An investigation of small-signal amplification on the 3Po-3F2 transition in a praseodymium-doped fluorozirconate optical fibre at the 632.8 nm He-Ne wavelength, has been conducted. The optical gain is fundamentally related to the
spectroscopic characteristics of praseodymium-doped in a fluorozirconate glass host together with optical fibre parameters, that determine the physical characteristics of
the waveguide. These parameters have been experimentally determined independently of the gain and used to model the performance of the amplifier.