{HEAD ~ The output} of {TAIL ~ the photodetector} or photodiode 5 is amplified, bandwith limited and then passed to an ADC 7 
of
{ HEAD ~ The output } of { TAIL ~ the photodetector } or photodiode 5 is amplified , bandwith limited and then passed to an ADC 7
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH