A Brillouin Athermal Optical Fiber (2012-082)

Market Overview:

Optical fibers are enablers of a wide variety of modern technologies. However, during use, optical fibers heat up and their performance can subsequently change. This form of thermal dependence is especially problematic for high energy fiber laser and optical fiber sensor systems.  Currently, the market for optical fiber sensors is projected to be $4 billion by 2017 and experience a growth rate of 20.3%. The addition of alumina to the silica fibers can mitigate the thermal effects of the fibers. However, conventional methods severely limit the addition of alumina to silica. In order to solve this problem and take advantage of the optimal market environment, Clemson University researchers have developed a novel process that uses a molten-core technique to add sapphire (Al2O3) to silica (SiO2) glass. Ultimately, this is an industry accepted and scalable manufacturing technique that allows for unstable glasses to be directly obtained in fiber form, creating an optical fiber that has a temperature independent acoustic spectrum. These fibers will substantially enable higher performance optical fibers and open the door to more market opportunities. 


Application                                                                            Stage of Development

High energy fiber lasers; optical fiber sensors                       Validated Prototype



•    Record low Brillouin scattering, eliminating one drawback of current high-powered systems by offering

      athermal acoustic Brillouin spectrum characteristics

•    Low cost precursor materials, enabling scalability and competitive pricing for entry into new markets

•    Process utilizes a continuous high-speed manufacturing compatible with existing commercial techniques,

      allowing for easy adaption and implementation


Technical Summary

Clemson University researchers have developed a molten-core technique to add sapphire (Al2O3) to silica glass. The addition of alumina to silica fibers greatly enhances the fiber’s immunity to selected optical non-linearities. The core material is able to melt the temperature in which the cladding glass draws into the fiber.  The high quench rates permit previously unrealizable core compositions to be directly obtained in fiber form. This invention accomplishes the formation of an optical fiber whose acoustic (Brillouin) spectrum is temperature independent, a characteristic that has never been previously validated. 


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Inventor:                        Dr. John Ballato & Dr. Peter Dragic

Patent Type:                  Utility

Serial Number:              14/245,448

CURF Ref No:              2012-082

Patent Information:
Advanced Materials
For Information, Contact:
Chris Gesswein
Director of Licensing
Clemson University Research Foundation
John Ballato
Peter Dragic
Optical Fibers/Materials/Other
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