Optical Chirp Chain BOTDA with 150 km sensing range based on Brillouin loss scheme

Long range distributed optical fiber sensing is urgently needed in many areas, such as pipeline safety, road and bridge monitoring, and so on. Optical chirp chain Brillouin optical time-domain analysis is considered successfully scheme of fast distributed optical fiber sensing, and here, we proposed a fast-monitoring sensing scheme with ultra-long sensing range, which is based on optical chirp chain and Brillouin loss spectrum, and a final parameter of 3.2-s measurement time, 6-m spatial resolution and 150-km sensing range have been achieved over a single-mode fiber.