Optical fiber technologies are widely engaged in variety of industries, machines and production lines due to their precise results and low cost. Optical sensors are fabricated using different types of optical fibers. In this paper, a new fabrication approach of, in-fiber, tunable Mach–Zehnder interferometer with dual micro-cavities using a photonic crystal fiber (PCF) has been proposed for load measurement application. A large mode area (LMA-10) PCF is used to splice between two equal lengths of single-mode fibers using fusion splicing technique. Different parameters such as arc power, length of the PCF and the overlap gap between samples have been considered to control the fabrication process. Ellipsoidal shape micro-cavities were experimentally achieved parallel to the propagation axis having dimensions of (24.92–62.32) µm of width and (3.82–18.2) µm of length. Results showed that higher sensitivity values of 0.15 nm/N and 0.32 nm/N were achieved with elliptical width of 18.2 µm. The simplicity of sensor fabrication process, controlled parameters of cavity creation, small and compact size and high sensitivity of large mode area that the PCFs exhibit, add more advantage for load measurement applications.

中文翻译：

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基于双微腔光子晶体光纤的可调谐马赫曾德尔干涉仪，用于负载测量

光纤技术因其精确的结果和低成本而广泛应用于各种行业，机器和生产线。使用不同类型的光纤来制造光学传感器。在本文中，提出了一种采用光子晶体光纤（PCF）的具有双微腔的光纤内可调谐Mach-Zehnder干涉仪的新制造方法，用于负载测量应用。大模面积（LMA-10）PCF用于通过融合拼接技术在两个等长的单模光纤之间进行拼接。已经考虑了诸如电弧功率，PCF的长度以及样品之间的重叠间隙之类的不同参数来控制制造过程。椭圆形微腔是通过实验实现的，其平行于传播轴的尺寸为宽度（24.92–62.32）µm，宽度为（3.82–18）。2）长度为µm。结果表明，椭圆宽度为18.2 µm时，灵敏度更高，分别为0.15 nm / N和0.32 nm / N。PCF表现出的传感器制造过程的简单性，空腔生成的受控参数，小巧紧凑的尺寸以及PCF所展现的大模式区域的高灵敏度，为负载测量应用增加了更多优势。