随机信号相关法测量多模光纤差分模延迟  

Differential Mode Delay Measurement for Multimode Fibers Using Random Signal Correlation Technique

作　　者：阚杰[1] 王安帮[1] 徐航[1] 张建国[1] 王云才[1] 

机构地区：[1]太原理工大学物理与光电工程学院,光电工程研究所,新型传感器与智能控制教育部重点实验室,山西太原030024

出　　处：《中国激光》2013年第7期116-121,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(60908014);山西省科技攻关项目(20100321055-02);国家自然基金科学仪器专项(60927007);山西省回国留学人员重点科研项目

摘　　要：提出了一种基于宽带随机信号测量多模光纤差分模延迟的方法。该方法将放大自发辐射(ASE)光信号分成两路,分别作为参考光与探测光,参考光与经过多模光纤传输后的探测光进行互相关,根据相关曲线峰值的位置可成功测量多模光纤差分模延迟。实验测量了不同长度多模光纤的差分模延迟,并分析了测量信噪比。结果表明,该方法在限模注入下测得待测光纤的差分模延迟系数为0.61ps/m,具有较高的测量信噪比,当相关曲线峰值旁瓣水平为3.16dB时,信号强度仅为噪声强度的5.3%。An approach to measure differential mode delay of multimode fibers based on broadband random signal is proposed. An amplified spontaneous emission （ASE） signal is divided into two beams, with one serving as the probe light and the other as the reference light. By correlating the reference light and the probe light transmitted through the multimode fiber, the differential mode delay is obtained by the correlation peaks. Differential mode delay for multimode fibers with different lengths is experimentally measured, and the signal-to-noise ratio of measurement is analyzed. Results show that the differential mode delay coefficient is 0.61 ps/m for the restricted mode launch condition. When the peak sidelobe level is 3.16 dB, the probe signal intensity is only 5.3% of the noise intensity.

关 键 词：光纤光学 时延测量 相关法 差分模延迟 

分 类 号：TN929.11[电子电信—通信与信息系统]