  The long-term lasing dynamics of Brillouin Fiber Lasers was recently shown to
be governed by an intrinsic thermal feedback which stabilizes the lasing
frequency at the lower half of the gain line. We show that this feedback can be
utilized by means of pump modulation to greatly control this dynamics.
Specifically, we demonstrate experimentally a bi-stable fiber laser where
switching between lasing modes is possible by either controlling the cavity
length or pump power. An inherent hysteretic response ensures the long-term
stability of the laser in each mode. Excellent agreement is found between the
experimental results and a master-equation based theoretical model.
