Characterization of Distributed Brillouin Sensors Based on Elliptical-Core Two-Mode Fiber
| Autor: | Yong Hyun Kim, Kwang Yong Song |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | IEEE Sensors Journal. 19:2155-2161 |
| ISSN: | 2379-9153 1530-437X |
| DOI: | 10.1109/jsen.2018.2885573 |
| Popis: | Distributed Brillouin sensors based on the intramodal and intermodal stimulated Brillouin scattering (SBS) of the LP01 and LP11 guided modes in an elliptical-core two-mode fiber (e-core TMF) are investigated and characterized. The strain and temperature dependence of the Brillouin frequency ( $\nu _{\mathbf {B}}$ ) for each intramodal and intermodal SBS is measured, and the feasibility of distributed sensors based on the e-core TMF is tested. As an application of intermodal SBS, the Brillouin optical time-domain analysis with an LP01 mode probe and LP11 mode pump waves is demonstrated, which can simultaneously measure the distribution of $\nu _{\mathbf {B}}$ and the propagation loss of the LP11 mode. The strain and temperature coefficients of the double-peak Brillouin gain spectrum observed in the intramodal SBS of the LP11 mode are separately measured for each peak by applying a Brillouin optical correlation domain analysis with a differential measurement scheme. The experimental results show that e-core TMF can be used as a robust platform for distributed Brillouin sensors with strain and temperature coefficients of $\nu _{\mathbf {B}}$ in the intramodal and intermodal SBS very close to each other, with a discrepancy less than 1%. |
| Databáze: | OpenAIRE |
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