Alreesh, S.S.AlreeshFischer, J.K.J.K.FischerNölle, M.M.NölleSchubert, C.C.Schubert2022-03-042022-03-042012https://publica.fraunhofer.de/handle/publica/22927610.1109/LPT.2012.2201933We investigate a carrier phase estimation algorithm for the polarization-switched quadrature phase-shift-keying modulation format. The algorithm, which is based on the conventional block Mth power feed-forward scheme, works jointly on both polarizations and shows a significant performance improvement compared with a polarization-independent scheme. We evaluate the tolerance to laser phase noise in numerical simulations and the tolerance to nonlinear distortions in single-channel and Nyquist wavelength-division-multiplexing transmission experiments over up to 17 000 km of ultralarge-effective-area fiber.en621535journal article