Fiber optic cable

Fiber optic cable is the twisted pair cable is categorized into seven classes. Category 1 of cables is utilized in phone lines with data rate around 0.1 Mbps. Whereas Category 5 utilized in LANs having 100 Megabyte per second data rate. Comparing attenuation versus frequency measures performance of twisted pair cable. Attenuation increases with frequency over 100 kHz. These cables are used to provide data and voice stations. Area networks and DSL lines use twisted pair cables. High frequency signals are carried by cable. Coax has a center conductor of wire enclosed. This outer conductor completes the circuit. Outer conductor is enclosed in an insulator, and a plastic cover protects the cable.

These cables are categorized by RG ratings. RG-59 utilized for Ethernet, RG-58 for Ethernet and RG-11 for Cable tv. The connector is named BNC connector, it is used to link the cable’s end. Even though the cable has greater bandwidth, but its attenuation is higher compare to twisted pair cables. It’s widely utilized in digital phone networks where a single cable may carry data up to 600 Mbps. Cable television Networks utilize RG-59 coaxial cable. This cable is also used by Ethernet LANs. A fiber optic cable transmits signals within the form of light. Fiber usage reflection to guide light.

It consists of two components: cladding and core. Core is more pliable compare to cladding and consists of glass or plastic. Cladding acts as a cover. The main difference in density of nucleus and cladding is such that a ray of light moving throughout the center can be reflected off the cladding, instead of being refracted into it. Two modes of propagation of light are possible within optical fiber like! multimode and single mode. Multimode fiber allows multiple beams from a source of light move throughout the core. In multimode step index fiber, the center density remains constant from the center into the edges. However in multimode graded index fiber, center density progressively decreases from center of the center to its edge. Graded index fiber creates less distortion within the signal than the index step.

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