Hello Sahil Singh,
Undoubtedly Double-clad fiber technology is indeed a very important technology in the area of active fiber optics as very well mentioned by other forum members. But as far as design is concerned , i agree with fayiqa naqshbandi and aasif bashir that you need to use all together a different tool for your requirement which is Opti-Fiber. Can you tell us what exactly are you using these fibers for for your system design..?
It would help us to understand the implications of these fibers.
Regards