Independent Real and Imaginary Spectral Analysis for Improving the Brillouin Frequency Shift Resolution in the Differential Cross-Spectrum BOTDR (DCS-BOTDR) Fiber Sensor. - Ain Nabihah Mohammad Rihan; Mohd Saiful Dzulkefly Zan; Yosuke Tanaka; Mohd Hadri Hafiz Mokhtar; Norhana Arsad; Ahmad Ashrif A. Bakar (PHOTOPTICS, 2025)