Integrated Fiber-Optic Salinity and Temperature Sensor Based on Hybrid Dual Microcavity

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Abstract
In this paper, a novel hybrid-dual-microcavity (h-DMC) structure is proposed for the first time in order to achieve simultaneous salinity and temperature measurement with high sensitivity and high discrimination. The h-DMC structure is completed by proper arc-discharged large lateral-offset splicing and full-filling the temperature sensitive polymer. Based on the shared cladding, two parallel micro-cavity Mach-Zehnder interferometers are formed and respectively used to monitor the salinity and temperature variations of solution. The obtained superimposed transmission spectra are easily decoupled and precisely re-constructed due to the obvious spatial frequency difference. The average sensitivities of h-DMC can reach −2.34 nm/‰ and 5.26 nm/°C with high linearity and low measured errors, which correspond to the detection limit of 0.0085 ‰ and 0.0038 °C, respectively. Due to the merits of low cost and high yield, such an integrated fiber-optic dual-parameter sensor is very competitive and promising to high-precision marine environment monitoring.
Funding Information
  • Basic Research Business Funding of Heilongjiang Provincial Universities (2021-KYYWF-0028, 2022-KYYWF-1085)
  • Cultivation project of Double First-class initiative discipline by Heilongjiang Province (LJGXCG2023-091)
  • Project of The Central Government Supporting The Reform and Development of Local Colleges and Universities (2020YQ01)

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