| Summary: | In this paper, dual L defected hexagonal Photonic Crystal Ring Resonator (PCRR) using Channel Drop Filter (CDF) is designed for Coarse Wavelength Division Multiplexing (CWDM) systems. In this structure, the external rods of the ring resonator are arranged in a hexagon and the internal rods are removed in L arrangement for introducing defects. Scatter rods are used to prevent leakage. By using the L defected hexagonal resonator, a multi-channel CDF is designed, which exhibits multiple wavelengths of CWDM (1500 nm–1600 nm) region. In addition, the selection of rod size and the position of rods in the proposed multi-channel CDF are validated by varying the radius of coupling and scattering rods, as well as the position of resonators, respectively. By using plane wave expansion and opti Finite Difference Time Domain (FDTD) method, the electromagnetic wave propagation and the photonic band gap are obtained. Keywords: Channel drop filter, Photonic crystal ring resonator, Coarse wavelength division multiplexing, Finite difference time domain
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