Two dimensional photonic crystal ring resonator based Bandpass Filter for C-Band of CWDM applications

A two Dimensional Photonic Crystal based Bandpass Filter (2D-PCBPF) is proposed for C-Band of CWDM applications. It is designed with two quasi waveguides and a circular Photonic Crystal Ring Resonator (PCRR). The simulation results are obtained using 2D Finite Difference Time Domain (FDTD) method. The Photonic Bandgap (PBG) is calculated by Plane Wave Expansion (PWE) method. The proposed PCBPF is covered the entire C-Band, which extends from 1530 nm to 1565 nm. Close to 100% output efficiency is observed for the wavelength ranging from 1536 nm to 1558 nm through this simulation with 32 nm of (Full Width Half Maximum) bandwidth. The size of the device is drastically reduced from a scale of few tens of millimeters to the order of micrometers. The overall size of the proposed PCBPF is around 13 μm × 11.5 μm.