ELE 5OPN Chapter Notes -Raman Scattering, Photon, Polarization Density
19 Oct 2013
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Ele5opn chapter 2 propagation of signals in optical fibre textbook notes (these notes must be read along side the textbook for maximum retention of concepts. Optical fibres are a very good communication media because they provide very low loss in the operating wavelength range. The performance of optical fibres is best in the wavelength range of 0. 8 m, 1. 3 m and. There are 2 main losses dominant in optical fibres material absorption & rayleigh scattering. Material absorption is the loss due to absorption by silica and other impurities in the fibre. These irregularities are introduced during the fibre manufacturing process. The material absorption losses in the operating bands are 2. 5db/km @ 0. 8 m, 0. 4db/km @ 1. 3 m & 0. 25db/km @ 1. 55 m. Here the lowest material absorption loss is at 1. 55 m. With 0. 25db/km regeneration of optical signals can take place after. However, practical communication systems regenerate signals after the loss becomes close to.
