{HEAD ~ the optic fiber end surface} is oriented at an angle of 15° to a normal plane of {TAIL ~ the optic fiber center axis} 
{ HEAD ~ the optic fiber end surface } is oriented at an angle of 15 ° to a normal plane of { TAIL ~ the optic fiber center axis }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL