并联结构微光纤双结谐振器中的慢光效应

徐益平; 任立勇; 王英利; 孔旭东; 梁健; 巨海娟; 乔敦

doi:doi:10.3788/gzxb20154405.0506002

光子学报, 2015, 44 (5): 0506002, 网络出版: 2015-05-26

并联结构微光纤双结谐振器中的慢光效应

Slow-light Effect in Microfiber Double-knot Resonator with a Parallel Structure

论文大纲

徐益平 ^1,2,*任立勇 ¹王英利 ¹孔旭东 ^1,2梁健 ¹巨海娟 ¹乔敦 ¹

作者单位

¹ 中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室, 西安 710119

² 中国科学院大学, 北京 100049

摘要

为了研究基于微光纤的谐振器中的慢光效应, 设计并制作了并联结构的微光纤双结谐振器.基于环形谐振器和方向耦合器理论, 提出并联结构微光纤双结谐振器的理论模型, 分析了该谐振器中光场传输和耦合的方向, 推导了该谐振器中输出光场与输入光场之间的数学解析式和群延时表达式.通过数值模拟, 给出了有关该谐振器的透射光谱和群延时, 分析了群延时与透射光谱中谐振波长的对应关系.数值结果表明在该谐振器中, 大的群延时能够在具有大消光比的谐振波长处产生.实验制作了一个并联结构的微光纤双结谐振器, 测得的透射光谱与理论模拟相一致, 验证了该谐振器理论分析的正确性.利用示波器上脉冲延时的方法, 搭建了慢光延时测量系统, 测得该谐振器中大约75 ps的群延时, 远大于现有文献中的值.该谐振器可用于微纳光学的数据延时线、光学开关和光学存储等.

Abstract

In order to study the slow-light effect in the microfiber based resonator,a microfiber double-knot resonator with a parallel structure was designed and fabricated.Based on the theories of the ring resonator and the direction coupler,the theoretical model of the microfiber double-knot resonator with a parallel structure was proposed,the direction of the light-field propagation and coupling in the resonator was analyzed,the mathematic expression between the output light and the input one in the resonator was deduced,and the expression of the group delay time was also obtained.By numerical simulating method,the spectra of the transmission and the group delay time were given,the corresponding relationship between group delays and resonant wavelengths of the transmission spectrum in the resonator was analyzed.The numerical result indicates that a large group delay can be obtained at the resonant wavelength with a large extinction ratio in the resonator.In experimental,a microfiber double-knot resonator with a parallel structure was fabricated,the transmission spectrum of the fabricated resonator was well consistent with the theoretical simulation, indicating that the theoretical analysis is correct.Employing the pulse-delay method in the Oscilloscope,a measuring system of the slow-light delay in the resonator was set up.A group delay of about 75 ps in the fabricated resonator is achieved,which is larger than the reported value.The resonator could be beneficial to applicating in data delay lines,optical switches and optical memories,etc.

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徐益平, 任立勇, 王英利, 孔旭东, 梁健, 巨海娟, 乔敦. 并联结构微光纤双结谐振器中的慢光效应[J]. 光子学报, 2015, 44(5): 0506002. XU Yi-ping, REN Li-yong, WANG Ying-li, KONG Xu-dong, LIANG Jian, JU Hai-juan, QIAO Dun. Slow-light Effect in Microfiber Double-knot Resonator with a Parallel Structure[J]. ACTA PHOTONICA SINICA, 2015, 44(5): 0506002.

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