We design and manufacture fiber optic connectors, fiber optic cable assemblies, and custom fiber optic products for use in harsh environments. OCC's fiber optic cables and connectors have been qualified to the most demanding military specifications, including: The 5 primary advantages of fiber optic cable over. For more than 25 years QPC Fiber Optic has worked with the United States Department of Defense, North Atlantic Treaty Organization (NATO) Militaries, and their respective Tier I and Tier II Contractors, to provide Harsh Environment Fiber Optic Connectivity Solutions for the most demanding mission.