Cheung Yang, Jing Zhenguo, Cao Pengdong, Jiang Feng, Zhou Da-Peng, Peng Wei
Opt Lett. 2024 Aug 15;49(16):4685-4688. doi: 10.1364/OL.533720.
All-solid, open-cavity fiber optic Fabry-Perot etalon (FPE) sensors possess a wide static pressure detection range, yet their low sensitivity significantly restricts their application. This study proposes a programmable Vernier effect to improve the gas pressure sensitivity of FPE sensors substantially. By effectively modulating the emission spectrum of a widely tunable laser using a variable optical attenuator (VOA), the emission spectrum at different modulation lengths is expected to produce an optical beating in conjunction with the transmission spectrum of the FPE sensor, thereby realizing the Vernier effect. Experimental results indicate that by utilizing the proposed programmable Vernier effect, the pressure sensitivity of the FPE sensor has increased to -612.21 pm/kPa, demonstrating an amplification in sensitivity of approximately -153 times, consistent with the theoretical results. Owing to the programmable Vernier effect, which flexibly enhances the sensitivity of the FPE sensor, this sensor demonstrates considerable potential for gas pressure monitoring under various extreme conditions.
全固态、开放式腔光纤法布里-珀罗干涉仪（FPE）传感器具有较宽的静压检测范围，但其低灵敏度严重限制了它们的应用。本研究提出一种可编程的游标效应，以大幅提高FPE传感器的气压灵敏度。通过使用可变光衰减器（VOA）有效调制宽可调谐激光器的发射光谱，预期不同调制长度下的发射光谱会与FPE传感器的透射光谱产生光学拍频，从而实现游标效应。实验结果表明，利用所提出的可编程游标效应，FPE传感器的压力灵敏度已提高到-612.21 pm/kPa，灵敏度放大了约-153倍，与理论结果一致。由于可编程游标效应灵活地提高了FPE传感器的灵敏度，该传感器在各种极端条件下的气压监测方面显示出巨大潜力。
