Journal
OPTICAL FIBER TECHNOLOGY
Volume 78, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.yofte.2023.103319
Keywords
Curvature; Strain; TM-FBG
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Although single-mode fibers are commonly used for optical fiber sensing, few-mode fibers have also been investigated as potential alternatives for multiple-parameter measurements. This study fabricated a two-mode fiber Bragg grating (TM-FBG) structure for enhanced sensitivity to curvature and strain variations.
Even though single-mode fibers are commonly used for optical fiber sensing, few-mode fibers, as potential alternatives, have also been investigated for multiple-parameter measurements, mainly because such fibers support only a few transverse modes with their own propagation constants. These modes respond in varied situations to different parameters and, therefore, can be retrieved and recognized. In this study, a two-mode fiber Bragg grating (TM-FBG) structure was fabricated, with its cladding layer surrounding the grating area partially etched away for enhanced sensitivity for curvature and strain variations. The experimental results show that within a curvature range of 0-19 m(-1), the difference in reflection peaks between the linear polarized LP01 and LP11 modes decreases at a rate of 0.46 dB/m(-1). The TM-FBG sensor is insensitive to fluctuations induced by the source and also independent of the grating's central wavelength. Within the specific range of 0-100 mN for strain measurement, the reflections of the two modes have similar responses of 27 nm/N.
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