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# calculation time

(joined April 2015)
Participant

Hi optiwave members;
I have designed RoF diagram but when i made calculation, it takes long time about 2 hours for fiber_1 calculations…..what’s the wrong in my attached diagram.
N.B. i am working on optisystem 7.

regards;

### Responses (27):

• #24651
Ashu verma
Participant

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.

+1
• #24668
gaganpreet Kaur
Participant

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.

• #24691
Ashu verma
Participant

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

• #24714
gaganpreet Kaur
Participant

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 .