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12 February 2016 Impact of inter-core crosstalk in radio-over-fiber transmission on multi-core optical media
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Optical transmission in multi-core optical media has the potential of great capacity and scalability for current and future optical networks. Optical fronthaul networks are expected to employ relatively high optical intensity levels when a large number of cores are connected to a large number of antennas. In this paper, the crosstalk characteristics of multi-core fiber operating in non-linear regime are identified, indicating advantageous performance in optical fronthaul radio-overfiber transmission. The nonlinear coupled-mode and coupled-power theories are revisited to demonstrate theoretically that the underlying Kerr effect mismatches the phase constant of the core modes reducing the mean and variance of the crosstalk when nonlinear regime is employed. This theoretical analysis is validated experimentally in this work using a homogeneous 4-core optical fiber in radio-over-fiber transmission for LTE fronthaul applications. In addition, the impact of the linear and nonlinear inter-core crosstalk in the error vector magnitude (EVM) is evaluated with the optical transmission of fully-standard LTE-Advanced signals using MIMO and SISO configurations operating in both linear and nonlinear power regimes.
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Andrés Macho, Maria Morant, and Roberto Llorente "Impact of inter-core crosstalk in radio-over-fiber transmission on multi-core optical media", Proc. SPIE 9772, Broadband Access Communication Technologies X, 97720O (12 February 2016);

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