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It is known that fiber nonlinearities induce crosstalk in a wavelengthdivision multiplexed (WDM) system, which limits the capacity of such systems asthe transmitted signal power is increased. A network user in a WDM system is anentity that operates around a given optical wavelength. Traditionally, thechannel capacity of a WDM system has been analyzed under different assumptionsfor the transmitted signals of the other users, while treating the interferencearising from these users as noise. In this paper, we instead take a multiuserinformation theoretic view and treat the optical WDM system impaired bycross-phase modulation and dispersion as an interference channel. Wecharacterize an outer bound on the capacity region of simultaneously achievablerate pairs, assuming a simplified K-user perturbative channel model usinggenie-aided techniques. Furthermore, an achievable rate region is obtained bytime-sharing between certain single-user strategies. It is shown that suchtime-sharing can achieve better rate tuples compared to treating nonlinearinterference as noise. For the single-polarization single-span system underconsideration and a power 4.4 dB above the optimum launch power, treatingnonlinear interference as noise results in a rate of 1.67 bit/sym, whiletime-sharing gives a rate of 6.33 bit/sym.

Capacity Region Bounds for the K user Dispersive Nonlinear Optical WDM Channel with Peak Power Constraints