Add unit test for backward-propagating mode in oblique waveguide #1601
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stevengj
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Jun 16, 2021
bencbartlett
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Sep 9, 2021
…oComp#1601) * add unit test for backward-propagating mode in oblique waveguide * add comment for magnitude of flux * check relative accuracy and reduce resolution for speedup by a factor of three in runtime
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Adds a unit test to verify that for a backward-propagating mode launched within an oblique (single-mode) waveguide, the Poynting flux and the square of the mode coefficient computed downstream from the source are the same.
The figure shows the simulation setup and a snapshot of the Ez fields: an eigenmode source (red line) launches a leftward-propagating mode. The DFT fields monitor (blue line) computes the Poynting flux exiting the waveguide as well as the mode coefficient of the backward-propagating mode. (In this figure, the time-profile of the source is a continuous wave whereas in the actual unit test it is a pulse.)