[Amine AbouzaidParticipant]

Hi Soibam,

By default, the transmission curves show codirectional coupling, while contradirectional coupling will be shown in the reflection curves.

If you’re only seeing codirectional coupling, it’s probably because the default grating period is set to that of long-period grating, which only couples codirectionally. If you want contradirectional coupling, you need to change the grating period to that of a short-period grating.

To test this, you can select a shorter default grating period by opening the Grating Manager dialog box, double clicking on the grating, and selecting a shorter period under the Period parameter in the Grating Definition dialog box.

Amine

[Ahmad Atieh]

Hi Sebastian,

There is no option for defining an elliptical cross section directly in OptiGrating. If you’re interested in simulating gratings in fibers with elliptical cross sections, one option would be to use OptiGrating’s “Other Waveguide” module. This requires you to provide the mode parameters, which you could evaluate using some other software, like OptiMode.

If adding an azimuthal dependence to the index modulation is sufficient for your purposes, you can do so in OptiGrating using the “azimuthal photosensitivity” parameter in the “Single Fiber Profile” menu. The azimuthal photosensitivity acts as an envelope function for the index modulation, and can be set as a user-provided function.

If you have questions about either of these options, please don’t hesitate to contact me directly at amine.abouzaid@optiwave.com

Amine

• This reply was modified 5 months, 1 week ago by Ahmad Atieh.
• This reply was modified 5 months, 1 week ago by Ahmad Atieh.