Fibre-optic communication involves transmitting a signal as light, converting electrical signals to optical signals at the transmitter end and reversing the process at the receiver end. Light acts as a carrier wave and can be modulated to carry information. Optical fibre is preferred over electrical cabling for long-distance transmission. Fiber-optic communication is a form of optical communication for transmitting information from one place to another by sending pulses of infrared or visible light through an optical fiber. An Optical Fiber is a cylindrical fiber of glass that is hair-thin in size or any transparent dielectric medium. Optical fiber wave guides- Introduction, Ray theory t ansmission, Total Interna ERS: Attenuation, Absorption, Scattering and Bending losses, Core and Cladding losses.