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Optical Engineering

Modal reduction in single crystal sapphire optical fiber
Author(s): Yujie Cheng; Cary Hill; Bo Liu; Zhihao Yu; Haifeng Xuan; Daniel Homa; Anbo Wang; Gary Pickrell
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Paper Abstract

A type of single crystal sapphire optical fiber (SCSF) design is proposed to reduce the number of guided modes via a highly dispersive cladding with a periodic array of high- and low-index regions in the azimuthal direction. The structure retains a “core” region of pure single crystal (SC) sapphire in the center of the fiber and a “cladding” region of alternating layers of air and SC sapphire in the azimuthal direction that is uniform in the radial direction. The modal characteristics and confinement losses of the fundamental mode were analyzed via the finite element method by varying the effective core diameter and the dimensions of the “windmill”-shaped cladding. The simulation results showed that the number of guided modes was significantly reduced in the windmill fiber design, as the radial dimension of the air and SC sapphire cladding regions increase with corresponding decrease in the azimuthal dimension. It is anticipated that the windmill SCSF will readily improve the performance of current fiber optic sensors in the harsh environment and potentially enable those that were limited by the extremely large modal volume of unclad SCSF.

Paper Details

Date Published: 12 October 2015
PDF: 6 pages
Opt. Eng. 54(10) 107103 doi: 10.1117/1.OE.54.10.107103
Published in: Optical Engineering Volume 54, Issue 10
Show Author Affiliations
Yujie Cheng, Virginia Polytechnic Institute and State Univ. (United States)
Cary Hill, Virginia Polytechnic Institute and State Univ. (United States)
Bo Liu, Virginia Polytechnic Institute and State Univ. (United States)
Zhihao Yu, Virginia Tech Ctr. for Photonics Technology (United States)
Haifeng Xuan, Virginia Polytechnic Institute and State Univ. (United States)
Daniel Homa, Virginia Tech Ctr. for Photonics Technology (United States)
Anbo Wang, Virginia Polytechnic Institute and State Univ. (United States)
Gary Pickrell, Virginia Polytechnic Institute and State Univ. (United States)


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