bit error rate

[anita sharma]

how can I get Bit error rate between 10^-9 to 10^-12 in 16-channel EDFA-WDM system . I have attached the system design.

Attachments:

1. quality-174.osd

[Abdallah Ismail]

This is achieved using FEC,I didn’t see the file till now because the key in the university but if you didn’t add FEC in your design,Your BER will 10e-3 and not 10e-9 because this is value is after FEC correction.

[Abdallah Ismail]

The BER Analyzer is not accurate tool to measure BER,Try to use BER test set,it is more accurate but as i said,you expect BER in the range of 10e-3 because you didn’t use FEC correction.
Regards,

[anita sharma]

thank u for the reply… but I don’t know how to use FEC correction and I didn’t find BER test set in optisystem 7.

[Damian Marek]

Hi Anita,

I found some design errors in your project file:

1) The channels defined in your WDM Demux do not correspond to the WDM Transmitter channels (1546 nm, 1546.8 nm . . .) I fixed this.

2) The Low pass filters did not have the proper bandwidth, because they were using the Symbol rate (but each channel is a bit stream). I fixed this but I would actually recommend using a Bessel filter here. I think Raised Cosine Filter’s are more popular when working with more advanced modulation schemes.

I’ve attached the project file where I achieved ~2e-8 BER. Note that I am using OptiSystem 13.0, so you might have trouble opening it.

Attachments:

1. quality-174.osd

[Abdallah Ismail]

Dear Damian,
Is it possible to get this BER without FEC correction?

[Damian Marek]

Yup, I didn’t change anything besides what I mentioned. This is a very simple system with only a short EDFA segment though.

Regards

[Author]

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