- This topic has 6 replies, 2 voices, and was last updated 5 years, 11 months ago by
Chetan Chauhan.
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December 19, 2018 at 10:28 am #50107
Chetan ChauhanParticipantI 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.
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December 20, 2018 at 12:02 pm #50148
Ahmad AtiehModeratorHello 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\OptiGratingYou may use the base design to example to 5 users.
Which OptiSystem version are you using?
Regards,
Ahmad -
December 20, 2018 at 12:23 pm #50149Chetan ChauhanParticipant
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_5use2WWhen 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
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December 20, 2018 at 12:26 pm #50150Chetan ChauhanParticipant
Forum is not allowing me to upload osd file
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December 20, 2018 at 12:35 pm #50152Chetan ChauhanParticipant
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?
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December 20, 2018 at 12:39 pm #50153Ahmad AtiehModerator
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 -
December 20, 2018 at 12:46 pm #50154Chetan ChauhanParticipant
Okay. We are in process to purchase licensed version.
Thank you for help and suggestions.
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