Hybrid-Mode Distributed Fiber Sensing with Multiple Parameters Monitoring Ability

This article discusses the integration of Brillouin optical time-domain analysis (BOTDA) and Phase-sensitive Optical Time Domain Reflectometry ($\Phi-\text{OTDR}$) for distributed optical fiber sensing systems. Combining these two systems and sharing typical instrumentation can reduce the system cost. On the same 18.7 km optical fiber, temperature, strain, and vibration are detected.

I. Introduction

BOTDA is one of the primary sensing techniques based on Brillouin scattering in distributed fiber sensing systems [1], offering advantages of long-distance and high-precision sensing [2]. In recent years, researchers have continuously invested in new technologies to enhance the sensing performance of BOTDA systems.