Ultra-high-resolution and ultra-large-dynamic-range fiber temperature sensor based on continuous resonance peaks tracking technique

•We demonstrate a fiber ring sensor with exceptional monitoring capabilities over a wide temperature range from 18 °C to 180 °C, and simultaneously achieving an impressive temperature resolution of 2.52 μ°C.•We propose a fiber ring temperature sensor with a quality factor (Q) of approximately 6.78×107.•By combining time-division multiplexing and continuous resonance peaks tracking technique, we can realize a dynamic range of 252 °C (180 dB) with ultra-high resolution through splicing of up to 12,000 resonance peaks. The ultra-high sensing resolution and large dynamic range in the field of fiber sensors are inherently contradictory. In this study, we present a fiber ring sensor based on the Pound-Drever-Hall technique, achieving a remarkable temperature resolution of 2.52 μ°C. By leveraging approximately 762 resonance peaks, combined with continuous resonance peak tracking and time-division multiplexing techniques, our sensor demonstrates exceptional monitoring capabilities over a wide temperature range from 18 °C to 180 °C, with a dynamic range exceeding 156 dB. Extrapolating from these results, incorporating over 12,000 resonance peaks could potentially extend the measurement range beyond 180 dB and enable temperature monitoring up to approximately 252 °C. This groundbreaking sensor offers ultra-high resolution and an ultra-large dynamic range, showcasing significant potential for advanced temperature monitoring applications.