Search Results for 'wdm'

[Mohamed Ben zegalamParticipant]

Hi Alessandro

Thanks for your reply. The example is WDM PON from Metro and Access system folder. My project is
CO-OFDM. I know they are different design, but I just want to know why both
of them has different shape of BER curve while they have almost the same
value.and is mine is consider as good or not.

I already get the explanation from optisystem support team, and here their answer

“The reason your eye diagram looks like this is its connected after the
decoder and the NRZ generator, which means your signals can only have “zero”
or “one” and that’s why they look ideal. For a more accurate view of the eye
diagram, you have to connect the visualizer before a decision has been made
on the electrical signal. However, you can’t really do that on the OFDM
because the output is not actually electrical. The decision is made inside
the OFDM component.

By the way, you are using our old OFDM component, which to be perfectly
honest, is not very good. For better results, please switch to our latest
OFDM components. They are a huge improvement over the old ones. I think you
have to be using at least OptiSystem 13.0.3 for them.”

[alistuParticipant]

Hi Marvi,

You’d better use CW laser array as the laser source. Also, you should use a separate PRBS generator for each user, otherwise it negates the reason for using WDm in the first place. I suggest you use WDM transmitter component in transmitters library, which contains both PRBS generation part and the optical power source.

Regards

[Marvi grover]

i am attaching a system designed in optisystem. kindly take a look at the transmitter part and let me know if it is a valid system. Is it possible to use a single continuous wave laser as the source(for a WDM system), split its output using a fork and then use MUX for wavelength division multiplexing??. also here the modulator is used after the MUX. will this system produce a multiplexed output.

i shall be really grateful for any help provided

thankyou

[Mohamed Ben zegalamParticipant]

Hi Feras,

you can use the Electrical carrier analyser to measure the SNR for the electrical mode, and WDM analyser to measure OSNR for optical mode.

[Krusic Rijec]

Hello everyone,

I want to create very sample optical communication system (about modulation, amplifier, coupling, filter etc.) with optisystem 13.0?

Do you have any example for this? And I want to test this system with test components (powermetre, WDM analyzer etc.)

Could you help me please?

Thank you so much!
Have a nice day.

[–Participant]

Hi Dhiman, WDM interleaver DeMUX is optical domain component. So it cannot be used for electrical signals. I wanted to know if there is any system already in optisystem.

[Dr. Dhiman KakatiParticipant]

Dear Gokul,
I think There is no interleaver in the electrical domain in optisystem V13, If you can manage to do it optical domain, then there is a component called WDM interleaver Demux.

Regards,
Dhiman

[alistuParticipant]

Hi Hamdi,

For low-power laser, linewidths up to a few kiloHertz can also be found according to wikipedia. However, the ampunt I mentioned for the linewidth was used in the paper “Transmission simulation of coherent optical OFDM signals in WDM systems” by Bao as a conventional value for commercially available lasers, and the references are given in the paper (even though they are not datasheet). I hope this helps.

Regards

[Sss]

How can I set constraints in the MPO optimization setup? The only available option is to set the results to a target value.

[Eng. YanParticipant]

Hi Arpita Gupta,

in order to represent the optical code for each user. you can use even just one optical source. since one source is applicable to support up to 20 wavelengths. in that, you can use WDM Demus to slice the broadband spectrum. As mentioned above, FBG can be used to represent each code length.

Regards

[alistuParticipant]

You’re welcome. Can you please give a reference on the examples you mentioned about the relation between bandwidth and the bit rate? I think some values you have mentioned are far greater than the actual values of bandwidth for the corresponding bit rate. Of course, in WDM a gap between channels is also considered in channel spacing.

[ferasParticipant]

hi alistu ,
actually the system run well on 120 Mbps for one channel ( without using WDM ) but i want to increase it to 240 Mbps by using WDM .
thank you for your interested

[feras]

hello everybody,
i had designed a 64QAM-OFDM over fiber optic simulation that transmit data on bit rate=120 Mbps for 10 Km , and i had a good result in that simulation , but whene i tried to increase the bit rate to 240 Mbps by using WDM technology ( 2 x 2 ) i didn’t get the right result and i didn’t know why,
i will attach my design here if anybody want to see it , and if anybody can help me please to improve the behavior of the system and get a good result in the receiver side .

[LALIT VERMAParticipant]

Why u r not using FBG or optical filter in receiver side,becoz u can get optimum filtering using that.as spectral source slicing is more suitable for wdm.

[nadzreen]

dear all,

i need further explanation about global iterations. the explanation given in manual is not very clear. kindly answer my following question:-

-why in DPWDMA results have 2 frequency
-signal index come from which source?
-why for each sweep iteration got multiple index signal

thanks