Fast transient response of L-band tellurite-based EDFAs and their optically gain-clamped behavior

We reported on the fast transient response of EDTFAs. The transient time of EDTFAs can be one-ninth as short as that of the EDSFAs with similar gain shape in L-band. We also demonstrated optically gain-clamped EDTFAs and showed that the power excursion due to SHB is comparable to or smaller than that in EDSFAs. The relaxation oscillation frequencies also give us information about the fast dynamics within EDTFAs. In summary, EDTFAs show superior controllability over EDSFAs for automatic gain control via either electrical or optical schemes. Further research will include modeling of the dynamic behavior of EDTFAs.