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