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目前，在光纤通信超大容量传输系统的研究方面主要是对L波段（1 570 nm～1 605 nm）EDFA的研究，使L波段EDFA的响应时间达C波段（1 528 nm～1 562 nm）EDFA响应时间的4～5倍。其增加系统容量的方法是：提高单个信道的速率、增加信道数减小信道的间隔，以增加整个传输的带宽。比
At present, the research on L-band (1 570 nm-1 605 nm) EDFA is mainly focused on the research of ultra-high-capacity optical fiber transmission system. The response time of L-band EDFA reaches C band (1 528 nm ~ 1 562 nm) Response time of 4 to 5 times. The way to increase system capacity is to increase the rate of a single channel, increase the number of channels, and reduce the channel spacing to increase the bandwidth of the entire transmission. ratio