COMSOL Forums: Linearly Polarized (LP) modes
http://www.comsol.com/community/forums/general/thread/36842/
Most recent forum messagesTue, 07 May 2013 16:43:15 +0000COMSOL Forums: Linearly Polarized (LP) modeshttp://www.comsol.com/shared/images/logos/comsol_logo.gif
http://www.comsol.com/community/forums/general/thread/36842/
Linearly Polarized (LP) modes
http://www.comsol.com/community/forums/general/thread/36842/#p102306
Hi all,<br />
<br />
I'm willing to calculate linearly polarized modes, that is, modes with<br />
only four non-zero components and azimuthal symmetry in a multimode<br />
optical fiber (see for example <a href="http://www.rp-photonics.com/lp_modes.html" title="www.rp-photonics.com/lp_modes.html">www.rp-photonics.com/lp_modes.html</a> ).<br />
<br />
By using the mode analysis study I get to compute the first two LP0m<br />
modes (I'm specially interested in modes LP01, LP02, LP03....).<br />
Although, I have to compute more than 10 modes to get LP01 and LP02<br />
modes. I have incremented drastically the number of modes computed but<br />
I'm not able to get to the LP03 mode.<br />
<br />
I wonder if there is a way I can "force" the results to have (for<br />
example) Ex=0 and Hy=0 ?<br />
Or even better, to force the resulting fields to have azimuthal symmetry?<br />
<br />
A suggestion from the support staff is to restrict to a subset of solutions modeling a slice of the fiber's cross section (see file attached). Unfortunately, with this approach I'm only able to reproduce doughnut type fields (mixtures of TEM modes), but not the LP modes I'm looking for. <br />
<br />
As you can see all the solutions have null electric field at the center of the fiber, while LP01, LP02 and LP03 have a maximum field at that point.<br />
<br />
Thanks in advance.<br />
Best,<br />
--<br />
Felipe BMTue, 07 May 2013 16:43:15 +000036842.1367944995.102306