Hello Saiful
We have moved your post to the more appropriate section dedicated to OptiSystem.
For details on the fiber, have you looked at the datasheet for the “Optical Fiber” or “Bidirectional Optical Fiber” component? The easiest way to get access to the data sheet is to add the component to the design and double-click on it to get the properties and select the help button.
In order to further assist we need to know information do you have on your fiber? Do you have it specific geometry specifications or do you have typical data such as attenuation and dispersion?
Scott
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