Journal
OPTICS LETTERS
Volume 47, Issue 18, Pages 4724-4727Publisher
Optica Publishing Group
DOI: 10.1364/OL.471370
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Funding
- Sandia National Laboratories
- U.S. Department of Energy's National Nuclear Security Administration [DE -NA -0003525]
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In this study, the point-by-point inscription of sapphire parallel fiber Bragg gratings (sapphire pFBGs) in a fully multi-mode system is investigated. The critical role of parallel FBGs in enabling detectable and reliable high-order grating signals is demonstrated. The impacts of modal volume, spatial coherence, and grating location on reflectivity are examined. Three cascaded seventh-order pFBGs are fabricated in one sapphire fiber for wavelength multiplexed temperature sensing, and reliable measurement up to 1500 degrees C is demonstrated using a low-cost, fully multimode 850-nm interrogator.
We study the point-by-point inscription of sapphire parallel fiber Bragg gratings (sapphire pFBGs) in a fully multi-mode system. A parallel FBG is shown to be critical in enabling detectable and reliable high-order grating sig-nals. The impacts of modal volume, spatial coherence, and grating location on reflectivity are examined. Three cas-caded seventh-order pFBGs are fabricated in one sapphire fiber for wavelength multiplexed temperature sensing. Using a low-cost, fully multimode 850-nm interrogator, reliable measurement up to 1500 degrees C is demonstrated. (c) 2022 Optica Publishing Group
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