calculation time

Hi Mohammad,

The reason for calculations taking so long is that a lot of power is injected into your lines and therefore, nonlinearities occur. I suggest that you lower your amplifier gains to 10 dB (which is enough for the attenuation caused by each optical fiber) and then start simulation.

Regards

High power cause calculation time due to non linearities I have analzed you system ,your calculation time will reduce if you calculate edfa gain as 50 km smf x 0.2 dB attenuation per km which is equal to 10dB.but your systen has some problem that i couldnt get signal on visulizer.corrupted signal is there.please share paper you wqnt implement for more detailes

Welcome Namera,it would be great if you again attach the paper,i think you forgot to attach paper or system may missed the file you uploaded.We will help you as immediate we can and try to reproduce your paper.Thank you

What value you are reffering too? In general according to ITU,system q factor should be 10^1 and powers of it and ber should be in the range of 10^-9 to 10^-12.10^-9 is maximum error error rate that can be accepted.

I think I explained it a little unclear. What I meant was that if you take a look at both eye diagrams, you’ll notice the one belonging to the paper is about 20 a.u. open, while yours is about 50 a.u. open. So your system implementation has acquired a better Q-factor than the one acquired for the simulations in the paper.

i would like to know if its ok that my DWDM design is taking 20 hrs of simulation through HNLF in optisystem 7.0. also i amunable to open any attached .osd files posted on this forum

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thank you so much sam , i use total input power of 1 mW for WDM transmiier which gives nearly -20 dBm per channel signal . i would try to optimize it with -26 dBm for sure . thanks again for guiding.

Hi Gaganpreet,If you set the value of power in WDM transmitter , say 0dB than ,this 0dB value is for each wavelength not distributed between each single Tx channel.For example for 0 dB Pin then output power of each channel is around -2dB which is somewhat close to 0 dB ,attenuation in signal is due the insertion losses caused by modulator . So if you launched 1mW then each channel oprate at this much power.If you use 100 channels as you said then see the total power 100x1mW approx.That is why your system takes very long time for calculations .Otherwise this much time is no taken by any system.
Alessandro cleared this in one of forum topic that data rate set in the WDM Tx is for different wavelengths and in the same way power input is same for each channel.
Hope you got my point and it helps you in better way.

SAm u may be right but when i connect WDM ,dual port WDM analyzer the input signal level is -20 dBm at each wavelength while my input is 0 dBm .if same input power is given to 16 channel system at output of ideal Mux the WDM shows each input signal power at -5 dB.

Gagan you can do a basic thing.connect optical power meter right after to wdm transmitter to each port .in this way you will able to see the piwer at each port.After wdm multiplexer there is addition of losses which is due to the insertion loses etc.kindly share a paper from which you made Hoa.then it will clear to me what is a design of your hoa.It would be great if you share system file ,i will correct it into same version you have.
Thank you

thats gr8 idea i never thought of to measure per channel power . thanks a ton. my HOA is a novel one and i am really not advised to share it till i make it to some publication. i hope u understand my concern . but i have seen another thing if i change my data rate beyond 40 Gbps the simulation time is drastically reduced for same powers but at 10 Gbps time taken is too long. though gain remians almost same but OSNR is drastically reduced. its probably that noise power increases at high data rates .