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Silicon germanium based optical filter

An optical filter and optical transmitter technology, applied in the field of optical filters and optical systems, can solve problems such as interference with NIR light

Active Publication Date: 2021-07-02
VIAVI SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ambient light may interfere with the NIR light during emission to the user and / or during reflection from the user to the optical receiver

Method used

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  • Silicon germanium based optical filter
  • Silicon germanium based optical filter
  • Silicon germanium based optical filter

Examples

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Embodiment Construction

[0015] The following detailed description of example embodiments refers to the accompanying drawings. The same reference numbers in different drawings may identify the same or similar elements.

[0016] An optical receiver may receive light from a light source such as an optical transmitter. For example, an optical receiver may receive near-infrared (NIR) light from an optical transmitter and reflected from a target, such as a user or an object. In this case, the optical receiver may receive NIR light as well as ambient light such as visible spectrum light. Ambient light may include light from one or more light sources separate from the optical emitter, such as sunlight, light from a light bulb, or the like. Ambient light may reduce the accuracy of determinations related to NIR light. For example, in a gesture recognition system, ambient light may reduce the accuracy of the generation of a three-dimensional image of an NIR light-based target. Thus, the optical receiver may...

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Abstract

An optical filter may include a substrate. The optical filter may include a set of optical filter layers arranged on a substrate. The set of optical filter layers includes a first subset of optical filter layers. The first subset of optical filter layers may include silicon germanium (SiGe) having a first index of refraction. The optical filter may comprise a second subset of optical filter layers. The second subset of optical filter layers may comprise a material having a second index of refraction. The second refractive index is smaller than the first refractive index.

Description

technical field [0001] The present disclosure relates to optical filters and optical systems. Background technique [0002] Optical emitters can emit light directed at objects. For example, in a gesture recognition system, an optical transmitter may emit near-infrared (NIR) light toward a user, and the NIR light may reflect from the user toward an optical receiver. In this case, the optical receiver can capture information about the NIR light, and this information can be used to recognize the gesture the user is performing. For example, the device may use this information to generate a three-dimensional representation of the user, and based on the three-dimensional representation, recognize gestures that the user is performing. [0003] In another example, information about the NIR light can be used to identify the identity of the user, a characteristic of the user (such as height or weight), another type of characteristic of the target (such as the distance to the object,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/28
CPCG02B5/281G02B5/285C23C14/06C23C14/14C23C14/352C23C14/5806G02B5/207G02B5/20G02B1/113C23C14/0057C23C14/185C23C14/3407H01J37/3417H01J37/3426
Inventor G.J.奥肯福斯
Owner VIAVI SOLUTIONS INC