The characteristics of WDM systems with hybrid AGC EDFA in the photonics network

Summary form only given.We proposed a low noise hybrid automatic gain controlled erbium doped fiber amplifier (HAGC EDFA) with both electrical and optical feedback . The HAGC EDFA has lower NF than the conventional optical automatic gain clamped (OAGC) EDFA, equal to normal EDFAs without AGC, controlling the feedback loop light to maintain the state just before oscillation. The HAGC EDFA has less power consumption than the conventional OAGC EDFA with low optical feedback loop light power. Moreover, this HAGC EDFA has good characteristics for WDM systems with add/drop nodes. Even when four of the nine channels are dropped, the deviation of the gain varies only 0.066 dB MAX, and the gain varies only 0.28 dB MAX. The HAGC EDFA should be accommodated in all-optical networks in the near future.