- #1

Durianpastry

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- TL;DR Summary
- how to measure the bandwidth of a photodetector and to calculate the shot noise?

I am new to photodetectors. I know there are usually two concepts of bandwidths of photodetectors, i.e the spectral and electrical.

What I do not understand is the electrical bandwidth.

The electrical bandwidth is used to calculate the shot noise of a photodetector. However, the papers usually don't show how to get the bandwidth.

I searched some references, and the bandwidth is related to capacitance and series resistance. So may I measure the EIS to get the capacitance and resistance to calculate the bandwidth?

Is the bandwidth used to calculate the shot noise the same with 3dB frequency?

But it seems that they are not the same?

I am so confused...

May someone tell me how to measure the electrical bandwidth of photodetectors?

What I do not understand is the electrical bandwidth.

The electrical bandwidth is used to calculate the shot noise of a photodetector. However, the papers usually don't show how to get the bandwidth.

I searched some references, and the bandwidth is related to capacitance and series resistance. So may I measure the EIS to get the capacitance and resistance to calculate the bandwidth?

Is the bandwidth used to calculate the shot noise the same with 3dB frequency?

But it seems that they are not the same?

I am so confused...

May someone tell me how to measure the electrical bandwidth of photodetectors?