This analytical modeling-and-simulation paper presents a compact passive photonic filter using Mach-Zehnder Interferometer (MZI) on silicon-on-insulator (SOI) platform. MZI based wavelength filters have been demonstrated for broadband wavelength-division-multiplexing (WDM). The imbalance in MZI provides means to control the free spectral range (FSR) hence enabling designing of a photonic filter that can pass the required band and block the rest of the signal. Low loss Y-splitter/combiner are used with very small footprint to make compact size MZI. A 3D Finite-Difference Time-Domain (FDTD) simulation is performed on our design. FSR value of 50 nm was observed in the span of 100 nm wavelength range centered on 1.55 μm. The footprint of the designed filter is 15 μm x 20 μm.
We propose a novel compact structure with EIT-like spectrum by introducing two partial reflectors (silica holes) symmetrically placed within the microring resonator (MRR). The two Fabry-Pérot (FP) resonating cavities created by the silica holes, coupled with microring’s resonance modes, show EIT-like lineshapes spaced by free spectral range of MRR. The FWHM of EIT-like spectrum can be controlled by tuning the radii of the silica holes. Analytical results from the developed mathematical model and 3D FDTD simulations were found to be in good agreement with each other.
Distributed meandering waveguide based fiber optic components are introduced, categorized, and numerically analyzed in the near-infrared. The building block of all meandering waveguide components is the meandering loop mirror. The other components are the meandering resonator, meandering distributed feedback structure, symmetric and antisymmetric meandering resonator, symmetric and antisymmetric meandering distributed feedback structures giving rise to transmission spectra with Lorentzian, Rabi, Fano, coupled resonator induced transparency, and winged Lorentzian lineshapes. With this variety of spectral responses, distributed meandering waveguide fiber optic components are suitable as filters, and delay line elements in fiber optic communication, and as sensor elements in fiber optic diagnostics.
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