Abstract
We present a general treatment of multispan effects on Shannon channel capacity for dispersion-free nonlinear optical fiber transmission. We have derived a closed-form formula that is exact and applicable for arbitrary input signal power and noise power. The nonlinear interference among the accumulated Kerr nonlinear noises and the amplifier noises along each span will be investigated. The dependence of the channel capacity on various operating renditions and system parameters will be studied. We have derived a simple scaling law for the Shannon capacity as given by log, [1+CN/sub s//sup -4/3/N/sub c//sup -2/3//spl gamma//sup -2/3/P/sub W//sup -2/3/] for Nb spans and N/sub c/ channels, where /spl gamma/ is the Kerr nonlinearity coefficient and P/sub W/ is the average noise power density for each amplifier.
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