Miniaturized fiber-Bragg-grating (FBG) interrogators are of interest for applications in the areas where weight and size controlling is important, e.g., airplanes and aerospace or in-situ monitoring. An ultra-compact high-precision on-chip interrogator is proposed based on a tailored arrayed waveguide grating (AWG) on a silicon-on-insulator (SOI) platform. The on-chip interrogator enables continuous wavelength interrogation from 1 544 nm to 1 568 nm with the wavelength accuracy of less than 1 pm [the root-mean-square error (RMSE) is 0.73 pm] over the whole wavelength range. The chip loss is less than 5 dB. The 1 × 16 AWG is optimized to achieve a large bandwidth and a low noise level at each channel, and the FBG reflection peaks can be detected by multiple output channels of the AWG. The fabricated AWG is utilized to interrogate FBG sensors through the center of gravity (CoG) algorithm. The validation of an on-chip FBG interrogator that works with sub-picometer wavelength accuracy in a broad wavelength range shows large potential for applications in miniaturized fiber optic sensing systems.

针对脉搏波信号采集过程中存在噪声的问题，提出了基于改进互补集成经验模态分解的脉搏波去噪算法。利用光纤布拉格光栅传感器获取脉搏波信号，首先在互补集成经验模态分解算法中加入高斯白噪声，然后利用粒子群算法优化高斯白噪声幅值，以此来消除互补集成经验模态算法分解产生的模态混叠现象，并联合小波阈值函数对其处理后的脉搏波信号进行重构。实验结果表明，所提算法能够有效降低脉搏波信号中的噪声干扰，在信噪比、均方误差两个指标上均优于对比算法，为提取脉搏波的时域特征奠定了基础。

半导体激光器在光通信、生物医疗、激光雷达等领域中得到广泛应用，其单模稳定输出特性一直是国内外的研究热点。制备了一种基于表面高阶曲线光栅的宽脊波导半导体激光器，刻蚀曲线型高阶光栅后高阶横模损耗远大于基横模损耗，同时设置宽脊电流限制注入结构，使得高阶横模激射阈值高于基横模阈值，从而改善器件的横模特性并压窄光谱线宽。利用温控模块将器件的工作温度控制为18 ℃，对腔长为2 mm、条宽为500 μm的器件进行测试，在0.5 A电流下测得慢轴发散角为5.3°，快轴发散角为29.2°，在1 A驱动电流下测得3 dB光谱线宽为0.173 nm，边模抑制比为22.6 dB。实验结果表明，表面高阶曲线光栅对宽脊波导半导体激光器中的高阶横模起到了抑制作用且能够压窄光谱线宽，有助于实现半导体激光器的单模稳定输出，同时器件采用紫外光刻工艺，大幅降低了器件的制备难度。