An optical mode converter, in particular for the coupling of a light waveguide and a high index contrast - waveguide

摘要

A half conductor based optical mode converter (100, 100 '', 100 ") for coupling an optical mode of a light waveguide (3f) with an optical mode of a waveguide (3a), wherein the optical mode converter comprises:– a first waveguide (1a), which moves along a first main extends along the direction (z) and an end facet (30) adapted to the optical waveguide (3f) to be coupled, wherein the first waveguide (1a) a first core (1) and a first shell (6, 4) and a first contrast in refractive index (δn₁) contains;– a second waveguide (2a) of a second core (2) and a second shell (6, 4) and a second contrast in refractive index (δn₂) , wherein one end (9) of the second waveguide and the end (31) of the first waveguide (1a) is coupled joint;– a third waveguide (3a) which, in relation to the second waveguide is arranged, in order to achieve an evanescent optical coupling with the second waveguide to can be realized, with the second waveguide (2a), wherein the third waveguide (3a) a third core (3) and a third shell (4, 7) and a third contrast in refractive index (δn₃) having,wherein the third core (3) a tapered region (13, 13 '') in at least one part, in which the evanescent coupling takes place, and wherein the contrast in refractive index (δn₁) of the first waveguide (1a) is lower than the contrast in refractive index (δn₂) of the second waveguide (2a), the contrast in refractive index (δn₂) of the second waveguide is lower than the contrast in refractive index (δn₃) of the third waveguide, and the contrast in refractive index (δn₃) of the third waveguide is not less than 18%.