{"id":390427,"date":"2024-10-18T14:47:20","date_gmt":"2024-10-18T14:47:20","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/taper-simulation-eme\/"},"modified":"2024-10-22T13:27:09","modified_gmt":"2024-10-22T13:27:09","slug":"taper-simulation-eme","status":"answered","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/taper-simulation-eme\/","title":{"rendered":"Taper simulation &#8211; EME"},"content":{"rendered":"<p>&lt;p&gt;Hi,&nbsp;&lt;\/p&gt;&lt;p&gt;I am trying to simulate a taper between a rib waveguide and phase shifter modulator type waveguide in EME (current length of the taper is 10um):&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/18-10-2024-1729261477-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;This is the settup for mode and cells:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/18-10-2024-1729261575-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;these are the boudary conditions:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/18-10-2024-1729261693-mceclip2.png\" \/>&lt;\/p&gt;&lt;p&gt;My port are centered at the middle of the ridge:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/18-10-2024-1729261782-mceclip3.png\" \/>&lt;\/p&gt;&lt;p&gt;In the EME setup I am using user defined dielectric as the background (1.44) and the structure is Si. I am also using mesh override region.&lt;\/p&gt;&lt;p&gt;When I run the simulations the modes in the waveguide seem off:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/18-10-2024-1729262620-mceclip5.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/18-10-2024-1729262656-mceclip6.png\" \/>&lt;\/p&gt;&lt;p&gt;and neff is 1.33&lt;\/p&gt;&lt;p&gt;Could you advise on how to improve the simulation?&lt;\/p&gt;&lt;p&gt;Best,&lt;\/p&gt;&lt;p&gt;Dinka&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-390427","topic","type-topic","status-answered","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi, I am trying to simulate a taper 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