吉林大学 仪器科学与电气工程学院 测试计量技术及仪器系, 长春 130026
为了降低布里渊后向散射光不稳定的偏振态以及系统噪声对分布式光纤温度应变传感系统测量精度的影响, 进一步提高测量温度、应变的精度和系统信噪比, 提出在该系统中加入扰偏器, 以减小系统误差; 同时应用小波去噪的方式降低信号的噪声。选用体积和插入损耗都较小的PolaRITETMⅢ PSM-001扰偏器。小波去噪过程选用 db5 小波, 经过离散小波变换函数wavedec对信号进行小波分解, 选用thselect 函数实现阈值获取, 选用waverec函数实现信号小波重构。实验证明扰偏器能使系统误差降低到原来的 1/3, 小波去噪使系统信噪比从原来的26.6dB 提高到 38.5dB。
光纤传感 去噪 扰偏器 小波去噪 温度应变传感 optical fiber sensing system denoising polarization scrambler wavelet denoising temperature strain sensing
Author Affiliations
Abstract
Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications, Ministry of Education, Beijing 100876, China
The combination of fast polarization scrambler (FPS) and forward error correction (FEC) is one of the methods to mitigate the polarization mode dispersion (PMD) in high-speed optical fiber communication systems. The effect of the different distribution patterns of FPS on PMD mitigation with FEC is investigated. A comparison of the bit error rates (BERs) between two cases where the distributed FPS is absent and present along the fiber is carried out by simulation. A novel representation called the "ring chart" to assess the performance of different distribution patterns intuitively is proposed. The results show that the distribution pattern is an impact factor for this PMD mitigation scheme.
偏振模色散缓解 前向纠错 快速扰偏器 分布模式 060.0060 Fiber optics and optical communications 230.0230 Optical devices 250.0250 Optoelectronics Chinese Optics Letters
2011, 9(7): 070604
