Abstract
The length dependence of the modal bandwidth in graded-index multimode fibers has recently been shown to decrease as a square root, i.e., BW~ L−γ, where γ = 1/2 at the peak wavelength λp for randomly correlated index perturbations.1,2 It was further shown that statistical equalization and not mode coupling was the dominant mechanism for these observations. Figure 1 displays an example of this where the length exponent γ for a 13.3-km concatenated system was recently measured. A value γ = 0.5 corresponding to random behavior was obtained at the peak wavelength, λp ~ 1300 nm.
© 1983 Optical Society of America
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