US 12,032,201 B2
Optical waveguide
César Jáuregui Misas, Jena (DE); Jens Limpert, Jena (DE); and Andreas Tünnermann, Weimar (DE)
Assigned to Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE); and Friedrich-Schiller-Universität Jena, Jena (DE)
Appl. No. 17/616,720
Filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE); and Friedrich-Schiller-Universität Jena, Jena (DE)
PCT Filed Jun. 4, 2020, PCT No. PCT/EP2020/065422
§ 371(c)(1), (2) Date Dec. 6, 2021,
PCT Pub. No. WO2020/245244, PCT Pub. Date Dec. 10, 2020.
Claims priority of application No. 10 2019 114 974.6 (DE), filed on Jun. 4, 2019.
Prior Publication US 2022/0326431 A1, Oct. 13, 2022
Int. Cl. G02B 6/02 (2006.01)
CPC G02B 6/02042 (2013.01) [G02B 6/021 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An optical waveguide with:
two or more light-guiding cores extending continuously along the longitudinal extension of the optical waveguide, parallel to one another and spaced apart from one another, from one end of the optical waveguide to the other, and
with a first cladding enclosing the cores,
wherein the cores are arranged relative to one another and are spaced apart from one another in such a way that the propagation modes of the light propagating in the optical waveguide at a working wavelength couple to one another, the length of the optical waveguide being selected such that the light coupled into a single one of the cores at one end of the optical waveguide first spreads to the other cores during propagation through the optical waveguide and, after passing through the optical waveguide, leaves the optical waveguide again at the other end from a single core with at least 60% of the total light power propagating in the optical waveguide;
wherein at least one of the cores is at least one doped core doped with rare earth ions;
wherein at least one of the other cores is at least one not doped core not doped with rare earth ions;
wherein an intensity of the light power propagating in the optical waveguide oscillates in the at least one doped core and in the at least one not doped core over a propagation distance while the light transfers back and forth between the cores,
wherein a length of the optical waveguide is set such that at least a majority of the light power propagating in the optical waveguide leaves the optical waveguide via the at least one not doped core.