PHASE COMPENSATION OF BENT SILICA-GLASS OPTICAL CHANNEL WAVE-GUIDE DEVICES BY VECTOR-WAVE MODE-MATCHING METHOD

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