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We propose second-order-polarization-mode-dispersion (SOPMD) estimation technique for polarization-multiplexed coherent single-carrier system using data-aided channel estimation and PMD model analysis. The technique is demonstrated for 25-Gbaud QPSK and 16-QAM systems, to accurately estimate various amount of SOPMD.
Implicit training is successfully demonstrated for the first time in a 40-Gb/s QPSK experiment and 224-Gb/s 16-QAM simulation. Overhead-free transmission can be achieved with less than 0.5 dB Q-penalty compared to traditional explicit training scheme.
We propose a technique for polarization-mode-dispersion (PMD) estimation in 16-QAM coherent polarization-multiplexed single-carrier system using complementary Golay training sequences and channel response filter analysis. The technique is experimentally proved to be fast and highly accurate.
We present a novel moments-based method for optical signal-to-noise ratio (OSNR) monitoring in polarization-multiplexed coherent optical systems. The method is experimentally demonstrated to show high accuracy in OSNR monitoring over a large range for both constant and non-constant modulus modulation formats.
We numerically and experimentally investigate the limits of terminal-based optical dispersion compensation for nondispersion-managed systems, using coherent transmission technology. The resulting residual dispersion is , which is within the digital signal processing compensation range of first generation coherent transponders.
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 present the first experimental demonstration of simultaneous monitoring of firstorder PMD with random power-split and chromatic dispersion using asynchronous delay-tap sampling, in a commercial 10 Gbit/s WDM test-bed. Accuracies achieved were plusmn3.1 ps and plusmn17 ps/nm.
A simulation study is presented which investigates the possibility of obtaining better spatial resolution and similar or improved statistical performance from a coded waveform compared to a continuous frequency (CF) narrowband pulse for colour flow imaging (CFI) applications. Our attention is focused on linear frequency modulated (LFM) chirps. We show that it is possible to improve the spatial resolution...
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