{"id":355314,"date":"2024-03-05T05:25:51","date_gmt":"2024-03-05T05:25:51","guid":{"rendered":"\/forum\/forums\/topic\/lumerical-interconnect-fiber-pmd-effects\/"},"modified":"2024-03-05T05:25:51","modified_gmt":"2024-03-05T05:25:51","slug":"lumerical-interconnect-fiber-pmd-effects","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lumerical-interconnect-fiber-pmd-effects\/","title":{"rendered":"Lumerical Interconnect Fiber PMD effects"},"content":{"rendered":"

Fiber Model: https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360036108194-Optical-Fiber-FIBER-INTERCONNECT-Element<\/p>\n

I have a question regarding PMD effects on fiber model, in my simulation the chromatic dispersion is diabled (D=0 & S=0), fiber length 9 Km. <\/p>\n

First: according to the model the user should enter differential group delay & PMD coeff. <\/p>\n

<\/p>\n

However, according to the first reference in the model ““Nonlinear Fiber Optics”, if I understand correctly then these two parameters are linked through the following equation: <\/p>\n

<\/p>\n

It is not clear to me how to use the model using these two parameters at all, according to ” Modeling and compensation of polarization effects in fiber-optic communication systems” the delay per each section in the fiber should be calculated directly using the D parameter and the section length, so why do we need an additional parameter as written in the link? <\/p>\n

To illustrate my point, The following simulation is for a 9km length fiber and will make it two sections only (4.5km with zero sigma in length) using the following exaggerated numbers for differential group delay (3.3e-14) and pmd coefficient (3.3e-14) just for illustation, the following pulse response result (absolute electric field) is obtained at the output of the fiber: 
<\/p>\n

I was expecting something different, at the output of the first section of the fiber, there should be two pulses (slow-axis and fast-axis pulses) each of these pulse will couple again into the second section producing the all combination ( slow-slow, fast-slow, fast-fast, slow-fast), so I was expecting something like this: 
<\/p>\n

Please clarify these points to me.
Thanks <\/p>\n","protected":false},"template":"","class_list":["post-355314","topic","type-topic","status-closed","hentry","topic-tag-fiber","topic-tag-interconnect","topic-tag-opticalfiber-1","topic-tag-orientation-of-fibers-2","topic-tag-POLARIZATIONCHARACTERISTICS-1","topic-tag-simulation-problems-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t