Search Results for 'wdm'

[alistuParticipant]

Nonlinearity factors include self-phase modulation and some other factors that may cause problems for WDM systems. in order to eliminate the effect of this factor, you can click on “nonlinearity” tab in the optical fiber properties to see all the related settings there. Can you explain more about polarization?

[Swapandeep KaurParticipant]

thank you so much sir. I only need to compare the performance of optical amplifiers individual and hybrid amplifiers in 16,32 and 64 wdm system.

[alistuParticipant]

Hi Tung,

In order to improve the performance of the system with real WDM components, you need to consider the bandwidth defined in the WDM MUX and DEMUX the same as the transmitted bandwidth. I suggest changing it to 11 GHz or 12 GHz (which is about 0.1 nm). The ideal MUX gives all the bandwidth they need and that’s why the signal is better.

Regards

[Swapandeep KaurParticipant]

What is the use of loop control that has been used in wdm examples of optisystem?? can we design the system without it?

[Tung Tran Van]

I have to simulate a realistic DWDM system, so I can’t use a ideal MUX. But BER is bad (~10^-7) (no optical fibers & amplifiers), while using the ideal MUX, BER is very low.
How do I optimize MUX’s paramaters to improve BER (~10^-12 – 10^-9). Thanks.
I attached my tesing project.

[alistuParticipant]

Hi Gaganpreet,

The choice of using between RZ and NRZ are actually available in OptiSystem (I know about OptiSystem 13). When you open WDM transmitter component properties, you can choose “coding” tab and there you can see the “modulation type” options, where you can choose between RZ, NRZ and Off.

Regards

[gaganpreet Kaur]

Can anybody share design of WDM system in MATLAB. i want ot implement a coherent system model . but i don’t know how to design in MATLAB. even in optisystem when it comes to WDM system design we dont have choice of using advanced modulation formats as we can do for NRZ, RZ from drop down menu in parameters of WDM transmitter we need to separately apply our modulation at each single channel. this becomes tiring and cumbersome for channel count grater than 16 channels.any solution pls?

[Fady]

Could you please post a bidirectional WDM OFDM PON example here or at least bidirectional OFDM example? Thank you!

[gaganpreet KaurParticipant]

Hi alistu my question was in general sense only. actually my research is on parametric amplifiers but i did’nt find parametric amplifiers are much explored as widely used optical amplifiers for WDM systems . even today and from past many years optical amplifiers research is revolving around EDFAs. though my simulation results for parametric amplification outperform EDFA or its hybrids still a doubt remains on is their any practical limitation which leads to its low popularity and usage.

[gaganpreet KaurParticipant]

That was quite a consolidated information on optical amplifiers whcih is helpful to understand their differences at glance.But there is no mention of parametric amplifiers. from whatever knowledge i have gathered i understand parametric amplifiers to be wideband tunable amplifiers which are quite required by WDM systems snd with availbility of high power pump lasers their dependence on EDFA has led to their independent capabilities being exploited still normally parametric amplifiers rarely draw any interest in discussion of research… do i miss any of their disadvantages?

[Swapandeep KaurParticipant]

thank you sir. sir actually i want to design tdm system using raman-edfa ,soa-edfa,raman-soa and also the individual amplifiers for eg 16,32 bit tdm system and compare it with a wdm system.

[Swapandeep KaurParticipant]

we design wdm system using hybrid optical amplifiers. can we also design a tdm system using them>?

[gaganpreet KaurParticipant]

Hi alistu i want to understand the difference between dynamic model and average model of Raman amplifier. which model should be used for WDM implementation.

[Alessandro FestaParticipant]

Hi Heitor,

you can find the WDM standard here:

https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-G.694.1-201202-I!!PDF-E&type=items

Best Regards,

Alessandro

[Alessandro FestaParticipant]

For WDM ITU standard you mean the ITU-defined grid for wavelengths at 100GHz, 50GHz distance?