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