Optical propagation losses and coupling losses in Ti-diffused strip waveguides, fabricated in y-plate and z-plate LiNbO3, have been examined at 1.15-μm wavelength. Propagation losses for y-plate and z-plate waveguides are ~0.5 dB/cm. Coupling losses in the y-plate and z-plate waveguides for a single-mode fiber are 2.5 and 1 dB, respectively. This difference is due to the large surface diffusion anisotropy; it is expressed by near-field pattern overlap calculations.
© 1980 Optical Society of America
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