Xtera, an Allen, Texas company that supplies optical transport technology to broadband service providers, said it has raised $52 million in new financing.

The round was led by existing investors New Enterprise Associates (NEA) and ARCH Venture Partners and by new investor Wellcome Trust of London. Wellcome Trust made up about half of the investment.

Here’s the statement.

Xtera says it offers a offers a “multi-reach OADM transport solution with the headroom to deliver abundant high-quality video, data and advanced voice services” — serving regional, long haul, ultra-long haul and “unrepeatered submarine” applications.

The company told VentureWire (subscription only) it is also about to embark on a series of acquisitions, the first one to be announced Monday.

This company has been around for a while. Founded nine years ago, Xtera struggled in 2003 after the telecom investment bubble burst, and recapitalized.

Other investors include Berkeley International, CenterPoint Venture Fund, ComVentures, EDF Ventures, Hook Partners, InterWest Partners, Rho Ventures, Sevin Rosen Funds and Start Ventures.