Abstract
Doped with PbSe nanocrystals of different sizes, a multiquantum-dot-doped
fiber amplifier (MQDFA) is proposed. Performance of the MQDFA is simulated
by solving light-propagation equations and rate equations for a three-level
system, and by applying superposed emission-absorption cross sections of the
quantum dots (QDs). Pumped with 980 nm, this proposed MQDFA has characteristics
of broader band, flatter gain, and lower noise than those of the erbium-doped
fiber amplifiers at present. There is evidence to show that two factors, i.e.,
the equivalent Stokes shifts and the full wave at half maximum of the superposed
spectra, dominate the performances of the MQDFA. Also, the equivalent Stokes
shift and the FWHM are tunable by adopting the QDs in different sizes and
choosing the doped number available. It is expected that such a MQDFA may
be able to cover the all waveband in telecommunications if it is optimized
on the doped number, sizes, and doped concentrations of the QDs.
© 2008 IEEE
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