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Updated: May 10, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
Ultrahigh sensing based on feedback double ring configuration beyond the limitation of quality factor on sensitivity
Ying Wang1, Yundong Zhang, Yulong Gai
1National Key Laboratory of Tunable Laser Technology, Institute of Opto-Electronics, Harbin Institute of Technology, Harbin, China.
Abstract:
In this article, we present a simple method to realize a sensor of ultrahigh sensitivity and compact size by employing a feedback double ring resonator. We demonstrate that this method has not only a higher sensitivity than an optimal add-drop resonator (ADR), but also a relatively high performance when the Q factor drops. Furthermore, we show that this sensing system can overcome the limitation of Q factor on system sensitivity by 2 orders of magnitude in comparison to the corresponding ADR. Thus, the proposal in this paper provides a promising and feasible scheme to realize a highly effective sensor that is weakly dependent on the Q factor of the system.
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