Hi Aasif,
In OptiSystem, for evaluation extension you can click on “License Extension” in start menu under “OptiSystem” folder, and then clock on “collect information” button in the new window to create a c2v file. then you have to send the file to Optiwave so that they send you the activation code. It may have a similar process for Opti-Grating. However, since you have used 30-day evaluation, you may need to go for a monthly lease. You can contact Bryan about this at bryan.tipper@optiwave.com .
Regards