sorry i forgot to attach the link for the above post.So i am attaching the link for your reference.Hope it may help you.
https://www.rp-photonics.com/double_clad_fibers.html
Also for simulating double clad doped fibers in optiwave system, i agree with Aasif Bashir Dar and Fayiqa Naqshbandhi that you will require device level software of the optiwave namely optifiber. So you should first try to understand the basics of the software and try to implement your design in that software.
Hope it may help you.
with regards.