Introduction Currently some of important purposes of researchers in the field of optical electronics and photonics, are design of photonic crystal (PCs) devices. High transmission efficiencies, acceptable quality factors and low FWHM are important characteristics of proposed filter.ġ. The simulation results confirm the normalized output transmission efficiencies, quality factors (Q) and Full Width at Half Maximum (FWHM) for desired BPF are equal to about 99%, 497 and 3 nm (for 1491 nm) and nearly 100%, 310.2 and 5 nm (for 1551 nm), respectively. The normalized transmission spectra simulations and the Photonic Band Gap (PBG) calculations for the desired filter are done using two-dimensional finite-difference time-domain (2D-FDTD) and Plane Wave Expansion (PWE) methods, respectively. The desired BPF is composed of a 20×19 square lattice of dielectric rods using semiconductor InAs rods.
It is centred at wavelengths of 1491 nm and 1551 nm with the aim of minimum attenuation. In this paper, a simple and non-complex structure for an optical double Bandpass Filter (BPF) based on two-dimensional (2D) Photonic Crystal Ring Resonators (PCRRs) is suggested for ITU-T G.694.2 8-channel Coarse Wavelength Division Multiplexing (CWDM) optical systems.
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