Spectrally Efficient Quadrature Duobinary Coherent Systems With Symbol-Rate Digital Signal Processing

@article{Li2011SpectrallyEQ,
  title={Spectrally Efficient Quadrature Duobinary Coherent Systems With Symbol-Rate Digital Signal Processing},
  author={Jianqiang Li and Zhenning Tao and Huijian Zhang and Weizhen Yan and Takeshi Hoshida and Jens C. Rasmussen},
  journal={Journal of Lightwave Technology},
  year={2011},
  volume={29},
  pages={1098-1104}
}
An enhanced digital coherent receiver including a novel blind equalization approach and maximum-likelihood sequence detection (MLSD) is proposed for dual-polarization quadrature duobinary (DP-QDB) systems. In virtue of the compact spectrum of DP-QDB signals approaching Nyquist limit, the equalization is implemented at symbol rate, which relaxes the demand on the sampling speed of analog-to-digital converters (ADCs). The proposed symbol-rate receiver is verified by 43 Gb/s experiments in the… 
Multi-Modulus Blind Equalizations for Coherent Quadrature Duobinary Spectrum Shaped PM-QPSK Digital Signal Processing
A novel digital signal processing (DSP) scheme for quadrature duobinary (QDB) spectrum shaped polarization multiplexed quadrature phase shift keying (PM-QPSK) based on multi-modulus blind
Training Symbol-Based Equalization for Quadrature Duobinary PDM-FTN Systems
TLDR
Comparisons with the Tomlinson–Harashima precoding-based FTN systems illustrate that QDB is preferable when 4-QAM is utilized, and an excellent convergence performance is obtained using the proposed algorithm under different polarization alignment scenarios.
Adaptive quadrature-polybinary detection in super-Nyquist WDM systems.
TLDR
The transmission of 3-channel 112-Gbit/s PDM-QPSK signals at a 20-GHz channel spacing is demonstrated, which is detected as a quadratures four-level polybinary signal, with performance comparable to PDM 16-ary quadrature-amplitude modulation (16QAM) at the same bit rate.
Improved Quadrature Duobinary System Performance Using Multi-Modulus Equalization
Quadrature duobinary (QDB) signals can be generated from strongly filtered quadrature phase shift keying whose constellation becomes a 9-ary quadrature amplitude modulation. In this letter, the
Time-domain digital pre-equalization for band-limited signals based on receiver-side adaptive equalizers.
We theoretically and experimentally investigate a time-domain digital pre-equalization (DPEQ) scheme for bandwidth-limited optical coherent communication systems, which is based on feedback of
Sub-symbol-rate sampling for PDM-QPSK signals in super-Nyquist WDM systems using quadrature poly-binary shaping.
TLDR
The numerical simulations show that, for a software defined communication system, the level number of quadrature poly-binary modulation should be adjusted to achieve the optimal performance according to channel spacing, required OSNR and sampling rate restrictions of optics.
Pulse-Overlapping Super-Nyquist WDM System
In this paper, a pulse-overlapping super-Nyquist (Pol-SN) wavelength-division multiplexing (WDM) scheme is proposed to improve spectral efficiency of coherent optical transmission. In this scheme,
Performance Comparisons of DP-16QAM and Duobinary-Shaped DP-QPSK for Optical Systems With 4.1 Bit/s/Hz Spectral Efficiency
This paper, for the first time, experimentally presents direct comparisons of two 25 GHz spaced wavelength division multiplexing (WDM) systems using conventional dual-polarization (DP) 16-ary
Improved adaptive equalization with fixed step size CMA for DP-QPSK DWDM system
TLDR
This paper has exhibited with the help of numerical simulations that for the new process flow (FOE-AE-CPE) there is no need of complex variable step size approach in CMA algorithm and a fixed value of step size can also provide better system performance thereby making the process flow simpler in the DSP unit.
...
...

References

SHOWING 1-10 OF 23 REFERENCES
Quadrature Duobinary for High-Spectral Efficiency 100G Transmission
This paper proposes and analyzes a quadrature duobinary modulation format with coherent detection for high-spectral efficiency wavelength-division-multiplexing transmission systems at 112 Gb/s per
Spectrally Efficient Long-Haul Optical Networking Using 112-Gb/s Polarization-Multiplexed 16-QAM
We discuss the generation, wavelength-division-multiplexed (WDM) long-haul transmission, and coherent detection of 112-Gb/s polarization-division-multiplexed (PDM) 16-ary quadrature amplitude
Transmission of 32-Tb/s Capacity Over 580 km Using RZ-Shaped PDM-8QAM Modulation Format and Cascaded Multimodulus Blind Equalization Algorithm
In this paper, we propose a novel synthesizing method for high-speed 8-ary quadratic-amplitude modulation (QAM) optical signal generation using commercial optical modulators with binary electrical
Compensation of Quadrature Imbalance in an Optical QPSK Coherent Receiver
TLDR
This letter explores the Gram-Schmidt orthogonalization procedure (GSOP) for compensation of quadrature imbalance in an optical 90deg hybrid and demonstrates the improvement which can be achieved using the GSOP, including the impact of quantization in the digital coherent receiver.
Digital filters for coherent optical receivers.
TLDR
Using the analytical solution an upper bound on the number of taps required to compensate chromatic dispersion is obtained, with simulation revealing an improved bound of 2.2 taps per 1000ps/nm for 10.7GBaud data.
Enhanced digital coherent receiver for high spectral-efficiency dual-polarization quadrature duobinary systems
To enable linear impairment compensation and increase OSNR tolerance, a digital coherent receiver incorporating symbol-rate blind equalization and maximum-likelihood sequence detection is proposed
Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission
TLDR
A class of nonlinear estimation algorithms is described to estimate the unknown phase of a carrier which is fully modulated by m -ary PSK modulation, and the effect of quantization and finite read-only-memory implementation of the nonlinearity are determined by computer simulation.
Adaptive equalization
  • S. Qureshi
  • Computer Science
    Proceedings of the IEEE
  • 1985
TLDR
This tutorial paper gives an overview of the current state of the art in adaptive equalization and discusses the convergence and steady-state properties of least mean-square (LMS) adaptation algorithms, including digital precision considerations, and three classes of rapidly converging adaptive equalizer algorithms.
111-Gb/s PolMux-Quadrature Duobinary for Robust and Bandwidth Efficient Transmission
We investigate, by means of simulations, polarization-multiplexed (PolMux) quadrature duobinary (QDB) as a modulation format for transmitting 111-Gb/s signals with high spectral efficiency (SE) and
Shell partition-based joint blind equalization for QAM systems
TLDR
A shell partition-based CMA (SPCMA), a multi-modulus CMA based on the equalizer output power, in which decision boundaries are obtained by maximum likelihood (ML) estimation is proposed, showing the optimum performance for QAM constellations.
...
...