Performance of erbium-doped fiber optical power amplifiers pumped in the 800-nm band

We use a comprehensive computer model to evaluate the performance of erbium doped optical power amplifiers (EDFA) in the 800 nm band. The pump wavelength dependence of the amplifier gain and noise is considered for aluminophosphate (APS-EDFA) and fluorophosphate (FP-EDFA). The existence of band optimum length, where the output remains constant and close to the peak output for a pump band, has been shown for both APS- EDFA and FP-EDFA under saturated conditions. It has been shown that band optimum length exists for both APS-EDFA and FP-EDFA unlike in the case of small signal gain, where the BOL existed only for APS-EDFA. The influence of the signal excited state absorption (ESA) at various pump powers and wavelengths is studied. The performance of power EDFAs with a pump reflecting mirror has been compared with bidirectional pumping and co-directional pumping for both APS-EDFA and FP-EDFA. For small pump powers (Pp ≈ 10 mW) the configuration with pump reflecting mirror is better than bi-directional pumping, both in terms of large signal gain and noise figure (NF) for APS-EDFA and FP-EDFA. At large pump powers (Pp ≈ 200 mW) the output signal powers are comparable and the NF is better for the configuration with the reflecting mirror for APS-EDFA. The signal gain and noise performance is better in the case of FP-EDFA even at Pp = 200 mW