Tian Ke, Zhang Mingyuan, Zhao Zhiyuan, Wang Ruoning, Liu Dejun, Wang Xin, Lewis Elfed, Farrell Gerald, Wang Pengfei
Opt Lett. 2021 Nov 15;46(22):5595-5598. doi: 10.1364/OL.440118.
An ultra-compact in-core-parallel-written fiber Bragg grating (FBG) and Mach-Zehnder interferometer (MZI) for simultaneous measurement of strain and temperature is described. The FBG and MZI are written spatially parallel in the same section of fiber core using a femtosecond laser, forming an ultra-compact device, which is different from the previously developed axial cascade of different structures. Due to the weak coupling between the FBG and the MZI, their individual extinction ratios are traded off by optimizing their writing position and separation, and extinction ratios of 5.9 dB for the FBG and 10 dB for the MZI are achieved. Experimental results show that the FBG and MZI have different sensitivities for strain and temperature, allowing this device to measure strain and temperature simultaneously. In addition, since both the FBG and MZI are written in the fiber core, this ultra-compact device is proven to be impervious to ambient humidity, making it a promising candidate for accurate industrial strain and temperature measurements.
本文描述了一种用于同时测量应变和温度的超紧凑型芯内并行写入光纤布拉格光栅（FBG）和马赫曾德尔干涉仪（MZI）。FBG和MZI使用飞秒激光在光纤芯的同一部分进行空间并行写入，形成一个超紧凑型器件，这与先前开发的不同结构的轴向级联不同。由于FBG和MZI之间的耦合较弱，通过优化它们的写入位置和间距来权衡它们各自的消光比，FBG的消光比达到5.9 dB，MZI的消光比达到10 dB。实验结果表明，FBG和MZI对应变和温度具有不同的灵敏度，使得该器件能够同时测量应变和温度。此外，由于FBG和MZI都写入光纤芯中，这种超紧凑型器件被证明不受环境湿度影响，使其成为精确工业应变和温度测量的有前途的候选者。
