On-line Writing of Fiber Bragg Grating Array on a Two-mode Optical Fiber for Sensing Applications

Abstract

On-line fabricated fiber Bragg grating (FBG) array and its sensing potentials have attracted plenty of attention in recent years. In this paper, FBG arrays are written on-line on a two-mode fiber, and this two-mode fiber Bragg grating (TM-FBG) is further experimentally investigated for temperature and curvature sensing. The responses of this sensor were characterized by 11.2 pm/°C and −0.21 dB/m−1 for temperature and curvature, respectively. Based on the measurements, a dual-parameter fiber sensing system was developed, which can realize the quasi-distributed, simultaneous detection of temperature and curvature, making it suitable for structural health monitoring or perimeter security.

Ultrafast laser writing of arbitrary long low-loss waveguides in optical fibers

“…In the near future, we aim at optimizing the writing setup and glass composition to further improve the waveguide properties in the telecom and mid-IR range. Our results pave the way toward the realization of more complex photonic cores arrangements in exotic optical fibers (in which core/cladding structures are hard to fabricate) with a potential implementation directly in a fiber draw tower [32,33]. Another promising perspective is related to the inherent weak continuous distribution of FBGs that could be useful for the implementation of random fiber lasers or distributed sensors [29,[41][42][43].…”

“…We characterize the modal properties and propagation losses of the waveguides and point out the mechanical limits of our system. Our work paves the way to the direct fabrication of complex arrangements of cores in standard and exotic optical fibers, ultimately integrated in a fiber draw tower [32,33]. Figure 1(a) shows a sketch of the proposed R2R-DLW technique.…”

Optimizing Evanescent Efficiency of Chalcogenide Tapered Fiber

“…To date, various types of fiber sensors based on evanescent wave have been proposed, among which chalcogenide fiber possess unique advantages for its wide transmission window which covers the mid-infrared molecular fingerprint. In recent years, researchers from University of Rennes 1 [ 1 , 2 , 3 ], Ningbo University [ 4 , 5 , 6 , 7 , 8 , 9 ], Zhejiang University [ 10 , 11 ], and other institutions [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ] have carried out extensive research on the mid-infrared evanescent wave absorption sensing technology, which proves that this technique can realize the real-time in situ qualitative and quantitative analysis of a variety of organic compounds. Dai et al developed a gas sensor based on a four-hole suspended core As 2 S 3 optical fiber, the sensitivity of which is less than 100 ppm for methane, and response time is estimated to be less than 20 s [ 8 ].…”