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We propose a transponder-independent metric that can uniquely describe the performance of dispersion uncompensated links. Derived from OSNR and performance measurements using an available transponder, it can be used for performance prediction of any other transponder on the optical path.
Using optimized hybrid Raman-EDFAs and coded modulation with variable spectral efficiency we achieve 54 Tb/s capacity over 9,150 km transmission. We also achieve a capacity-distance product of 534 Pb/s∗km after 10,230 km distance.
We transmit 106 × 200 Gb/s channels over 10 290 km at 6.0 b/s/Hz enabled by Nyquist spectral shaping and digital back propagation (DBP). 53 × 400 Gb/s channels are also transmitted over 9200 km detecting two 200 Gb/s wavelengths simultaneously using a wideband receiver. DBP benefit versus channel pre-emphasis, average launch power per channel, and transmission distance are experimentally investigated...
This paper reviews recent advances in transoceanic distance transmission technology including digital spectral shaping, coded modulation, variable spectral efficiency, and nonlinearity compensation to facilitate higher capacity and higher spectral efficiency.
We transmit 30.58 Tb/s data (294×104 Gb/s) over 7,230 km in 40 nm bandwidth with 6.1 b/s/Hz spectral efficiency. We use PDM half-4D-16QAM coded modulation to achieve the highest reported capacity-distance product of 221 Pb/s·km.
We experimentally measured nonlinear noise induced by broadband FWM over different power levels, system lengths, and transmission bandwidths in dispersion uncompensated systems. We confirmed that broadband FWM induced noise is proportional to PSD3, L1, and Log(BW).
We experimentally demonstrate inter-symbol interference (ISI) mitigation using a multi-tap constant modulus algorithm (CMA) for strongly filtered PDM RZ-QPSK and find it to be effective up to Nyquist channel spacing after transpacific transmission distances.
We review our recent 100G, high spectral efficiency, transmission experiments over transoceanic and regional distances. Transmitter pre-filtering together with a MAP detection algorithm can significantly improve spectral efficiency.
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 successfully demonstrated 64×40Gb/s transmission over 6,550km installed undersea cable using SubCom's 40G transceivers. More than 3.3dB FEC margin for all measured channels was achieved matching our simulator predictions.
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 study transmission of 40 Gb/s signals using coherent RZ-QPSK with and without polarization multiplexing using 100 km large effective area fiber-spans and dual-stage EDFAs with mid-stage dispersion compensation. We show advantage and disadvantage of coherent detection schemes.
The Erbium-doped Fiber Amplifier (EDFA) is a key technical feature in nearly every optical undersea transmission system. This paper reviews simple performance enhancing Raman and ROPA assisted amplifier architectures.
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.
We demonstrate 1 Tb/s capacity at 40% spectral efficiency over 2055 km of non slope-matched fiber with 40 Gb/s channel data rate. Very high values of accumulated dispersion do not significantly affect system performance
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