1 June 2015 SiN-assisted polarization-insensitive multicore fiber to silicon photonics interface
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Abstract
We demonstrate a polarization-insensitive coupler interfacing multicore-fiber (MCF) to silicon waveguides. It comprises a 3D glass fanout transforming the circular MCF core-arrangement to linear and performing initial tapering, followed by a Spot-Size-Converter on the silicon chip. Glass waveguides are formed of multiple overlapped modification elements and appropriate offsetting thereof yields tapers with symmetric cross-section. The Spot-Size-Converter is an inverselytapered silicon waveguide with a tapered polymer overcladding where light is initially coupled, whereas phase-matching gradually shifts it towards the silicon core. Co-design of the glass fanout and Spot-Size-Converter obtains theoretical loss below 1dB for the overall Si-to-MCF transition in both polarizations.
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Giannis N. Poulopoulos, Dimitrios Kalavrouziotis, Paul Mitchell, John R. Macdonald, Paraskevas Bakopoulos, Hercules Avramopoulos, "SiN-assisted polarization-insensitive multicore fiber to silicon photonics interface", Proc. SPIE 9520, Integrated Photonics: Materials, Devices, and Applications III, 95200E (1 June 2015); doi: 10.1117/12.2179077; https://doi.org/10.1117/12.2179077
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