1989•Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIERequires access
N Integrated Optical Bragg-Cell With Tapered Waveguides In Lithium Niobate
W. Konz, Wulf Lotze, D. Dolde, Helmut F. Schlaak
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Abstract
A Bragg-modulator on lithium niobate substrate (z-cut, y-cut) for x= 840 nm operated at 300 MHz has been fabricated. It is realized using two crossed tapered waveguides and an interdigital transducer to convert the high frequency electrical power to a surface acoustic wave (SAW). The monomode waveguide is tapered adiabatically into a width of 50 pm, which provides an interaction length of 3.2 mm. For reasons of low crosstalk the Bragg-angle is chosen to be θ B = 0.9°. Because of the need for the large acoustic aperture of 3.2 mm in some cases a special interdigital electrode transducer (ITD) for surface acoustic wave generation, the so called "dog leg" ITD is used. The deflected light intensity was measured to be up to 40% of the non-deflected intensity for y-cut and 15% for z-cut lithium niobate at an electrical power of 800 mW. The static optical crosstalk with coupled fiber is better than -32 dB.