Author Affiliations
Abstract
1 Key Laboratory of Optoelectronics Information Technology, Institute of Optical Fiber Sensing of Tianjin University, MEC, Tianjin 300072, China
2 School of Computer and Information Engineering, Tianjin Chengjian University, Tianjin 300384, China
A new wavelength division multiplexing method for fiber Bragg grating (FBG) sensors based on spectrum profile identification is proposed. In this method, FBGs and tilted FBG (TFBG) sensors are cascaded in a single fiber in one sensing channel. The different spectrum profiles enable the cross-correlation method to demodulate the wavelength. Therefore, the different types of sensors can occupy the same central wavelength band. Using this method, the multiplexing capacity is optimized. Experiment results demonstrate the feasibility of this method and it is useful for applications where large numbers of FBGs are needed.
060.0060 Fiber optics and optical communications 060.3735 Fiber Bragg gratings 060.2370 Fiber optics sensors Chinese Optics Letters
2017, 15(7): 070605
波导式光学吸收腔在气体和液体浓度测量等领域有广泛的应用前景。空芯光纤作为光学吸收腔具有很多优点。空芯光纤的参数与传感系统的性能有直接的关系。提出了一种能同时考虑空芯光纤的损耗和系统信噪比的数学模型。从理论上分析了光纤的长度、内径、目标气体浓度以及输入光场能量分布等因素对传感系统信号输出强度和灵敏度的影响。给出的最优化参数为提高系统灵敏度和补偿系统误差提供了参考。
光学器件 空芯光纤 优化设计 吸收光谱传感 信噪比
