InP electro-optic directional coupler

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Abstract
An electro-optic directional coupler switch has been fabricated in InP with an homojunction structure. Each single-mode guide is made in a n layer grown on a n+ substrate, the p+ etched rib used to confine the light being obtained by diffusion. A linear variation of the coupling length with reciprocal wavelength has been found between 1.06 and 1.51 μm. By reversely biasing the ’’stepped Δβ’’ junctions with less than 12 V, both switching states have been achieved at 1.51 μm, with a power isolation better than 16 dB on a 8-mm-long device. This is a new promising step towards InP-integrated optics.