تحسين اداء الاتصالات الضوئية المترابطة باستخدام الهزازات الليزرية

Our paper contains a study of the effects of polarization control and amplifiers on the performance of the coherent detection optical systems. It also offers a new definition of the block diagram of the coherent system. Mathematical analyses and simulation of coherent system show that: coherent optical communication systems potentially offer improved receiver sensitivity and channel selectivity over direct-detection techniques. the optical power incident on the photodetector is a function of the polarization misalignment between the signal wave and local oscillator wave. To achieve a high degree of fidelity in the recovered signal, this term should remain constant and equal to one. Thus, polarization control is necessary. the amplifiers have negative effects on the signal to noise ratio (SNR), thus, local laser oscillator is alternative solution.