Hi Aabid Baba sir,
as far as most authenticated site for sysmbols for different components in the library, i am posting you some authenticated sites of CISCO and other sites.
http://www.conceptdraw.com/examples/cisco-optical
https://technet.microsoft.com/en-us/library/bb962026.aspx
https://optiwave.com/resources/latest-news/additional-features-included-with-optisystem/