Effect of partially coherent laser source on the performance of fiber-coupling DPSK receiver for optical communication

摘要

In practice, due to the reasons related to the laser device and the inevitable error of the processing technique, a laser source emitted from a communication terminal is represented by partially coherent laser source. The fiber-coupling efficiency and the incident optical power at the receiver aperture are affected by the source coherent parameter zeta through atmospheric turbulence. In this paper, the statistical distribution of both the fiber-coupling efficiency and the incident optical power are given, based on which the effect of the source coherent parameter zeta on the performance of fiber-coupling differential phase-shift keying (DPSK) receiver is systematically analyzed. The system fade margin, the average bit error rate (BER) and the power penalty are obtained in the presence of the degradation of the source coherent degree. The results manifest that the performance of fiber-coupling DPSK receiver system degrades drastically with increasing source coherent parameter zeta. The hope of this work is to improve the redundancy design of fiber-coupling DPSK receiver system. (C) 2015 Elsevier B.V. All rights reserved.