摘要
本文利用瑞利散射原理分析了脉冲信号和脉宽大于、小于回波时间的方波信号的回波信号波形,并利用数值模拟得到了其理论波形图。根据原理自主搭建了一套光纤光时域反射仪(Optic Time Domain Reflectometer,简称OTDR),用通信中通用的1550nm激光波长对样品光纤进行了实际测量,得到了与理论模拟完全一致的实测波形。通过对实测波形进行降噪处理得到了高精度的长度测量值和损耗测量值。长度测量的相对误差仅为0.0085%,与直接测量值比较,光纤传输损耗的相对误差为0.086%,理论与实验表明该OTDR系统完全可以与工程用的OTDR系统相媲美,在工程技术和教学研究中具有一定的应用前景。
The theory of Rayleigh diffraction is used in this paper to analyze the waveform of the reflecting signal of three different kinds of input signal： pulse signal and rectangular signal.The experiment platform for the optic time domain reflectometer is established to detect the reflecting signal of a laser rectangular signal with a wavelength of 1550nm.The oscilloscope trace indicates that the experimental result is identical with that of theory analysis.By using the noise eliminating technology,the length and transmission loss of the fiber is obtained with a high accuracy,the relative errors of which are 0.0085% and 0.086% respectively.Theory analysis and experimental result all indicate that the OTDR proposed in this paper has an excellent performance,which promises an application prospect in engineering,teaching demonstration and researching.
出处
《激光杂志》
CAS
CSCD
北大核心
2010年第5期31-32,共2页
Laser Journal
基金
江西省教育厅(JXJG-08-15-28)资助课题
