Abstract A Mach-Zehnder interferometer (MZI) based on tapered photonic crystal fiber (PCF) for simultaneous temperature and relative humidity (RH) is proposed. It consists of two sections of single-mode fiber (SMF) fused with a section of tapered PCF. The temperature and RH sensitivities are improved by adding a taper in the middle of the PCF. The experimental results show that the temperature sensitivities are 0.061 nm/°C and 0.028 nm/°C from 30 °C to 90 °C, respectively. The RH sensitivities are 0.039 nm/%RH and 0.032 nm/%RH from 30%RH to 70%RH, respectively. The simultaneous measurement of temperature and RH can be achieved by calculating the sensitivity coefficients matrix. This MZI has the superiorities of high sensitivity, good repeatability, simple fabrication, and compact size.

中文翻译：

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基于锥形PCF Mach-Zehnder干涉仪的温湿度同步测量研究

摘要 提出了一种基于锥形光子晶体光纤（PCF）的马赫-曾德干涉仪（MZI），用于同步温度和相对湿度（RH）。它由两段单模光纤 (SMF) 和一段锥形 PCF 组成。通过在 PCF 中间增加一个锥度，温度和 RH 灵敏度得到改善。实验结果表明，从 30°C 到 90°C，温度灵敏度分别为 0.061 nm/°C 和 0.028 nm/°C。从 30%RH 到 70%RH，RH 灵敏度分别为 0.039 nm/%RH 和 0.032 nm/%RH。通过计算灵敏度系数矩阵可以实现温度和相对湿度的同时测量。该MZI具有灵敏度高、重复性好、制作简单、体积小巧等优点。