How to reduce the photodiode detect noise?

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xuruquan

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I use photodiode to detect the fiber sensors,but the noise is big ,so i can't detect the peek of the pulse ,who knows how to reduce the photodiode detect noise??
thank you!
 

Re: photodiode!

xuruquan said:
I use photodiode to detect the fiber sensors,but the noise is big ,so i can't detect the peek of the pulse ,who knows how to reduce the photodiode detect noise??
thank you!
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Normally the noise like fliker noise operate at low frequency, try implement the bandpass filter to eliminate unwanted noise.
 

Re: photodiode!

The photodiode usually comes in a package that allows good fitting and alignment of fibre to diode. Your experience is rather unusual.

You can use a waveguide filter, if you know the band of the light frequencies to pass.
Another possible reason is perhaps due to the mode used and dispersion in the fibre.
 

Re: photodiode!

Is the noise present when the diode is covered over with black material? Does the noise rise when a signal is present? This last item is called RIN or relative intensity noise. Use another type of detector diode if this is the case.
 

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