Refractive index sensing with temperature compensation by a multimode-interference fiber-based optical frequency comb sensing cavity

Ryo Oe; Takeo Minamikawa; Shuji Taue; Hidenori Koresawa; Takahiko Mizuno; Masatomo Yamagiwa; Yasuhiro Mizutani; Hirotsugu Yamamoto; Tetsuo Iwata; Takeshi Yasui

doi:10.1364/OE.27.021463

Refractive index sensing with temperature compensation by a multimode-interference fiber-based optical frequency comb sensing cavity

Opt Express. 2019 Jul 22;27(15):21463-21476. doi: 10.1364/OE.27.021463.

Authors

Ryo Oe, Takeo Minamikawa, Shuji Taue, Hidenori Koresawa, Takahiko Mizuno, Masatomo Yamagiwa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Tetsuo Iwata, Takeshi Yasui

PMID: 31510224
DOI: 10.1364/OE.27.021463

Abstract

We proposed a refractive index (RI) sensing method with temperature compensation by using an optical frequency comb (OFC) sensing cavity including a multimode-interference (MMI) fiber, namely, the MMI-OFC sensing cavity. The MMI-OFC sensing cavity enables simultaneous measurement of material-dependent RI and sample temperature by decoding from the comb spacing frequency shift and the wavelength shift of the OFC. We realized the simultaneous and continuous measurement of RI-related concentration of a liquid sample and its temperature with precisions of 1.6 × 10^-4 RIU and 0.08 °C. The proposed method would be a useful means for the various applications based on RI sensing.