- This topic has 19 replies, 4 voices, and was last updated 10 years ago by
Ravil.
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March 27, 2015 at 10:38 am #19049
Joseph JiangParticipanthello everyone，i use a loop control to simulate a long distance system.however it occurs to a error.I use a bidirectional optic-fiber.can anybody give me a help?thank you in advance!
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March 27, 2015 at 9:57 pm #19059Joseph JiangParticipant
My friends,I want your help!thank you!
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March 28, 2015 at 2:13 pm #19068
Ravil
ParticipantHi Joseph,
I have a couple questions according to your attached scheme. First, what kind of regeneration scheme do you consider? In general, 3R regeneration is applied for long distance communications at the end of the transmission section due to several reasons. In your case, I don’t see any amplification at the receiver side. Second, what is the bandwidth or the bit-rate of your transmitted signal? If I’m not mistaken 0.1 nm corresponds to 12.5 GHz…
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March 29, 2015 at 3:05 am #19075Joseph JiangParticipant
hi,RAVIL,Thank you for your reply!the bit rate of my project is 100MBps.I just want to know why it ocurrs to error when i use the device loop control.as far as i know,the example use of loop control is unidirectional fiber rather than bidirectional fiber.i just want to know is it right for my use with loop control and bidirectional fiber.thank you!
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March 28, 2015 at 2:46 pm #19073Participant
Here is one more detail which I forgot to mention before, unfortunately. Why did you choose Bessel Optical Filter at the receiver for your scheme? Can you indicate the reason why/if you consider it as an optimal choice? As far as I know, Raised Cosine Filter is used for Long Haul (long distance) transmission to reduce the inter-symbol interference…
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March 29, 2015 at 3:08 am #19076Joseph JiangParticipant
yes ,i agree with you.thank you for remind me!
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March 29, 2015 at 11:30 am #19080Participant
You are welcome, Joseph!
Good luck with your project! Let me know if you have more questions, I will try to help or advise.
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March 29, 2015 at 10:05 pm #19086Joseph JiangParticipant
Thank you，RAVIL!i just want to know is it right for my use with loop control and bidirectional fiber.There is anther question about the version 7.0 of optisystem.i find that the bit sequence length and samples per bit should not be more than 512bit and 64 samples per bit.if not ,it occurs to error.i want to know why it happens?thank you!
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March 30, 2015 at 6:37 am #19098
Abhishek ShramaParticipantReduce samples per bit and you will be able to increase the sequence length.
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March 30, 2015 at 6:39 am #19099Abhishek ShramaParticipant
As per you attached screen shot. i an confused why you are using bidirectional fiber in unidirectional system? You have no tx rx at both sides u can use unidirectional fiber for this system
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March 30, 2015 at 7:15 am #19101Joseph JiangParticipant
thank you for your reply!the reason why I use the bidirectional fiber rather than unidirectional is that i want to add the effect of double rayleigth SCATTERING to my system.thank you!
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March 30, 2015 at 5:11 pm #19119Participant
Hi Joseph,
Sorry for my late reply… You can definitely use a loop control with a bidirectional fiber from the theoretical point of view. However, according to your attached scheme (by the way, is it your final version with all modifications you mentioned above?), I am not exactly sure how you are implementing this bidirectional connection, i.e. at each side of your scheme you have only one transmitter or receiver. Can you explain it to me briefly?
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March 30, 2015 at 9:53 pm #19131Joseph JiangParticipant
Ravil，the reason why I use the bidirectional fiber rather than unidirectional is that i want to add the effect of double rayleigth SCATTERING to my system.however,it occurs to error when i use a bidirectional fiber especially when it is a short distance. I wander if it is a error use loop control when i add a bidirectional fiber.thank you!
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March 31, 2015 at 2:57 pm #19168
Damian Marek
ParticipantI am getting the same problem. I suggest skipping the loop and just daisy chaining the bidirectional fiber.
Regards
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March 31, 2015 at 9:26 pm #19184Joseph JiangParticipant
OK.THANK YOU DAmian，i will do that work!
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March 30, 2015 at 6:04 pm #19121Participant
According to your question about bit sequence length and samples per bit (in case if you didn’t fix it yourself), you can find necessary directions in a guideline file OptiSystem_Getting_Started. According to them you should have:
Time window = Sequence length * 1/Bit rate
Good luck!-
March 30, 2015 at 9:57 pm #19134Joseph JiangParticipant
hi ,ravil,i Understand what you had said and my question is that i find that the bit sequence length and samples per bit should not be more than 512bit,or it occurs to error.it will not happen when i simulate the same project in the optisystem 13.0.i want to know why it happens?thank you!
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April 2, 2015 at 3:20 pm #19248Participant
Hi Joseph,
I see what your question is now, just want to make sure what kind of error you are getting (screen shot would be helpful). If it’s related to the limitations of the current version you are using then the reason is obvious: lack of software resources. The other ideas may come up after I see the message error you are getting.
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April 3, 2015 at 10:24 pm #19267Joseph JiangParticipant
OK,thank you so much！I think it may be that they have do optimization algorithm to calculate more samples in optisystem v13.0.
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April 5, 2015 at 10:22 am #19297Participant
Hi Joseph,
You are welcome! And yes, I can remember from one of the previous forum about optimization question. The algorithm was optimized for higher capacity (in number of samples) in OptiSystem 13.0.
Good luck!
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