摘要
本文提出了一种新型基于薄膜铌酸锂(thin-film lithium niobate, TFLN)脊型光波导微纳结构的光纤布拉格光栅(fiber Bragg grating, FBG)传感系统,其核心器件是集成了一个基于非平衡Mach-Zehnder干涉仪(March-Zehnder interferometer, MZI)的电光布拉格偏转调制器(electro-optic Bragg deflection modulation, EOBDM)。利用非平衡Mach-Zehnder结构将FBG中心波长的漂移转化为相位调制,并通过电光调制转化为强度调制,从而完成波长解调。采用有限元方法,当中心波长为1.55μm时,非平衡MZI的半波电压为29.4 V,解调效率为2.03 V·cm,器件消光比大于54 dB。EOBDM的最大衍射效率为68%,远高于本系统所需的衍射强度。通过片上集成化设计,相比传统解调系统,该系统有效减少了体积和传输损耗。同时,在外加10 kHz动态信号测试中表现优异,显示出其在高频应变测量中较大的应用潜力。
In this paper,a novel fiber Bragg grating(FBG)sensing system based on thin-film lithium niobate(TFLN)ridge waveguide micro-nano structure is proposed,with the core device integrating an electro-optic Bragg deflection modulator(EOBDM)based on an unbalanced Mach-Zehnder interferometer(MZI).The wavelength demodulation is accomplished by converting the shift of the central wavelength of the FBG into phase modulation using an unbalanced Mach-Zehnder structure and achieving intensity modulation by electro-optic modulation.Using the finite element method,the half-wave voltage of the unbalanced MZI is 29.4 V,the demodulation efficiency is 2.03 V.cm,and the extinction ratio of the device is greater than 54 dB when the center wavelength is 1.55μm.The maximum diffraction efficiency of the EOBDM is 68%,which is much higher than the diffraction intensity required by this system.With the on-chip integrated design,the system effectively reduces the size and transmission loss compared with the traditional demodulation system.At the same time,it performs excellently in the external 1o kHz dynamic signal test,demonstrating its great potential for application in high-frequency strain measurement.
作者
彭福祥
陶传义
郭涛
钱正全
钟祝强
PENG Fuxiang;TAO Chuanyi;GUO Tao;QIAN Zhengquan;ZHONG Zhuqiang(School of Science,Chongqing University of Technology,,Chongqing 400054,China)
出处
《光电子.激光》
北大核心
2025年第11期1121-1128,共8页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(62205040,51874064)
重庆理工大学研究生创新项目(gzlcx20243293)资助项目。
