The scale and {HEAD ~ structure} of {TAIL ~ the first and second photodiodes} and the magnitude of the reverse bias applied across each photodiode are selected to produce substantially the same dark current flowing through each photodiode 
The scale and { HEAD ~ structure } of { TAIL ~ the first and second photodiodes } and the magnitude of the reverse bias applied across each photodiode are selected to produce substantially the same dark current flowing through each photodiode
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH