Linear transmission spectra and bistable behaviors of channel drop filter based on photonic crystal ring-like resonators

摘要

We have proposed channel drop filters based on a combination of Fabry-Perot (F-P) resonators in a two-dimensional photonic crystal with a triangular lattice of air holes. Firstly we consider a ring resonator where two waveguide F-P resonators are directly connected and have a backward-dropping efficiency of 75 at resonance. Next by tuning the separation and the radii of air holes between F-P resonators as well as the length of F-P waveguides, we can selectively improve the filter characteristics and obtain a forward-dropping efficiency of 95 and a backward-dropping efficiency of 90 at desired resonance frequencies. Moreover we investigate the dependence of optical bistability on the initial detuning when an intense optical pulse is incident into a channel drop filter consisting of highly nonlinear dielectric.