The author of this article claims to have insider information that Cisco is in in talks to purchase the optical chip maker Luxtera. Although this intent to purchase has not been confirmed by the company and no info has been released this buy can be potentially valued in hundreds of millions of dollars.
https://www.bloomberg.com/news/articles/2018-12-11/cisco-is-said-to-be-in-talks-to-buy-optical-chip-maker-luxtera