藏
页码:1263 / 1273
页数:11
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