# US 8,542,961 B2 · Optical beam couplers and splitters

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- Number: US 8,542,961 B2
- Document ID: US8542961B2
- Status: Granted
- Kind: B2
- Application number: 13/126,845
- Filed: 2008-10-31
- Published: 2011-08-25
- Granted: 2013-09-24
- Earliest claimed: 2008-10-31
- Assignees: Hewlett-Packard Development Company, L.P.
- Applicants: Huei Pei Kuo; Michael Renne Ty Tan; Shih-Yuan Wang; Robert G. Walmsley; Paul Kessler Rosenberg
- Inventors: Huei Pei Kuo; Michael Renne Ty Tan; Shih-Yuan Wang; Robert G. Walmsley; Paul Kessler Rosenberg
- Web page: https://patentgrep.com/patent/US8542961B2

## CPC

- G02B 6/2817: {using reflective elements to split or combine optical signals}
- G02B 27/126: {The splitting element being a prism or prismatic array, including systems based on total internal reflection}
- G02B 27/145: {having sequential partially reflecting surfaces}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Beam couplers and splitters are disclosed herein. An embodiment of a beam coupler and splitter includes a first waveguide including a bevel and a bend, and a second waveguide including a bevel complementarily shaped to the first waveguide bevel. The first waveguide bevel is configured to totally internally reflect at least some light incident thereon. The second waveguide is coupled to the first waveguide such that i) the second waveguide bevel is adjacent to at least a portion of the first waveguide bevel, and ii) a predetermined coupling ratio is achieved.

## Claims

### Claim 1

A beam coupler and splitter, comprising:
a first waveguide including a first waveguide bevel and a bend, the first waveguide bevel being configured to totally internally reflect at least some light incident thereon; and
a second waveguide including a second waveguide bevel complementarily shaped to the first waveguide bevel, the second waveguide being coupled to the first waveguide such that i) the second waveguide bevel is adjacent to at least a portion of the first waveguide bevel, and ii) a predetermined coupling ratio is achieved;
wherein the first waveguide bevel is a compound bevel including a first sub-bevel and a second sub-bevel, wherein the second waveguide bevel is a compound bevel including i) a first sub-bevel complementarily shaped to the second sub-bevel of the first waveguide compound bevel and ii) a second sub-bevel complementarily shaped to the first sub-bevel of the first waveguide compound bevel, wherein the first sub-bevels of the first and second waveguide compound bevels and the second sub-bevels of the first and second waveguide compound bevels are respectively coupled to form a gap between each of i) the first sub-bevels, and ii) the second sub-bevels.

### Claim 2 (depends on 1)

The beam coupler and splitter as defined in claim 1 wherein each of the gaps is greater than 1 wavelength.

### Claim 3 (depends on 1)

The beam coupler and splitter as defined in claim 1 wherein each of the first waveguide and the second waveguide are formed of a fiber selected from the group consisting of glass, polycarbonate, polyamide, acrylic, and silicon.

### Claim 4 (depends on 3)

The beam coupler and splitter as defined in claim 3 wherein a diameter of each of the fibers ranges from about 20 microns to about 1000 microns.

### Claim 5 (depends on 1)

The beam coupler and splitter as defined in claim 1 wherein a refractive index of the first waveguide and a refractive index of the second waveguide are the same.