Search for: [Description = "A highly selective filter is designed, working at 1.55 μm and having a 3\-dB bandwidth narrower than 0.4 nm, as is required in Dense Wavelength Division Multiplexed systems. Different solutions are proposed, involving photonic crystals made rectangular\- or circular\-section dielectric rods, or else of holes drilled in a dielectric bulk. The polarization and frequency selective properties are achieved by introducing a defect in the periodic structure. The device is studied by using in\-house codes implementing the full\-wave Fourier Modal Method. Practical guidelines about advantages and limits of the investigated solutions are given."]

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