nonlinear amplifier

A physicist has shared a plot showing the reflection coefficient of a nonlinear amplifier under a large incident signal, plotted as a function of phase, noting that the behavior looks far from tame. The reaction, even from the researcher, is that the system's response is strikingly complicated. The point being made is that beyond leading-order effects, there is still much to learn and understand about how such amplifiers behave at high signal levels.