Transmission and cross coupling coefficient (tau and kappa) Lumerical MODE

- July 8, 2022 at 5:36 am
  
  Catherine.antipuesto
  Subscriber
  
  Good day!
  I would just like to ask how I can obtain the tranmission and cross coupling coeffecient of a microring resonator using Lumerical Script in Microring resonator. Furthermore, these coeffecients vary in wavelengths. How can I get this plot?
  Thank you!
- July 8, 2022 at 9:09 am
  
  jackzhf
  Subscriber
  
  https://optics.ansys.com/hc/en-us/articles/360042800293
  
  This page contains a package of LSF codes and MODE and FDTD project files that you can use to extract tau and kappa in terms of wavelength. Hope that it will help. Good day.
- July 8, 2022 at 11:38 pm
  
  Guilin Sun
  Ansys Employee
  
  @jackzhf thank you for help!
  Please note that, kappa and tao are complex numbers so in the FDTD simulation, it could change their phases depending on the port locations. The power coupling coefficient can be simulated without ambiguity, such as the online example.
- July 10, 2022 at 10:48 am
  
  Catherine.antipuesto
  Subscriber
  
  Hello Thank you for your replies. I have read the article that you mentioned however, I was not able to find exactly, how I can graph the coeffecients kappa and tau. Can I please ask for your guidance? Thank you!
- July 10, 2022 at 8:09 pm
  
  jackzhf
  Subscriber
  
  Did you try the files and check the codes in the LSF files on the page?
  
  https://optics.ansys.com/hc/article_attachments/360057321293/gs_ring_labels.png
  Tips: keep an eye of t11 and t12
  
  Associated files
  fdtd_results.ldf
  ring_resonator.lms
  ring_resonator_fdtd.lsf
  https://optics.ansys.com/hc/en-us/article_attachments/360056406794/ring_resonator_fdtd.lsf
  ring_resonator.fsp
  ring_resonator.lsf
  https://optics.ansys.com/hc/en-us/article_attachments/360057295953/ring_resonator.lsf
  
  plot - Script command
  https://optics.ansys.com/hc/en-us/articles/360034410474-plot-Script-command
- July 11, 2022 at 8:16 am
  
  Catherine.antipuesto
  Subscriber
  
  Yes I already checked it but the calculation of tau is only theoretical and depends only on the Q and FSR values typed in the script. I was wondering if there is a way to get the tau of the designed microring resonator in Lumerical Mode by using obtaining the data from the monitors.
  Thank you!
  - July 11, 2022 at 9:10 am
    
    jackzhf
    Subscriber
    
    Step 1 in the following example should fit your purpose using FDTD solver and hope it will help.
    
    https://optics.ansys.com/hc/en-us/articles/360042322794-Ring-Modulator

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