Yang Fan, Zhang Wenjia, Zhao Shuangxiang, Liu Qingwen, Tao Jifang, He Zuyuan
Opt Express. 2019 Mar 4;27(5):6037-6046. doi: 10.1364/OE.27.006037.
We present a high-resolution and miniature multi-wavelength Fiber Bragg Grating (FBG) interrogator based on a thermally tunable microring resonator (MRR) array. A phase detection method using dithering signals is exploited to generate an antisymmetric error signal curve, which is utilized for the feedback locking of the MRR with the FBG sensor. Dynamic strain sensing of both single FBG and multiple FBGs are experimentally demonstrated, with a dynamic strain resolution of 30 nε/√Hz over 100 Hz to 1 kHz. The proposed interrogator shows the great improvements in both resolution and wavelength accuracy compared with the reported MRR-based interrogators and is promising for scalable multiplexed sensing applications.
我们展示了一种基于热可调微环谐振器（MRR）阵列的高分辨率微型多波长光纤布拉格光栅（FBG）询问器。利用一种使用抖动信号的相位检测方法来生成反对称误差信号曲线，该曲线用于MRR与FBG传感器的反馈锁定。通过实验证明了单FBG和多FBG的动态应变传感，在100 Hz至1 kHz范围内动态应变分辨率为30 nε/√Hz。与已报道的基于MRR的询问器相比，所提出的询问器在分辨率和波长精度方面都有很大提高，有望用于可扩展的多路复用传感应用。
