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arXiv 2604.06960physics.optics
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光纤交汇处诱导的微谐振器

Widely tunable SNAP microresonators induced at the optical fiber intersections

Aston Institute of Photonic Technologies, Aston University(阿斯顿光子技术研究所,阿斯顿大学)

M. Sumetsky

AI总结:

本文研究了通过光纤弯曲、倾斜和扭转调节微谐振器自由光谱范围的方法,提出了一种基于弱扭曲光纤的理论模型,揭示了光纤曲率对谐振器形状和光谱的影响。

摘要:

广泛可调的自由光谱范围(FSR)对许多光学微谐振器应用至关重要,但实现这一目标仍是一个重大挑战。最近实验表明,两根光纤间的侧耦合可诱导出高Q值的声学谐振器(WGM)微谐振器。与广泛研究的单片光学微谐振器不同,这种配置通过光纤弯曲、倾斜和扭转实现了对微谐振器FSR的广泛调节。除了基础研究外,此类微谐振器在可调延迟线、频率梳生成器和可重构光学传感器等关键应用中尤为重要。本文发展了此类微谐振器的理论,此前研究较少。我们考虑了弱扭曲光纤,其几何形状可分解为倾斜和弯曲。我们展示了光纤极小曲率对诱导微谐振器形状和光谱有关键影响。我们讨论了这种曲率的物理起源,并表明考虑其影响可使所发展的理论与实验结果高度一致。

英文摘要:

A widely tunable free spectral range (FSR) is essential for many microresonator applications, but achieving it in compact high-Q systems remains a significant challenge. Surface nanoscale axial photonics (SNAP) provides a route to such devices by localizing whispering-gallery modes through nanoscale effective-radius variations along an optical fiber. Recently, it has been experimentally demonstrated that side-coupling between two optical fibers can induce high-Q SNAP microresonators. In contrast to broadly explored monolithic microresonators, this configuration enables extensive mechanical tuning of the microresonator configuration and FSR through fiber bending, tilting, and twisting. Here, we develop the theory of SNAP microresonators induced at optical fiber intersections, which has remained largely unexplored. We consider weakly twisted fibers, whose geometry can be decomposed into tilting and bending. We show that extremely small fiber curvature critically affects the coupling-induced cutoff frequency variation, the shape of the effective axial potential, and the spectrum of the induced resonator. We discuss the physical origin of this curvature and show that accounting for it resolves the discrepancy between theory and experiment. These findings establish side-coupled optical fibers as a simple, reconfigurable platform for realizing microresonators with a widely tunable FSR.

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