Open AccessSpectral variations of the output spectrum in a random distributed feedback Raman fiber laser
Author(s) -
A. R. Sarmani,
M. H. Abu Bakar,
Ahmad Ashrif A Bakar,
Faisal Rafiq Mahamd Adikan,
Mohd Adzir Mahdi
Publication year - 2011
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.19.014152
Subject(s) - optics , fiber bragg grating , materials science , lasing threshold , fiber laser , rayleigh scattering , wavelength , raman spectroscopy , spectral width , raman scattering , laser , dispersion shifted fiber , polarization maintaining optical fiber , optical fiber , fiber , fiber optic sensor , physics , composite material
We report an ultra-long Raman laser that implemented a variable pumping scheme in backward and forward configurations. Rayleigh backscattering effects were realized in the 51 km fiber length that functioned as a virtual mirror at one fiber end. With the employment of a fiber Bragg grating that has a peak reflection wavelength at 1553.3 nm, spectral broadening effects were observed. These occurred as the pump power level was diverted more to the forward direction. Owing to this fact, a maximum width of 0.9 nm was measured at 100% forward pumping. The obtained results show that the efficient exploitation of four-wave mixing interactions as well as strong Rayleigh backscattering are beneficial to influence the lasing performances. Both of these nonlinear responses can be adjusted by varying pumping distributions along the fiber longitudinal dimension.