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The performance of pilot-aided joint-channel carrier-phase estimation (CPE)in space-division multiplexed multicore fiber (MCF) transmission withcorrelated phase noise is studied. To that end, a system model describinguncoded MCF transmission where the phase noise comprises a common laser phasenoise, in addition to core- and polarization-specific phase drifts, isintroduced. It is then shown that the system model can be regarded as a specialcase of a multidimensional random-walk phase-noise model. A pilot-aided CPEalgorithm developed for this model is used to evaluate two strategies, namelyjoint-channel and per-channel CPE. To quantify the performance differencesbetween the two strategies, their respective phase-noise tolerances areassessed through Monte Carlo simulations of uncoded transmission for differentmodulation formats, pilot overheads, laser linewidths, numbers of spatialchannels, and degrees of phase-noise correlation across the channels. For 20GBd transmission with 200 kHz combined laser linewidth and 1% pilot overhead,joint-channel CPE yields up to 3.4 dB improvement in power efficiency or 25.5%increased information rate. Moreover, through MCF transmission experiments, thesystem model is validated and the strategies are compared in terms ofbit-error-rate performance versus transmission distance for uncodedtransmission of different modulation formats. Up to 21% increase intransmission reach is observed for 1% pilot overhead through the use ofjoint-channel CPE.

Pilot-Aided Joint-Channel Carrier-Phase Estimation in Space-Division Multiplexed Multicore Fiber Transmission