Furthermore, 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 {HEAD ~ a modulation rate} to result in {TAIL ~ no signal distortion} 
to result in
Furthermore , 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 { HEAD ~ a modulation rate } to result in { TAIL ~ no signal distortion }
OTH OTH OTH OTH OTH 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 HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL