光子学报, 2015, 44 (4): 0406001, 网络出版: 2015-04-28  

不同结构微光纤双结谐振器光谱特性理论和实验

Theoretical and Experimental Study on Spectral Characteristics of Microfiber Double-knot Resonator with Different Structures
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
基于环形谐振器和方向耦合器理论, 提出了串联结构微光纤双结谐振器和并联结构微光纤双结谐振器的理论模型, 推导了两谐振器中输出光场与输入光场之间的数学解析式, 分析了两谐振器中光场的传输和耦合方向, 及不同直径比的情况下其输出光谱的变化规律.数值模拟表明对于串联结构微光纤双结谐振器, 位于其透射光谱包络下的透射峰数目等于其两环的直径比; 对于并联结构微光纤双结谐振器, 透射光谱中透射峰的数目随直径比的增加而增加, 且每个直径比等间距的透射峰后会出现一个更窄的透射峰.实验制作了具有近似相等直径的串联结构微光纤双结谐振器和具有直径比近似为2的并联结构微光纤双结谐振器.两种结构的透射光谱均与理论模拟相一致, 验证了理论分析的正确性.具有合适直径比的串联结构微光纤双结谐振器和并联结构微光纤双结谐振器在光学滤波器、微型激光器、传感器等方面有重要的应用.
Abstract
Based on the theories of the ring resonators and the directional coupler,the theoretical models of the microfiber double-knot resonator with a serial structure and the microfiber double-knot resonator with a parallel structure were proposed,the mathematic expressions between the output light field and the input one in the two resonators were deduced.The directions of the propagation and coupling in the two resonators were studied, the change rules of the transmission spectra under different diameter ratios of their two rings were analyzed.Numerical simulation indicates that the number of the transmission peaks of the microfiber double-knot resonator with a serial structure under the envelope of its transmission spectrum is equal to the diameter ratio of its two rings,the number of the transmission peaks of the microfiber double-knot resonator with a parallel structure increases with the increasing of the diameter ratio of its two rings and there is a narrower transmission peak per equal spacing peaks of the diameter ratio.The microfiber double-knot resonator with a serial structure for approximately equivalent diameters and the microfiber double-knot resonator with a parallel structure for a diameter ratio of approximate 2 were fabricated.The experimental transmission spectra show good agreements with the theoretical ones for each structure,indicating that the theoretical analysis is considerably correct.The microfiber double-knot resonator with a serial structure and that with a parallel structure for proper diameter ratios have significant applications in optical filters,miniature lasers,sensors,and so on.

徐益平, 任立勇, 马成举, 王英利, 孔旭东, 梁健, 巨海娟. 不同结构微光纤双结谐振器光谱特性理论和实验[J]. 光子学报, 2015, 44(4): 0406001. XU Yi-ping, REN Li-yong, MA Cheng-ju, WANG Ying-li, KONG Xu-dong, LIANG Jian, JU Hai-juan. Theoretical and Experimental Study on Spectral Characteristics of Microfiber Double-knot Resonator with Different Structures[J]. ACTA PHOTONICA SINICA, 2015, 44(4): 0406001.

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