Consider an avalanche photodiode receiver that has the following parameters: dark current ID = 1 nA, leakage current IL = 1 nA, quantum efficiency n = 0.85, gain M = 100, excess noise factor F = M1/2, load %3D resistor RL = 104 Q, and bandwidth Be = 10 kHz. %3D Suppose a sinusoidally varying 850-nm signal having

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Consider an avalanche photodiode receiver that has
the following parameters: dark current ID = 1 nA,
leakage current IL = 1 nA, quantum efficiency n =
0.85, gain M = 100, excess noise factor F = M1/2, load
resistor RL = 104 N, and bandwidth Be = 10 kHz.
Suppose a sinusoidally varying 850-nm signal having
a modulation index m =
0.85 falls on the photodiode,
which is at room temperature (T = 300 K). To
compare the contributions from the various noise
terms to the signal-to-noise ratio for this particular set
of parameters, plot the following terms in decibels
[i.e., 10 log(S/N)] as a function of the average
received optical power PO. Let PO range from -70 to 0
dBm; that is, from 0.1 nW to 1.0 mW:
S
(a)
khot
shot
()
(b)
DB
IDB
(c)
=
DS
(d)
(#)
What happens to these curves if either the load
resistor, the gain, the dark current, or the bandwidth
is changed?
is 12
Transcribed Image Text:Consider an avalanche photodiode receiver that has the following parameters: dark current ID = 1 nA, leakage current IL = 1 nA, quantum efficiency n = 0.85, gain M = 100, excess noise factor F = M1/2, load resistor RL = 104 N, and bandwidth Be = 10 kHz. Suppose a sinusoidally varying 850-nm signal having a modulation index m = 0.85 falls on the photodiode, which is at room temperature (T = 300 K). To compare the contributions from the various noise terms to the signal-to-noise ratio for this particular set of parameters, plot the following terms in decibels [i.e., 10 log(S/N)] as a function of the average received optical power PO. Let PO range from -70 to 0 dBm; that is, from 0.1 nW to 1.0 mW: S (a) khot shot () (b) DB IDB (c) = DS (d) (#) What happens to these curves if either the load resistor, the gain, the dark current, or the bandwidth is changed? is 12
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