Browse Prior Art Database

Coupling of different colored light in a multi-core fiber

IP.com Disclosure Number: IPCOM000214860D
Publication Date: 2012-Feb-07
Document File: 2 page(s) / 55K

Publishing Venue

The IP.com Prior Art Database

Abstract

Coupling of light from multiple light sources (i.e. RGB-LED) into multi-core fiber (Figure 1) has challenges. If light from the various sources is not properly mixed, the individual colors are transported by a single fiber. So as a result of this behavior, there is a “rainbow effect” as shown in Figure 2. At the end of the fiber the wavelength of side-scattered light will dependent on the angle of observation.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 82% of the total text.

Page 01 of 2

Coupling of different colored light in a multi-core fiber

Bernd Lücke, Martin Weigert, Michael Wappmannsberger Avago Technologies

Abstract:

This document describes a way to mix and couple light into a multi-core fiber for side light illumination. Light mixers make it possible to guarantee a uniform distribution of light in the multi-core fiber.

Concept:

Coupling of light from multiple light sources (i.e. RGB-LED) into multi-core fiber (Figure 1) has challenges. If light from the various sources is not properly mixed, the individual colors are transported by a single fiber. So as a result of this behavior, there is a "rainbow effect" as shown in Figure 2. At the end of the fiber the wavelength of side-scattered light will dependent on the angle of observation.

Single Fiber
Buffer (semi-transparent)

 

Figure 1: multi‐core fiber sectional view

Multicore-Fiber

Buffer

(semi-transparent)

Light sources 

Figure 2: coupling without mixer


Page 02 of 2

The idea is to couple the single light first into a light mixer and then into each single fibers of a multi-core-fiber. This light mixer has a smaller refractive index at the cladding as in the core, similar to existing glass- or plastic fiber technology.

Using this technology it is possible to couple the same amount and color of light into each single fiber of the multi-core fiber (figure 3). With the right core-material it is feasible to manipulate the light for a better mixing or color-management. It's also c...