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Compact assembly-free vector bend sensor based on all-in-fiber-core Mach–Zehnder interferometer
- Source :
- Optics Letters; February 2018, Vol. 43 Issue: 3 p531-534, 4p
- Publication Year :
- 2018
-
Abstract
- A novel low-cost, compact, assembly-free and sensitive optical fiber curvature sensor is presented. This device consists of an off-axis positive refractive index modified zone (PRIMZ), induced by a direct femtosecond laser, written in a single-mode fiber (SMF) core. The PRIMZ transforms the original SMF section into a few-mode fiber (FMF). As a result, the whole fiber forms an assembly-free “SMF-FMF-SMF” sandwich Mach–Zehnder interferometer. When the device is bent, a direction-dependent spectral shift of the interference pattern is produced. The sensitivity of the sensor is up to 2.53 and 2.24 nm/m^−1 for the 0° and 180° orientations in a wide bend range (from 0 to 4 m^−1). In addition, the device is immune to the surrounding refractive index and has a low-temperature crosstalk, which makes it very attractive for practical structural monitoring applications.
Details
- Language :
- English
- ISSN :
- 01469592 and 15394794
- Volume :
- 43
- Issue :
- 3
- Database :
- Supplemental Index
- Journal :
- Optics Letters
- Publication Type :
- Periodical
- Accession number :
- ejs44566398