Question

Rotation of non-symmetrical ZBF

  • 7 September 2021
  • 3 replies
  • 36 views

Dear all,

I have a ZBF which is rotational non-symmetric. After I propagate the mode profile through my rotational non-symmetric system, I couple into a single mode fiber. Now, I want to examine how the coupling efficiency changes due to a rotation of the Input-ZBF (simulated data of a waveguide). 

I tried adding a Coordinate Break after the Start-Surface, but nothing happens when I change the Tilt about Z on the CB. I guess it has something to do with the rotation matrix, but there must be a way how I can analyze this tolerance. 

Thank you in advance.

Kind regards

Katrin


3 replies

Userlevel 4
Badge +1

Hi Katrin

The ZBF input beam will be centered and perpendicular to the chief ray (at the defined field and wavelength). So a coordinate break won’t affect that definition.

To test the effect of a rotation of the input ZBF, I think the easier would be to define a new field (that would correspond to a Z rotation) and set this field as the reference in POP.

Let us know how it goes.

Sandrine

Hello Sandrine,

I tried to use the field definition to rotate my input ZBF. Am I correct that I have to adjust the rotation of the tangetial plane by using “TAN” in the field editor? When I do that, I unfortunatley do not have any effect on the POP results. 

Kind regards

Katrin

Userlevel 4
Badge +1

Hi Katrin

Sorry for the late reply. I have removed the “Best Answer” tick because otherwise we don’t get notified.

To adjust the rotation, I would simply use the X and Y field coordinates, so for example if you have a field at X=0mm, Y=10mm, I would create a new field X=7.07mm and Y=7.07mm to make a rotation.

Would that work for you?

Sandrine

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