Quantum Bridge Communications, an optical equipment provider, has signed a three-year deal worth $50 million to provide gear to Advanced TelCom Group, a competitive local phone and Internet service provider. The contract marks Quantum Bridge's first customer. Quantum Bridge's Optical Access System allows carriers such as ATG to split optical wavelengths, the multi-colored beams of light that carry voice and data on fiber optic networks, thus allowing for greater flexibility in serving business customers. ATG serves 18,000 customers primarily in the western United States.