The time delay unit includes a dispersive element for reflecting the optical signal at an angle that is {HEAD ~ a function} of {TAIL ~ the wavelength} of the optical signal 
The time delay unit includes a dispersive element for reflecting the optical signal at an angle that is { HEAD ~ a function } of { TAIL ~ the wavelength } of the optical signal
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH