Theoretical and experimental studies on active Y-junctions in optical waveguides

Theoretical and experimental results are presented on single-mode Y -junction switching devices in Ti-diffused LiNbO 3 waveguides. The operation of these devices relies on a redistribution, by means of the elcctrooptic effect, of the power in the input waveguide before it is transmitted to the output waveguides of the Y -junction. Measured performance is shown to be predicted satisfactorily by a theoretical model of a Y -junction in homogeneous, planar waveguide. Transmission losses of less than 1 dB and extinction ratios of about 15 dB have been obtained in a device with a junction half-angle of 0.57°.

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