Integrated optics filtering component comprising an optical cladding and method for making same

A method of manufacturing an integrated optics component comprising:

• providing a substrate;
• and
• modifying a refractive index of said substrate to create a filtering unit that comprises an optical guide core, an optical cladding independent of the core, and at least two elementary zones of interaction arranged in series, each of said at least two elementary zones of interaction including a structural parameter that is different from a structural parameter of an adjacent elementary zone of interaction, each of said at least two elementary zones of interaction including an elementary grating configured to couple modes between the guide core and the optical cladding,
• wherein said refractive index is modified such that at least in part of the optical cladding next to the optical guide core and at least in the zone of interaction, a refractive index of the optical cladding is different from the refractive index of the substrate and lower than a refractive index of the core, and
• wherein a grating including elementary gratings of the filtering unit is created by a modification of the effective index of the substrate.