Noise in Optical Receivers

This lecture covers the different types of noise present in optical receivers, starting with shot noise generated by random electron generation. It explains how shot noise variance is calculated and how dark current contributes to it. The lecture also delves into thermal noise caused by random electron motion in resistors, discussing its power spectral density and variance. It then explores the signal-to-noise ratio for p-i-n diodes, detailing the total noise variance and defining SNR. The presentation concludes by comparing thermal and shot noise limits, discussing noise in APD receivers, and analyzing SNR in APD compared to p-i-n diodes.