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In this paper we are going to design and simulating a 1 to 8 demultiplexer based on Photonic Crystal (PhC) that where in wavelengths was guided to her coupled cavity and after that our Intended output. This structure is good Selection to communication operations that their wavelengths are around 1550nm. High Q factor, high transmission speed and low crosstalk between wavelengths are the advantages of this structure. The area of this structure is560μm2$560\,{\rm{ \mu }}{{\rm{m}}^{\rm{2}}}$   . The wavelengths was selected to this work are 1602.1 nm, 1598.3 nm, 1595.2 nm, 1591.8 nm, 1588.6 nm, 1585.4 nm, 1582.4 nm, 1579.6 nm. In this paper we are going to prepare the crosstalk between outputs and our main goal is giving low crosstalk between outputs.

Studying Photonics Crystal Cavities by Design and Simulation of a 1 to 8 Optical Demultiplexer