Abstract
In this report, we investigate the single-fiber (SF) Mach-Zehnder interferometer (MZI) based refractive index (RI) sensor, fabricated in house for the RI range from 1.3344 RIU to 1.4532 RIU. The RI sensitivity of fabricated sensor was enhanced, from 20.2 nm/RIU to 25.9 nm/RIU, by incorporating it in fiber loop mirror (FLM) configuration. The enhanced sensitivity may be attributed to the non-reciprocal phase shift present in bend or twist of the fiber loop forming the FLM configuration. A simple method for quantifying the non-reciprocal phase shift in FLM configuration has been proposed.
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