{"id":391232,"date":"2024-10-24T12:00:49","date_gmt":"2024-10-24T12:00:49","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/grating-coupler-design-2\/"},"modified":"2024-10-25T14:38:07","modified_gmt":"2024-10-25T14:38:07","slug":"grating-coupler-design-2","status":"answered","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/grating-coupler-design-2\/","title":{"rendered":"Grating coupler design"},"content":{"rendered":"<p>&lt;p&gt;I am designing a grating coupler and the transmission value is negative. I dont understand why is it negative or should I check the absolute value?&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/24-10-2024-1729771137-mceclip0.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-391232","topic","type-topic","status-answered","hentry","topic-tag-photonics"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am designing a grating coupler and the transmission value is negative. 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