Intrinsic multichannel power control in cascaded power-equalizing erbium-doped fiber amplifiers

We numerically investigate the performance of a cascade of four-channel power-equalizing reflective erbium-doped fiber amplifiers (EDFAs). The EDFAs reflect different channels at different points so that different channels interact with partly different sections of the EDFA. Thus, the gain for different channels saturate partly independently. The channels can self-heal independently in the cascade, which therefore is less sensitive to harmful channel-dependent and channel-independent inter-amplifier loss variations than a cascade of normal, nonequalizing, EDFAs is. Moreover, the design channel-power is maintained even if channels are dropped. In contrast to a cascade of typical nonequalizing EDFAs, we can in addition control the channel power evolution via the pumping of the power-equalizing EDFAs.