Fiber 30 has {HEAD ~ one end} coupled to laser 22 and {TAIL ~ another end} coupled to handpiece 36 
Fiber 30 has { HEAD ~ one end } coupled to laser 22 and { TAIL ~ another end } coupled to handpiece 36
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH