Noise spectral analysis of baseband optical receiver system via the perturbation techniques

The perturbation technique and its approximation method are applied to the analysis of a phase-locked loop used in the clock recovery circuit of an optical receiver system. The detuned situation is considered, and the analysis results are applied to a specific optical receiver system. The phase error variance due to Gaussian, pattern, and shot noise are examined by computer simulation. It is found that as the detuning frequency becomes larger, the phase error variance due to each of these noises also increases