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Updated: Jun 17, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
Adiabatic dynamic turning points for time-domain feature-based fiber interferometric sensing
Abstract:
Dynamic wavelength modulation of semiconductor lasers is widely used for rapid spectral scanning, yet its intrinsic temporal dynamics are rarely exploited as a basis for sensing feature construction. Here, we propose the adiabatic dynamic turning point (ADTP), a time-domain physical criterion that emerges during dynamically chirped laser excitation. Unlike conventional dispersion turning points governed by structural dispersion, ADTP originates from a stationary condition in the wavelength tuning trajectory and appears as a distinct temporal feature in optical responses. Through theoretical analysis, simulations, and experiments with fiber interferometric sensors, we show that the ADTP region provides identifiable temporal signatures enabling direct tracking of sensing information derived from periodic interferometric responses, without explicit spectral reconstruction. Temperature sensing experiments confirm bidirectional temporal shifts and sensitivity enhancement near the ADTP. Time-division multiplexed multipoint sensing is further demonstrated, highlighting the potential of ADTP as a source-defined feature mechanism for time-domain optical sensing.
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