Optical coupling device
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsKarim Hassan, Salim Boutami
Life of this patent
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Abstract
An optical coupling device including, in sequence, a focusing lens and an optical coupling network, the coupling device being symmetric with respect to a plane, the focusing lens formed in a core layer, as a front face, perpendicular to the plane, the optical coupling network including a plurality of trenches, formed on the front face, and convex in shape, the optical coupling network including, in sequence, a first sub-network and a contiguous second sub-network, respectively delimited, by a first contour and a second contour, the first and second contours extending in a divergent manner and convergent manner respectively.
Claims10
An optical coupling device for coupling a waveguide with an optical fiber, the optical coupling device comprising in sequence, along a direction XX′:
- a focusing lens and an optical grating coupler, the optical coupling device being symmetrical with respect to a plane H;
- and wherein:
- the focusing lens is formed in a core layer having a refractive index nc and a thickness Ec, and comprising two faces, respectively as a front face and a rear face, which are essentially parallel, and in contact with media with refractive indices lower than the refractive index nc, the plane H is perpendicular to the core layer, and its intersection with the core layer comprises the direction XX′, the focusing lens is for focusing a light radiation, propagating along the direction XX′, at a focusing point F;
- the optical grating coupler comprises a plurality of trenches, formed on the front face, parallel to each other, and with a convex shape along the direction XX′,
- the optical grating coupler comprises, in sequence, along the direction XX′, a first sub-grating and a second sub-grating, which are contiguous, delimited, respectively, by a first contour and a second contour, the first and second contours extend, along the direction XX′, respectively, in a divergent way and in a convergent way, the focusing point F is included in the optical grating coupler.
Dependencies are inferred from the claim text.