Patent ID: 9733499
Date: 2017-08-15
CPC Classifications: G02B,G02F

Claim:
1. A slow light waveguide designed to slow the propagation of an optical signal that it said waveguide is guiding, said waveguide comprising: a substrate which extends essentially in a plane referred to as “substrate plane”, an optical axis tangent at any point to the direction of propagation of the optical signal inside of the slow light waveguide, said optical axis extending in a plane parallel to the substrate plane, a slowing section designed to slow the propagation of the optical signal, said section comprising lateral teeth disposed symmetrically on either side of the optical axis with a regular pitch p along the optical axis from the start of said slowing section up to its end, each lateral tooth extending continuously in a direction of extension parallel to the substrate plane, from a proximal end up to a distal end which constitutes the part of the lateral tooth furthest from the optical axis and each lateral tooth comprising a point of intersection between its direction of extension and the optical axis, the length of each lateral tooth being equal to the shortest distance between the optical axis and its distal end, a central waveguide which extends along the optical axis and which comprises, on either side of the optical axis, lateral sidewalls, the width of the central waveguide, inside of the slowing section, only being defined between two immediately consecutive lateral teeth and taken equal to the shortest distance, measured in a transverse direction parallel to the substrate plane and perpendicular to the optical axis, between the lateral sidewalls of the central waveguide situated on either side of the optical axis and between these consecutive lateral teeth, a broadening region extending along the optical axis, over a distance greater than d a narrowing region which extends along the optical axis over a distance greater than d wherein the slow light waveguide also comprises: an initial region which extends, along the optical axis, over a distance greater than d a final region which extends, along the optical axis, over a distance greater than d