Materials, Photonic Devices, and Sensors

Modal reduction in single crystal sapphire optical fiber

[+] Author Affiliations
Yujie Cheng, Cary Hill, Daniel Homa

Virginia Polytechnic Institute and State University, Department of Materials Science and Engineering, 213 Holden Hall, Blacksburg 24060, United States

Bo Liu, Zhihao Yu, Haifeng Xuan, Anbo Wang

Virginia Polytechnic Institute and State University, Center for Photonics Technology, Bradley Department of Electrical and Computer Engineering, 460 Turner Street, Suite 303, Blacksburg, Virginia 24061-0287, United States

Gary Pickrell

Virginia Polytechnic Institute and State University, Department of Materials Science and Engineering, 213 Holden Hall, Blacksburg 24060, United States

Virginia Polytechnic Institute and State University, Center for Photonics Technology, Bradley Department of Electrical and Computer Engineering, 460 Turner Street, Suite 303, Blacksburg, Virginia 24061-0287, United States

Opt. Eng. 54(10), 107103 (Oct 12, 2015). doi:10.1117/1.OE.54.10.107103
History: Received June 15, 2015; Accepted September 10, 2015
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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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Yujie Cheng ; Cary Hill ; Bo Liu ; Zhihao Yu ; Haifeng Xuan, et al.
"Modal reduction in single crystal sapphire optical fiber", Opt. Eng. 54(10), 107103 (Oct 12, 2015). ; http://dx.doi.org/10.1117/1.OE.54.10.107103


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