{HEAD ~ The optical power}, e.g. from a high power laser, is conveyed via {TAIL ~ an optical fibre} to the controlled device 
is conveyed via
{ HEAD ~ The optical power } , e.g. from a high power laser , is conveyed via { TAIL ~ an optical fibre } to the controlled device
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH