Adiabatic tapered composite waveguide for athermalization
AssigneeCyoptics Ltd.
InventorSergey Frolov
Life of this patent
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Abstract
A planar waveguide circuit includes a silica-based planar optical waveguide circuit having a lower cladding, a core and an upper cladding. At least one input waveguide and one output waveguide are each coupled to the optical waveguide circuit. At least one tapered waveguide section is located in the waveguide circuit, which has an upper cladding segment that tapers down to at least the core to define a tapered recess. A filler material having a negative thermo-optic coefficient fills the tapered recess so that the optical waveguide circuit has an optical characteristic with a reduced temperature dependence.
Claims20
A planar waveguide circuit comprising:
- a silica-based planar optical waveguide circuit having a lower cladding, a core and an upper cladding;
- at least one input waveguide and one output waveguide each coupled to the optical waveguide circuit;
- at least one adiabatic tapered waveguide section located in the waveguide circuit and having an upper cladding segment that tapers down to at least the core to define a tapered recess;
- and
- a filler material having a negative thermo-optic coefficient filling the tapered recess whereby said optical waveguide circuit has an optical characteristic with a reduced temperature dependence.
A method comprising the steps of:
- providing a silica-based planar optical waveguide circuit having a lower cladding, a core and an upper cladding;
- providing at least one input waveguide and one output waveguide each coupled to the waveguide circuit;
- providing at least one adiabatic tapered waveguide section located in the waveguide circuit and having an upper cladding that tapers down to a least the core to define a tapered recess;
- and
- filling the tapered recess with a filler material having a negative thermo-optic coefficient so that said waveguide circuit has a transmission spectrum with a reduced temperature dependence.
Dependencies are inferred from the claim text.