摘要: A comprehensive behavioral investigation of gain and noise figure (NF) at different erbium doped fiber amplifier (EDFA) configurations is proposed. Configurations such as single pass (SP), single pass with filter (SPF), double pass (DP) and double pass with filter (DPF) are designed, investigated and compared. A continuous increasing of gain value is recorded by changing the configuration from SP to SPF to DP then to DPF. The NF value shows different behaviors at different configurations.