Not getting BER Response for OCDMA system

[Chetan Chauhan]

I have tried to develop 5 user MD code based OCDMA system using FBG and direct detection. when i simulate the system, each time BER respose varies but at least 2 receivers’ BER response generated Nothing. I want to know reason behind it or any solution for the same. System is attached here with.

[Ahmad Atieh]

Hello Chetan
There are few examples in OptiSystem on OCDMA that can be found in the example library at:
C:\Users\xxxxxxx\Documents\OptiSystem 15.2 Samples\Metro and access systems\PON and CDMA systems
and
C:\Users\xxxxxxxx\Documents\OptiSystem 15.2 Samples\Software interworking\OptiGrating

You may use the base design to example to 5 users.

Which OptiSystem version are you using?

Regards,
Ahmad

[Chetan Chauhan]

Dear Ahmad Atieh,

Thank You for gentle response. I will surely go through those sample systems.

I am using OptiSystem vesion 15.
the problem I am facing with designing system are:
1) How to simulate for higher users 2) how to get constant (almost near around range) BER e.g.e-14, e-13, e-15 For all active users. Currently I am getting large variation in BER for each receiving users.
I have attached file for same here named md_5use2W

When I try to go for White light the system doesn’t work. File for same I have attached named as DD SAC.

Can you please point out my mistakes to overcome above problems and suggest probable changes?

Hoping for quick gentle response

[Chetan Chauhan]

Forum is not allowing me to upload osd file

[Chetan Chauhan]

C:\Users\xxxxxxxx\Documents\OptiSystem 15.2 Samples\Software interworking\OptiGrating

I tried above system.
but Actually while implementing SAC-OCDMA with MD code
e.g if I consider 5 users with code weight 2
code will be U1= 1 0 0 0 0 0 0 0 0 1 U2 = 0 1 0 0 0 0 0 0 1 0 U3= 0 0 1 0 0 0 0 1 0 0 … U4 and so U5.
Now I am allocating wavelength = U1 = 1550.1 and 1551 U2= 1550.2 and 1550.9 …spacing of 0.1 nm for each wavelength for users.
at receiver end I am using same grating value to detect signal using direct detection. But I can’t. And I even tried to change power levels and also sample rate.

Can i get solution for same?

[Ahmad Atieh]

We provide “full” technical support to only users with valid maintenance and support license. Please let me know if you have such a license.
What I recommend you to do is go through the examples I’ve mentioned earlier and use them to debug your project.

Regards,
Ahmad

[Chetan Chauhan]

Okay. We are in process to purchase licensed version.
Thank you for help and suggestions.

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