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We experimentally study the reach of coherent 40 Gb/s PDM (polarization division multiplexed) RZ QPSK (return-to-zero quaternary phase shift keying) transmission at several spectral efficiencies. Transpacific transmission distance at 3.2 bits/s/Hz and record SE-distance product at 2.4 bits/s/Hz are demonstrated.
We investigate a high spectral efficiency transmission approach employing aggressive pre-filtering and multi-symbol detection. We show that pre-filtering induces symbol correlation thus enabling a higher spectral-efficiency limit than that of the original modulation format. We demonstrate 100 G transoceanic transmission at 419% spectral efficiency using this approach.
We transmit 112×112 Gb/s pre-filtered PDM RZ-QPSK channels with 360% spectral efficiency over 9,360km with the channel spacing set to the baud rate. This results in a record spectral efficiency for transpacific distance.
We have quantified the system margin afforded by polarization scrambling with a direct measurement of the errored events from a noise loaded FEC decoder. We have demonstrated a margin enhancement of 1.2 dB after 8,856 km transmission.
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