Optical fiber is used by telecommunications companies to transmit telephone signals, Internet communication and cable television signals. An optical transmitter is a device that converts electrical signals into optical signals, which are then transmitted through an optical fiber. The light is a form of carrier wave that is modulated to carry information. Fault Detectability in DWDM provides a treatise on fault mechanisms are detected. Next Generation SONET/SDH: Voice and Data (Wiley/IEEE 2004) protocols that make possible voice and data convergence over. Mostly, OFC (optical fiber communication) plays an essential role in the telecommunication system development with a high speed as well as quality. While LEDs are used for short-range applications and are less coherent, laser diodes are preferred for long-range transmission becau enerate light through electro luminescence in a semiconductor material.
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