Mr. Steven R. Laxton Profile

Steven R. Laxton

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Proceedings Article | 26 August 2015 Paper

Demonstration of a stand-alone cylindrical fiber coil for optical amplifiers

Steven Laxton, Tyler Bravo, Christi Madsen

Proceedings Volume 9586, 958619 (2015) https://doi.org/10.1117/12.2188368

KEYWORDS: Optical fabrication, Multimode fibers, Ray tracing, Spindles, Optical amplifiers, Structured optical fibers, Fiber optics, Waveguides, Optical testing, Epoxies

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The design, fabrication and measurement of a cylindrical fiber coil structure is presented that has applications for compact fiber-optic amplifiers. A multimode fiber is used as a surrogate for a dual clad, rare-earth doped fiber for coil fabrication and optical testing. A ray trace algorithm, written in Python, was used to simulate the behavior of light travelling along the waveguide path. An in-house fabrication method was developed using 3D printed parts designed in SolidWorks and assembled with Arduino-controlled stepper motors for coil winding. Ultraviolet-cured epoxy was used to bind the coils into a rigid cylinder. Bend losses are introduced by the coil, and a measurement of the losses for two coil lengths was obtained experimentally. The measurements confirm that bend losses through a multimode fiber, representative of pump light propagating in a dual-clad rare-earth doped fiber, are relatively wavelength independent over a large spectral range and that higher order modes are extinguished quickly while lower order modes transmit through the windings with relatively low loss.

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