Patent ID: 8953913
Filing Date: 2015-02-10
Classification: G02B

Abstract:
1. An integrated optical circuit comprising: a substrate, said substrate including an input face, an output face, a lower face, an upper face and two side faces, said lower face, upper face and side faces extending between the input face and the output face, the upper face being planar and opposite to the lower face; at least one optical waveguide located in a plane parallel to the upper face, said at least one optical waveguide extending between said input face and said output face; at least one first waveguide end located on the input face of the substrate and at least one second waveguide end located on the output face of the substrate; said integrated optical circuit being capable of receiving an incident optical beam on said first waveguide end, of forming a guided optical beam propagating in an optically guided manner, and of forming a non-guided optical beam propagating in a non-guided manner in the substrate, wherein, there being defined a median plane perpendicular to the upper face and to a line segment joining the first and the second waveguide ends, said median plane passing through the middle of said line segment, and an incidence plane perpendicular to the median plane, said incidence plane passing through the first end and the second end, said integrated optical circuit does not include a central groove but instead includes at least one groove off-centered with respect to the median plane, said at least one off-center groove extending from the lower face to an inside of the substrate, said at least one off-center groove being located at a non-zero distance d from said median plane, said at least one off-center groove having a height h in the incidence plane, said height h being higher than a minimum height h where L represents the length of the substrate, e the thickness of the substrate, d the distance between said off-center groove and the median plane, λ the wavelength in the material of a non-guided optical beam in the substrate, and D is equal to (L/2−d), said at least one off-center groove being capable of attenuating said non-guided optical beam transmitted by said substrate between said first end and said second end.