Title :
Compensation of coherent DQPSK receiver imperfections
Author :
Roudas, I. ; Sauer, M. ; Hurley, J. ; Mauro, Y. ; Raghavan, S.
Author_Institution :
Patras Univ., Patras
Abstract :
This paper studies the impact of imperfections and impairments on the performance of a coherent phase-diversity DQPSK receiver. Experiments demonstrate that quadrature imbalance can be corrected by ellipse fitting and Gram-Schmidt-like orthogonalization. In addition, it is shown that intermediate frequency offset can be estimated using low complexity, feed-forward, least-square-error based algorithms.
Keywords :
differential phase shift keying; least squares approximations; optical fibre communication; optical receivers; quadrature phase shift keying; DQPSK receiver; Gram-Schmidt-like orthogonalization; coherent receiver; ellipse fitting; feed-forward algorithm; intermediate frequency offset; least-square-error based algorithm; long-haul optical communication; low complexity algorithm; phase-diversity receiver; quadrature imbalance; receiver imperfections; Frequency estimation; Optical attenuators; Optical fiber polarization; Optical filters; Optical interferometry; Optical receivers; Optical signal processing; Optical transmitters; Optical variables control; Photoconductivity;
Conference_Titel :
IEEE/LEOS Summer Topical Meetings, 2007 Digest of the
Conference_Location :
Portland, OR
Print_ISBN :
1-4244-0926-8
Electronic_ISBN :
1099-4742
DOI :
10.1109/LEOSST.2007.4288310
