Radio-frequency spectrum coding in ultra-long fibre laser based cryptography. - Katarzyna Krupa; Alessandro Tonello; Sonia K. Boscolo; Alain Barthélémy; Vincent Kermene; Agnés Desfarges-Berthelemot; B. M. Shalaby; Sergei K. Turitsyn; Juan Diego Ania-Castañón (ICTON, 2015)