Open AccessSuppression of stimulated Brillouin scattering in high power fibers using nonlinear phase demodulation
Author(s) -
Gregory D. Goodno,
Joshua E. Rothenberg
Publication year - 2019
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.27.013129
Subject(s) - brillouin scattering , optics , phase modulation , self phase modulation , materials science , laser linewidth , modulation (music) , amplitude modulation , cross phase modulation , optical fiber , amplifier , phase (matter) , demodulation , phase conjugation , nonlinear optics , frequency modulation , physics , optoelectronics , phase noise , bandwidth (computing) , telecommunications , laser , channel (broadcasting) , cmos , quantum mechanics , computer science , acoustics
We demonstrate a modulation approach that relaxes the limitations imposed by stimulated Brillouin scattering (SBS) on amplification and propagation of narrow-linewidth light in fibers. By imposing synchronous amplitude and phase modulation on an input field, the optical spectrum after high-power fiber transmission is compressed using nonlinear self-phase modulation. This effectively reduces the SBS interaction length and increases the SBS threshold, enabling narrower linewidths. Using this technique, we demonstrate >2 × increase in SBS-limited spectral brightness from a kW-class amplifier. We show that SBS suppression becomes more effective for higher powers and longer fibers.