High BER when increasing bit rate in bidirectional WDM (OptiSystem)

[Rawezh Yassin]

Hello everyone,

I am simulating a bidirectional WDM system in OptiSystem.

At 2.5 Gb/s, the system works fine and the BER is acceptable.

When I increase the bit rate to 25 Gb/s, the BER increases to about 0.004.

My target is BER ≤ 10⁻⁹, but I cannot achieve it at 25 Gb/s.

What I already tried:

Reduced the fiber length (only small improvement)

Kept the same WDM setup and parameters

Question:
Is it possible to achieve BER = 10⁻⁹ at 25 Gb/s with this type of WDM system?
What parameters should I mainly adjust (dispersion, filters, modulation, power, etc.)?

Any guidance or suggestions would be appreciated.

Thank you.

[Saurabh Bedi]

Hello Rawezh,

Thanks for reaching us.

In order to proceed further and provide you with the most relevant information and support, I would appreciate it if you could share a few additional details about yourself:
• University/Company:
• Job Title:
• University/Company Email:
• Phone Number:
This will help us better understand your needs and ensure we offer the best possible solution for you.

Please provide all the above information at support@optiwave.com.

Warm Regards,
Saurabh Bedi.

[Saurabh Bedi]

Also, if possible, please share your project file in a zipped format along with the other information at support@optiwave.com

We need to have a look at your circuit and simulation parameters to understand the issue.

Best,
Saurabh Bedi.

[Author]

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