Communication cable includes an optical fiber, a first tubular electrical conductor enclosing the optical fiber, a second tubular electrical conductor enclosing the first electrical conductor, and a dielectric support element disposed between the conductors for maintaining the conductors in a coaxial...http://www.google.fr/patents/US4896939?utm_source=gb-gplus-shareBrevet US4896939 - Hybrid fiber optic/electrical cable and connector
