{"id":159639,"date":"2021-06-19T11:17:00","date_gmt":"2021-06-19T11:17:00","guid":{"rendered":"\/forum\/forums\/topic\/reflections-due-to-source-input-port\/"},"modified":"2021-07-02T22:10:36","modified_gmt":"2021-07-02T22:10:36","slug":"reflections-due-to-source-input-port","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/reflections-due-to-source-input-port\/","title":{"rendered":"Reflections due to source \/ Input port"},"content":{"rendered":"
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Dear Lumerical Community,<\/p>\n

I am designing a device which is using grating coupler. The Frequency domain field profile monitor is present on the top to capture the light. I was getting good modes but with quite low transmission efficiency. I stretched the top monitor on whole device and after simulation I saw transmission much stronger than grating coupler from the source directly to the upper monitor. <\/p>\n

So, I reverted back and did simulation with just a simple waveguide having monitor on top in the air and also a monitor in the silicon substrate beneath. Here I also saw reflections, which I might have a guess, coming from the source. As ultimately I have to guide the light through the grating coupler, so I am very concerned about these reflections.<\/p>\n

Any suggestions would be really appreciated. I have also attached the photos for the reference.<\/p>\n

With Kind Regards<\/p>\n

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