{"id":434636,"date":"2025-06-18T11:14:43","date_gmt":"2025-06-18T11:14:43","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issue-with-resolution-of-sideband-frequency-shift-in-osa-in-interconnect\/"},"modified":"2025-06-18T11:14:43","modified_gmt":"2025-06-18T11:14:43","slug":"issue-with-resolution-of-sideband-frequency-shift-in-osa-in-interconnect","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issue-with-resolution-of-sideband-frequency-shift-in-osa-in-interconnect\/","title":{"rendered":"Issue with Resolution of Sideband Frequency Shift in OSA in INTERCONNECT"},"content":{"rendered":"

<p style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”><span style=”font-size: 12pt; font-family: ‘Times New Roman’; color: black;”>Hi everyone,<\/span><\/p><p style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”> <\/p><p style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”><span style=”font-size: 12pt;”><span style=”font-family: ‘Times New Roman’; color: black;”>I am currently working <\/span><span style=”font-family: ‘Times New Roman’; color: black;”>on a modulation design in <\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>Lumerical<\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”> INTERCONNECT<\/span><span style=”font-family: ‘Times New Roman’; color: black;”> where we aim to monitor the frequency shift in optical sidebands using the <\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>Optical Spectrum Analyzer (OSA)<\/span><span style=”font-family: ‘Times New Roman’; color: black;”>. However, <\/span><span style=”font-family: ‘Times New Roman’; color: black;”>I am currently <\/span><span style=”font-family: ‘Times New Roman’; color: black;”>facing challenges in accurately resolving these sidebands.<\/span><\/span><\/p><p style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”> <\/p><p style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”><span style=”font-size: 12pt;”><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>Problem <\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>Description:<\/span><\/span><\/p><div style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”><span style=”font-size: 12pt;”><span style=”mso-special-format: bullet; font-family: Arial;”>•<\/span><span style=”font-family: ‘Times New Roman’; color: black;”> I am using <\/span><span style=”font-family: ‘Times New Roman’; color: black;”>a continuous wave laser source set at a central frequency of <\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>193.5\u202fTHz<\/span><span style=”font-family: ‘Times New Roman’; color: black;”>.<\/span><\/span><\/div><div style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”><span style=”font-size: 12pt;”><span style=”mso-special-format: bullet; font-family: Arial;”>•<\/span><span style=”font-family: ‘Times New Roman’; color: black;”> When <\/span><span style=”font-family: ‘Times New Roman’; color: black;”>applying a sine wave of <\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>2.3\u202fGHz<\/span><span style=”font-family: ‘Times New Roman’; color: black;”>, the expected sideband should appear at <\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>193.5023\u202fTHz<\/span><span style=”font-family: ‘Times New Roman’; color: black;”>, but the OSA shows it only at <\/span><span style=”font-family: ‘Times New Roman’; color: black;”><span style=”mso-spacerun: yes;”>  <\/span><\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>193.502\u202fTHz<\/span><span style=”font-family: ‘Times New Roman’; color: black;”>.<\/span><\/span><\/div><div style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”><span style=”font-size: 12pt;”><span style=”mso-special-format: bullet; font-family: Arial;”>•<\/span><span style=”font-family: ‘Times New Roman’; color: black;”> Increasing <\/span><span style=”font-family: ‘Times New Roman’; color: black;”>the RF signal to <\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>2.31\u202fGHz<\/span><span style=”font-family: ‘Times New Roman’; color: black;”> still results in the sideband being displayed at <\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>193.502\u202fTHz<\/span><span style=”font-family: ‘Times New Roman’; color: black;”>, whereas it should be at <\/span><span style=”font-family: ‘Times New Roman’; color: black;”><span style=”mso-spacerun: yes;”> <\/span><\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>193.50231\u202fTHz<\/span><span style=”font-family: ‘Times New Roman’; color: black;”>.<\/span><\/span><\/div><div style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”><span style=”font-size: 12pt;”><span style=”mso-special-format: bullet; font-family: Arial;”>•<\/span><span style=”font-family: ‘Times New Roman’; color: black;”> Interestingly<\/span><span style=”font-family: ‘Times New Roman’; color: black;”>, when I set the laser frequency to <\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>1\u202fTHz or <\/span><span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>lower optical frequency<\/span><span style=”font-family: ‘Times New Roman’; color: black;”>, <\/span><span style=”font-family: ‘Times New Roman’; color: black;”>the sidebands are generated and resolved correctly in the OSA.<\/span><\/span><\/div><div style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”> <\/div><div style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”><div style=”margin-top: 0pt; margin-bottom: 0pt; margin-left: 0.31in; text-indent: -0.31in; direction: ltr; unicode-bidi: embed; word-break: normal; text-align: justify;”><span style=”font-size: 12pt;”><span style=”font-family: ‘Times New Roman’; color: black;”>       So, I am currently not able to see the shift in sidebands in with accuracy and precision, when the Laser central frequency is set at high optical frequency of 193.5 THz. <span style=”font-size: 16.0pt; font-family: ‘Times New Roman’; mso-ascii-font-family: ‘Times New Roman’; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: ‘Times New Roman’; mso-fareast-theme-font: minor-fareast; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-GB; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;”><span style=”font-size: 12pt;”>I have tried increasing the number of samples in the simulation <span style=”font-size: 12pt;”><span style=”font-size: 16.0pt; font-family: ‘Times New Roman’; mso-ascii-font-family: ‘Times New Roman’; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: ‘Times New Roman’; mso-fareast-theme-font: minor-fareast; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-GB; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;”><span style=”font-size: 12pt;”>by increasing sampling rate, but still same issue<\/span>. <\/span>Could you please advise on the appropriate <span style=”font-family: ‘Times New Roman’; color: black; font-weight: bold;”>simulation parameters<\/span> or any other methods required to achieve higher resolution and accuracy in sideband analysis. <\/span><\/span><\/span><\/span><\/span><\/div><\/div><div style=”language: en-IN; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;”><span style=”font-size: 16.0pt; font-family: ‘Times New Roman’; mso-ascii-font-family: ‘Times New Roman’; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: ‘Times New Roman’; mso-fareast-theme-font: minor-fareast; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-GB; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;”>\"\"\"\"<\/span><\/div><\/p>\n","protected":false},"template":"","class_list":["post-434636","topic","type-topic","status-publish","hentry","topic-tag-interconnect"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27833"],"_bbp_topic_id":["434636"],"_bbp_subscription":["563632","4274"],"_bbp_author_ip":["14.139.223.164"],"_bbp_last_reply_id":["434714"],"_bbp_last_active_id":["434714"],"_bbp_last_active_time":["2025-06-18 19:57:54"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["563632","4274"],"_btv_view_count":["126"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["473055"]},"test":"roysaurav-jugmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/434636","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\/434636\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=434636"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}