Abstract
A new method for gain enhancement in a S-band thulium-doped fiber amplifier
(TDFA) co-doped with aluminum is demonstrated using a macro-bending approach. The
macrobending of the doped fiber in a small radius suppresses both amplified spontaneous
emissions (ASEs) at 800 and 1800 nm band and thus increases the population inversion in
the S-band region. The numerical aperture and core radius of the doped fiber are
optimized so that 800 nm ASE propagates with higher order modes to achieve a significant
suppression while the loss is minimum in the S-band region. Meanwhile, the 1050 nm pump
wavelength should propagate in the fundamental mode to maximize the overlap factor and
thulium ion absorption so that the ASE loss is maximum at the 1800 nm region. Gain
enhancements of about 5–8 dB are obtained with macrobending at the wavelength region
between 1420 and 1470 nm.
© 2012 IEEE
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