In this way {HEAD ~ the total optical path length} of {TAIL ~ the signal} in the time delay unit depends on its optical wavelength 
of
In this way { HEAD ~ the total optical path length } of { TAIL ~ the signal } in the time delay unit depends on its optical wavelength
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH