偏振无关磁光波导的设计  

Design of polarization-independent magneto-optical waveguides

作　　者：陶栋杰[1] 周海峰[1] 郝寅雷[1] 杨建义[1] 王明华[1] 江晓清[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2009年第4期658-661,共4页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(60777015);国家"973"重点基础研究发展计划资助项目(2007CB613405)

摘　　要：为使隔离器、环行器及其他非互易器件广泛地应用于波导集成光子回路,基于磁光材料的非互易特性,提出了一种偏振无关的磁光波导的简单设计方法.在磁光波导芯区的侧面引入特定高折射率区,造成了场强分布的不对称性,从而达到了非互易波导偏振无关的目的.微扰法和有限差分法相结合的分析表明,当方形单模波导宽度大于0.7μm时,TE和TM模非互易相移的相对误差低于1%.该波导结构具有制作简单、工艺容易实现的优点,适用于偏振无关的非互易磁光波导器件.A simple design approach was presented to avoid the polarization dependence of magneto-optical （MO） waveguide by analyzing the nonreciprocal phase shift in order to widely spread the application of optical isolators, circulators and other nonreciprocal devices into the integrated photonic circuit. A higher refractive index region at one side of the MO core waveguide was involved laterally to break the symmetry of the field distribution. Then the polarization independence of nonreciprocal waveguide was realized. The analysis combined perturbation method and finite difference method shows that the relative derivation between TE and TM mode is lower than 1% while the width of the square single-mode waveguide is larger than 0.7 /~m. The advantages in size, fabrication tolerance and design flexibility of the structure may facilitate the nonreciprocal optical device.

关 键 词：非互易特性 偏振无关 磁光波导 集成光学 

分 类 号：TN256[电子电信—物理电子学]