| Citation: | DU Chao, ZHAO Shuang, SONG Hua-ke, WANG Qiu-yu, JIA Bin, ZHANG Li, CUI Li-qin, ZHAO Qiang, DENG Xiao. A seawater salinity sensor based on dual peaks resonance long period fiber grating[J]. Chinese Optics, 2024, 17(2): 291-299. doi: 10.37188/CO.2023-0101
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To develop a highly sensitive seawater salinity sensor, a long period fiber grating (LPFG) was successfully fabricated using CO2 laser technology to function in close proximity to the dispersion turning point (DTP). An LPFG operating near DTP was fabricated in an 80 μm single mode fiber using CO2 laser micromachining technology. This successful endeavor demonstrates the feasibility of developing LPFG with shorter grating period using CO2 laser micromaching technology. LPFGs with varying periods were fabricated by adjusting the preparation period of CO2 laser to ensure that the cladding mode LP1,9 was operating near DTP, resulting in higher refractive index sensitivity of LPFG. The average sensitivity of 0.279 nm/‰ can be achieved in the seawater with salinity ranging from 5.001‰ to 39.996‰, especially with the dual peaks resonance LPFG at a period of 115.4 μm, thanks to the dual peaks resonance effect. The dual peaks resonance LPFG seawater salinity sensor exhibits high sensitivity and a large attenuation loss, suggesting potential application in seawater salinity monitoring.
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