Learning Forum

[suruchi.bala]

Hi,

I want to add bragg grating waveguide in Interconnect as shown in the photo (reference image is from one of the lumerical  videos). The options available in Interconnect doesn't show any bragg waveguide where period, number of periods etc can be added as shown in the image. How to add such grating waveguide?

 

 

[Guilin Sun]

Please add it from "Waveguides","Gratings", and enable the parameter display by ticking "anomate":

By default, it is the Bragging frequency:

you can change it to be "Bragg Period".

 

[suruchi.bala]

Hi Guilin,

Thank you for your help. I can see grating period but where can I add number of periods and corrugation width?

[Guilin Sun]

This is not physical model, but a math element. So it only needs whatever the specs required. Please check the Bragg graing element articles:

https://optics.ansys.com/hc/en-us/articles/360036108114-Bragg-Grating-WBG-INTERCONNECT-Element

https://optics.ansys.com/hc/en-us/articles/360036108134-Sampled-Bragg-Grating-WBG-INTERCONNECT-Element

 

 

 

[suruchi.bala]

Hi, 

This model shows number of periods, where can I add that?

[Guilin Sun]

It is from foundry CML that you need a special permission (license). The CML can have user-defined parameters. It is not in the standard elements. Please contact your account manager for more information.

https://optics.ansys.com/hc/en-us/articles/360037565953-CML-Compiler-product-reference-manual 

[suruchi.bala]

Hi Guilin,

I have checked the CML manual but couldn't find the same example. Do you mind sharing the link for the same example.

Thank you.

[Guilin Sun]

 

It is foundary dependent and you need to pick up the correct element from their library.  Since you have the license, please read the online instruction which is limited to access only for special licenses.

I think it is 

LCML – Waveguide Bragg grating | lcml_bragg_strip_1550

 

[suruchi.bala]

Hi Guilin,

I have a question regarding TE/TM mode in FDTD. I just want to undertstand and confirm, if we use plane wave source injected in xaxis with polarisation angle 0, does this mean its generating TE field?

Regards

Suruchi

[Guilin Sun]

This will depend on your definition of TE mode. There are contradictory definitions about TE/TM. I wrote a post in Chinese  https://innovationspace.ansys.com/forum/forums/topic/ansys-insight-youguantetmpianzhenyijimoshiguangyuandewenti/#post-176494  You can goolge translate it. or simply read the following:

https://optics.ansys.com/hc/en-us/articles/360034914633-Finite-Difference-Time-Domain-FDTD-solver-introduction  FDTD uses this definition  TE:   Ex, Ey, Hz

however in the stack example: https://optics.ansys.com/hc/en-us/articles/360034914653-STACK-Optical-Solver-Overview 

It is the opposit.

BTW: for new questions please write a new post.