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