[Taiwo Ambali AbiolaParticipant]

Can you try from minimum bit rate first. You can start from 622Mbps then 1GHz and proceed to a higher speed.

[Taiwo Ambali AbiolaParticipant]

Hello brother. Your question would be more clearer if you can explain what you are trying to achieve by this setup. if it is a simple WDM system, all i know is that you would detect your signal by using the same wavelength used at the transmitter. Tell us what you are trying to achieve by coupling two different wavelength with a data carrying wavelength.

Thanks

[Taiwo Ambali AbiolaParticipant]

Thanks a lot Karan. I will try them now

[Taiwo Ambali AbiolaParticipant]

Thanks to all for your contributions. I really appreciate your suggestions. Meanwhile, I think by deleting the subsystem, it would delete all components enclosed in it. which means one has to redesign the system again if the original files have been replaced with the modified ones. In case of any better options, I would still be looking forward to that. Thanks a lot

[Taiwo Ambali AbiolaParticipant]

Thanks for the good question and the right answers given so far. As far as I am concern, I have really learned a lot from the post. one thing that is missing so far is that both must be power of two. That is , 2^(x). The higher the sequence length, the more data to work on, and the better the result you get, though at the expense of your system memory as said in some posts.

Although, one thing that is yet to be cleared to me is that, if the memory of my system is higher than that of the others, I will definitely get better results base on my ability to increase my sequence length. Then, whose system (the one with higher or lower memory) can we use to predict a real experimental implementation or are these parameters (sequence length, etc) equally adjustable in the experiment?. Thanks alot

[Taiwo Ambali AbiolaParticipant]

First of all, you are welcome to the forum the same way I would equally welcome myself after a long break due to a number of task at hand. Just as Lalit Verma has already said, the forum is more of a way to implement your design using optisystem softwares and some others. There are some factors you need to consider when talking about SAC-OCDMA. One is how many users, which light source do you want to use (LED or multi-wavelenght laser,white light), which code do you plan to use, (eg, OOC, MQC, KS, MS code) and also the decoding techniques you have chosen to use.

Whichever way, You have the light source (example LED), the spliter(divide into number of users), the FBG to implement the chosen code, modulator to modulate the light using the bit sequence from the PRBS with a specific modulation format ( such as NRZ, RZ, and other advance modulation formats such as QPSK, DPSK etc). Then you need a power combiner/coupler to couple the signal from different users. then you select your channel of communication (free space optics (FSO) or fiber). At the receiver, you equally need a splitter, to divide the combined signals into the number of receivers. Then you apply your chosen decoding techniques e.g(direct decoding, complementary, AND decoding or any other you have chosen). after selecting the decoding measure, you need a photodetector (to convert to electrical signal), low pass filter (to remove noise) and also BER analyzer (which gives you error rate by comparing your received signal with the transmitted one, then gives you the rate of error in your system. If you can recollect, A minimum BER of 10^-9 and below e.g (10^-10, 10^-15, 10^-18, 10^-30 etc) is the standard for effective communication. You can modify the parameters to suit your design. I hope the explanation helps. Kindly signify if you need more help. There are professionals like Ravil, Samson, Optiwaves teams, and others to help with more information.

[Taiwo Ambali AbiolaParticipant]

Hi Damian, Thanks for your usual support. How can we get the PdF documentation for optisystem version 13.0.3. We currently have version 13.0 and would like to have information on the latest version.

Thanks

[Taiwo Ambali AbiolaParticipant]

Interesting issue raised by Muhammad Boron., However the topics relating to the usage of BER test set in place of BER analyzer have been discussed previously in some of the earlier posts. Any of these might be beneficial to you. I think you have to check the components property of the BER test set before you can actually read the received BER information.

DPSK with optical modulation

WDM QPSK THROUGH FSO LINK

OWC QPSK Design

visible light coomunication

https://optiwave.com/forums/topic/how-do-we-connect-bre-analyzer-to-a-dp-qpsk-reciever/ and several others.
enjoy!!!

[Taiwo Ambali AbiolaParticipant]

Thanks Damia for the useful response

[Taiwo Ambali AbiolaParticipant]

Quite educative. Thanks to Alistu for bringing the topic and Damian for the quick response.

[Taiwo Ambali AbiolaParticipant]

Yes, I understand. Thanks so much

[Taiwo Ambali AbiolaParticipant]

Sorry Hagger, which version of optisystem did you use?. Could you pls attach a sceenshot of the setup. I personally could not open the file here.

Thanks

[Taiwo Ambali AbiolaParticipant]

I see! Thanks alot Samsung. Actually I am working with 1550 nm windows and the problem has been solved by Alessandro suggestion. I think the refractive index also comes to play there. Perhaps the refractive index of the fiber I used coincides with the one that could give 50ns though I didn’t check the refractive index.

Thanks so much for you suggestions.

[Taiwo Ambali AbiolaParticipant]

I also got the method to convert it to angle to be = (360*time delay)/Period
where Period = 1/F(frequency).

So with that, my 50 ns delay is equivalent to 180degree (Pie) delay since I am running on 10MHz frequency which means the period= 100ns

Thanks a lot.

[Taiwo Ambali AbiolaParticipant]

whaooo, this is quite helpful. Thanks so much Alessandro. I now got the delay to be 50ns as attached in the image.

Really appreciate this.

Attachments:

1. 

   delay.jpg