At least two multiplexers are used for assembling {TAIL ~ respective multiplexed output signals} and are connected by an array of semiconductor optical amplifiers , each channel having correspondingly {HEAD ~ at least two SOAs} connecting it respectively to each of the multiplexers 
At least two multiplexers are used for assembling { TAIL ~ respective multiplexed output signals } and are connected by an array of semiconductor optical amplifiers , each channel having correspondingly { HEAD ~ at least two SOAs } connecting it respectively to each of the multiplexers
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH