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Efficient packaging in silicon photonics requires a previous development of high performance fiber coupling structures. One of the most suitable fiber coupling structures in silicon is the grating coupler. Main advantages of using such a vertical coupling technique with respect to horizontal techniques are fiber alignment tolerances and wafer scale testing. We report design, fabrication and experimental...
Grating couplers for efficient vertical coupling between sandwiched slot waveguides and standard single-mode fibers are demonstrated. 20% coupling efficiency is experimentally measured. Higher coupling efficiency is expected for particular designs according to simulation results.
Horizontal slot waveguides are becoming a very promising waveguide configuration for silicon photonics nonlinear applications. In this letter, the design of grating couplers for highly efficient coupling between standard single-mode fibers and horizontal slot waveguides is reported. Parameters have been optimized to achieve maximum coupling efficiency for lambda = 1550 nm and transverse magnetic polarization...
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