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  • Title: Dramatic size reduction of waveguide bends on a micron-scale silicon photonic platform.
    Author: Cherchi M, Ylinen S, Harjanne M, Kapulainen M, Aalto T.
    Journal: Opt Express; 2013 Jul 29; 21(15):17814-23. PubMed ID: 23938654.
    Abstract:
    We demonstrate theoretically and experimentally how highly multimodal high index contrast waveguides with micron-scale cores can be bent, on an ultra-broad band of operation, with bending radii below 10 µm and losses for the fundamental mode below 0.02 dB/90°. The bends have been designed based on the Euler spiral and fabricated on 4 µm thick SOI. The proposed approach enabled also the realization of 180° bends with 1.27 µm effective radii and 0.09 dB loss, which are the smallest low-loss bends ever reported for an optical waveguide. These results pave the way for unprecedented integration density in most semiconductor platforms.
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