Title :
Stop-and-Go Algorithm for Blind Equalization in QAM Single-Carrier Coherent Optical Systems
Author :
Colavolpe, Giulio ; Foggi, Tommaso ; Prati, Giancarlo
Author_Institution :
Dipt. di Ing. dell´´Inf., Univ. of Parma, Parma, Italy
Abstract :
Coherent detection has recently allowed the adoption of high-order modulation formats in single-carrier optical systems where a simple feed-forward equalizer, in proper configuration, is able to perfectly compensate for fiber linear impairments, such as group velocity dispersion and polarization-mode dispersion. In this letter, the blind update of the equalizer taps is investigated with reference to a 16-ary quadrature amplitude modulation (QAM) format in the presence of different channel impairments. A novel algorithm is proposed, which represents an improvement of the stop-and-go, through the use of a powerful asynchronous detection strategy.
Keywords :
blind equalisers; channel estimation; optical fibre dispersion; optical fibre networks; optical fibre polarisation; optical signal detection; quadrature amplitude modulation; QAM single-carrier coherent optical systems; asynchronous detection; blind equalization; fiber channel impairment; group velocity dispersion; polarization-mode dispersion; quadrature amplitude modulation; signal detection; stop-and-go algorithm; Bit error rate; Blind equalizers; Optical polarization; Optical receivers; Phase noise; Quadrature amplitude modulation; Equalization; quadrature amplitude modulation (QAM); signal processing;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2089446
