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DOE OSTI · 1887416

Point-by-point inscribed sapphire parallel fiber Bragg gratings in a fully multimode system for multiplexed high-temperature sensing

Shi, Guannan·Shurtz, Randy·Pickrell, Gary·Wang, Anbo·Zhu, Yizheng
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Abstract

In this work, we study the point-by-point inscription of sapphire parallel fiber Bragg gratings (sapphire pFBGs) in a fully multimode system. A parallel FBG is shown to be critical in enabling detectable and reliable high-order grating signals. 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. Using a low-cost, fully multimode 850-nm interrogator, reliable measurement up to 1500°C is demonstrated.

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Shi, Guannan, Shurtz, Randy, Pickrell, Gary, Wang, Anbo, Zhu, Yizheng. 2022-09-09. Point-by-point inscribed sapphire parallel fiber Bragg gratings in a fully multimode system for multiplexed high-temperature sensing. https://doi.org/10.1364/ol.471370

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