Hi Faiz,
I am unable to upload the osd file due to internet connectivity.
Here i am sharing some links which help you understand MM wave generation for Radio over fiber.
https://smartech.gatech.edu/bitstream/handle/1853/24640/iia_zhensheng_200808_phd.pdf
http://www.nature.com/articles/srep19891
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4810219&abstractAccess=no&userType=inst
Thanks,