一种单偏振低噪声谐振式空芯光子晶体光纤陀螺  

A hollow-core photonic-crystal fiber optic gyroscope based on single-polarization and low-noise resonator

作　　者：申河良 毕然[1] 傅力 佘玄[1] 陈侃[1] 舒晓武[1] SHEN Heliang;BI Ran;FU Li;SHE Xuan;CHEN Kan;SHU Xiaowu(College of Optical Science and Engineering,Zhejiang University,Hangzhou 310027,China;Accelink Technology Co.Ltd,Wuhan 430205,China)

机构地区：[1]浙江大学光电科学与工程学院,杭州310027 [2]光迅科技股份有限公司,武汉430205

出　　处：《中国惯性技术学报》2021年第5期643-649,共7页Journal of Chinese Inertial Technology

基　　金：浙江省自然科学基金资助(Q18F050002)。

摘　　要：针对小型化惯性测量单元的需求,提出了一种将空芯光子晶体光纤环与退火质子交换铌酸锂波导耦合器对准耦合的谐振腔设计方案,凭借退火质子交换铌酸锂波导的强起偏能力和空芯光子晶体光纤的优良特性,该谐振腔具有单偏振、低噪声、小体积等优势。针对传统铌酸锂波导与光纤对准耦合损耗较大的问题,提出使用离子注入和键合技术在波导上表面覆盖一层铌酸锂材料,从而改善波导的模场分布,减小耦合损耗。利用时域有限差分数值分析方法建立波导和光纤的模型,对耦合效率进行了仿真分析,探讨了波导结构、工艺参数的影响,经过优化设计,可以将空芯光子晶体光纤与铌酸锂波导的耦合损耗减小至0.39 dB。为谐振式空芯光子晶体光纤陀螺的发展提供了一种思路。To meet the demand of miniaturized inertial measurement unit(IMU),a scheme of hollow-core photonic-crystal fiber(HCPCF)ring resonator is proposed,which utilizes an annealed proton exchange LiNbO_(3)(APE-LN)waveguide coupler.The resonator has the advantages of single polarization,low noise and small size thanks to the large polarization extinction of the APE-LN waveguide and the excellent characteristics of the HCPCF.In order to reduce the coupling loss between the conventional APE-LN waveguide and fiber,Ion injection and bonding techniques to cover the upper surface of the conventional APE-LN waveguide with a cladding of LiNbO_(3) is proposed,which can improve the mode field distribution of the conventional APE-LN waveguide.The APE-LN waveguide and HCPCF are modelled and analyzed by the numerical analysis method of finite-difference time-domain,and the effects of the waveguide structure and process parameters are explored.By optimizing design,the coupling loss between the HCPCF and the APE-LN waveguide can be reduced to 0.39 dB,which provides a novel scheme for the development of resonator fiber optic gyroscope based on HCPCF resonator.

关 键 词：谐振式光纤陀螺 光纤谐振腔 铌酸锂波导 空芯光子晶体光纤 

分 类 号：U666.1[交通运输工程—船舶及航道工程]