Performance analysis of direct-detection optical DPSK systems using a dual-detector optical receiver

Abstract

In this paper, the performance of a direct detection optical DPSK systems using a dual detector receiver is analysed. The filtering effects on the intensity noise, resulting from the interferometric conversion of laser phase noise, are also investigated. Linewidth requirements are estimated and compared with that of heterodyne DPSK systems. It is shown that linewidth requirements can be relaxed by a factor of about 0.58, when filtering effects are taken into account.