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Home › Forums › SYSTEM › Noise and EDFA › Reply To: Noise and EDFA

March 3, 2015 at 8:59 am #18156
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Damian Marek
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That should work! There are some changes to make though and I’ll explain why. You might want to look at the attached document where there is a section on Noise Bins.

The first small problem is that the white gaussian noise generated in Matlab function will be an equal power over all frequencies, which is fine if that is what you want to model, but if you are looking at the ASE of the amplifier you will need to be able to represent different powers at difference frequencies. For each noise bin you would need to run this function to generate that frequency band’s time signal and then add them all up at the end.

For an individual noise bin I would call:

x = wgn(1,Sampled_signal_Vector_Length, Noise_power_in_dBm*bandwidth_noiseBin,’dBm’,’complex’)

Since in the noise bin signals the power is interpreted as a power spectral density, which is W/Hz. If this is too complicated to understand I don’t blame you, if you want I can spend some time on a example matlab program.

Regards

Attachments:
  1. OptiSystem_Getting_Started.pdf

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