Abstract
By solving the inverse amplifier design problem, gain-flattened O (~
17.5 THz), E (~15.1 THz), and S
+ C+ L (
~20.9 THz) ultrabroadband fiber Raman amplifiers (FRA) are
designed using a new TeO<sub>2</sub>-SrO-Nb<sub>2</sub>
O<sub>5</sub>-P<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub> (TBSNWP) tellurite fiber. When increasing
the numbers of pump wavelengths from two to eight, the gain profiles become flatter, and the effective bandwidth
becomes larger. Relative gain flatness of ~1% could be
achieved over bandwidths of up to 15.1 THz (corresponds to E-band) without any gain equalization devices. When
narrowing the gain bandwidth from the S+ C+ L-band (20.9 THz) to the E-band (15.1 THz), the relative gain
flatness is reduced from 4.51% to 4.12%. The effects of the shape of the Raman gain spectra on the relative gain
flatness and the effective bandwidth are also investigated using the TBSNWP glass with one broad Raman shift peak
(full width at half maximum ~11 THz) and
TeO<sub>2</sub>-Bi<sub>2</sub>O<sub>3</sub>-ZnO-Na<sub>2</sub>O
(TBZN) glass with twin peaks. The simulation results show that the relative gain flatness and the
effective bandwidth of TBSNWP FRA are better and larger than those of TBZN FRA, respectively. Our results suggest
that the TBSNWP glasses are promising candidates for broadband FRA in photonic systems.
© 2007 IEEE
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