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US 2026/0309915 A1Published application
Distributed bragg grating with ultralow index perturbation
AssigneeUniversity of Rochester
InventorsQiang Lin, Shixin Xue
Life of this patent
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Abstract
A waveguide grating with an ultralow index perturbation is described. A waveguide structure comprises a core and a cladding. The cladding is made of a material that has a lower refractive index than a material of the core. The waveguide grating is formed in the material of the cladding, and the waveguide grating does not extend into the waveguide core.
Claims20
A system for waveguide structure comprising:
- a waveguide core formed in a device layer of a semiconductor structure or a dielectric structure;
- a waveguide cladding, wherein the waveguide cladding is made of a material that has a lower refractive index than a material of the waveguide core;
- and
- a grating formed in the material of the waveguide cladding, wherein:
- the grating formed in the waveguide cladding does not extend into the waveguide core;
- the grating is a Bragg grating;
- the Bragg grating has a periodic refractive index modulation between a high refractive index and a low refractive index;
- the high refractive index is the material of the waveguide cladding;
- and
- the waveguide structure is part of a photonic integrated chip.
7 more elements
A system for waveguide structure comprising:
- a waveguide core;
- a waveguide cladding, wherein the waveguide cladding is made of a material that has a lower refractive index than a material of the waveguide core;
- and
- a grating formed in the material of the waveguide cladding, wherein the grating formed in the waveguide cladding does not extend into the waveguide core.
1 more element
A method for making for a waveguide structure comprising:
- forming a waveguide core;
- applying a waveguide cladding on the waveguide core, wherein the waveguide cladding is made of a material that has a lower refractive index than a material of the waveguide core;
- and
- forming a grating in the material of the waveguide cladding, after applying the waveguide cladding on the waveguide core, wherein the grating formed the waveguide cladding does not extend into the waveguide core.
1 more element
Dependencies are inferred from the claim text.