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作者机构:Department of Electrical & Systems Engineering Washington University in St. Louis St. LouisMO63130 United States Department of Physics Washington University in St. Louis St. LouisMO63130 United States Department of Pathology & Immunology Washington University School of Medicine St. LouisMO63110 United States State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing100084 China Tsinghua National Laboratory for Information Science and Technology Beijing100084 China Collaborative Innovation Center of Quantum Matter Beijing100084 China
出 版 物:《arXiv》 (arXiv)
年 卷 期:2019年
核心收录:
主 题:Degrees of freedom (mechanics)
摘 要:Microbubble whispering-gallery resonators have shown great promise in fiber-optic communications because of their low confinement loss and hollow cores, which allow for facile stress-based tunability. Usually, the transmission spectrum of taper-coupled microbubbles contains closely spaced modes due to the relatively large radii and oblate geometry of microbubbles. In this letter, we develop an optical add-drop filter using a microbubble coupled to fiber taper and angle-polished fiber waveguides. Because of the extra degree of freedom in the angle of its polish surface, the angle-polished fiber can be used for the discriminatory excitation of certain radial-order modes in the optical microcavity, reducing the high modal density and enhancing add-drop selectivity. Our robust and tunable add-drop filter demonstrated a drop efficiency of 85.9% and quality factor of 2 x 107, corresponding to a linewidth of 9.68 MHz. As a proof of concept, the drop frequency was tuned using internal aerostatic pressure at a rate of 7.3 ± 0.2 GHz/bar with no diminishing effects on the add-drop filter performance. Copyright © 2019, The Authors. All rights reserved.