Search Results for 'wdm'

[alistuParticipant]

Hi Aabid,

Sure. If the transmitter frequencies are changed (for example laser frequencies in a WDM system), then the MUX frequencies must change, and not the bandwidth. But if the bit rate of the system changes, you are probably going to have to change the bandwidth of the filters.

Regards

[alistuParticipant]

Hi Naazira,

I believe you could have easily seen that the script mode has not been used in case of WDM MUX and DEMUX . I mentioned in my above comment MOST of the OptiSystem filters are set that way. So as you know, MUX is not a filter component, although it has filters in it and besides, MOST does not mean ALL.

Regards

[Naazira BadarParticipant]

Hi all..

I think, since WDM systems are used widely, it must be as an aid for testing the system at some levels. eg. a connection, So that we could check if our components of our WDM system are working. But you should still get it confirmed about the system support about this.

Regards.

[Naazira BadarParticipant]

Hi Aabid. Actually what I’m saying is that..A WDM MUX combines signals and transmits simultaneously. And there’s a relation between the bit rate and the bandwidth of the system. But no matter how much we set the bit rate at the source, how come the bandwidth of the WDM MUX still remain same?
Alistu has mentioned that Optisystem calculates the BW as per bit and symbol rate, but I think had it been so, after the simulation run was over, the bandwidth value of the WDM MUX must also have been auto changed.

Another point remains that how come no matter what the value of N in N X 1 MUX, the MUX bandwidth remains same? If there are more no. of inputs channels, the MUX bandwidth should also vary.

[Naazira BadarParticipant]

Hi all..
here’s the link to a related post: https://optiwave.com/forums/topic/optimize-system-performance-when-using-dwdm-mux-not-ideal/

I think this seems convincing enough that ideal MUX puts no limitation of the bandwidth constraint as mentioned rightly by Alistu. Hence the results are better, since no interference takes place. However,in practical systems the bandwidth and other losses are an important consideration. So, I would suggest using a non-ideal WDM MUX for making the simulation results close to the practical scenario.

Regards.

[Aabid BabaParticipant]

Hello naazira,
A very good question indeed. I would also like to know about it. Because if we consider a 4 input WDM MUX , incase it is 10 GHz for each channel then i would be using 40 GHz for my system which is very huge bandwidth.
From the discussion i had with Alistu , i guess this Bandwidth would be to accommodate every channel although i am not sure.

Regards

[Naazira BadarParticipant]

Hi all..
I have a query about the bandwidth of WDM MUX as well. The default value is 10 Ghz. Does it mean it provides one channel this much bandwidth to get transmitted?

[FAYIQA NAQSHBANDI]

Hello every one.

I am using a WDM multiplexer to stack four wavelength channels in a TWDM-PON.I am achieving a good system performance for downstream for each of the four channels.Also i have assumed the insersion loss due to the multiplexer is zero.
But when in the same system,i replace this MUX with an ideal MUX,my system shows a drastic improvement in the performance.
What is it that an ideal MUX ignores apart from the insertion loss which i had already assumed zero in the first case ? and
Why do i see a huge diffrence in the performance of the two ?

[FAYIQA NAQSHBANDI]

Hello everyone

Which filter can be used to provide a good tuning capability in TWDM network ?

[Aabid BabaParticipant]

Hi Alistu,
To be quite honest I had never ever checked for the bandwidth criteria of any component like WDM Mux or Demux because i thought other parameters like power, system bit rate , symbol rate blah blah are most important parameters to better the performance of the system and because my results were improving just because of changing such parameters i never thought of bandwidth thing. Anyways i am so grateful for sharing such valuable points.
regards

[mukalla pavan]

hi
i want to replace 16-qam instead 4-qam in coherent optical qam wdm optical ofdm..but i am getting bit error rate of 0.483

please suggest me the changes needed

i am attaching the file

[Aabid BabaParticipant]

Hello Alistu,
I want to ask you what is the theoretical aspect of WDM MUX and the bandwidth leaving apart the simulation scene in optisystem? Please can you explain it or share some paper which explains about the WDM Mux and the bandwidth thing. I am very much confused about this realization between WDM MUx and bandwidth.

Best Regards

[Aadil Raza]

Dear All,

As we know the default 3-dB bandwidth of WDM Demux is 10 Ghz. can we have this bandwidth less than 10 Ghz ( 5 0r 7 Ghz etc) practically. if yes the upto which extent we can have this bandwidth?

[LisaaaaParticipant]

Hi Alistu
I have make some improvements on my design and could you help me to find the problem of this. See my improved vision in the attachment.

As you mentioned the background information, my aim is to set up a ring network to identify optical power management issues.In this WDM ring network, there are four nodes.In each node, there are two transmitters supply two different frequency signals into the main network. I have no idea of why this system is wrong.Maybe some mistakes in the value of those components.Please help .Thank you so much.

[alistuParticipant]

Hi Tung,

A simple change you can make in order to get better results in your system would be to increase the input laser power level if it is possible for you in the WDM transmitter component. I increased the power to 7dB and I got Q-factor of more than 6. Please try it and see if it is helpful.

Regards