PERIODICALLY SEGMENTED WAVE-GUIDES IN TI-LINBO3

Periodically segmented waveguides with periods of few tens of micromet ers and nonconnected segments are studied experimentally in Ti:LiNbO3. The near-field patterns were found to expand with decreasing duty cyc le but to be independent of the segmentation period. The measured segm entation losses vary between 0.5 and 2.5 dB/cm, depending on the perio d and the duty cycle. These results agree with a simple numerical mode l, based on two loss mechanisms: waveguide segmentation and surface re lief related to Ti indiffusion.