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