Association analysis of nonlinear saturation characteristics based on high-speed and high-output photodetectors

With the development of optical communication system, the nonlinear saturation characteristics of photodetectors are necessary to consider. We observed the 1-dB compression current as DC photocurrent saturation point under high power illumination in PIN-PDs. Meanwhile, a new method of measuring AC saturated output power in the time domain is proposed. The quantitative relationship between DC saturation point and AC saturation point is given.