I want to check the thermal noise spectrum of a photodiode (PD) at different frequency response but I do not know how to calculate it. Below graph is an example which shows noise power (dBm) as a function of frequency. I want to calculate and plot similar graph using our PD. I have tried to use a laser beam with different frequency with same power and detect the signal with the PD. The output signal of the PD is connected to an oscilloscope to record the voltage Vpk. Is this the way to calculate noise power (dBm) using this formula (P(dBm)-10)/20=log(Vpk)? It seems I am using wrong procedure. Can anyone please tell how I can do this? Your answer will be appreciated.
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