Recent Advances in Brillouin Optical Time Domain Reflectometry.

Area of Science:

• Optical Fiber Sensing
• Distributed Measurement Technology

Background:

• Brillouin-based sensors have become a key optical fiber sensing technology over the past two decades.
• Brillouin optical time domain reflectometer (BOTDR) is notable for its single-end access, simple architecture, and ease of implementation.

Purpose of the Study:

• To review recent advancements in the performance and applications of BOTDR over the last decade.
• To highlight improvements in spatial resolution, signal-to-noise ratio, measurement accuracy, speed, and cross-sensitivity.
• To explore the Brillouin sensing characteristics of special optical fibers.

Main Methods:

• Review of recent research and development in BOTDR technology.
• Analysis of performance enhancements in key BOTDR parameters.
• Investigation of special optical fibers like plastic optical fiber, photonic crystal fiber, and few-mode fiber for Brillouin sensing.
• Overview of BOTDR applications in industrial fields and intelligent perception.

Main Results:

• Significant progress has been made in improving BOTDR performance metrics.
• Specialty optical fibers offer unique characteristics for enhanced Brillouin sensing.
• BOTDR has demonstrated wide applicability in structural health monitoring and geological disaster prewarning.

Conclusions:

• BOTDR technology has matured significantly, with ongoing research focused on further performance optimization.
• The integration of novel optical fibers promises expanded capabilities for BOTDR systems.
• Future development directions include addressing current challenges and exploring new application frontiers.