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Photonic Crystal Ring Resonator based Bandpass Filter

In this paper, two dimensional Photonic Crystal square lattice circular ring resonator based Bandpass Filter (BPF) is designed by coupling in-line quasi waveguides and resonant cavity. The output efficiency of the circular ring resonator is investigated by varying size of the cavity. The normalized transmission spectra of circular Photonic Crystal Ring Resonator (PCRR) have been studied by using the Finite Difference Time Domain (FDTD) method. The Photonic Bandgap (PBG) has been calculated by Plane Wave Expansion (PWE) method. The simulation shows 100% transfer efficiency and 25 nm of bandwidth over the range of 1575 nm to 1600 nm. The impact of number of rings in the ring is also studied for determining the output efficiency and bandwidth.