Dr. Johannes Heidenhain Gmbh

Martin Roetzer

Wolfgang Holzapfel

Michael Kugler

Marco Schade

A device includes a grating coupler with a grating constant, two light sources, and a planar waveguide, which are configured to couple light with two different wavelengths &#x3bb;, &#x3bb;into the waveguide. The waveguide has a waveguiding layer disposed adjacent to a substrate layer and a cover layer. The waveguiding layer has a thickness d and effective refractive indices of N(&#x3bb;, j), wherein &#x3bb;is one of the wavelengths and jis an order of a waveguide mode, wherein the coupled light of the wavelength &#x3bb;has a coupling angle &#x3b1;into the waveguide, and wherein an amount of difference between the coupling angles is a divergence angle &#x394;&#x3b1;. Guiding of waveguide modes of the order j&#x3e;0 is possible for a wavelength of the coupled light. The waveguiding layer is arranged to couple the light via the grating coupler under a divergence angle of &#x394;&#x3b1;&#x3c;6.

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Traunreut, Germany

Martin Roetzer