PSK Homodyne Experiment using a DFB Laser at 1.3 μm

Abstract

We report an experimental investigation on the use of a distributed feedback (DFB) semiconductor laser and a lithium niobate waveguide phase modulator, in a PSK homodyne scheme at 1.3 μπα. We use two optical receivers to reduce the local oscillator excess noise and to improve the detection sensitivity. The error rates show floors which are attributed to the phase noise of the laser diode.