{"id":396203,"date":"2024-12-04T07:23:34","date_gmt":"2024-12-04T07:23:34","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-understand-the-loss-in-mode-eigensolver-analysis-mode-list\/"},"modified":"2024-12-04T07:23:34","modified_gmt":"2024-12-04T07:23:34","slug":"how-to-understand-the-loss-in-mode-eigensolver-analysis-mode-list","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-understand-the-loss-in-mode-eigensolver-analysis-mode-list\/","title":{"rendered":"How to understand the loss in MODE Eigensolver analysis mode list"},"content":{"rendered":"<p>&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;I&#8217;m trying to understand how to use and relate to the value of the calculated loss in the mode list given by the Eigenmode solver.&lt;\/p&gt;&lt;p&gt;i have simulated a strip waveguide , which has a silicon core and SiO2 cladding (top and bottom). experimentally, and from literature I know that this kind of waveguides are typically suffer from 1-3 dB\/cm loss due to propagation losses at 1550 nm wavelengths (for a straight waveguide, no bends) , but I get very low losses (screenshot of the mode list attached).&lt;\/p&gt;&lt;p&gt;NOTE: I did not define the waveguide&#8217;s z span (I left the default value), which in my model is the propagation direction.&lt;\/p&gt;&lt;p&gt;I did read the explanation of how MODE calculates the losses, but the result does not make sense to me, as the losses are super low compared to what I expected. (https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034396734-FDE-solver-analysis-Mode-List-and-Deck)&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Thank you,&lt;\/p&gt;&lt;p&gt;Leroy&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/04-12-2024-1733296956-mceclip0.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-396203","topic","type-topic","status-publish","hentry","topic-tag-eigensolver-analysis-2","topic-tag-FDE-1","topic-tag-losses"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27833"],"_bbp_topic_id":["396203"],"_bbp_subscription":["476356","33648"],"_bbp_author_ip":["2a02:14f:17a:8d3d:4805:400a:8eea:4e23"],"_bbp_last_reply_id":["397005"],"_bbp_last_active_id":["397005"],"_bbp_last_active_time":["2024-12-10 22:57:06"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["476356","33648"],"_btv_view_count":["472"],"_bbp_topic_status":["unanswered"],"_bbp_likes_count":["1"]},"test":"leroy-dokcampus-technion-ac-il"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/396203","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/396203\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=396203"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}