TY - JOUR
T1 - Widely FSR tunable high Q-factor microresonators formed at the intersection of straight optical fibers
AU - Sumetsky, Misha
AU - Sharma, Isha
N1 - Copyright ©2025 Optica Publishing Group. Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
PY - 2025/6/20
Y1 - 2025/6/20
N2 - We present a 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.
AB - We present a 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.
UR - https://opg.optica.org/optica/fulltext.cfm?uri=optica-12-6-890&id=572984
U2 - 10.1364/OPTICA.565224
DO - 10.1364/OPTICA.565224
M3 - Article
SN - 2334-2536
VL - 12
SP - 890
EP - 893
JO - Optica
JF - Optica
IS - 6
ER -