Learning Forum

[1155206734]

1. When simulating the waveguide cross section in Mode, sometimes it shows TE Polarization Fraction (Ex), sometimes it shows TE Polarization Fraction (Ey),
is this principal component defined by the user or automatically defined by the software? What is the basis of the definition?

 

2. '"To know whether it is TE mode or TM mode, you need to check the principal component (i.e., the component with the largest amplitude) of its electric field, provided, of course, that the coordinate system is the same. There are some special waveguides that may have the largest component in the direction of propagation, but they can't be named after it because we are talking about the component perpendicular to the direction of propagation, i.e. the transverse component.” -------- from the forum

So a TE Polarization Fraction greater than 50% on the principal component is considered a TE-like mode?

How do TM modes look like? Less than 50%?Shouldn't the TM mode be studied by watching the magnetic field?

3. Check out TE/M fraction on Lumerical Knowledge Base. The waveguide TE/M fraction indicates the amount of E/H field in the direction of propagation. It is equal to the integrated transverse field intensity divided by the integrated total field intensity. A mode with a waveguide TE fraction of 100% is a pure TE mode. Similarly, a mode with a waveguide TM fraction of 100% is a pure TM mode, and a mode with a waveguide TE/M fraction of 100%/100% is a TEM mode”----------------- from the software mouse hover question mark tip

“It is equal to the integrated transverse field intensity divided by the integrated total field intensity.” However, https://optics.ansys.com/hc/en-us/articles/360034396734-FDE-solver-analysis-Mode-List-and-Deck  says that “The waveguide TE/TM fraction indicates the amount of E/H field in the direction of propagation”.
Is that a contradiction?

"A mode with a waveguide TE fraction of 100% is a pure TE mode." Shouldn't a pure TE mode have zero electric field strength in the direction of propagation?

 

[Dev]

Hello, the response has been provided in a duplicate post. https://innovationspace.ansys.com/forum/forums/topic/liyongte-polarization-fractionpanduantetmhewaveguide-tetm-fractiongainianlijie/

Thanks