标题： 广泛可调的高Q因子微谐振器在直光纤交叉处形成 显示英文标题

标题： Widely FSR tunable high Q-factor microresonators formed at the intersection of straight optical fibers

摘要： 我们提出了一种新型的高-Q可调微谐振器，该谐振器形成于两条直硅光纤的交叉处，其自由光谱范围（FSR）可通过光纤旋转进行广泛调节。所提出的结构避免了传统单片微谐振器在FSR可调性方面的限制，而这种可调性对于广泛的光子应用是必需的。使用小角度旋转（1-15 mrad），我们展示了FSR从2 pm到10 pm的可调性，这是通过微米尺度的光纤位移实现的，这些位移在毫米尺度上重塑了谐振器的轮廓。所提出的方法最小化了机械应力，支持微型化，并适合与MEMS集成。它为在芯片上制造可调延迟线、超低重复率宽带频率梳发生器和非局部光流体传感器铺平了道路。 显示英文摘要

摘要： We present a new class of high-Q tunable microresonators formed at the intersection of two straight silica optical fibers, whose free spectral range (FSR) can be widely tuned by fiber rotation. The proposed configuration avoids the limitations of traditional monolithic microresonators that lack FSR tunability required for a wide range of photonic applications. Using small rotation angles (1-15 mrad), we demonstrate a tunability of the FSR from 2 pm to 10 pm, enabled by microscale fiber displacements that reshape the resonator profile over millimeter scales. The proposed approach minimizes mechanical stress, supports miniaturization, and is suitable for integration with MEMS. It paves the way for the fabrication of tunable delay lines, ultralow repetition rate broadband frequency comb generators, and nonlocal optofluidic sensors on a chip.