Optical Sensor Based on Vernier-Cascade of Ring Resonator and Echelle Diffraction Grating

Author

Qin, Li ; Wang, Lei ; Li, Mingyu ; He, Jian-Jun

Author_Institution

Key Lab. of Modern Opt. Instrum., Zhejiang Univ., Hangzhou, China

Volume

24

Issue

11

fYear

2012

fDate

6/1/2012 12:00:00 AM

Firstpage

954

Lastpage

956

Abstract

An optical sensor based on the Vernier-cascade of a ring resonator and an echelle diffraction grating (EDG) demultiplexer is proposed and analyzed. Due to the difference between the free spectral range of the ring and the channel spacing of the EDG demultiplexer, the refractive index change of the analyte fluid on the ring can be detected by the power distribution among the channels of the EDG. By combining a coarse measurement and a fine measurement, a refractive index sensitivity in the order of 10^-6 RIU can be achieved. An optical sensor system can be realized by using a low-cost broadband light source and a detector array.

Keywords

diffraction gratings; integrated optics; optical resonators; optical sensors; refractive index; EDG demultiplexer; Vernier-cascade; analyte fluid; channel spacing; coarse measurement; detector array; echelle diffraction grating demultiplexer; fine measurement; free spectral range; low-cost broadband light source; optical sensor; power distribution; refractive index change; refractive index sensitivity; ring resonator; Arrayed waveguide gratings; Diffraction; Optical ring resonators; Optical sensors; Refractive index; Sensitivity; Echelle diffraction grating (EDG); integrated optics; optical sensor; ring resonator;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2190398

Filename

6166854