calculation of dispersion values

[Anamika Basnotra]

hiii
how to check the dispersion value in optisystem 13
in its earlier versions, the end of WDM multiplexer or the end of optical fiber gave the dispersion values but not in optisystem 13

[Abhishek Shrama]

Are you looking for the value of dispersion which is set in SMF-28 by default or the broaden pulse after several km of SMF??

[Anamika Basnotra]

no abhishek not the default 1
the one which is accumulated after travelling a certain distance

[Ashu verma]

yes Anamika,i also want to know this thing.Can we simply calculate dispersion like
if D=17ps/nm/km
and length of fiber=10
so my dispersion comes out to be=10*17=170 ps ??
is this work like this????

[Anamika Basnotra]

earlier i had optisystem 9 in which it gave the dispersion values directly at the end of optical fiber and demultiplexer also
i dont know about optisystem 13

[Dr Rk Sethi]

Hi Anamika,
Can you tell, how did you get the value of dispersion at the end of the optical fiber which is accumulated after travelling a certain distance in Optisystem 9.

[Ravil]

Hi Anamika,

I am not sure as well about your way of getting dispersion at the end of optical fiber without any calculations. What was your procedure and what kind of meter / analyzer did you use? Can you share it with us, please?

[Anamika Basnotra]

i did’t used any special component for calculating the dispersion
after running ur design
the point from where the optical fiber is connected to other components, u just have to place ur cursor at that point and it gave the dispersion values. even noise and power values it used to give, but in OptiSystem 9

[Ashu verma]

Deleted(internet error)

[Ashu verma]

Anamika i found a way to calculate dispersion.You can place OTDV on the starting and ending point of your optical fiber.Deselect the automatic range and do this operation
1)Select BIT
2)Start =0
3)End value=10,20 (how many bits you want to see
4) Right click,select marker
5)place on leading edge and trailing edge of pulse,you will get the time of one pulse
6)same you do after SMF and you will get value of dispersed pulse

Please correct me if i am wrong anywhere.

[Anamika Basnotra]

can u plz elaborate
from where i have to select BIT ???

[Ravil]

Hi Anamika,

Thanks for your explanation! I see your point and approach. However, the main question which I have in this case is how will you distinguish the dispersion in optical fiber (caused by wavelength dependence of refractive index or material dispersion) from pulse broadening due to nonlinear effects in optical fiber? The only way I can think of is disabling / enabling nonlinearities when you performing your measurements…

[Anamika Basnotra]

yeah
bt how can this be done now with optisystem 13

[Abhishek Shrama]

Hi,Anamika as Sam sung said you can select BIT from OTDV
Here i am attaching a screen shot.
Once you will do this then proceed as Sam sung mentioned Earlier.

[Anamika Basnotra]

thnkyou abhishek and sam sung for making me understand.

[Ashu verma]

Welcome Anamika,I am also new to optisystem ans have lot of questions.I am working over it so that understand it better.Also thank you Abhishek to support my point .

[Anamika Basnotra]

SAME HERE

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