Example embodiments significantly reduce computational complexity associated with {HEAD ~ impairment evaluation and path selection} in {TAIL ~ an optical network} 
Example embodiments significantly reduce computational complexity associated with { HEAD ~ impairment evaluation and path selection } in { TAIL ~ an optical network }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL