We report the dependence of Brillouin linewidths on the pump power below the threshold of Brillouin lasing in a silica fiber. The Stokes Brillouin shift in a silica fiber is nearly unchanged, and its linewidth decreases with increasing pump power. However, the anti-Stokes Brillouin shift becomes smaller and its linewidth larger with increasing pump power. We explain these experimental results by the distributed fluctuating source model.
© 2007 Optical Society of America
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(290.5900) Scattering : Scattering, stimulated Brillouin
Fiber Optics and Optical Communications
Original Manuscript: August 1, 2007
Revised Manuscript: September 26, 2007
Manuscript Accepted: October 1, 2007
Published: October 24, 2007
Guanshi Qin, Takenobu Suzuki, and Yasutake Ohishi, "Power dependence of Brillouin linewidths in a silica fiber," Opt. Lett. 32, 3155-3157 (2007)