Temperature Influence on the Radiation Responses of Erbium-Doped Fiber Amplifiers

摘要

The gain degradations of an Er-doped fiber amplifier (EDFA) during the exposureof its active Er-doped fiber to 40 keV X-rays (≈2.7 mrad(SiO_2) s~(1) up to 300 krad)at three different temperatures: 40, 25, and 120 °C, are characterized. Thespectral dependence of the fiber radiation-induced attenuation (RIA) is monitoredin situ in the 900–1600 nm spectral range, highlighting a combined temperatureand radiation effect on the near-infrared RIA levels and kinetics. At the systemlevel, the kinetics of EDFA gain degradation are only slightly affected by varyingthe irradiation temperature for the tested backward pumping EDFA configuration.On the theoretical side, a homemade computer code based on the particleswarm optimization and the rate equations to model the radiation behavior ofEDFA is used, considering only the RIA impact on its gain. Despite a goodagreement between experimental and simulation results below the dose of70 krad corresponding to current space missions, the comparison between themodeled and measured gain degradation kinetics at higher doses shows that amore precise modeling of the temperature impact on the absorption properties ofthe erbium ions is necessary to better reproduce the EDFA radiation behavior forfuture space missions.