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