1305.4201 (Stefano Olivares et al.)

Homodyne detection as a near-optimum receiver for phase-shift keyed
binary communication in the presence of phase diffusion    [PDF]

Stefano Olivares, Simone Cialdi, Fabrizio Castelli, Matteo G. A. Paris

We address binary optical communication channels based on phase-shift keyed coherent signals in the presence of phase diffusion. We prove theoretically and demonstrate experimentally that a discrimination strategy based on homodyne detection is robust against this kind of noise for any value of the channel energy. Moreover, we find that homodyne receiver beats the performance of Kennedy receiver as the signal energy increases, and achieves the Helstrom bound in the limit of large noise.

View original: http://arxiv.org/abs/1305.4201