Thank you so much Damian. I have attached the project I am working on and I have used a Power Combiner as you suggested.
Project A used WDM Add and Drop Components while Project B is the same simulation using FBG and Power Combiner. The results are different in terms of power values. However, they both hint at the same result. In a practical scenario which one would be better?
I have another doubt on power penalty calculation. I have posted it as a new thread.