分布式光纤传感系统相位还原的色散特性  

Dispersion on Distributed Fiber-Optic Sensing System for Phase Retrieval

作　　者：陈小莉[1] 周鹏威[1] 彭和阔 贾波[1] 肖倩[1] 

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《复旦学报（自然科学版）》2016年第6期772-777,共6页Journal of Fudan University：Natural Science

基　　金：国家重大科学仪器设备开发专项项目(2012YQ150213;2014YQ090709);上海市科委项目(15XD1500100;14DZ2281200;14dz1206702;14511101800)

摘　　要：在强度调制型光纤传感系统中,光脉冲的传播会受色散的影响而产生展宽效应.为了研究色散对相位调制型光纤传感系统相位传输特性的影响,本文对该系统获得的相位信号受色散的影响进行研究评估.该研究是基于宽光谱白光光源Sagnac结构的分布式光纤传感系统,分别使用正弦信号和脉冲信号对在不同长度传感光纤里传输的光进行相位调制,并还原出相应的相位调制信号;作为对比,在另一强度调制型光纤传感系统中,用相同参数的脉冲信号对在不同长度传感光纤里传输的光进行强度调制.结果显示,在强度调制型光纤传感系统中获得的脉冲信号会发生明显的展宽,但在相位调制型光纤传感系统中还原出的相位调制信号脉宽展宽明显小于强度调制型系统.In intensity-modulated system,the pulse signal propagation is affected by dispersion,resulting in pulse broadening.In order to study the effects of dispersion on the phase transmission characteristics in the same system,this paper evaluates the effects of dispersion on phase signal.The study is based on a distributed optical fiber sensing system along a Sagnac structure,and the white light source is also used in the system,the light transmitting in the sensor fibers with different lengths is modulated respectively by sinusoidal signal and pulse signal,and the phase-modulated signal will be retrieved from the phase-composed signal.As a comparison,in another intensity-modulated fiber sensing system,apulse signal having the same parameters will also modulate the light transmitting in sensor fibers with different lengths.The results show that the broadening of the pulse signal in intensity-modulated fiber sensing system is very obvious,but the pulse broadening of the phase-modulated signal is obviously less than the intensity modulation systems.

关 键 词：色散 白光光源 分布式光纤传感 干涉 相位传输 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]