Hi Masud Rana,
I understand that the Matlab component does cause confusion! Have you tried watching the short tutorial videos at:
Let me know if these help because that was their purpose! Also if you are not familiar or perhaps “rusty” with Matlab I would suggest reviewing their help on data structures:
http://www.mathworks.com/help/matlab/structures.html
I think with understanding data structures and the way OptiSystem stores data into these Matlab data structures the rest is much easier.
Regards