The characteristics of a microring resonator in optical waveguide displacement sensors

被引：1

作者：

Ji, Z. ^{[1
]}

Yan, Y. Y. ^{[1
]}

Wang, B. H. ^{[1
]}

Jiang, G. Q. ^{[1
]}

Yan, S. B. ^{[1
]}

Zhang, W. D. ^{[1
]}

机构：

[1] North Univ China, Instrument Sci & Dynam Measurement, Natl Key Lab Elect Measurement, Taiyuan, Shanxi, Peoples R China

来源：

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART N-JOURNAL OF NANOMATERIALS NANOENGINEERING AND NANOSYSTEMS | 2008年 / 222卷 / 03期

关键词：

microring resonator; free spectrum range (FSR); optimum resonance condition; quality factor;

D O I：

10.1243/17403499JNN152

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Pumping a single-mode, tunable, external-cavity laser to excite the whispering gallery modes (WGM) of microring resonators (MRRs) allows the observation of a series of equidistant, wide free spectrum ranges (FSR). A frequency shift of an FSR can be used to feedback external changes, making MRRs very promising for high-sensitivity sensing. Furthermore, sensor performance is intimately related to the resonance condition and resonator quality factor, Q. In this paper, a novel displacement sensor composed of a microring resonator and a waveguide is presented. Materials selection is discussed. The two most important influencing factors, the optimized resonance condition and Q, are demonstrated especially. Based on mathematical analysis and finite-difference time-domain simulation, the optimized resonance is obtained when the radius and coupling distance are around 20 mm and 0.2 mm, respectively, with the FSR of the transmission spectrum about 13.6 nm. Correspondingly, the ultimate Q is approximately 10 2 in the preliminary experiment.

引用

页码：117 / 123

页数：7

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