Based on the Vernier effect and the Sagnac interference characteristics of polarization-maintaining photonic crystal fibers, a separate pressure sensing structure using an F-P cavity to enhance sensitivity is proposed. The experiment results show that using 40.2 cm long polarization maintaining photonic crystal fiber as the sensing element, the pressure sensitivity of the sensitizing structure at 1560 nm increased from 5.03 nm/MPa of a single Sagnac sensing structure to 31.73 nm/MPa. This sensor has simple structure, easy preparation, and it can flexibly adjust the measurement sensitivity by changing the cavity length of the sensitizing F-P cavity.

中文翻译：

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基于Sagnac和FP干涉仪的全光纤灵敏度增强压力传感器

基于游标效应和保偏光子晶体光纤的萨格纳克干涉特性，提出了一种利用FP腔提高灵敏度的独立压力传感结构。实验结果表明，采用40.2 cm长保偏光子晶体光纤作为传感元件，敏化结构在1560 nm处的压敏度从单一Sagnac传感结构的5.03 nm/MPa提高到31.73 nm/MPa。该传感器结构简单，制备容易，可通过改变敏化FP腔的腔长，灵活调节测量灵敏度。