PhotonEx, an optical networking start-up, has secured $80 million in second-round funding led by Oak Investment Partners, Essex Investment Management, Matrix Partners, North Bridge Venture Partners, Intel Capital and the Photonics Fund. PhotonEx's management team, led by chief executive Kristin Rauschenbach, includes talent from MIT and Bell Labs. PhotonEx's technology allows for Internet and data transfer speeds of up to 40 gigabits per second (gbps).