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