Abstract
In this paper, Brillouin gain performances of tellurite fiber are investigated
for photonics applications. We demonstrate stimulated Brillouin amplification
and lasing and the simulated performance of slow light generation in a single-mode
tellurite fiber. A Brillouin gain of 29 dB is achieved in a 100-m tellurite
fiber with a pump power of 10 mW at 1550 nm. A peak value of Brillouin gain
coefficients of 1.6989 x 10<sup>-10</sup> m/W
is measured on the base of gain characteristics. An all-fiber Brillouin laser
with the maximum unsaturated power of 54.6 mW at 1550
nm and a slope efficiency of 38.2% is achieved from a
200-m tellurite fiber by employing a ring cavity. Furthermore, widely tunable
(~27 nm) Brillouin
comb laser with 26 lines spaced at 7.97 GHz is obtained from the ring laser
cavity including an erbium-doped fiber amplifier (EDFA). A simple theoretical
model based on laser threshold theory successfully explains the properties
of Brillouin comb lasers. Stimulated Brillouin scattering (SBS)-induced time
delay per unit power and per unit length is also calculated using the measured
data of Brillouin gain coefficients. A peak value of 0.09246 ns/mW/m and a
time delay slope efficiency of 1.75 ns/dB are obtained for this tellurite
fiber. Potential performance of a tellurite fiber for slow light generation
is clarified on the base of Brillouin gain characteristic. Our results show
that tellurite fiber is a promising gain medium for Brillouin fiber amplifiers,
lasers, and slow light generation due to its low background loss and large
Brillouin gain coefficient.
© 2008 IEEE
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