Compact and efficient fiber-to-waveguide grating couplers in InP-membrane

Miniaturization and integration are key drivers for future optical communication networks. Nanophotonic components are very interesting for ultra-dense photonic circuits, but the coupling with the outside world remains an important problem. An attractive solution is provided by grating couplers. In this paper, we present the design and fabrication of compact and efficient grating couplers in InP-membrane, for coupling between nanophotonic waveguides and single mode fiber. A high vertical index contrast is achieved by wafer bonding. First components show a coupling efficiency of 30%.

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