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Joint-polarization carrier phase estimation for PS-QPSK signals

: Alreesh, S.; Fischer, J.K.; Nölle, M.; Schubert, C.


IEEE Photonics Technology Letters 24 (2012), Nr.15, S.1282-1284
ISSN: 1041-1135
Fraunhofer HHI ()

We 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.