Similarly, the invention is not limited to two outputs: three can be served by providing {TAIL ~ the same number} of {HEAD ~ multiplexers} and as many SOAs for each separated channel 
Similarly , the invention is not limited to two outputs : three can be served by providing { TAIL ~ the same number } of { HEAD ~ multiplexers } and as many SOAs for each separated channel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH