Abstract-We have designed and fabricated an out-of-plane coupler for butt-coupling from fiber to compact planar waveguides. The coupler is based on a short second-order grating or photonic crystal, etched in a waveguide with a low-index oxide cladding. The coupler is optimized using mode expansion-based simulations. Simulations using a 2-D model show that up to 74% coupling efficiency between single-mode fiber and a 240-nm-thick GaAs-AlO waveguide is possible. We have measured 19% coupling efficiency on test structures.Index Terms-Integrated optics, optical planar waveguide components, waveguide coupler.

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Abstract-In this paper, we have demonstrated the feasibility of a photonic integrated circuit for phase control at a wavelength of 1.06 m in an optical phased array telescope antenna system. Index Terms-1.06 m, phase modulation, photonic integrated circuit.

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