{"id":160832,"date":"2021-07-30T03:33:50","date_gmt":"2021-07-30T03:33:50","guid":{"rendered":"\/forum\/forums\/topic\/incorrect-index-values-in-mode-or-port-sources\/"},"modified":"2021-07-30T15:43:45","modified_gmt":"2021-07-30T15:43:45","slug":"incorrect-index-values-in-mode-or-port-sources","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/incorrect-index-values-in-mode-or-port-sources\/","title":{"rendered":"Incorrect index values in Mode or Port sources"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hello,<\/p>\n<p>For a mode or port source, when I click the &quot;Visualize Data&quot; to check the selected mode and index profile, I find the index values are incorrect. For example in the grating coupler example (<a href=\"https:\/\/support.lumerical.com\/hc\/en-us\/articles\/360042305334-Grating-coupler\" rel=\"nofollow\">https:\/\/support.lumerical.com\/hc\/en-us\/articles\/360042305334-Grating-coupler<\/a>). In the &#039;grating_coupler_2D.fsp&#039; file, if we visualize the selected mode of port 2, we can get the index and mode profile as shown in the following figure. The index value of waveguide core (Silicon ) is ~6 here, which is abvously incorrect. The right index value is around ~3-4. Can you explain why this happens or whether my understanding is wrong? Looking forward to your reply. Thank you.<\/p>\n<p><\/p>\n<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/229\/VBVH0ZNVCBO7.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/229\/VBVH0ZNVCBO7.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-160832","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_view_count":["236"],"_bbp_likes_count":["0","0"],"_bbp_forum_subforum_count":["0"],"_btv_view_count":["297"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["160832"],"_bbp_forum_id":["27833"],"_bbp_engagement":["14496","215389"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["187144"],"_bbp_last_active_id":["187144"],"_bbp_last_active_time":["2021-07-30 15:43:45"]},"test":"xiaoleig-clemson-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/160832","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\/160832\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=160832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}