Ultra-broadband Erbium-doped Fiber and Its Gain Characteristics

We fabricated an ultra-broadband Erbium-Doped Fiber (EDF) by the Modified Chemical Vapor Deposition (MCVD) technique. The bandwidth of EDF with gain more than 25 dB is 49.0 nm (1525.0 -1574.0 nm), the Noise Figure (NF) is less than 6.1 dB by 980 nm forward pumping. The saturated output power of EDF is 17.5 dBm. By bidirectional pumping, the bandwidth of EDF with gain more than 25 dB is 53.4 nm (1523.3-1576.7 nm). This ultra-broadband and low-noise EDF is a promising gain medium for optical amplifiers and lasers.