SIMULTANEOUS MEASUREMENTS OF LIFETIME, GAIN AND EMISSION CROSS-SECTION IN A NEODYMIUM-DOPED FIBER

We propose a new method for measuring the gain and the emission cross section of the four-level neodymium system in doped waveguides. It is based on a temporal analysis of the fluorescence decay occurring when the pump is switched off, after establishing a steady-state with high levels of absorbed power. For the case of doped fibers, we have compar ed our results with the usual low signal amplification technique, usin g a launched signal in the fiber, and the agreement is good. The new t echnique allows, therefore, a rapid, simple, method of determining low signal gain.