Paper Title
Direct Detection of Optical BPSK/QAM Signal without Digital Signal Processing

We experimentally demonstrate the coherent detection of optical BPSK/QAM signals by direct phase compensation of the phase noise without using a sophisticated digital signal processing algorithm. The phase compensation is achieved by applying simply an error signal to a phase modulator located at the local oscillator for coherent detection, where the error signal is generated to keep the same power level for binary/quadrature signals. Indexterms - Phase Noise, BPSK, QAM, Coherent Detection, Coherent Optical Communication.