• SiN/SiO - based waveguide structure with a surface - relief grating
• 200 periods
• Cosine-shaped chirp: p = 0.44...0.47 µm
• Addition of local stop-bands!

VMM model:

• 100k unknowns, occupies ~500 MB RAM
• Execution time: ~40 sec / wavelength-point on a computer with a 2.4 GHz CPU
• Our VMM - model ist able to describe effects like:

  • directional behavior;
  • insertion losses due to field-mismatch at the grating interfaces;
  • parasitic Fabry-Perot resonances

  which cannot be simulated by simple 1D effective index models ignoring radiation effects

Here are some samples. Please click to see propagation of optical fields at stated wavelength:

1430 nm
1468 nm
1489 nm
1516 nm
1537 nm
1559 nm
1600 nm