摘要
采用光束传播法(BPM),对单模-多模-单模(SMS)光纤结构内部传输光场分布情况,进行数值模拟;分析了SMS光纤结构中不同的多模光纤长度,多模光纤纤芯直径和输入光波长对光纤结构内部传输光场分布情况的影响,以及所得透射谱的变化规律;进一步探讨了基于多模干涉理论的SMS光纤结构传感器在各传感领域的应用潜力.最后,以基于多模干涉理论的SMS光纤结构折射率传感器为例,分析了多模光纤纤芯外界折射率的改变对光纤结构输出透射谱的影响,并进行实验加以验证.实验结果与仿真模拟结论一致,从而验证了模拟的准确性.
A calculation model of light distribution in multimode-interference based on single-mode-multimode-single-mode fiber structure was presented by using beam propagation method.A detailed simulation study of this structure in terms of the length of the multimode fiber core,the diameter of the multimode fiber core,the wavelength of the input light has been carried out.In addition,the possibility of SMS fiber structure using as fiber sensor was predicted.Furthermore,the transmission spectra of the structure for various surrounding refractive index medium were analyzed.The results show that it is consistent with the experimental findings qualitatively.
出处
《中国计量学院学报》
2011年第4期349-355,共7页
Journal of China Jiliang University
基金
浙江省科技厅重大项目资助(No.2008C13041-1)
关键词
多模干涉
模拟
光束传播法
光纤传感
折射率测量
multimode interference
simulation
BPM
fiber sensor
refractive index measurement
