{"id":365835,"date":"2024-05-07T11:26:28","date_gmt":"2024-05-07T11:26:28","guid":{"rendered":"\/forum\/forums\/reply\/365835\/"},"modified":"2024-05-07T11:26:28","modified_gmt":"2024-05-07T11:26:28","slug":"365835","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/365835\/","title":{"rendered":"Reply To: Loss vs. waveguide bend radius in Lumerical FEEM"},"content":{"rendered":"<p>&lt;p&gt;The structure simulated is a silicon rib waveguide. The mode 1 field (for straight waveguide) is shown along with the structure.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/07-05-2024-1715080450-straight.PNG\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;Bend waveguide simulation for a bent radius of 20 um is done. The field obtained is as below (for mode 1).&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/07-05-2024-1715080529-20 um bend_mode1.png\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;The substrate and slab x-span and z-span are taken as 40,000 um. The waveguide length is 40,000 um and is centered at x=0. The bend simulation region span was changed to xmin=-10 um to xmax= 36 um. Apart from xmin, remaining has a shell boundary condition, with shel thickess of 1 um. Bend location in FEEM is fixed as (0,0,0). Edges per wavelength = 5, and polynomial order = 4. No. of modes chosen are 2. Auto remove pml modes has been activated.&lt;\/p&gt;&lt;p&gt;The bend radius is swept from 12,000 to 18,000 um. Both &#8220;mode properties&#8221; and &#8220;fields&#8221; are monitored.&nbsp;&lt;\/p&gt;&lt;p&gt;1) One issue is the warning which says the fields returned are of different sizes.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/07-05-2024-1715080695-fields are of different sizes.PNG\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;2) The loss vs. bend radius plot obtained is shown below. I expect a gradual decrease in loss with increase in radius, which is not the case here.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/07-05-2024-1715080824-loss_12 to 18 mm_mode1.png\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;3) The system used is of 64 GB RAM. I had monitored the memory usage during the simulation. Attached is the screenshot at an instance.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/07-05-2024-1715080852-memory usage.PNG\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;Please suggest what might be wrong here.&lt;\/p&gt;&lt;p&gt;Thank you.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-365835","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=\"The structure simulated is a silicon rib waveguide. The mode 1 field (for straight waveguide) is shown along with the structure.Bend waveguide simulation for a bent radius of 20 um is done. The field obtained is as below (for mode 1).The substrate and slab x-span and z-span are taken as 40,000 um. The waveguide length\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/365835\/\" \/>\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: Loss vs. waveguide bend radius in Lumerical FEEM | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"The structure simulated is a silicon rib waveguide. The mode 1 field (for straight waveguide) is shown along with the structure.Bend waveguide simulation for a bent radius of 20 um is done. The field obtained is as below (for mode 1).The substrate and slab x-span and z-span are taken as 40,000 um. The waveguide length\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/365835\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/07-05-2024-1715080450-straight.PNG\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/07-05-2024-1715080450-straight.PNG\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-05-07T11:26:28+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-05-07T11:26:28+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Loss vs. waveguide bend radius in Lumerical FEEM | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"The structure simulated is a silicon rib waveguide. The mode 1 field (for straight waveguide) is shown along with the structure.Bend waveguide simulation for a bent radius of 20 um is done. The field obtained is as below (for mode 1).The substrate and slab x-span and z-span are taken as 40,000 um. 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