{"id":394137,"date":"2024-11-15T23:18:08","date_gmt":"2024-11-15T23:18:08","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394137\/"},"modified":"2024-11-15T23:18:08","modified_gmt":"2024-11-15T23:18:08","slug":"394137","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394137\/","title":{"rendered":"Reply To: To simulate with a rectangular single pulse input on Lumerical FDTD"},"content":{"rendered":"<p>&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Hello Subscriber,&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;In general, a rectangular-shaped pulse can be defined in the time domain, frequency domain, spatial domain, or spatial frequency domain. The choice of how to set up the simulation is always up to the user.&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Based on the context of your problem, I believe that defining the signal in the time domain is the most relevant approach. Please refer to the article <a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034383114-Creating-a-custom-source-time-signal-for-an-FDTD-source\" target=\"_blank\" rel=\"noopener\">Creating a custom source time signal for an FDTD source<\/a>, which provides an example of how to set a user-defined time profile for the signal.&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Please note that simulating an exact rectangular pulse signal in the time domain using FDTD can present challenges due to the sharp edges of the time profile. I recommend starting your simulation with a standard pulse and then modifying it to evaluate the impact of a rectangular signal shape.&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Additionally, you could potentially estimate the system&#8217;s time-domain response to a rectangular time signal using the convolution technique. For more details, refer to to&nbsp;<a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034915813-Impulse-Analysis-Calculating-the-response-to-an-arbitrary-time-signal-using-the-impulse-response\" target=\"_blank\" rel=\"noopener\">Impulse Analysis &#8211; Calculating the response to an arbitrary time signal using the impulse response<\/a>.&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Best regards,&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Kirill&lt;\/span&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-394137","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=\"Hello Subscriber,In general, a rectangular-shaped pulse can be defined in the time domain, frequency domain, spatial domain, or spatial frequency domain. 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