Abstract

We propose and demonstrate a highly sensitive refractive index (RI) and temperature sensor based on an asymmetric fiber coupler (AFC). The AFC was fabricated by weak fusion of a pre-stretched single-mode fiber and a few-mode fiber. An ultra-sensitivity RI can be achieved near the dispersion turning point (DTP). The proposed RI sensor achieves a high RI sensitivity of ${-}{{10}}{,}{662.4}\;{\rm{nm/RIU}}$ within the RI range of 1.31–1.35. By packaging the AFC into polydimethylsiloxane (PDMS), the temperature sensitivity reaches 11.44 nm/°C. The proposed AFC with high RI and temperature sensitivity can be potentially used in the field of chemical monitoring, biochemical detection, and clinical diagnosis.

© 2022 Optica Publishing Group

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