Document Type

Article

Disciplines

2.2 ELECTRICAL, ELECTRONIC, INFORMATION ENGINEERING

Publication Details

https://pubmed.ncbi.nlm.nih.gov/36946962/

Tian K, Zhang M, Zhao C, Li H, Li S, Jiang Y, Lewis E, Farrell G, Wang P. High-sensitivity vector bend sensor based on a fiber directional coupler inscribed by a femtosecond laser. Opt Lett. 2023 Mar 15;48(6):1498-1501.

doi: 10.1364/OL.479114.

Abstract

In this Letter, we demonstrate a high-sensitivity vector bend sensor based on a fiber directional coupler. The fiber directional coupler is composed of two parallel waveguides inscribed within a no-core fiber (NCF) by a femtosecond laser. Since the two written waveguides have closely matched refractive indices and geometries, the transmission spectrum of the fiber directional coupler possesses periodic resonant dips. Such a fiber directional coupler exhibits a good bending-dependent spectral shift response due to its asymmetric structure. Experimental results show that bending sensitivities of -97.11 nm/m-1 and 58.22 nm/m-1 are achieved for the 0° and 180° orientations in the curvature range of 0-0.62 m-1, respectively. In addition, the proposed fiber directional coupler is shown to be insensitive to external humidity changes, thus improving its suitability in high-accuracy bending measurements.

DOI

https://doi.org/10.1364/OL.479114

Funder

National Natural Science Foundation of China (NSFC) (62225502, 61935006, 62090062, 62205085); Heilongjiang Provincial Natural Science Foundation of China (LH2020F028); Fundamental Research Funds for the Central Universities (3072022TS2504); 111 Project (B13015); Heilongjiang Touyan Innovation Team Program; Science Foundation Ireland under the Centres research program for the MaREI project (SFI/12/RC/2302_P2)

Creative Commons License

Creative Commons Attribution-Share Alike 4.0 International License
This work is licensed under a Creative Commons Attribution-Share Alike 4.0 International License.

Download


Share

COinS