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Engineering Physics by S. Mani Naidu

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11.7 Attenuation in optical fibres

A very important parameter of an optical fibre is the attenuation of light signal in the fibre. Attenuation decreases light transmittance. Usually, the power of light at the output end of optical fibre is less than the power launched at the input end, then the signal is said to be attenuated. The signal attenuation is defined as the ratio of the input optical power (Pi) into the fibre to the power of light coming out at the output end (P0). The attenuation coefficient is given as:

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The causes of attenuation are numerous, some of them are waveguide structure, material compositions, material dispersion, material ...

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