Hi All
I tried by copy pasting the link posted by Naazira. It is very much available its just that there was a problem posting the link i guess. You can also try like that or i would repost it for convenience. As it is really an important link as it mentions about optimization starting with the SPO optimization in optisystem tutorials page 6.
https://optiwave.com/category/optisystem-manuals/optisystem-tutorials/page/6/
Regards
Burhan