Leakage loss in trench bulge waveguides

M. Krause, H. Renner, A. Harke, Jörg Müller, E. Brinkmeyer,
Leakage loss in trench bulge waveguides
J. Lightwave Technol. 23(5), pp. 1890-1896 (2005)

Abstract: We show that leakage loss is an important loss mechanism in integrated-optical trench bulge waveguides. The propagation losses due to leakage can easily exceed 1 dB/cm in these waveguide geometries. By simply using a deeper trench or a cavity in the substrate to deposit the waveguide in, the leakage losses can be reduced dramatically.

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