Abstract
We present the results of an experimental study of waveguide tapers realized in LiNbO<sub>3</sub> using the soft-proton-exchange process and the waveguide segmentation
technique. Measurements show that they can be favorably introduced between the nonlinear or electrooptic part of the
components, which require strong mode confinement to increase efficiency, and the coupling section with a standard
optical fiber, which requires low mode confinement in order to have low coupling losses. These tapers allow almost
lossless mode-shape transformation. Preliminary results show that they allow reducing the coupling losses by up to
0.7 dB, thus proving the practical interest of the approach.
© 2007 IEEE
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