Extreme Narrowing of the Distributed Feedback Fiber Laser Linewidth Due to the Rayleigh Backscattering in a Single-Mode Fiber: Model and Experimental Test. - Skvortsov, Mikhail I.; Abdullina, Sofia R.; Podivilov, Evgeny V.; Vlasov, Alexander A.; Kharasov, Danil R.; Fomiryakov, Edgard A.; Nikitin, Sergey P.; Treshchikov, Vladimir N.; Babin, Sergey A. (Photonics, 2022)