Why the transmission (without any device) is different from the source profile?

fdtd

#1

I tried to figure out the spectrum of the source where there is no any device involved. I just used a monitor to collect the transmission, which I thought of the source profile. However, the collected transmission is quite different from the source profile. why?


#2

Does anyone knows why? i am interested to know why as well.


#3

Is there any staff who can help this?


#4

Hi @bob and @george_chen

Transmission normalized the results to sourcepower and thus returns a value of 1 in free space:
https://kb.lumerical.com/ref_scripts_transmission.html

You can obtain the “spectrum” and “time signal” by running the simulations, and then right clicking on the source and visualizing the property of interest.