基于非切趾短FBG光栅的小信号测量方法  

Weak signal measurement method based on short non apodized FBG

作　　者：李扬[1,2] 刘锋[1,2] 宋言明[1,2] 祝连庆[1,2] LI Yang;LIU Feng;SONGYan-ming;ZHU Lian- qing(Beijing Engineering Research Center of Optoelectronic Information and Instrument,Beijing Information Science ＆ Technology University,Beijing 100016,China;Beijing K ey Laboratory 〇 f Optoelectronic Test Technology,Beijing Information Science and Technology University,Beijing 100016,China)

机构地区：[1]北京信息科技大学光电信息与仪器北京市工程研究中心,北京100016 [2]北京信息科技大学光电测试技术北京市重点实验室,北京100016

出　　处：《激光与红外》2018年第7期885-890,共6页Laser & Infrared

基　　金：教育部长江学者与创新团队发展计划(No.IRT-16R07);北京市科技计划项目(No.Z151100003615010);北京市教委2015年度创新能力提升计划项目(No.TJSHG201510772016)资助

摘　　要：为解决基于图像传感器的FBG解调系统精细测量的问题,提出了使用非切趾FBG测量弱信号的方法。设计出了非切趾FBG反射谱近似模型,采用对数放大的方法提高非切趾FBG的旁瓣,在较宽的光栅频谱范围内,进行光谱相关解调并给出解调算法。基于蒙特卡洛方法对非切趾光栅测量仿真,并搭建实验系统对非切趾FBG、宽带高斯光栅进行对比测量实验。研究结果表明,基于非切趾FBG的弱信号测量方法可有效提高波长测量精度,通过相关解调,可使测量精度达到宽带光栅的2倍。In order to solve the problem of fine measurement of FBG demodulation system in image sensor,a weak signal measurement method based on non apodized FBG is proposed.A non apodized FBG reflection spectrum approximation model was established,and the method of logarithmic amplification was used to improve the sidelobe of non apodized grating,the spectral was demodulated in a wide range of grating spectrum and the demodulation algorithm was given.Based on the Monte Carlo method,the non apodization grating was measured and simulated,and the experimental system was built to compare the measurement of the non apodization grating and the wide spectrum Gauss grating.The results show that the measurement method of weak signal based on non apodized FBG can effectively improve the accuracy of wavelength measurement.By correlation demodulation,the measurement accuracy can reach 2 times of wide spectrum grating.

关 键 词：光纤布拉格光栅 弱信号 非切趾光栅 蒙特卡洛方法 

分 类 号：TN29[电子电信—物理电子学]