We report an improved self-homodyne detection scheme for differential phase-shift-keying that achieves close to homodyne performance and effectively reduces the influence of nonlinear phase noise, resulting in a 1.3dB sensitivity improvement over self-homodyne detection.

We present a new protocol for quantum key distribution using discrete phase-shift encoding with continuous variables. The novelty of the protocol is multi letter alphabets represented by coherent states of light with fixed amplitude and variable phase. Information is encoded in the phase of a coherent states which can be chosen from a regular discrete set consisting of an arbitrary number of le...

This paper deals with the modeling and the evaluation of a multiplicative phase noise influence on the bit error ratio in a general space communication system. Our research is focused on systems with multi-state phase shift keying modulation techniques and it turns out, that the phase noise significantly affects the bit error rate, especially for higher signal to noise ratios. These results com...

Jaeyoon Lee et al. 707 In-phase/quadrature (I/Q) imbalances, which are generated by non-ideal transceiver components, are inevitable physical phenomena that cause the performance of practical communication systems to be degraded. In this paper, we provide a new closed-form expression for the bit error rate of hierarchical M-ary phase shift keying with I/Q phase and amplitude imbalances and anal...