Theoretical Analysis of Silicon-Based Integrated-Optic Mach-Zehnder Pressure Sensors

Silicon-based Mach–Zehnder integrated-optic pressure sensors are investigated in this article. Several structures proposed in the literature are examined and performance parameters such as power leakage towards the Si substrate, radiation loss as a function of the Y-junction aperture angle, and halfwave pressure are analyzed. Modeling of the material deformation characteristics and refractive index change as a function of the applied pressure is carried out by using the finite-difference technique. The sensor optical characteristics and waveguiding properties are computed by using the finite-difference beam-propagation method (FD-BPM) and the extended effective index method (EEIM). Guidelines for performance optimization are proposed.     

全硅矩形截面脊形波导的研制及其损耗分析

运用有效折射率法和微分法分别对全硅矩形截面脊形波导的模式特性和模吸收损耗系数作了分析，通过乙二胺－邻苯二酚水溶液（ＥＰＷ）各向异性腐蚀的方法，研制成了矩形截面脊形全硅光波导，并对其损耗特性进行了研究和讨论。     

Theoretical Analysis of Silicon-Based Integrated-Optic Mach-Zehnder Pressure Sensors

Silicon-based Mach-Zehnder integrated-optic pressure sensors are investigated in this article. Several structures proposed in the literature are examined and performance parameters such as power leakage towards the Si substrate, radiation loss as a function of the Y-junction aperture angle, and halfwave pressure are analyzed. Modeling of the material deformation characteristics and refractive index change as a function of the applied pressure is carried out by using the finite-difference technique. The sensor optical characteristics and waveguiding properties are computed by using the finite-difference beam-propagation method (FD-BPM) and the extended effective index method (EEIM). Guidelines for performance optimization are proposed.     

小芯径掺铒光纤与单模光纤低损耗接续的研究

报道了掺铒光纤放大器中降低掺铒光纤与单模光纤接续损耗的一种新方法，采用在芯区直径较小的掺铒光纤端部拉锥的方法，使得掺铒光纤中的传输模场在锥形区域内扩散，从而与单模光纤中直径较大的本征模场良好匹配，实现低损耗接续，初步实验结果表明，该方法可获得小于１ｄＢ的接续损耗。