Multispectral filter
AssigneeViavi Solutions Inc.
InventorGeorg J. Ockenfuss
Life of this patent
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Abstract
An optical filter may include a substrate, a first mirror that includes a first subset of layers of a set of layers, and a second mirror that includes a second subset of layers of the set of layers. The optical filter may include a spacer. The spacer may include a third subset of layers of the set of layers. The set of layers may include a plurality of high refractive index layers associated with a first refractive index and a plurality of low refractive index layers associated with a second refractive index that is less than the first refractive index. The optical filter may be associated with a spectral range from at least approximately 1200 nanometers (nm) to approximately 1900 nm.
Claims18
An optical filter with a set of layers, the optical filter comprising:
- a substrate;
- a first mirror,
- wherein the first mirror includes a first subset of layers of the set of layers;
- a second mirror,
- wherein the second mirror includes a second subset of layers of the set of layers;
- and
- a spacer,
- wherein the spacer includes a third subset of layers of the set of layers,
- wherein the set of layers includes a plurality of high refractive index layers associated with a first refractive index and a plurality of low refractive index layers associated with a second refractive index that is less than the first refractive index,
- wherein the plurality of high refractive index layers include one or more hydrogenated layers, and
- wherein the optical filter enables transmissivity in a spectral range from at least approximately 1200 nanometers (nm) to approximately 1900 nm.
A binary multispectral filter, comprising:
- a plurality of layers,
- wherein the plurality of layers includes a set of high refractive index layers associated with a first refractive index and a set of low refractive index layers associated with a second refractive index that is less than the first refractive index,
- wherein the plurality of layers form a plurality of channels to direct a plurality of wavelengths of light,
- wherein the set of high refractive index layers include at least one of:
- a hydrogenated silicon germanium layer, or
- a hydrogenated germanium layer, and
- wherein the binary multispectral filter enables transmissivity in a spectral range of from approximately 1100 nanometers (nm) to approximately 2000 nm.
A system, comprising:
- a set of optical sensors disposed in a substrate;
- and
- a nnultispectra filter deposited on the substrate,
- the nnultispectral filter including:
- a first set of layers and a second set of layers sandwiching one or more spacer layers, wherein the first set of layers and the second set of layers include alternating high refractive index layers with a first refractive index and low refractive index layers with a second refractive index less than the first refractive index,
- wherein a material, a thickness, and a quantity of the high refractive index layers and the low refractive index layers are selected to form a set of channels corresponding to the set of optical sensors and to cause a threshold spectral width for the set of channels,
- wherein the high refractive index layers include one or more hydrogenated layers, and
- wherein the one or more hydrogenated layers include at least one of:
- a hydrogenated germanium layer, or
- a hydrogenated silicon germanium layer, and
- wherein the multispectral filter enables transmissivity in a spectral range from at least approximately 1200 nanometers (n m) to approximately 1900 nm.
Dependencies are inferred from the claim text.