Brillouin Optical Correlation Domain Analysis With Over 2.5 Million Resolution Points Based on Raman Amplification and Injection Locking

We propose and experimentally demonstrate a long-range Brillouin optical correlation domain analysis (BOCDA) system based on distributed Raman amplification and injection-locking to reach over 2.6 million resolving points. The optimization of key parameters in the Raman amplification, time domain data processing, differential measurement scheme, and injection-locking are applied to achieve a spatial resolution of 2 cm over a 50 km sensing fiber. Our result corresponds to at least twice improvement compared to former records, and the best one among distributed Brillouin sensors in terms of the number of resolving points.

Automated summary

We propose and experimentally demonstrate a long-range Brillouin optical correlation domain analysis (BOCDA) system based on distributed Raman amplification and injection-locking, achieving over 2.6 million resolving points. By optimizing key parameters in the Raman amplification, time domain data processing, differential measurement scheme, and injection-locking, a spatial resolution of 2 cm over a 50 km sensing fiber is achieved. Our result shows at least twice improvement compared to previous records and achieves the highest number of resolving points among distributed Brillouin sensors.