Temperature estimation and noise reduction of optical fiber based on Extended Kalman filtering algorithm

Abstract This paper investigates temperature-dependent optical fiber signals in a Mach-Zehnder interferometer (MZI) by establishing a thermo-optic measurement model and analyzing the temporal relationship between fiber temperature and photoelectric voltage under thermal excitation. We employ the Extended Kalman Filter (EKF) to approximate the nonlinear state and measurement equations, achieving precise tracking of photoelectric signals and accurate fiber temperature estimation. This work provide