Modal reduction in single crystal sapphire optical fiber

Cheng, Yujie; Hill, Cary; Liu, Bo; Yu, Zhihao; Xuan, Haifeng; Homa, Daniel; Wang, Anbo; Pickrell, Gary

doi:10.1117/1.OE.54.10.107103

Title: Modal reduction in single crystal sapphire optical fiber

Journal Article · Mon Oct 12 00:00:00 EDT 2015 · Optical Engineering

DOI:https://doi.org/10.1117/1.OE.54.10.107103· OSTI ID:1258651

Cheng, Yujie ^[1]; Hill, Cary ^[1]; Liu, Bo ^[1]; Yu, Zhihao ^[1]; Xuan, Haifeng ^[1]; Homa, Daniel ^[1]; Wang, Anbo ^[1]; Pickrell, Gary ^[1]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

A new 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 were 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.

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Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0012274

OSTI ID:: 1258651

Journal Information:: Optical Engineering, Vol. 54, Issue 10; ISSN 0091-3286

Publisher:: SPIECopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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