The optical waveguide 1 wherein said glass fiber core is non homogeneous and is formed with {HEAD ~ at least two regions} of glass having differing indices of {TAIL ~ refraction} 
The optical waveguide 1 wherein said glass fiber core is non homogeneous and is formed with { HEAD ~ at least two regions } of glass having differing indices of { TAIL ~ refraction }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL