An APD has a quantum efficiency of 45% at 0.85 μm. When illuminated with radiation of this
wavelength it produces an output photocurrent of 10 μA after avalanche gain with a
multiplication factor of 250. Calculate the received optical power to the device. How many
photons per second does this correspond to? [Ans: 77.8 nW, 3.33 × 1011 photon s−1
].
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