The biggest use is telephony, followed by CATV, then LAN backbones, connecting hubs. NEXT is connecting remote VIDEO cameras for security systems. The building management and security systems are switching to fiber in many BUILDINGS due to distance and EMI requirements. Fiber is not often used to the desk because it is perceived to be too expensive, but it allows a system without wiring closets, making the cost less in most instances. Gigabit Ethernet will drive even more fiber into networks, since UTP applications will be too DIFFICULT to install. 

The biggest use is telephony, followed by CATV, then LAN backbones, connecting hubs. Next is connecting remote video cameras for security systems. The building management and security systems are switching to fiber in many buildings due to distance and EMI requirements. Fiber is not often used to the desk because it is perceived to be too expensive, but it allows a system without wiring closets, making the cost less in most instances. Gigabit Ethernet will drive even more fiber into networks, since UTP applications will be too difficult to install.