Patent ID: 9239430
Filing Date: 2016-01-19
CPC Classification: G02B

Claim Text:
1. An integrated optical circuit comprising: an optically transparent substrate comprising: wherein said at least one waveguide has a non-rectilinear optical path between said at least one first waveguide end and said at least one second waveguide end, a straight line segment is defined between said at least one first waveguide end and said at least one second waveguide end, said at least one attenuation zone extending inside the substrate from the lower face to the upper face of the substrate, said at least one attenuation zone being positioned on said straight line segment so as to attenuate a non-guided optical beam transmitted via the substrate between said first waveguide end and said second waveguide end, said at least one waveguide and said at least one attenuation zone have respective dimensions such that said at least one attenuation zone does not cut said waveguide, and said at least one attenuation zone has such dimensions that a straight line passing through said first waveguide end and tangent to said at least one attenuation zone has a point of intersection with the output face located at a minimum distance x from said second waveguide end, such that the distance x is higher than or equal to: where D is the distance between said attenuation zone and said point of intersection, and λ is the wavelength in the material of said non-guided optical beam.