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Launching condition dependence of graded-index multimode fiber loss and bandwidth

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2 Author(s)
Koyamada, Y. ; Electr. Commun. Labs., NTT, Ibaraki, Japan ; Yamashita, K.

Theoretical and experimental studies of the launching-condition dependence of graded-index 50-μm core, 0.2-numerical aperture multimode fiber transmission loss and baseband bandwidth are discussed. A combination of a SGS mode scrambler and a mandrel wrap mode filter was used as the launching system. It was found that steady-state fiber loss measurements should be carried out at an approximate mandrel curvature of ρ=0.07 mm-1. This curvature is much smaller than the curvature ρ=0.15 mm-1 which produces an equilibrium-mode distribution as defined by the International Telegraph and Telephone Consultative Committee (CCITT). Measurement at ρ=0.15 mm-1 is shown to underestimate steady-state loss. It was also found that reproducible and reasonable bandwidth measurement can be obtained by choosing ρ=0 to 0.07 mm-1

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Lightwave Technology, Journal of  (Volume:6 ,  Issue: 12 )