Photonic crystal based flat-top filter for CWDM channel compatible with ITU-T recommendation G.694.2

In this paper a photonic crystal based band pass filter has been designed to meet ITU-T recommendation G.694.2 for CWDM system, by varying the constitutive materials of the unit cell. The amalgamation of Si
_1-x
Ge
_x
alloy, with Silicon Nitride (Si
₃
N
₄
) has been effectively found compatible as primitive layers of unit cells instead of Si/SiO
₂
pair. Finally CST MW simulated results have been presented, for comparative purpose, to demonstrate the amenities of Si
_1-x
Ge
_x
/Si
₃
N
₄
pair, over Si/SiO
₂
pair, as basis of the photonic crystal.