{"id":396473,"date":"2024-12-05T16:09:22","date_gmt":"2024-12-05T16:09:22","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/loss-of-lithium-niobate-phase-modulator\/"},"modified":"2024-12-05T16:09:22","modified_gmt":"2024-12-05T16:09:22","slug":"loss-of-lithium-niobate-phase-modulator","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/loss-of-lithium-niobate-phase-modulator\/","title":{"rendered":"Loss of lithium niobate phase modulator"},"content":{"rendered":"<p>&lt;p&gt;Hello,&lt;br&gt;I&#8217;m Alessandro and I&#8217;m currently working on thin-film lithium niobate electro-optic phase modulator.&lt;br&gt;Considering the&nbsp;<strong>example<\/strong>: &lt;br&gt;https:\/\/optics.ansys.com\/hc\/en-us\/articles\/19435937674387-Thin-Film-Lithium-Niobate-Electro-Optic-Phase-Modulator&lt;br&gt;&lt;br&gt;, I set the lithium niobate telecom permittivities of the CHARGE script to:&lt;br&gt;eps_o = 2.2111^2;&lt;br&gt;eps_e = 2.1376^2;&lt;br&gt;and I retrieved an optical loss of almost 10dB (slightly varying according to the applied voltage) for the TE00 mode.&lt;br&gt;&lt;br&gt;Then, I tried to unlock the mesh of FEEM and CHARGE and the loss was quite different (1.5 dB). Why did this value change so much?&lt;br&gt;&lt;br&gt;I read from another post (https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/various-charge-monitor-results-for-the-same-problem\/) that the mesh varies if it is not locked. However, this is quite a big change.&lt;br&gt;&lt;br&gt;Thank you in advance.&lt;br&gt;&lt;br&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-396473","topic","type-topic","status-publish","hentry","topic-tag-designmodulator-2","topic-tag-lithiumniobate-1","topic-tag-thin-film"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27833"],"_bbp_topic_id":["396473"],"_bbp_subscription":["472795","106247"],"_bbp_author_ip":["193.204.33.81"],"_bbp_last_reply_id":["408861"],"_bbp_last_active_id":["408861"],"_bbp_last_active_time":["2025-02-07 18:32:22"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["472795","106247"],"_btv_view_count":["818"],"_bbp_topic_status":["unanswered"]},"test":"alessandro-brugnoni01universitadipavia-it"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/396473","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\/396473\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=396473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}