We review some recent results on the application of distributed Raman amplification schemes, including ultralong lasers, to the extension of the operating range and contrast in Brillouin optical time domain analysis (BOTDA) distributed sensing systems.
Kirsten Emilie Moselund, Chang Won Lee
Haoye Qin, Gang Wang, Bo Fu, Xuchen Wang, Hao Ouyang
Tobias Kippenberg, Junqiu Liu, Maxim Karpov, Anton Lukashchuk