Abstract
In this paper, we propose a novel method for controlling the gain spectrum
of a thulium-doped fiber amplifier (TDFA) in the S-band. The conventional
gain spectrum control method used for a silica erbium-doped fiber amplifier
(EDFA) cannot be applied to TDFAs because of the complicated fluctuation of
the TDFA gain spectrum. Our proposed method controls the gain spectrum by
a combination of gain clamping and pump power adjustment. The algorithm for
the method is as simple as that for the conventional EDFA gain spectrum control
method. Furthermore, we describe a function for correcting the gain excursion
generated by the incorporation of amplified spontaneous emission (ASE) at
a signal monitoring photodiode (PD). We achieved a gain excursion of 0.35
dB against a total input signal power of $-$32 to $-$2 dBm.
© 2008 IEEE
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