Ania-Castanon, J. D.Martin-Lopez, S.Alcon-Camas, M.Rodriguez-Barrios, F.Carrasco-Sanz, A.Corredera, P.Thévenaz, LucGonzalez-Herraez, M.2011-06-222011-06-222011-06-22201110.1109/PHOTWTM.2011.5730100https://infoscience.epfl.ch/handle/20.500.14299/68936We 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.text::conference output::conference proceedings::conference paper