Packet-optical transport start-up Cyan Inc. has raised an additional $10 million in venture capital, according to a regulatory filing with the US Securities and Exchange Commission (SEC).

Formed in 2006, Cyan has raised more than $70 million to date, including $30 million in the previous round just over a year ago. According to the filing, the latest cash injection was a Series F round.

Investors include Azure Capital Partners, Norwest Venture Partners and Tenaya Capital.

Cyan executives confirmed the investment, but declined to comment further.

The company rolled out several new products in 2011, most of them software and services based (see "Cyan makes software move with CyPortal, Service Level Aware Network framework,""Cyan adds multi-vendor capabilities to network management system," and "Cyan CyNOC Services offer NOC backup, outsource opportunity"). It also unveiled an offering directed at mobile backhaul applications (see "Cyan moves into wireless backhaul with TowerAware").

For more information on packet-optical systems and suppliers, visit the Lightwave Buyer’s Guide.