The method of generating equal-amplitude spectral lines by multi-frequency phase modulation is used in stimulated Brillouin scattering (SBS) suppression. The spectra of three, five, seven, and eleven equal-amplitude spectral lines are obtained in experiment with flatnesses less than 0.3 dB. Theoretical research on SBS suppression shows that the threshold power after modulation is in reverse proportion to the maximum square of amplitude moduli of fundamental frequency and the nth harmonic wave. The threshold powers of three, five, seven, and eleven equal-amplitude spectral lines are improved by 5.21, 8.36, 9.39, and 10.76 dB, respectively.
© 2009 Chinese Optics Letters
(060.2330) Fiber optics and optical communications : Fiber optics communications
(140.0140) Lasers and laser optics : Lasers and laser optics
(060.3510) Fiber optics and optical communications : Lasers, fiber
Yingfan Liu, Zhiwei Lv, Yongkang Dong, and Qiang Li, "Research on stimulated Brillouin scattering suppression based on multi-frequency phase modulation," Chin. Opt. Lett. 7, 29-31 (2009)