Hi,
In Reflective EDFAs, a device (e.g. mirror, grating) is placed at the EDFA output end to reflect whether the pump or the signal (double-passing the pump or signal through the EDFA) produces a net gain enhancement.
In optisystem we have three basic configurations:
EDFA with reflected pump only
EDFA with reflected signal only
EDFA with reflected pump and signal
The configuration presented here is with reflected signal only. The signal is reflected using a reflective filter.
Thanks,