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Is PS-QPSK really an alternative to PDM-QPSK?

: Fischer, J.K.; Nölle, M.; Molle, L.; Schmidt-Langhorst, C.; Schubert, C.

Schäffer, C. ; Informationstechnische Gesellschaft -ITG-, Fachausschuß 5.3 Optische Nachrichtentechnik; Informationstechnische Gesellschaft -ITG-, Fachgruppe 5.3.3 Photonische Netze:
Photonische Netze. Vorträge der 13. ITG-Fachtagung 2012 : 7. bis 8. Mai 2012 in Leipzig
Berlin: VDE-Verlag, 2012 (ITG-Fachbericht 233)
ISBN: 978-3-8007-3437-5
Fachtagung Photonische Netze <13, 2012, Leipzig>
Conference Paper
Fraunhofer HHI ()

In this contribution, we compare the performance of polarization-division multiplexing (PDM) quadrature phase-shift keying (QPSK) signals and polarization-switched (PS) QPSK signals in single-channel and wavelength-division multiplexing (WDM) transmission experiments over up to 15000 km ultra-large-effective-area fiber (ULAF). We discuss the influence of nonlinear intra-channel and inter-channel impairments on both modulation formats. Furthermore, we investigate the application of optical Nyquist pulse shaping and a reduced WDM channel spacing to increase the spectral efficiency of PS-QPSK signals. In particular, this could be an attractive option for future bandwidth-elastic optical networks using software-defined transponders. Finally, we try to answer the question whether PS-QPSK could be an alternative or complement to PDM-QPSK.