Optical fibre ring resonators: analysis of transient response

The paper investigates the temporal response of a passive fibre optic ring resonator illuminated by an amplitude stabilised single mode pulsed laser light source of frequency ω₀. The output pulse shape is found to depend on the input pulse shape, the ratio of the source coherence time τ_c to the resonator delay time τ, and also the ring resonator phase delay ω₀ τ. Under certain conditions, periodic oscillations in output intensity occur, and the paper provides a simple physical explanation of these in terms of the resonator phase delay