Optical Signal to noise ratio

[jyoti raina]

Hello Everybody.

I am actually designing a four channel basic wdm system and no doubt i am able to calculate the min ber and max quality factor of each receiver on the reception side.. Here i would like to ask if it possible to calculate the overall signal to noise ratio of the whole system . Please can you tell me if there is some procedure or method to do so.. i want to calculate the optical signal to noise ratio (OSNR) of the system.. I hope i will get some response from you people..
Thanking you in advance.

with Regards
jyoti sharma

[Dr. Dhiman Kakati]

Hi Jyoti you can use WDM analyzer for calculation of Optical Signal to noise ratio. I have attached here with a sample that may find beneficial. Thanks

Regards,
Dhiman

Attachments:

1. 112Gbps-Coherent-DP-16QAM_B2B_externalPRBS-Multiple-Sweep-in-BER.osd

[jyoti raina]

Hi Dhiman Sir.. Thanks a lot. Thank you for your kind efforts.

I Shall try this and see if i get what i want.. I am again thankful to you.

[Dr. Dhiman Kakati]

You are most welcome Jyoti.

Regards,
Dhiman

[jyoti raina]

Thanks Dhiman Sir..
It was really helpful.. I appreciate your kind efforts.

[Dr. Dhiman Kakati]

You are most welcome Jyoti, Nice to see some good question from your side in the forum.

Regards,
Dhiman

[jyoti raina]

Hi Dhiman Sir..
Thank you for your appreciation..

With regards
jyoti Raina

[SAHIL SINGH]

Hi Jyoti

As rightly mentioned by Dhiman we can use WDM analyzer for calculation of Optical Signal to noise ratio… A very useful point figured out by Dhiman.. Hope this helps

Regards
Sahil Singh

[jyoti raina]

Hi Sahil Sir..
Thanks for your reply..indeed it was helpful.i found it on the forum too..WDM analyzer is used to measure OSNR and SNR directly..Thanking you..
With Regards
Jyoti Raina

[SAHIL SINGH]

Hi Jyoti Raina,

You are welcome and as always optiwave forum has provided very useful information… Glad to know that your query was resolved…All the best

Regards
Sahil Singh

[jyoti raina]

hi sahil sir..
i truly agree with you..

With regards
jyoti raina

[Rajguru M. Mohan]

Hi Jyoti,
We could measure OSNR with the help of BER of BER analyzer,
The formula for calculating OSNR from BER is :
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)
For Example:
Assume that OSNR = 20.5 dB
Then Log10 (BER) = 10.7-1.45 (20.5) = -19.025
Therefore BER = 10^(-19.025)
BER is approx 10^-19
I think it is appropriate way to calculate BER from OSNR

Hope this will help you.

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