摘要
光开关是时分复用光纤检波器阵列的重要器件,对阵列串扰有着不可忽视的影响。在基于差分延时外差的解调方案下,分析了光纤检波器阵列中串扰的来源,推导了有限消光比下检波器所受串扰的表达式。通过仿真得到了在不同的阵列规模下,光开关消光比与检波器串扰之间的关系,即串扰基本随着光开关消光比增大而线性减小,随着阵列规模增大而线性增大。实验中搭建了8基元的检波器阵列,采用具有不同消光比的光开关(声光调制器和电光调制器)产生脉冲光信号,验证了理论推导以及仿真结果的正确性。
Optical switch is one of the key components in the time-division multiplexing fiber-optic seismometer array and has significant influence on the crosstalk of the array.The source of crosstalk in the array was analyzed based on differential delay heterodyne demodulation scheme.The expression of crosstalk appearing in the seismometer’s output was deduced with the limited extinction ratio.Via simulation,the relationship between the extinction ratio of optical switch and the seismometer’s crosstalk was presented under different array scales,i.e.basically the crosstalk decreases linearly with the increase of optical switch’s extinction ratio,and increases linearly with the increase of the array scale.Finally,an 8-element fiber-optic seismometer array was set up in the experiment,on which different optical switches(acousto-optic modulator and electro-optic modulator)owning distinct extinction ratios could be applied to generate pulse light.Experimental results verified the theoretical analysis as well as the simulation results.
作者
刘飞
周娴
张敏
LIU Fei;ZHOU Xian;ZHANG Min(School of Computer and Communication Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing International Center for Gas Hydrate,Peking University,Beijing 100871,China;Dongguan Institute of Opto-electronics,Peking University,Dongguan 523808,China)
出处
《物联网学报》
2022年第4期65-71,共7页
Chinese Journal on Internet of Things
基金
国家自然科学基金资助项目(No.61905004)
中央高校基本科研业务费资助项目(No.FRF-TP-20-067A1Z)。
关键词
光纤检波器阵列
时分复用
消光比
串扰
fiber-optic seismometer array
time-division multiplexing
extinction ratio
crosstalk
