Patent ID: 8472493

Claim:
A method for introducing light into a waveguide ( 3 ) formed on the upper surface of a microelectronics substrate, by means of a distributed feedback laser device formed by the association of an SOI-type structure having a portion forming said waveguide ( 3 ), of a stack of III-V semiconductor gain materials ( 5 ) partially covering the waveguide ( 3 ), and of an optical grating ( 9 ), wherein the grating step is selected so that the optical power of the laser beam circulates in a loop from the III-V stack ( 5 ) to the waveguide ( 3 ), and wherein the grating step is selected so that: β SOI (ω 2 )+β III-V (ω 2 )=2 nπ/a , and β SOI (ω 2 )≠β III-V (ω 2 ) with: a: grating step, ω 2 : mode frequency, β SOI : propagation constant in the waveguide, β III-V : propagation constant in said stack, n: an integer.