{"id":390764,"date":"2024-10-22T03:24:30","date_gmt":"2024-10-22T03:24:30","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390764\/"},"modified":"2024-10-22T03:24:30","modified_gmt":"2024-10-22T03:24:30","slug":"390764","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390764\/","title":{"rendered":"Reply To: Designing a single mode fiber"},"content":{"rendered":"<p>&lt;p&gt;Thank you Guilin Sun for your reply. What I have done so far is I found a Lumerical page https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360043165394-Fibers-List-of-Examples that has fiber files to use and I downloaded the step index FDE file since technically my single mode fiber is a step index fiber. I attached my pics of my single mode fiber design and the calculations I used to design the geometry of the waveguide. The calculations for the radius of the core gave me a radius of .7659 um. I made the cladding radius 10 times the core radius so cladding radius is 7.659 um. The FDE I designed to have an x span and a y span of 38 um each. After calculating the modes I get two modes. I cannot seem to design to generate one mode only. I also included plots of my two modes. Can someone please let me know how I can tweak my design to get only one mode? Any advice is welcome.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/22-10-2024-1729566629-wow1.PNG\" alt=\"\" width=\"397\" height=\"423\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/22-10-2024-1729567413-wow2.PNG\" alt=\"\" width=\"641\" height=\"304\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-390764","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Thank you Guilin Sun for your reply. What I have done so far is I found a Lumerical page https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360043165394-Fibers-List-of-Examples that has fiber files to use and I downloaded the step index FDE file since technically my single mode fiber is a step index fiber. I attached my pics of my single mode fiber design\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390764\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Designing a single mode fiber | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Thank you Guilin Sun for your reply. What I have done so far is I found a Lumerical page https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360043165394-Fibers-List-of-Examples that has fiber files to use and I downloaded the step index FDE file since technically my single mode fiber is a step index fiber. I attached my pics of my single mode fiber design\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390764\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/22-10-2024-1729566629-wow1.PNG\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/22-10-2024-1729566629-wow1.PNG\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-22T03:24:30+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-10-22T03:24:30+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Designing a single mode fiber | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Thank you Guilin Sun for your reply. What I have done so far is I found a Lumerical page https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360043165394-Fibers-List-of-Examples that has fiber files to use and I downloaded the step index FDE file since technically my single mode fiber is a step index fiber. I attached my pics of my single mode fiber design\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/22-10-2024-1729566629-wow1.PNG\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/390764\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/390764\\\/#listItem\",\"name\":\"Reply To: Designing a single mode fiber\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/390764\\\/#listItem\",\"position\":2,\"name\":\"Reply To: Designing a single mode fiber\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/390764\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/390764\\\/\",\"name\":\"Reply To: Designing a single mode fiber | Ansys Learning Forum\",\"description\":\"Thank you Guilin Sun for your reply. What I have done so far is I found a Lumerical page https:\\\/\\\/optics.ansys.com\\\/hc\\\/en-us\\\/articles\\\/360043165394-Fibers-List-of-Examples that has fiber files to use and I downloaded the step index FDE file since technically my single mode fiber is a step index fiber. 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What I have done so far is I found a Lumerical page https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360043165394-Fibers-List-of-Examples that has fiber files to use and I downloaded the step index FDE file since technically my single mode fiber is a step index fiber. 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What I have done so far is I found a Lumerical page https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360043165394-Fibers-List-of-Examples that has fiber files to use and I downloaded the step index FDE file since technically my single mode fiber is a step index fiber. 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What I have done so far is I found a Lumerical page https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360043165394-Fibers-List-of-Examples that has fiber files to use and I downloaded the step index FDE file since technically my single mode fiber is a step index fiber. I attached my pics of my single mode fiber design","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390764\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/22-10-2024-1729566629-wow1.PNG","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/22-10-2024-1729566629-wow1.PNG","article:published_time":"2024-10-22T03:24:30+00:00","article:modified_time":"2024-10-22T03:24:30+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: Designing a single mode fiber | Ansys Learning Forum","twitter:description":"Thank you Guilin Sun for your reply. 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