- This topic has 21 replies, 3 voices, and was last updated 10 years, 1 month ago by
Heitor Galvao.
-
AuthorPosts
-
-
October 13, 2014 at 12:35 pm #14188
Heitor GalvaoParticipantWhat is back2back? How can I put this system please find attached in back2back and validate the transmitter with it after you add again the fibers to see if everything is ok?
-
October 14, 2014 at 9:40 am #14197
Damian Marek
ParticipantHey Heitor,
1) A back to back transmission scheme describes a system where the receiver and transceiver are directly connected with no transmission link. As an example in your attached file, everything inside the loop control would be disabled.
2) I’ll also respond to your private message about the frequency comb project. I’ve modified it in the attached project file to a back to back system. You can either delete the fiber, amplifiers and dispersion compensating fibers or you can directly disable the component in the Simulation tab of the components. I fixed your project file by modifying the receiver. The channels were actually 193.2-193.9 and the cutoff frequency was set in terms of the symbol rate, which should have been 10 Gb/s
Regards
-
October 14, 2014 at 12:13 pm #14214Heitor GalvaoParticipant
Good afternoon Damian I try to open the file in optisystem 13 and the following message appears
-
October 15, 2014 at 9:01 am #14233Participant
I’m not sure why this is happening. It may be because I have a more recent version of OptiSystem than you (13.0.1).
-
-
October 14, 2014 at 5:47 pm #14220Heitor GalvaoParticipant
Goodnight Damian I couldn’t open your palette, do give some error, more made the modifications you cited and actually minlog(BER) improved considerably, but the OSNR, assumes zero value, what do you suggest?
-
October 15, 2014 at 9:29 am #14234Participant
Ok I think I know where the confusion is coming from. The WDM Analyzers is having a hard time finding the different channels due to the way that you generated the frequency comb. Since the frequency comb was seeded with a 193.1 THz laser the signal is “attached” with that frequency value and the WDM Analyzer is assuming that is the center frequency. If you right click the WDM Analyzers and choose “Extend Scan” it will correctly identify the remaining channels and give normal values.
Regards
-
-
October 14, 2014 at 5:49 pm #14224Heitor GalvaoParticipant
Please look what I sent by private message
-
October 16, 2014 at 2:30 pm #14289Heitor GalvaoParticipant
Good afternoon I’m with a doubt relevant Damian who is as follows: when I put a WDM analyzer after the loop control (fiber + amplifier), there are acceptable values of OSNR, more so that there is a but if placed a WDM analyzer in the first channel for example the demultiplexer he will give a value apoximado with WDM anaylzer placed in control loopI understand that the values are equal, is there any kind of loss to give such a difference in values of OSNR? In the annex you see the table regarding the WDM analyzer placed in the control loop, and the right of the WDM table corresponds to the WDM placed on the first channel of the demultiplexer.
-
October 16, 2014 at 2:34 pm #14293Heitor GalvaoParticipant
the same reasoning to the optical comb generator
-
-
October 16, 2014 at 11:28 pm #14300
Ravil
ParticipantHi Heitar, it looks like you have some nonlinearities (according to your OSNR distribution) in your group signal. What is the input power at your MUX?
-
October 17, 2014 at 7:57 pm #14354Heitor GalvaoParticipant
What will interfere to arriving at the power multiplexer?
-
-
October 17, 2014 at 7:44 am #14313Participant
Also, do you have any active element before MUX in your scheme? (I can’t see this part on your pic…)
-
October 17, 2014 at 5:37 pm #14353Heitor GalvaoParticipant
active element mean?
-
-
October 18, 2014 at 12:34 pm #14367Participant
The active elements (amplifiers, boosters, power normalizers, freq. converters) are changing the main characteristics of your group signal.
-
October 18, 2014 at 1:21 pm #14368Participant
In other words, high channel peak power produced by active elements can induce nonlinear effects in group signal of WDM.
-
October 18, 2014 at 1:22 pm #14369Participant
By the way, I can see only transmitted power on your screen shot. Did you measure the power at the input of your MUX?
-
October 18, 2014 at 4:53 pm #14370Heitor GalvaoParticipant
Look, I understand you meant non-linear effects more about the power that is being introduced in the multiplexer, so is there a way to measure it up to where I know is using a WDM analyzer, because until seeing the multiplexer component properties do not have this option.
-
-
October 19, 2014 at 10:30 am #14372Participant
I’d use WDM analyzer for measuring power in this situation as well
-
October 19, 2014 at 10:30 am #14373Participant
According to your last uploaded pic you don’t have any deviation in OSNR (as it was before) and it keeps its high value. Do you still have questions about your results?
-
October 19, 2014 at 11:46 am #14377Heitor GalvaoParticipant
Thank you very much its cooperation was very important
-
-
October 20, 2014 at 10:32 pm #14412Participant
You are welcome
-
October 21, 2014 at 12:44 pm #14425Heitor GalvaoParticipant
Thank you
-
-
-
AuthorPosts
- You must be logged in to reply to this topic.