Title :
Trellis coded polarization shift keying modulation for digital optical communications
Author :
Benedetto, S. ; Olmo, G. ; Poggiolini, P.
Author_Institution :
Dipartimento di Elettronica, Politecnico di Torino, Italy
Abstract :
The application of the well-known technique of trellis coded modulation to coherent optical communications using polarization shift keying (POLSK) is described and analyzed. The resulting receiver is formed by a front-end which performs the heterodyne detection and the Stokes parameter extraction, cascaded with an electronic Viterbi processor operating the maximum likelihood estimate of the transmitted sequence. Results in terms of the error event probability using optimum as well as a simpler suboptimum branch metric show power gains of the order of 3-4 dB, at the expense of a reasonable increase in complexity, only concerning the processing in the electronic domain. These coding gains are not lost even in the presence of high levels of phase noise, to which POLSK in general is highly insensitive.<>
Keywords :
demodulation; digital communication; estimation theory; light coherence; light polarisation; maximum likelihood estimation; optical communication; optical modulation; phase shift keying; trellis coded modulation; Stokes parameter extraction; coding gain; coherent optical communications; digital optical communications; electronic Viterbi processor; error event probability; heterodyne detection; maximum likelihood estimate; optimum branch metric; phase noise; polarization shift keying; power gains; receiver; suboptimum branch metric; transmitted sequence; trellis coded modulation; Digital modulation; Maximum likelihood detection; Maximum likelihood estimation; Modulation coding; Optical fiber communication; Optical modulation; Optical receivers; Polarization shift keying; Stokes parameters; Viterbi algorithm;
Journal_Title :
Communications, IEEE Transactions on
