Open AccessAbnormally low threshold gain of stimulated Brillouin scattering in long optical fiber with feedback
Author(s) -
V. F. Kovalev,
Robert G. Harrison
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.012272
Subject(s) - brillouin scattering , lasing threshold , optics , amplified spontaneous emission , scattering , optical fiber , physics , spontaneous emission , stimulated emission , slow light , double clad fiber , materials science , dispersion shifted fiber , laser , fiber optic sensor , photonic crystal
We show that in the generation of stimulated Brillouin scattering (SBS) in long (> 1 km) fiber, the threshold for observing coherent Stokes emission occurs at notably lower gain than the classical lasing threshold gain for SBS. The effect is due coherent regenerative amplification of strong spontaneous Brillouin scattering, which occurs in the presence of feedback. The magnitude of the effect scales with the length of interaction.