Telefonaktiebolaget Lm Ericsson (publ)

Tommaso Cassese

Francesco Testa

Marco Romagnoli

Luigi Tallone

An optical coupler () comprises a substrate (). A first waveguide element () is provided in a first layer with respect to the substrate, wherein the first waveguide element () comprises a first end () and a second end (), and wherein the first end () of the first waveguide element () is coupled to input/output light to/from a first end of the optical coupler. A second waveguide element () is provided in a second layer, the second layer arranged adjacent to the first layer, wherein the second waveguide element () comprises a first end () and a second end (), and wherein the first end () of the second waveguide element () is coupled to input/output light to/from a second end of the optical coupler. The first waveguide element () is configured to extend from the first end of the optical coupler towards the second end of the optical coupler, and the second waveguide element () is configured to extend from the second end of the optical coupler towards the first end of the optical coupler, such that the first waveguide element () partly overlaps with the second waveguide element () to adapt light passing between the first end () of the first waveguide element () and first end () of the second waveguide element ().

Apparatus and method for coupling light

An optical beam spot size convertor is provided having a body. The body comprises a first optical waveguide having a first refractive index and a plurality of second optical waveguides each having a second refractive index higher than the first refractive index. The first optical waveguide is arranged to receive an input optical beam. The first optical waveguide is further arranged such that light from the input optical beam is coupled from the first optical waveguide into the plurality of second optical waveguides. The body further comprises an output optical waveguide and a reflective part coupled to the plurality of second optical waveguides and to the output optical waveguide. The reflective part is arranged to focus optical beams received from the plurality of second optical waveguides into a single optical beam which is directed to the output optical waveguide.

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Pisa, Italy

Tommaso Cassese