Reply To: Lumerical Interconnect Fiber PMD effects

[Mohamed Selim]

 

 

Hi Guanhui,

Thank you for the response, I don’t understand what do you mean by “I think you are right that you can define one of the parameters “differential group delay” and “pmd coefficient” to define the PMD dispersion”, the model requires both parameters to work and the results differ alot by defining one parameter only so the model seems to use both, while I think -based on the references I gave- the two parameters are closely linked to each other and are not independent. 
It is not clear to me at all how to simulate the PMD effects of the fiber and the results don’t make sense to me as I told you so kindly clarify that point as it is very important for my research. 

Which test file you mean? For lumerical setup I just use CW laser fed to an AM modulator that is excited by square pulse, very simple setup.

Other thing I forgot to mention, this equation written in the model’s link is wrong from dimensions point of view, 


Because the dimension of Delta_Beta should be (s/m)  while the dimension of the Dp parameter is Sec/sqrt(meter)  (stated as ps/sqrt(km)) 
and that of L is meter.