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In this paper, a Photonic Crystal Ring Resonator (PCRR) based demultiplexer is proposed and designed to drop four different channels. The proposed structure is consists of bus waveguide, dropping waveguide and butterfly shaped ring resonator. The demultiplexer performance parameters such as transmission efficiency, dropping efficiency, crosstalk, quality factor and resonant wavelength are investigated for each channel. Initially, the channel drop filter using proposed PCRR is carried out and its extended to drop four different channels by changing the refractive index of each channels that acts as demultiplexer. The designed structure can able to drop four different channels which are 1425 nm, 1445 nm, 1460 nm and 1475 nm. The Plane Wave Expansion (PWE) method is employed to get photonic band gap of the periodic and non-periodic structure. The 2D Finite Difference Time Domain (FDTD) method is utilized to calculate the normalized output spectra of the demultiplexer. The proposed butterfly shaped photonic crystal ring resonator is fulfilling the requirements of WDM systems hence it is highly suitable for WDM applications and Photonic Integrated Circuits.

DESIGN OF TWO DIMENSIONAL PHOTONIC CRYSTAL RING RESONATOR BASED DEMULTIPLEXER