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Design of strain-free-fiber with nonuniform dopant concentration for stimulated Brillouin scattering suppression

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2 Author(s)
Ohashi, M. ; R&D Center, NTT Telecommun. Field Syst., Ibaraki, Japan ; Tateda, M.

The loss and dispersion properties of fibers with a nonuniform dopant concentration along their length are investigated theoretically and simple equations are obtained for loss and dispersion estimation. These equations are used to discuss fiber properties and a design procedure by which to achieve SBS suppression. The loss increases by 0.02-0.03 dB/km/% and the dispersion decreases by -2.4 ps/km/nm/% as the relative-index change due to dopant increases longitudinally. It is found that a large change in the dopant concentration along a fiber is effective in suppressing SBS

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Lightwave Technology, Journal of  (Volume:11 ,  Issue: 12 )