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Length dependence of bandwidth for fibers with small axial profile fluctuations

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Abstract

A slight deviation from the optimal index profile drastically decreases bandwidths of graded-index fibers. For spliced fibers whose profiles are slightly different from each other, the true bandwidth is often found to be much wider than that calculated from linear extrapolation. This effect is mainly due to the compensation of modal dispersion (CMD). On the other hand, this compensation effect is not restricted to spliced fibers, because the bandwidth of a continuous fiber with axial profile fluctuations also can be affected by CMD. Several papers presented numerical analyses on bandwidths of spliced fibers with CMD. However, the analyses did not give the asymptotic formula or qualitative explanation for the bandwidth of an optical transmission line with profile fluctuations. Based on a statistical approach, this paper describes the analytical formula explaining the length dependence of fiber bandwidths affected by CMD.

© 1981 Optical Society of America

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