{"id":282056,"date":"2023-05-02T20:15:20","date_gmt":"2023-05-02T20:15:20","guid":{"rendered":"\/forum\/forums\/topic\/transmission-results-greater-than-one-in-a-single-bus-ring-resonator-varfdtd\/"},"modified":"2023-05-02T20:15:20","modified_gmt":"2023-05-02T20:15:20","slug":"transmission-results-greater-than-one-in-a-single-bus-ring-resonator-varfdtd","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/transmission-results-greater-than-one-in-a-single-bus-ring-resonator-varfdtd\/","title":{"rendered":"Transmission results greater than one in a Single Bus ring resonator &#8212; varFDTD"},"content":{"rendered":"<p class=\"MsoNormal\">Dear Ansys Forum,<\/p>\n<p class=\"MsoNormal\">I am using the example of a <strong>double bus ring resonator<\/strong> (ring_resonator2.lms) provided by Ansys <a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360042800233\">https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360042800233<\/a> <span>&nbsp;<\/span>as an initial step to simulate a <strong>single bus ring resonator.<\/strong><\/p>\n<p class=\"MsoNormal\">Here is the transmission from the double bus ring resonator:<\/p>\n<p class=\"MsoNormal\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/05\/02-05-2023-1683057798-Picture1.png\" alt=\"\" width=\"893\" height=\"372\"><\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n<p class=\"MsoNormal\">However, using the same simulation file Ansys provided, I removed the drop waveguide to make a single bus ring resonator, as shown below. The transmission result at the through port consistently exceeds one.<\/p>\n<p class=\"MsoNormal\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/05\/02-05-2023-1683057936-Picture2.png\" alt=\"\" width=\"906\" height=\"400\"><\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n<p class=\"MsoNormal\">I implemented all the solutions given in the post &ldquo;Transmission Results Greater Than One&rdquo; <a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/12614264530323\">https:\/\/optics.ansys.com\/hc\/en-us\/articles\/12614264530323<\/a> , but I could not resolve this issue.<\/p>\n<p class=\"MsoNormal\">Additionally, all the suggestions given in previous posts <a href=\"\/forum\/forums\/topic\/ring-resonatorabout-my-transmission-more-than-1\/\">\/forum\/forums\/topic\/ring-resonatorabout-my-transmission-more-than-1\/<\/a> , such as increasing the simulation time and reducing the auto shutoff, could not still solve the problem. I noted that varFDTD only gave me reliable transmission for the double bus ring resonator.<\/p>\n<p class=\"MsoNormal\">Is there any reason for the transmission to exceed one in a single bus ring resonator? And why more ripples in the transmission spectrum?<\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n<p class=\"MsoNormal\">Thanks for your help!<\/p>\n","protected":false},"template":"","class_list":["post-282056","topic","type-topic","status-closed","hentry","topic-tag-mode-varfdtd-2","topic-tag-ringresonators-1","topic-tag-transmission-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["256061","283938","2592","284978"],"_bbp_author_ip":["23.220.96.181"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["726"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["282056"],"_bbp_forum_id":["27833"],"_bbp_engagement":["2592","256061","283938","284978"],"_bbp_voice_count":["4"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["284116"],"_bbp_last_active_id":["284116"],"_bbp_last_active_time":["2023-05-16 03:11:40"]},"test":"daniel-pimbittu-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/282056","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\/282056\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=282056"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}