Abstract
Reduction of the radiation loss is essential for the design of integrated-optic devices involving bent waveguides. For wavelength-selective waveguide devices requiring accurate phase control, the effect of bending-induced phase-constant change becomes even more important. The vector-wave mode-matching method is extended for the analysis of both loss and phase characteristics for general integrated-optic bent channel waveguides. For a typical Mach-Zehnder interferometric filter in silica-glass waveguide, the calculated phase-constant change is used in the waveguide path-length compensation which results in excellent agreement between design and measurement.
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