Log(BER) vs OSNR

[Aadil Raza]

Dear All, Can someone please attach a very simple setup where we can have graph for Log(BER) vs OSNR?

Regards

[Aadil Raza]

Please someone can modify the attached file for getting realistic log (BER) vs OSNR cure with sweep values….please help me out..
you will see in the attached file that before PIN diode I am getting very high OSNR (51.16 dB) for BER 10e-9(which I think is not realistic).
Regards

[Aadil Raza]

Snapshot also attached of setup

[Rajguru M. Mohan]

Hi aadilqau,

I think we can’t plot graph for Log(BER) vs OSNR as per your block diagram in the image.
In the figure you have showed the simple NRZ modulator with BER analyzer.
BER analyzer will give the values of Min. BER and Max. Q-factor.
We can plot the values of Min. BER and Max. Q-factor with respect to Input Power of laser in dbm or length of fiber.
But how could we plot Log(BER) vs OSNR.
I would suggest you to please upload another image of block diagram.

Thanks and Regards
Rajguru

[Rajguru M. Mohan]

Hi,
We have a relation between OSNR and BER as:
We can also use WDM analyzer to check the OSNR.
Given the OSNR, the empirical formula to calculate BER for single fiber is

Log10 (BER) = 10.7-1.45 (OSNR)
Example:
Assume that OSNR = 10.5 dB
ThenLog10 (BER) = 10.7-1.45 (20.5) = -19.025
Therefore BER = 10^(-19.025)
BER is approx 10^-19
I think it is approated way to calculate BER from OSNR

Hope this will help you.

For more information you can refer to :

OSNR vs Log(BER)

How to plot BER versus OSNR

BER versus OSNR

plotting result graphs

[Aadil Raza]

Thanks for reply. I want you to modify this setup such that we get log (BER) vs OSNR grpah.

secondly whay I am getting very high OSNR (51.16 dB) for BER 10e-9 fpr attached setup.

Regards

[Author]

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