AT&T Wireless and Sprint last week announced a reciprocal Wi-Fi service roaming agreement for Denver International, Kansas City International, Philadelphia International, Raleigh-Durham International and Salt Lake City International airports. This is the first such agreement between the carriers, whose customers will be able to roam using their existing user IDs and passwords.

The carriers say their systems will be linked sometime this year.

Lambda Opticalsystems has landed $14 million in Series B funding from Sevin Rosen Funds and ComVentures. The funding comes after $10 million in Series A capital awarded in March 2003.

The start-up develops all-optical switches that integrate 3D MicroElectroMechanical Systems technology with dense wavelength division multiplexing to let wavelengths carrying different services be switched without electrical conversion. This capability reduces network capital requirements by up to 80%, the company says. Lambda also makes management software.