Fiber Bragg gratings (FBGs) in the center of multimode microfibers (MM-MF) with 10μm diameter were successfully inscribed with point-by-point method and their reflection spectra show peaks over 10dB signal-to-noise ratio (SNR) and less than 0.5nm bandwidth. FBGs on regular size multimode fiber (~60μm core size) shows nearly continuous reflection spectrum. However, when the diameter of the multimode fiber is reduced to ~10μm, its modal volume significantly decreases so that the remaining optical modes are separated by larger propagation constant difference, resulting distinguishable sharp peaks on FBG reflection spectrum. Therefore, MM-MF based FBGs could be practical sensors for simultaneous multi-parameters with outstanding sensitivity and accuracy.
Di Hu, Haifeng Xuan, Shuo Yang, Jiaji He, and Anbo Wang, "FBG inscription in multimode microfiber via point-by-point radiation with femtosecond laser," Proc. SPIE 10091, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXII, 100910K (Presented at SPIE LASE: January 31, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2253198.
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