High efficiency diffractive grating couplers for interfacing a single mode optical fiber with a nanophotonic silicon-on-insulator waveguide circuit
- 31 March 2008
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 92 (13) , 131101
- https://doi.org/10.1063/1.2905260
Abstract
High efficiency diffractivegratingstructures to interface a single mode optical fiber and a nanophotonic integrated circuit fabricated on silicon-on-insulator are presented. The diffractivegratingstructures are designed to be inherently very directional by adding a silicon overlay before grating definition. 55% coupling efficiency at a wavelength of 1.53 μ m is experimentally demonstrated on devices fabricated using standard complementary metal-oxide semiconductor technology. By optimizing the grating parameters, we theoretically show that 80% grating coupling efficiency can be obtained for a uniform gratingstructure.Keywords
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