In this paper, we propose a nonlinear single-mode fiber FP cavity, in which CRDS is researched theoretically, and the
relationship expression between output electric field amplitude and nonlinear phase shift is derived. Numerical results
demonstrate that the output performance of nonlinear single-mode fiber Fabry–Perot cavity includes three phases:
build-up, stability, and ring-down phase, output power is inversely proportional to the power in the cavity, when the
power in cavity is larger than 2W, the stable time for output signal with instability becomes longer, but the effect of
self-phase modulation on CRD time is ignoring.