Simultaneous measurement of axial strain and temperature based on twisted fiber structure

In this Letter, an alternative solution is proposed and demonstrated for simultaneous measurement of axial strain and temperature. This sensor consists of two twisted points on a commercial single mode fiber introduced by flame-heated and rotation treatment. The fabrication process modifies the geometrical configuration and refractive index of the fiber. Different cladding modes are excited at the first twisted point, and part of them are coupled back to the fiber core at the second twisted point. Experimental results show distinct sensitivities of 34.9 pm/με with 49.23 pm/℃ and -36.19 pm/με with 62.99 pm/℃ for the two selected destructive interference wavelengths.     

模糊物元法在优化噪声监测布点中的应用

通过建立模糊物元矩阵和权重矩阵,计算各点位之间的关联度及综合关联度。依据综合关联度值及该区域的噪声来源,对噪声监测点进行分类、优选。在保持反映实际环境噪声的情况下,简化噪声监测布点,减少监测工作量。     

新型直波导阵列波导光栅的设计与仿真

提出了一种基于直波导的新型阵列波导光栅(AWG).与常规阵列波导光栅器件相比,该方法简化了器件结构与制备工艺,有望提高器件成品率,降低器件制作成本.器件的输入/输出耦合器采用自聚焦平板波导(GISLAB),其输入/输出均为平端面.阵列波导采用直波导取代常规AWG的弯曲波导,可采用光敏平板波导材料通过两次紫外写入实现.采用半矢量光束传输法对器件进行模拟,结果表明该器件可以实现多波长的解复用,其解复用的信道间隔为3.2 am,输出光谱非均匀性约为1.6 dB.