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In this paper,we propose a four channel Dense Wavelength DivisionMultiplexing demultiplexer with two dimensional photonic crystal squareresonant cavity that fulfill the ITU-T recommendation of G.694.1 DWDMsystems.DWDM demultiplexer consists of a waveguide and Microscopic SquareResonant (MSR) cavity to enable filtering of the desired wavelength. The MSRcavity design has inner rods, outer rods and coupling rods. As the radius ofthe inner rod in MSR cavity changes, the cavity has the ability to filterdifferent ITU.T G.6941 standard wavelengths like 1555.3 nm, 1555.5 nm, 1555.7nm, and 1555.9 nm with 0.2 nm / 25 GHz channel spacing. From the simulation ofvarious wavelengths, helps achievement of the quality factor of 8000, uniformspectral linewidth of 0.2 nm, transmission efficiency of 100 %, crosstalk of-42 dB and footprint is about 395 micro meter square.

Optimization of Dense Wavelength Division Multiplexing demultiplexer with 25GHz uniform channel spacing