Claims and counterclaims as Acacia looks to call off Cisco merger 12 Jan 2021 Maker of silicon photonics components believes it is now worth more than the $2.6BN agreed by the two firms in 2019. The planned merger of Cisco Systems and Acacia Communications appears to be in serious doubt, with Acacia attempting to terminate the July 2019 agreement. Acacia, which specializes in optical communications interconnects based on silicon photonics and photonic integrated circuits (PICs), said that it was calling off the $2.6Â billion deal, after an 18-month window for gaining approvals from regulatory authorities expired January 8. The Maynard, Massachusetts, company claimed that approval from Chinaâs State Administration for Market Regulation (SAMR) was not received within the agreed merger timeframe, meaning that it was no longer obliged to close the deal.