What source bandwidth should I use for my simulation?

Date	Category
2023-12-04 18:52:21	Sources

Tidy3D’s broadband source feature is designed to produce the most accurate results in the frequency range of (freq0 - 1.5 * fwidth, freq0 + 1.5 * fwidth). Therefore, it is necessary to define the source center frequency freq0 and bandwidth fwidth to properly cover the desired application frequency range. For example, if the user wants to adjust the source bandwidth to cover a wavelength range between wl_min and wl_max, the source bandwidth can be defined as: fwidth = alpha * (C_0/wl_max - C_0/wl_min), where alpha is a constant typically chosen between 1/3 and 1/2 to ensure accurate results.