The method 6 wherein the predetermined characteristic is {TAIL ~ a predetermined range} of {HEAD ~ power levels} for the fiber optic signal 
The method 6 wherein the predetermined characteristic is { TAIL ~ a predetermined range } of { HEAD ~ power levels } for the fiber optic signal
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH