| 摘要 |
An integrated optical circuit includes a substrate having an input face, an output face, a lower face and an upper face, at least one optical waveguide having a first waveguide end located on the input face of the substrate and a second waveguide end located on the output face of the substrate. The lower face of the substrate includes a first part that is planar and parallel to the upper face and an optical block, the optical block being positioned in the median plane and in the incidence plane, the optical block forming a protrusion at least at the primary reflection point of the integrated optical circuit with respect to the first planar part of the lower face and the optical block being capable of receiving and attenuating at least one non-guided optical beam propagating on the optical path of a primary reflection. |
| 主权项 |
1. An integrated optical circuit comprising:
a 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, characterized in that, there being defined a median plane perpendicular to the upper face and to a line segment joining the first waveguide ends, said median plane passing through the middle of said line segment, an incidence plane perpendicular to the median plane, said incidence plane passing through the first end and the second end, and a primary reflection point located on the lower face at the intersection of the median plane and the incidence plane; the integrated optical circuit includes an optical block extending from the lower face to the outside of the substrate, arranged in the form of a part added on the lower face of the substrate, said optical block being positioned in the median plane and in the incidence plane and being in contact with said substrate at said primary reflection point and on a surface surrounding said primary reflection point, the lower face of the substrate comprising a first part that is planar and parallel to the upper face, said optical block forming a protrusion, at least at the primary reflection point, with respect to said first planar part of the lower face, and said optical block being capable of receiving and attenuating at least one non-guided optical beam propagating on the optical path of a primary reflection on said primary reflection point between said first waveguide end and said second waveguide end, wherein said optical block comprises at least one first facet arranged between the output face and said median plane, said at least one first facet being capable of receiving at least one non-guided optical beam propagating from the first end to said primary reflection point and/or at least one primary-reflection non-guided optical beam propagating from said primary reflection point to the second end, so as to attenuate said primary-reflection non-guided optical beam, and wherein, said substrate has a thickness eL between the planar part of the lower face and the upper face, said substrate has a length L between said input face and output face, and said at least one first facet is located at a distance D from said median plane that is higher than or equal to a minimum distance Dmin, where Dmin is defined by the following equation:Dmin=L2×λ/L8×e1. |
