Study of the Possibility of Detecting Physical Impacts on a Fiber Sensor Using a Frequency Domain Optical Reflectometer with Reference Channel Multiplexing

Abstract

An approach to modifying the configuration of an optical frequency reflectometer by replacing two special service channels, including an auxiliary interferometer and a gas cell, with a single channel is described. In this configuration, the sensory characteristics of the system were studied. Digital filtering methods were used to extract useful information. It is shown that the presented method allows to avoid the use of an extra channel of the analog-to-digital converter and photodetector, while the reflectogram and correlation functions are restored by the equal-frequency resampling algorithm without loss of information.