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

摘要

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.