45.8-Gb/s and 125-Gb/s CP-QPSK/CP-BPSK field trial over installed submarine cable

V.A.J.M. Sleiffer, V. Veljanovski, D. Borne, van den, J. Capasso, H. Kuluslu, J. Seixas, V.L. Schramm, A. Tschersich, R. Nogueira, N.B. Pavlovic, K. Ivarson, S. Spälter, H. Waardt, de

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We show successful transmission of 45.8-Gb/s and 125-Gb/s coherent-detected polarization-multiplexed quadrature phase-shift keying (CP-QPSK) over both 2054 km and 4108 km of 10-Gb/s non-return to zero (NRZ) optimized field-deployed submarine cable. Moreover we report successful transmission of 45.8-Gb/s coherent-detected polarization-multiplexed binary phase-shift keying (CP-BPSK) over 9420 km of legacy submarine fiber. We present single channel transmission results, as well as wavelength-division multiplexed (WDM) transmission results with co-propagating WDM channels placed on a 100-GHz and on a 50-GHz grid, where we optimized the transmission performance by sweeping the launch power and pre-compensation. For 45.8-Gb/s CP-QPSK a margin with respect to the FEC-limit of 1.7 dBQ was obtained after transmitting over a 4108 km distance in a 50-GHz grid WDM configuration. Considering the transmission of 125-Gb/s CP-QPSK over the same distance and with the same channel configuration, a 1.1 dBQ margin was measured, showing the feasibility of a tenfold increase in transmission capacity over legacy submarine fiber. This significantly delays the costly alternative of deploying a new submarine cable. For the transmission of a 45.8-Gb/s CP-BPSK modulated signal on a 50-GHz WDM grid over a 9420 km distance, a margin of 1.2 dBQ with respect to the FEC-limit is reported. This underlines the great robustness of CP-BPSK towards nonlinear fiber impairments and thereby the feasibility to cross trans-oceanic distances with this modulation format.
Original languageEnglish
Pages (from-to)624-633
Number of pages10
JournalJournal of Lightwave Technology
Issue number4
Publication statusPublished - 2012


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