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