Hybrid Fiber Amplifiers Consisting of Cascaded TDFA and EDFA for WDM Signals
Erbium-Doped Optical Fiber Amplifiers Pumped in the 660- and 820-nm Bands
Semiconductor Laser-Pumped High-Gain Pr^3^+-Doped Fiber Amplifiers
1.58-m Band Gain-Flattened Erbium-Doped Fiber Amplifiers for WDM Transmission Systems
A 1580-nm Band WDM Transmission Technology Employing Optical Duobinary Coding