Open AccessCharacteristics of the Brillouin spectra in Erbium-Ytterbium fibers
Author(s) -
Guillaume Canat,
Anne Durécu,
Guillaume Lesueur,
Laurent Lombard,
P. Bourdon,
Véronique Jolivet,
Yves Jaouën
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.16.003212
Subject(s) - ytterbium , erbium , brillouin scattering , brillouin zone , materials science , spectral line , optics , fiber laser , optical fiber , doping , optoelectronics , physics , astronomy
This paper reports the main characteristics of the Stokes spectra for typical pumped and unpumped Erbium-Ytterbium doped fibers. Doped fibers show shorter Brillouin shifts and their spectra are up to 1.6 times broader than undoped fibers. Those spectra are composed of several peaks originating from several longitudinal acoustic modes. The effective Brillouin gain of the secondary modes can be as large as 20% of the main peak gain. They can merge into a more complex structure for the largest cores. Simulations allow to relate these characteristics to the influence of codoping and index profile inhomogeneity. An additional broadening of the Stokes spectrum in pumped fibers is reported and attributed to thermal effects.