Simulation study of microring resonator for seawater salinity sensing with weak temperature dependence

Author: Li Guo-Xiang   Wang Jing   Yang Hong-Juan   Su Zhao-Tang   Wang Shan-Shan  

Publisher: Edp Sciences

E-ISSN: 1286-0050|68|2|20502-20502

ISSN: 1286-0042

Source: EPJ Applied Physics (The), Vol.68, Iss.2, 2014-10, pp. : 20502-20502

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Abstract

A seawater salinity sensor based on microring resonator with weak temperature dependence is proposed, which is coated by MgF2 film with positive thermo-optic coefficient. Temperature dependences of the sensor on fiber diameter, probing wavelength and coating thickness are theoretically investigated and ranges of microfiber diameters for weak temperature dependence are obtained. Under the temperature insensitive condition, sensitivity and detection limit of salinity sensing are studied. By optimizing the parameters of the sensing system, salinity sensitivity and detection limit can reach 0.03 nm/‰ and 0.13‰, respectively. The model presented here may be helpful for developing weak temperature dependence sensors for salinity sensing with high sensitivity, low detection limit and miniaturized sizes.