Directional Coupler: how to calculate the coupling coefficients?

- May 17, 2024 at 8:38 am
  
  Monica Lam
  Subscriber
  
  I want to make a compact model of a directional coupler.
  How do I calculate the coupling coefficients to enter into the JSON template?
  I now have a simulation with an FDE solver.
- May 17, 2024 at 6:11 pm
  
  Guilin Sun
  Ansys Employee
  
  The coupling coefficient is simulated, or specified for INTERCONNECR use.
  If it is power coupling coefficient, you can simulate the power transmission with such settings:
  Or you may deduct it from this example: https://optics.ansys.com/hc/en-us/articles/360042800293-Ring-resonator-getting-started-Design-and-initial-simulation
  This example might be more helpful: https://optics.ansys.com/hc/en-us/articles/360042322794-Ring-Modulator
  - May 21, 2024 at 8:17 am
    
    Monica Lam
    Subscriber
    
    Thank you for your answer. I have an additional question.
    What is the (physical) meaning of k0 and kL as is written on this webpage?:
    https://optics.ansys.com/hc/en-us/articles/360034179494-directional-coupler-parameterized-CML-Compiler-Model