{"id":344254,"date":"2024-01-11T13:28:44","date_gmt":"2024-01-11T13:28:44","guid":{"rendered":"\/forum\/forums\/topic\/edge-coupler-design-help-2\/"},"modified":"2024-01-11T13:28:44","modified_gmt":"2024-01-11T13:28:44","slug":"edge-coupler-design-help-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/edge-coupler-design-help-2\/","title":{"rendered":"Edge Coupler Design Help"},"content":{"rendered":"<p>Hello,<\/p>\n<p>I am working on an edge coupler design where on the facet I have Si substrate + cladding + waveguide + cladding + air and I want to optimize the mode overlap with a fiber that has a large core size, i.e. large mode field diameter. The problem is that I need to make the FDE region quite large to capture fiber modes accurately, but doing so makes it inevitable to include the Si substrate in the simulation region which results in light getting trapped inside the Si substrate, giving me useless simulation results. I am looking for a way to work around this problem so that I can capture the modes in my facet and fiber at the same time accurately with light confined in the waveguide and not in the substrate. Is there a way to confine the light into the waveguide without removing the Si subrate or using the cladding everywhere inside the simulation region?&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Thanks in advance.<\/p>\n","protected":false},"template":"","class_list":["post-344254","topic","type-topic","status-closed","hentry","topic-tag-FDE-1","topic-tag-lumerical"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["290152","33648"],"_bbp_author_ip":["168.143.243.14"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["251"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["344254"],"_bbp_forum_id":["27833"],"_bbp_engagement":["33648","290152"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["344317"],"_bbp_last_active_id":["344317"],"_bbp_last_active_time":["2024-01-11 18:05:37"]},"test":"bartu-yamanhhi-fraunhofer-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/344254","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\/344254\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=344254"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}