{"id":168958,"date":"2022-04-28T05:55:55","date_gmt":"2022-04-28T05:55:55","guid":{"rendered":"\/forum\/forums\/topic\/please-help-few-doubts-in-waveguide-simulation-using-fde-solver\/"},"modified":"2022-04-29T15:06:15","modified_gmt":"2022-04-29T15:06:15","slug":"please-help-few-doubts-in-waveguide-simulation-using-fde-solver","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/please-help-few-doubts-in-waveguide-simulation-using-fde-solver\/","title":{"rendered":"[Please help] Few doubts in waveguide simulation using FDE solver?"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Doubt regarding LNOI waveguide: I am trying to simulate LNOI waveguide ( lithium niobate waveguide on SiO2). During simulation I found that as I increase the core size (0.5um to 0.9um) Neff increases. In commercial available LNOI, LN thickness vary from 500nm to 900nm. Now anyone would choose core size 0.9um because its giving higher Neff, then what is the point of having LNOIs with LN thickness vary from 500nm to 900nm? <\/p>\n<p>Doubts regarding Mode: How do I find TE mode(for which I want to design waveguide)?Is it mode 2 in simulation, with TE polarization fraction 99?<\/p>\n<p>Regarding Boundary condition: In attached screenshot I have chosen metal boundary. Should I choose PML instead? <\/p>\n<p>Thanks for reading. An screenshot of simulation is attached for reference.<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/909\/1SGPVZM6YICY.jpg\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/909\/1SGPVZM6YICY.jpg\" alt=\"Capture.JPG\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-168958","topic","type-topic","status-closed","hentry","topic-tag-device-lumerical-error9002-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["529"],"_bbp_likes_count":["0"],"_bbp_subscription":["24751"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["168958"],"_bbp_forum_id":["27833"],"_bbp_engagement":["2592","24751"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["213299"],"_bbp_last_active_id":["213299"],"_bbp_last_active_time":["2022-04-29 15:06:15"]},"test":"ambarsac-isro-gov-in"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/168958","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\/168958\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=168958"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}