Abstract
The possibility of improving the gain and noise figure of a Pr 3+ -doped fluoride fibre amplifier by insertion of an optical narrow band-pass filter or an isolator within the praseodymium-doped fibre has been studied using a comprehensive large-signal numerical model. Three pumping schemes, codirectional, counterdirectional and bidirectional pumping, have been investigated. It follows from the analysis that a gain improvement as high as 8.5 dB can be achieved for a bidirectionally pumped amplifier with an inserted filter compared to the bidirectionally pumped PDFFA without filter. The optimum filter/isolator position for the bidirectionally pumped PDFFA has been found to be in the middle of the active fibre length. For codirectional and counterdirectional pumping, the optimum filter/isolator position varies with the pump power.
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