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