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Abstract
This paper describes a novel fiber designed to produce uniform illumination in angular space along its length. The mechanism of light extraction from the silica glass guiding region is due to nano-sized gas filled voids formed during fiber preform consolidation and fiber draw process. The resulting effect creates an aesthetically pleasing line or string of light which provides a long, thin, and flexible illumination tool for a variety of designs or functional applications. The rate of light extraction is determined by size and number of the formed these elongated voids features. The scattering material in the secondary coating modifies the scattering distribution function to make it uniform in angular space. The rate of the scattering efficiency can be controlled by drawing conditions and light launch conditions from the light source. The spectral efficiency of scattering is very high due to use of pure silica and low-absorbance coating materials from UV through IR. The use of color conversion materials placed outside the secondary coating can be used to generate a wide range of colors using a blue wavelength light pump, including pure white colors with a color temperature ranging from 3000 to 10000 K. Finally, a range of aesthetic and functional illumination applications for this fiber are also discussed.
Highlights
T HE use of glass optical fiber as a means to transmit light across long distances with little loss of light power has revolutionized many facets of our world and played a major role in the rapid pace of technical advancement in telecommunication that we know today
As such, manufacturing a glass fiber fit for long distance/low loss light propagation requires a robust knowledge of the materials science of the light-carrying fiber core, the cladding material used to confine the light to the core and the polymeric coatings that protect and permit handling of the fiber
One may carry this knowledge a step further by realizing that this material science understanding may be extended to controlling the light exiting from not merely the other end of the fiber, and via a controlled release of the light through the clad layer and polymeric coatings
Summary
T HE use of glass optical fiber as a means to transmit light across long distances with little loss of light power has revolutionized many facets of our world and played a major role in the rapid pace of technical advancement in telecommunication that we know today. This paper describes the efforts that we have made to generate an orderly, consistent loss of light down optical fibers of various lengths through the sides of the fiber and the extension of this ability to wavelengths outside the visible region to the UV and IR ranges. Optical properties of such fibers are described in detail, and applications of such illumination fibers are discussed
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