{"id":429857,"date":"2025-04-24T05:59:06","date_gmt":"2025-04-24T05:59:06","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/quality-factor-from-interconnect-ona\/"},"modified":"2025-04-24T05:59:06","modified_gmt":"2025-04-24T05:59:06","slug":"quality-factor-from-interconnect-ona","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/quality-factor-from-interconnect-ona\/","title":{"rendered":"Quality factor from Interconnect ONA"},"content":{"rendered":"<p>&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Hello,&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;I am confused on how INTC&#8217;s ONA element calculates Q-factors. I have created an add-drop ring resonator (heavily inspired by <a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360042322794-Ring-Modulator\">this example<\/a>) that I want to extract the Q-factor of. I understand that Q = f0\/f_FWHM, and that the spectral response follows a Lorentzian. I&#8217;ve extracted the spectral data from the ONA and externally fit the Lorentzian parameters to calculate Q, resulting in an excellent fit. However, this Q-factor does not match the Q-factor that INTC spits out. Additionally, the Q-factor from INTC changes depending on the FWHM excursion that is set, however the spectral data does not change. &nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Is there a formula, algorithm, or fitting routine used by the ONA to obtain the Q-factor for a set of collected spectral data? If so, is this publicly available, and if not, how can I replicate the Q-factor that is returned?&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;In case this matters, I am using both an excess loss and the frequency-dependent propagation loss from my FDE simulations. I can confirm that changing the excess loss changes the spectral response, and thus the Q-factor.&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Any and all insight would be greatly appreciated. Thank you for your time and help, and I look forward to your reply!&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;-AD&lt;\/span&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-429857","topic","type-topic","status-publish","hentry","topic-tag-bendingloss-1","topic-tag-FDE-1","topic-tag-fdtd","topic-tag-interconnect","topic-tag-linewidth-1","topic-tag-ringresonators-1","topic-tag-wave-propagation","topic-tag-waveguide-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27833"],"_bbp_topic_id":["429857"],"_bbp_subscription":["480237","18532"],"_bbp_author_ip":["165.124.167.4"],"_bbp_last_reply_id":["431592"],"_bbp_last_active_id":["431592"],"_bbp_last_active_time":["2025-05-14 10:18:13"],"_bbp_reply_count":["10"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["480237","18532"],"_btv_view_count":["444"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["473055"]},"test":"adevatau-northwestern-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/429857","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\/429857\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=429857"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}