Liu Ke, He Yang, Yang Ao, Shi Lei, Huang Lianglin, Zhou Pu, Pang Fufei, Wang Tingyun, Zeng Xianglong
Opt Lett. 2019 Feb 15;44(4):879-882. doi: 10.1364/OL.44.000879.
We experimentally investigate the resonant response in a microsphere coupled with a biconical microfiber coupler (MFC) composed of single- and/or few-mode fibers. The evolution between Lorentz and Fano resonances dependent on the phase difference of the supermodes is demonstrated along the coupling region of the MFC. A flexible narrow-linewidth add-drop filter can be simultaneously achieved with the advantage of easy alignment and efficiently evanescent coupling. In addition, the mode conversion process of the microsphere is demonstrated, and the purity of the LP mode in a coupler at the whispering gallery mode resonance is analyzed. The proposed MFC coupling system holds great promising applications in optical filtering and sensing, mode switching, and micro-resonator-based combs.
我们通过实验研究了与由单模和/或少模光纤组成的双锥微光纤耦合器（MFC）耦合的微球中的共振响应。沿着MFC的耦合区域展示了依赖于超模相位差的洛伦兹共振和法诺共振之间的演变。利用易于对准和高效倏逝耦合的优势，可以同时实现一种灵活的窄线宽分插滤波器。此外，还展示了微球的模式转换过程，并分析了在回音壁模式共振时耦合器中LP模式的纯度。所提出的MFC耦合系统在光学滤波与传感、模式切换以及基于微谐振器的梳状滤波器方面具有广阔的应用前景。
