Layered tapered optical transition

Abstract

Light can be input into a coupling region of a first waveguide of a photonic device. The light from the first waveguide is coupled to a second waveguide, where the first waveguide has a narrowing taper that couples the light to a widening taper of the second waveguide. The first waveguide can be in a first layer of the photonic device, the second waveguide being in an adjacent second layer. The light from the second waveguide can be coupled to a third layer of the photonic device, the third layer being adjacent to the first layer such that the second layer and the third layer are separated from the first layer. The second waveguide has a narrowing taper that couples the light to the third layer. The third layer outputs the light from the coupling region.

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