Dark Fiber and Infrastructure (DF&I), an emerging dark fiber provider, is acquiring USA Fiber's Northern, Va. and Md. fiber and conduit assets, a move to further its network presence in a key internet traffic market.Financial terms of the agreement were not revealed. While DF&I is new to the scene, its founders, John Schmitt and Judd Carothers, are hardly novices in the dark and lit fiber market segment.