Thermally induced bend loss of silica optical fiber

Anthony Birri; Kelly McCary; Brandon A. Wilson; Thomas E. Blue

doi:10.1109/JSEN.2018.2846522

Thermally induced bend loss of silica optical fiber

Anthony Birri, Kelly McCary, Brandon A. Wilson, Thomas E. Blue

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Multimode and single-mode silica fibers have been tested in a high-temperature setting, while simultaneously experiencing a bend. The range of temperature tested was 500 °C-1000 °C and the bend radii considered were 1.27, 2.54, and 3.81 cm (0.5, 1.0, and 1.5 in). Multimode fiber (MMF) was analyzed for transmission, while single-mode fiber (SMF) was both analyzed for transmission and interpreted by optical backscatter reflectometry. Attenuation was observed to increase in MMF with increasingly high temperatures and tighter bend radii. SMF was far more resilient to transmission loss than MMF, under similar conditions of temperature and curvature. Optical backscatter reflectometry was performed for bent SMF up to 1100 °C and revealed evidence that, at high temperatures, bends in fiber can enhance devitrification that can inhibit light transmission through the fiber. This paper suggests that the devitrification process begins at the surface of the fiber and moves inward. Moreover, this paper suggests that bend stress applied to surface flaws of the fiber leads to significantly higher crystallization rates at temperatures at which silica does not typically devitrify so rapidly.

Original language	English
Pages (from-to)	6181-6187
Number of pages	7
Journal	IEEE Sensors Journal
Volume	18
Issue number	15
DOIs	https://doi.org/10.1109/JSEN.2018.2846522
State	Published - Aug 1 2018
Externally published	Yes

Funding

Manuscript received March 2, 2018; revised May 21, 2018 and May 23, 2018; accepted May 23, 2018. Date of publication June 11, 2018; date of current version July 11, 2018. This work was supported by the Department of Energy Nuclear University Programs through an Integrated Research Project, Advanced Instrumentation for Transient Reactor Testing, under Grant GRT00035185. The work of A. Birri was supported by the Department of Energy Integrated University Program Fellowship. The associate editor coordinating the review of this paper and approving it for publication was Dr. Daniele Tosi. (Corresponding author: Anthony Birri.) The authors are with the Nuclear Engineering Program within the Mechanical and Aerospace Department of Engineering, The Ohio State University, Columbus, OH 43210 USA (e-mail: [email protected]; [email protected]; [email protected]; [email protected]). Digital Object Identifier 10.1109/JSEN.2018.2846522 Anthony Birri is currently pursuing the Ph.D. degree in nuclear engineering with The Ohio State University. He is a student in the Nuclear Engineering Program within the Mechanical and Aerospace Engineering Department. His research and education are supported by the Nuclear Energy University Program Graduate Fellowship Program. His research pertains to the development of radiation-hard and thermally resilient optically based sensors for nuclear applications. This research includes both silica and sapphire optical fiber, both with and without added intrinsic sensors, such as FBGs.

Funders	Funder number
Department of Energy Integrated University
Department of Energy Nuclear University Programs	GRT00035185
Nuclear Energy University Program

Keywords

Bend loss
devitrification
optical fiber
silica

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10.1109/JSEN.2018.2846522

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title = "Thermally induced bend loss of silica optical fiber",

abstract = "Multimode and single-mode silica fibers have been tested in a high-temperature setting, while simultaneously experiencing a bend. The range of temperature tested was 500 °C-1000 °C and the bend radii considered were 1.27, 2.54, and 3.81 cm (0.5, 1.0, and 1.5 in). Multimode fiber (MMF) was analyzed for transmission, while single-mode fiber (SMF) was both analyzed for transmission and interpreted by optical backscatter reflectometry. Attenuation was observed to increase in MMF with increasingly high temperatures and tighter bend radii. SMF was far more resilient to transmission loss than MMF, under similar conditions of temperature and curvature. Optical backscatter reflectometry was performed for bent SMF up to 1100 °C and revealed evidence that, at high temperatures, bends in fiber can enhance devitrification that can inhibit light transmission through the fiber. This paper suggests that the devitrification process begins at the surface of the fiber and moves inward. Moreover, this paper suggests that bend stress applied to surface flaws of the fiber leads to significantly higher crystallization rates at temperatures at which silica does not typically devitrify so rapidly.",

keywords = "Bend loss, devitrification, optical fiber, silica",

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N2 - Multimode and single-mode silica fibers have been tested in a high-temperature setting, while simultaneously experiencing a bend. The range of temperature tested was 500 °C-1000 °C and the bend radii considered were 1.27, 2.54, and 3.81 cm (0.5, 1.0, and 1.5 in). Multimode fiber (MMF) was analyzed for transmission, while single-mode fiber (SMF) was both analyzed for transmission and interpreted by optical backscatter reflectometry. Attenuation was observed to increase in MMF with increasingly high temperatures and tighter bend radii. SMF was far more resilient to transmission loss than MMF, under similar conditions of temperature and curvature. Optical backscatter reflectometry was performed for bent SMF up to 1100 °C and revealed evidence that, at high temperatures, bends in fiber can enhance devitrification that can inhibit light transmission through the fiber. This paper suggests that the devitrification process begins at the surface of the fiber and moves inward. Moreover, this paper suggests that bend stress applied to surface flaws of the fiber leads to significantly higher crystallization rates at temperatures at which silica does not typically devitrify so rapidly.

AB - Multimode and single-mode silica fibers have been tested in a high-temperature setting, while simultaneously experiencing a bend. The range of temperature tested was 500 °C-1000 °C and the bend radii considered were 1.27, 2.54, and 3.81 cm (0.5, 1.0, and 1.5 in). Multimode fiber (MMF) was analyzed for transmission, while single-mode fiber (SMF) was both analyzed for transmission and interpreted by optical backscatter reflectometry. Attenuation was observed to increase in MMF with increasingly high temperatures and tighter bend radii. SMF was far more resilient to transmission loss than MMF, under similar conditions of temperature and curvature. Optical backscatter reflectometry was performed for bent SMF up to 1100 °C and revealed evidence that, at high temperatures, bends in fiber can enhance devitrification that can inhibit light transmission through the fiber. This paper suggests that the devitrification process begins at the surface of the fiber and moves inward. Moreover, this paper suggests that bend stress applied to surface flaws of the fiber leads to significantly higher crystallization rates at temperatures at which silica does not typically devitrify so rapidly.

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Thermally induced bend loss of silica optical fiber

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