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What are the characteristics of Step Index Fibres ?

April 26, 2017characteristics fibres index step

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What are the characteristics of Step Index Fibres ?

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• Step-Index multimode Fibres are simple types with core of 100-3000µm in diameter. They collect light efficiently from large area sources, but modal dispersion usually limits bandwidth to about 20Mhz-km • The number of modes a step index fibre can transmit depends on its numerical aperture and core diameter as well as the wavelength. Single mode types have core diameters of about 8-10µm • Step -Index multimode fibres come in all glass, plastic clad silica, and all plastic versions of various sizes. • Single mode step index fibres, with core about 8-10mm across suffer no modal dispersion. The two components of their chromatic dispersion- material and waveguide dispersion-add to zero around 1300nm, giving them extremely high bandwidth with loss around 0.34-0.5 dB/km.