CAJ | 학술논문

基于暗脉冲的布里渊时域分析仪系统中泵浦光和探测光的功率较高,相互作用强烈,严重限制了系统的有效传感距离.而现有的系统众多采用利用多段具有不同布里渊散射频率的光纤相互连接延长传感距离的方法,降低每段光纤上的受激布里渊散射效应,延长有效传感距离,但这种方案会增加的系统的复杂度,影响实际应用.本文提出一种简单的暗脉冲光布里渊时域分析仪的结构,可在满足高空间分辨率的条件下,有效的延长系统的传感距离,取代通常的利用多段具有不同布里渊散射频率的光纤相互连接延长传感距离的方法.利用基于光抑制载波的技术,产生具有两个边带的斯托克斯光.斯托克斯光的两个边带和泵浦光相互作用,同时激发布里渊散射增益和衰减效应,在接收端利用两者接收信号的差,可抵消原有暗脉冲泵浦信号中准连续光对传感距离的影响,从而有效地延长系统的传感距离,并利用数值仿真的方法验证了此方法的有效性.
기우암맥충적포리연시역분석의계통중빙포광화탐측광적공솔교고,상호작용강렬,엄중한제료계통적유효전감거리.이현유적계통음다채용이용다단구유불동포리연산사빈솔적광섬상호련접연장전감거리적방법,강저매단광섬상적수격포리연산사효응,연장유효전감거리,단저충방안회증가적계통적복잡도,영향실제응용.본문제출일충간단적암맥충광포리연시역분석의적결구,가재만족고공간분변솔적조건하,유효적연장계통적전감거리,취대통상적이용다단구유불동포리연산사빈솔적광섬상호련접연장전감거리적방법.이용기우광억제재파적기술,산생구유량개변대적사탁극사광.사탁극사광적량개변대화빙포광상호작용,동시격발포리연산사증익화쇠감효응,재접수단이용량자접수신호적차,가저소원유암맥충빙포신호중준련속광대전감거리적영향,종이유효지연장계통적전감거리,병이용수치방진적방법험증료차방법적유효성.
In dark-pulse Brillouin optical time domain analyzer (DP-BOTDA) DP-BOTDA the effective sensing length is greatly limited by the severe interaction between the Quasi-CW pump light and pump light.A simple DP-BOTDA was proposed to prolong the total sensing length without using multi-section fibers.To mitigate the impact of the high power Quasi-CW pump light,both Brillouin gain and loss effect along fiber were measured simultaneously in this scheme,yielding the Brillouin signal by subtracting the two side bands of the optical carrier suppressed (OCS) Stokes light.Based on this proposal,the total sensing length in DP-BOTDA could be increased.Simulations and discussions were conducted to validate the proposal,and the results are useful for designing high spatial resolution distributed Brillouin fiber sensor.