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We experimentally evaluated the estimation accuracy of nonlinear noise models under various transmission conditions, where several different modulation formats, WDM channel configurations, and fiber launch power cases were considered. We found that the approximate EGN model has high estimation accuracy, showing good agreement with the experimental results.
We numerically investigate the transmission performance of 3-bit/symbol modulation formats in dispersion-unmanaged transmission systems. We find that probabilistic-shaped 64QAM has higher achievable rate than the other formats in back-to-back condition as well as after transmission.
We propose an accurate and robust in-phase/quadrature (IQ) skew measurement method for optical Mach-Zehnder IQ modulator based on image spectrum analysis. Numerical simulation and experiment results demonstrate 0.7ps measurement accuracy. The robustness to bias deviations and finite extinction ratios were also investigated.
We show that 32 GBaud single- and multi-carrier DP-QPSK can deliver longer reach for the same capacity as 64 GBaud DP-QPSK. However, 64 GBaud multi-carrier DP-QPSK signal can provide 12% longer reach than single-carrier 32 GBaud DP-QPSK.
A perturbation-based digital nonlinear compensation and effective means of using it in an optical network were reviewed, and a real-time transmission by a 100 Gbit/s transceiver with the implemented digital nonlinear compensator was demonstrated.
Nonlinear distortion is considered as the ultimate limitation of optical transmission. Various digital nonlinear distortion compensation methods, including perturbation based method for long reach application and Volterra based method for short reach application are reviewed.
We numerically and experimentally investigate spectrum optimization techniques including adjustment of subcarrier symbol rate and subcarrier frequency spacing for multi-subcarrier modulation. Improvement of nonlinear tolerance is experimentally evaluated in Nyquist-FDM-DP-QPSK through 2,400 km transmission.
We experimentally demonstrate high splitting ratio (up to 1:512) and adaptive Intra-PON transmission with a remotely pumped EDFA (R-EDFA) and distantly powered QPAR node. 75 dB power budget at BER of 10−3, and 3.5 ms remote switching time are obtained.
We propose and numerically evaluate a novel sub-band processing architecture for computational complexity reduction of the perturbation-based nonlinear compensator. The complexity is reduced by a factor of 12.4 in 3000-km transmission with 0.1 dB penalty.
We propose a novel PDL-tolerant signal generation and reception method without additional optical devices and numerically demonstrate its efficiency for a 128 Gbit/s 2 subcarrier Nyquist-FDM DP-QPSK signal.
We propose an individual channel launch power control method co-operated with nonlinear compensation in digital signal processing. Its effectiveness is evaluated in a network case study with various distances and modulation formats by numerical simulation.
We numerically confirm that duobinary-pulse format suffers larger nonlinear impairment than NRZ and Nyquist-pulse formats. Nonlinearity-induced penalty, however, is found to be constant against the channel spacing in super-Nyquist WDM transmission. Also, we evaluate the benefit of digital nonlinear compensation.
In order to push the nonlinear Shannon limit further within practical implementation constraints, we discuss various nonlinear compensation techniques for intra- and inter-subcarrier nonlinear effects. Experimental and numerical results prove the benefit is not just pre-FEC BER improvement.
We propose and numerically evaluate a symbol degeneration method to simplify the perturbation-based nonlinear equalizer for 16QAM. The proposed method shows better performance than previously proposed simplification method without increasing computational complexity.
We propose a decision-aided intra-channel nonlinear equalizer based on a perturbation method, which offers one-stage compensation and symbol rate operation. It tolerates errors in decision-aided data and shows fine performance in 128Gbit/s DP-QPSK transmission experiment.
We propose and numerically evaluate a simplified pre-distortion algorithm to compensate intra-channel nonlinearity for 16QAM, which provides gate-count reduction through multiplier-free implementation. We confirm the tolerance to chromatic dispersion uncertainty and the applicability to different pulse formats.
We experimentally demonstrate that the transmitter-side non-linear mitigation, combination of non-linear pre-distortion with RZ carving is robust against polarization mode dispersion and polarization dependent loss in real-time 112 Gb/s DP-QPSK transmission over 2,000km mixed fiber link.
One stage nonlinear digital pre-distortion and pulse-carving extend the transmission reach by 40% in real-time DWDM DP-QPSK transmission using digital coherent CMOS LSI. Practical robustness against link uncertainties was confirmed.
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