In this Lumerical example it says 'In this example the sub-wavelength grating structure was not included. This is the exact same structure as in Lumerical's own edge coupler example: So it depends on several factors, and there is a trade off between simulation efficiency and accuracy. However if the device is larger and mesh is fine, FDTD may need long simulation time. For FDTD it can theoretically handle all types of tapers and can give broadband result. In addition, if you want very broadband result, or the mode dispersion is strong, EME may also need long simulation time. When the device angle is too large, EME will need more group cells, which leads to long simulation time. It does not mean EME or FDTD cannot simulate such device, it is the simulation efficiency and accuracy. If the taper cone angle is large, you may try varFDTD and 3D FDTD:Ĭurved waveguide taper (varFDTD and FDTD)Īs for how large the angle is large, it depends. Polarization converter using a tapered waveguide Thank you.ĭid you run 'emepropagate'? I tested and there is no any issue showing yz profile:įor common taper with small cone angle, EME is perfect to design and optimize, Here are some examples: I will then calculate the overlap between the taper mode and a fiber mode.

but only need an accurate mode profile at the narrow tip of the taper. lms file? I am using Lumerical through a university license.Īlso, what is the best approach (EME/varFDTD/FDTD?) if I want to simulate the output only of an adiabatic waveguide taper with sub-wavelength features? I am not optimizing the taper length, etc. lms files so I have attached a screenshot of the new YZ monitor settings. Will you please let me know what I am doing wrong here? This forum does not allow me to upload. I have added a new monitor (cross_section_mode_monitor) and disabled the existing one (Field_profile) accordingly, but when I run the simulation, no results are loading into the new monitor and I cannot visualize the YZ field.

Hi, I am following this linear taper example ( ) but I would like to add a mode field monitor to visualize the YZ mode (X-normal) instead of the XY mode (Z-normal).

Lumerical fdtd examples