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Abstract
A special open-cavity Mach–Zehnder salinity sensor is presented and verified in this Letter, which has obvious advantages in salinity sensitivity and loss. The open-cavity structure is composed of a short section of etched double-side hole fiber spliced between a pair of multimode fibers and connected in series between a pair of single-mode fibers, which is the SMF-MMF-etched DSHF-MMF-SMF structure proposed in the paper. According to the experiment results, when the cavity length is about 100 µm, the salinity sensitivity of the sensing probe can reach 2 nm/‰, and its refractive index (RI) sensitivity can be more than 10,000 nm/RIU, while having a low loss of ${-}{15}\;{\rm dB}$ and a detection limit of 0.23‰. Based on its characteristics, the sensor is a prospective online monitor of ocean salinity. At the same time, it also provides a low-cost way to construct an open cavity instead of femtosecond inscribing.
© 2021 Optical Society of America
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Ziting Lin, Riqing Lv, Yong Zhao, Hongkun Zheng, and Xixin Wang, "High-sensitivity special open-cavity Mach–Zehnder structure for salinity measurement based on etched double-side hole fiber: publisher’s note," Opt. Lett. 46, 3069-3069 (2021)https://opg.optica.org/ol/abstract.cfm?uri=ol-46-13-3069
1 June 2021: Minor corrections were made to the text on pp. 2714–2717.
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