Without the phase matching, while {HEAD ~ the initial input light} has {TAIL ~ the desired shape}, this shape is not retained throughout the traversal of the fiber 
has
Without the phase matching , while { HEAD ~ the initial input light } has { TAIL ~ the desired shape } , this shape is not retained throughout the traversal of the fiber
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH