Hello,
Thanks for reaching out to us.
To cater your application, I suggest you to look into the example of ‘FBG fiber loop mirror’. You can find this example at location: C:\Users\USERNAME\Documents\OptiSystem 22.0 Samples\Sensor systems\FBG Sensor\FBG fiber loop mirror.osd
It shows how to setup the feedback loop and also implement the FBG sensor in the circuit. You can set the parameters for the FBG as per your requirement.
Also, make sure to set enough number of iterations in the Signals window while setting up the simulation parameters on the canvas, for the simulation to converge.
I hope this helps?
Let me know if you have any further questions.
Warm Regards,
Saurabh Bedi.