Guilin Sun
Ansys Employee
You could simulate without the waveguide core and then compare the result, which in this case it should be no side lobes. Your Fourier transform shows the beam has larger spatial frequencies and not Gaussian-like distribution. As you know, the Fourier transform of the Gaussian function is also a Gaussian. so another possibility is that the source span is smaller: the geometric area should be much larger than the beam waist.
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