Google Inc.

Stefano Lorenzotti

Marco Romagnoli

Luciano Socci

Silvia Ghidini

Paola Galli

Marco Piazza

Lorenzo Bolla

Gaia Cevini

An optical mode transformer comprises a first waveguide including a first core, a first cladding and an end facet configured to be coupled to an optical fiber. The transformer further includes a second waveguide comprising a second core, a second cladding and an end directly coupled to an end of the first waveguide. A third waveguide comprises a third core and a third cladding, and is arranged with respect to the second waveguide so as to realize an evanescent optical coupling with the second waveguide. The third core includes a tapered region wherein evanescent coupling takes place, and wherein a refractive index contrast of the first waveguide is less than a refractive index contrast of the second waveguide, the refractive index contrast of the second waveguide is less than a refractive index contrast of the third waveguide, and the refractive index contrast of the third waveguide is not less than 18%.

Optical mode transformer, in particular for coupling an optical fiber and a high-index contrast waveguide

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Milan, Italy

Stefano Lorenzotti