Furthermore, {HEAD ~ a time difference} between the fundamental mode and highest order mode when the modes arrive at the ends of the mode converters must be smaller than {TAIL ~ a modulation rate} to result in no signal distortion 
Furthermore , { HEAD ~ a time difference } between the fundamental mode and highest order mode when the modes arrive at the ends of the mode converters must be smaller than { TAIL ~ a modulation rate } to result in no signal distortion
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH