Consider an InGaAs APD with excess noise x=0.7, M=10 where M is the multiplication factor. The unmultiplied dark current is 10 nA and bandwidth is 700 MHz.
What is the avalanche photodiode noise current per square root of bandwidth?
What is the noise current for the bandwidth of 700MHz?
If the responsivity (at M=1) is 0.8, what is the minimum optical power for an SNR of 10?