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