  We investigate slow-light via stimulated Brillouin scattering in a room
temperature optical fiber that is pumped by a spectrally broadened laser.
Broadening the spectrum of the pump field increases the linewidth
$\Delta\omega_p$ of the Stokes amplifying resonance, thereby increasing the
slow-light bandwidth. One physical bandwidth limitation occurs when the
linewidth becomes several times larger than the Brillouin frequency shift
$\Omega_B$ so that the anti-Stokes absorbing resonance cancels out
substantially the Stokes amplifying resonance and hence the slow-light effect.
We find that partial overlap of the Stokes and anti-Stokes resonances can
actually lead to an enhancement of the slow-light delay - bandwidth product
when $\Delta\omega_p \simeq 1.3 \Omega_B$. Using this general approach, we
increase the Brillouin slow-light bandwidth to over 12 GHz from its nominal
linewidth of $\sim$30 MHz obtained for monochromatic pumping. We controllably
delay 75-ps-long pulses by up to 47 ps and study the data pattern dependence of
the broadband SBS slow-light system.
