Liberty Communications, Inc, 3281 Crestmoor Dr, Saint Paul, MN 55125, US

Founded in 1979, Clearfield, Inc. focuses on research in the fields of optoelectronic and optical systems. Clearfield consists of an optronics group and a cables and networks group. The two groups develop, design, manufacture and market fiber optics, copper and gallium nitride-based components and devices for industrial, commercial, consumer and scientific applications. The optronics division is active in the development, design, manufacture and marketing of ultraviolet measurement instruments for consumers and industrial customers. It also offers gallium nitride-based transistors for power amplifiers and other commercial applications. The cables and networks division designs, manufactures and markets a variety of fiber optic and copper components to the data communication and telecommunication industries. The company s broad range of product offerings includes fiber distribution systems, optical components, and fiber and copper cable assemblies that serve various markets. Clearfield is headquartered in Plymouth, Minn.