Abstract
We show successful transmission of 45.8 and 125 Gb/s coherent-detected
polarization-multiplexed quadrature phase-shift keying (CP-QPSK) over both
2054 and 4108 km of 10 Gb/s nonreturn-to-zero-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 copropagating 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 precompensation. For 45.8 Gb/s CP-QPSK, a margin with
respect to the forward error correction (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 toward
nonlinear fiber impairments and thereby the feasibility to cross
transoceanic distances with this modulation format.
© 2011 IEEE
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