Microfiber sagnac interferometer for sensing applications

• Main Authors: Kuczkowski, Michal, Ying, Cui, Quyen Dinh, Xuan, Shum, Perry Ping, Rutkowska, Katarzyna A., Wolinski, Tomasz R.
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
• Online Access: https://hdl.handle.net/10356/105540; http://hdl.handle.net/10220/17705; http://dx.doi.org/10.4302/plp.2012.4.05
• Institution: Nanyang Technological University

In this paper we propose an optical fiber-based refractive index and temperature sensor using an MNF (micro/nano fiber) inserted in a Sagnac loop interferometer [1]. A portion of the PMF is tapered into a micro/nano dimension to increase the interactions between a guided signal and the surrounding environment. Experimental tests have demonstrated low response to temperature and high sensitivity to refractive index change of a liquid surrounding the MNF. It has been shown that the sensitivity of the setup under test to temperature decreases when a longer MNF is used. The maximum sensitivity for a refractive index achieved equals to 1068nm/RIU, which was obtained by a 4.7-mm long MNF with a diameter of 30um.