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The optical fibre works on the principle of total internal reflection. Light rays can be used to transmit a huge amount of data, but there is a problem here – the light rays travel in straight lines. So unless we have a long straight wire without any bends at all, harnessing this advantage will be very tedious. Instead, the optical cables are designed such that they bend all the light rays inwards (using TIR). Light rays travel continuously, bouncing off the optical fibre walls and transmitting end to end data. Although light signals degrade over progressing distances, depending on the purity of the material used, the loss is much less than using metal cables. A Fibre Optic Relay System consists of the following components:

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Optical fibre is the technology associated with data transmission using light pulses travelling along with a long fibre which is usually made of plastic or glass. Metal wires are preferred for transmission in optical fibre communication as signals travel with fewer damages. Optical fibres are also unaffected by electromagnetic interference. The fibre optical cable uses the application of total internal reflection of light. The fibres are designed such that they facilitate the propagation of light along with the optical fibre depending on the requirement of power and distance of transmission. Single-mode fibre is used for long-distance transmission, while multimode fibre is used for shorter distances. The outer cladding of these fibres needs better protection than metal wires.

The mode of propagation and refractive index of the core is used to form four combination types of optic fibres as follows:

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We know that optical fibre has revolutionised the communication sector and made efficient data transmission possible. It consumes less power and is non-flammable. In this article, let us learn about optical fibre, types of optical fibre, working of optical fibre and its advantages in detail.