# US 11,906,779 B2 · Embedding LEDs with waveguides

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- Number: US 11,906,779 B2
- Document ID: US11906779B2
- Status: Granted
- Kind: B2
- Application number: 18/119,111
- Filed: 2023-03-08
- Published: 2023-09-21
- Granted: 2024-02-20
- Earliest claimed: 2020-05-18
- Assignees: AvicenaTech, Corp.
- Applicants: Avicenatech Corp.
- Inventors: Robert Kalman; Bardia Pezeshki; Alexander Tselikov; Cameron Danesh
- Web page: https://patentgrep.com/patent/US11906779B2

## CPC

- G02B 6/122: Basic optical elements, e.g. light-guiding paths
- G02B 6/4214: {the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device (G02B6/4246 takes precedence)}
- G02B 6/4298: {coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers}
- G02B 6/43: Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections
- H10H 20/853: characterised by their shape
- H10H 20/855: Optical field-shaping means, e.g. lenses
- H10H 20/856: Reflecting means
- G02B 2006/12102: {Lens}
- G02B 2006/12123: {Diode}
- H10H 20/819: characterised by their shape, e.g. curved or truncated substrates
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A microLED may be used to generate light for intra-chip or inter-chip communications. The microLED, or an active layer of the microLED, may be embedded in a waveguide. The waveguide may include a lens.

## Claims

### Claim 1

An optical coupling arrangement for an optical communication system, comprising:
a microLED on a substrate, the microLED having a top surface and a bottom surface with an active layer therebetween;
a waveguide on the substrate, the microLED being at least partially within the waveguide;
a reflector on at least a portion of the waveguide, the reflector positioned to reflect light from the microLED down an axis of the waveguide; and
a lens within the waveguide and in an optical path between the microLED and the reflector, the lens separated by one focal length from the active layer of the microLED.

### Claim 2 (depends on 1)

The optical coupling arrangement of claim 1, wherein the active layer of the microLED is within the waveguide.

### Claim 3 (depends on 1)

The optical coupling arrangement of claim 1, wherein the bottom surface of the reflector has a bottom reflector.

### Claim 4 (depends on 1)

The optical coupling arrangement of claim 1, wherein the lens is a convex lens.

### Claim 5 (depends on 4)

The optical coupling arrangement of claim 4, wherein the lens is of a material with a higher index of refraction than material of the waveguide.

### Claim 6 (depends on 1)

The optical coupling arrangement of claim 1, wherein the lens is a concave lens.

### Claim 7 (depends on 6)

The optical coupling arrangement of claim 6, wherein the lens is of a material with a lower index of refraction than material of the waveguide.

### Claim 8 (depends on 1)

The optical coupling arrangement of claim 1, wherein the reflector forms a 45-degree turning mirror.

### Claim 9 (depends on 1)

The optical coupling arrangement of claim 1, wherein the microLED includes a curved surface.

### Claim 10 (depends on 1)

The optical coupling arrangement of claim 1, wherein the active layer of the microLED is separated from side edges of the microLED.

### Claim 11 (depends on 10)

The optical coupling arrangement of claim 10, wherein the microLED includes a curved surface.

### Claim 12 (depends on 1)

The optical coupling arrangement of claim 1, further comprising an electrical connection from a top of the waveguide, through a via in the waveguide, to a conductive contact on the top surface of the microLED.

### Claim 13 (depends on 1)

The optical coupling arrangement of claim 1, wherein the top surface of the microLED is curved with a radius of curvature centered in a center of the active region of the microLED.

### Claim 14 (depends on 1)

The optical coupling arrangement of claim 1, wherein side edges of the microLED are angled to make the microLED pyramid-shaped.