CUTOFF WAVELENGTH MEASUREMENTS OF TILINBO3 CHANNEL WAVE-GUIDES

One of the most important parameters in characterization of integrated optical devices is precise determination of the effective cut-off wav elength of the fundamental and first-order modes, since this sets the exact region of single-mode operation. This paper describes an experim ental set-up for determination of cut-off wavelengths of integrated op tical waveguides, using the technique of spectral light transmission. Measurement results obtained with Ti:LiNbO3 channel waveguides are pre sented for straight waveguides, bent waveguides and polarizers.