Time-dependent Modeling of Brillouin Scattering in Passive Optical Fibers Pumped by a Chirped Diode Laser

Report No. ARL-TR-6113
Authors: Jeffrey O. White, Steven D. Rogers, and Carl E. Mungan
Date/Pages: August 2012; 18 pages
Abstract: The coupled partial differential equations describing stimulated Brillouin scattering (SBS) in a fiber are solved numerically. The SBS builds up from random thermal phonons when a laser beam of sufficient power is incident upon the fiber. We show that the SBS can be suppressed by linearly ramping the laser frequency at a rate of up to 1016 Hz/s. High chirp rates lead to an increased Brillouin spectral bandwidth and decreased gain. The resulting SBS suppression agrees well with an adiabatic model and with experimental results.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2012