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Step index fiber

In the simulation of step-index fiber if i place a particle beside the core and want to evaluate a line integration of the
following equation ----------------

there arises an error saying that .......
"Failed to evaluate variable nz".

Is it because, i am not taking 3D model ???
Is there any way to incorporate this equation into 2D model?

0 Replies Last Post Apr 21, 2013, 10:14 AM EDT
COMSOL Moderator

Hello Rakibul Islam

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