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Photonic crystal based narrowband optical filter: A brief analysis
M. M, , S.R. A, E.M. K
Published in Elsevier GmbH
Volume: 228
In this paper, for a narrow band filter function, a two-dimensional photonic crystal with a hexagonal-shaped resonator has been proposed. The filter design consists of a 2D hexagonal lattice with silica rods (dielectric) placed in the air (substrate) with a lattice constant of 0.65 μm and rod radius of 0.25 μm produced on a wafer of size 10 μm * 13 μm. The filter is made up of a bus waveguide, dropping waveguide and a photonic crystal ring resonator (PCRR) by introducing defects in the crystalline edifice. The optimization is carried in the structure over the entire C band using the finite difference time domain (FDTD) method. And the performance of the designed structure can be calculated with the parameters like transmission efficiency and Q-factor. For the proposed edifice the transmission efficiency and Q-factor are 87 % and 389 at resonance wavelength 1556 nm, 80 % and 782 at resonance wavelength 1564 nm. The optimized filter provides a narrowband transmission suitable for DWDM applications to design multiplexers and de-multiplexers that obtains higher capacities in optical fiber for current as well as future demands. © 2020 Elsevier GmbH
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