C. R. Giles, J. Stone, L. Stulz, K. Walker, C. Burns
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Gain Enhancement in Reflected-Pump Erbium-Doped Fiber Amplifiers
Improved performance of EDFAs is achieved using wavelength-selective reflective filters to double-pass the pump beam. In low-gain amplifiers these filters can increase the saturation output power by 2 dB or reduce the pump power requirements.