To ensure the transmission of DWDM systems, EDFA should has adequate bandwidth, flat gain, low noise, and high output power, among which the flatness of gain is a special feature required for EDFA by DWDM systems.

• 为了确保DWDM系统的传输质量,EDFA应该具有足够的带宽、平坦的增益、低噪声系数和高输出功率。 特别是增益平坦度是DWDM系统对EDFA的一个特殊要求。