Abstract
A novel type of waveguides utilizing simultaneously Bragg reflection and TIR (total internal reflection) for light confinement is proposed and studied. The BRAGGATIR waveguides combine the advantages of Bragg waveguides and lateral ARROWs (antiresonant reflecting optical waveguides) -- namely, large core sizes allowing easy and low loss fiber coupling and their reduced sensitivity to fabrication errors, with the properties of high index contrast ridge waveguides which tolerate small bending radius. Since the proposed waveguides have only one Fabry-Perot layer, they are more compact compared to the Bragg waveguides. Moreover, the large dispersion of the BRAGGATIR waveguides near the resonances may find applications in optical signal processing. Beam propagation method (BPM) and mode solver numerical simulations were performed and the bending losses of different waveguides, namely BRAGGATIR, ridge and ARROW, were compared for different bending radii down to 10 microns. The results demonstrate advantage of the proposed waveguides allowing very small radius ring resonators with large free spectral range and more compact integrated optics devices.
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