70.46 Tb/s Over 7,600 km and 71.65 Tb/s Over 6,970 km Transmission in C+L Band Using Coded Modulation With Hybrid Constellation Shaping and Nonlinearity Compensation

Cai, J.-X.; Batshon, Hussam G.; Mazurczyk, M.; Sinkin, O. V.; Wang, Ding; Paskov, Milen; Patterson, W.W.; Davidson, Carl; Corbett, P.C.; Wolter, G.; Hammon, Timothy E.; Bolshtyansky, Maxim; Foursa, D. G.; Pilipetskii, A.N.

doi:10.1109/jlt.2017.2757281

Cited by 68 publications

(23 citation statements)

References 24 publications

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“…Previous work used OHs ranging from about 4% to 10% in the case of fully pilot-based DSP and higher order formats [20][21][22]. For only pilot-based CPE, OHs of about 1-2% have been reported, depending on implementation, laser linewidth and transmission distance [23,24].…”

Section: Introductionmentioning

confidence: 99%

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

et al. 2019

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We present a low-complexity fully pilot-based digital signal processing (DSP) chain designed for high spectral efficiency optical transmission systems. We study the performance of the individual pilot algorithms in simulations before demonstrating transmission of a 51×24 Gbaud PM-64QAM superchannel over distances reaching 1000 km. We present an overhead optimization technique using the system achievable information rate to find the optimal balance between increased performance and throughput reduction from adding additional DSP pilots. Using the optimal overhead of 2.4%, we report 9.3 (8.3) bits/s/Hz spectral efficiency, or equivalently 11.9 (10.6) Tb/s superchannel throughput, after 480 (960) km of transmission over 80 km spans with EDFA-only amplification. Moreover, we show that the optimum overhead depends only weakly on transmission distance, concluding that back-to-back optimization is sufficient for all studied distances. Our results show that pilot-based DSP combined with overhead optimization can increase the robustness and performance of systems using advanced modulation formats while still maintaining state-of-the-art spectral efficiency and multi-Tb/s throughput.

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Section: Introductionmentioning

confidence: 99%

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

et al. 2019

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“…The contribution of higher order terms is non-negligible and, as we will show, its mitigation has the potential of notably improving performance. Various aspects of this issue have been dealt with in [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Equalization Methods for Out-of-Band Nonlinearity Mitigation in Fiber-Optic Communications

2019

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In recent years, it has been established that the adverse effects of nonlinear interference noise (NLIN) can be mitigated using adaptive equalization methods. As such, a wide variety of adaptive equalization methods have been used to treat nonlinearity, in different transmission scenarios. This paper reviews the principles of out-of-band nonlinearity mitigation using adaptive equalization. Statistical properties of NLIN that can be exploited for mitigation are discussed, as well as the cost and benefit of various types of equalizers. In particular we describe the equivalence between the NLIN and time-dependent inter-symbol-interference (ISI) and discuss ways in which the ISI coefficients can be characterized theoretically and experimentally. We further discuss the effectiveness of existing ISI mitigation algorithms, and explain the need for designing customized algorithms that take advantage of the various correlation properties characterizing the ISI coefficients. This paper is intended to be a practical reference for researchers who want to apply equalization algorithms or design new methods for nonlinearity mitigation.

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“…These developments paved the way for affordable worldwide telecommunications, and more specifically, the Internet, as we know it today. Current optical WDM systems and state-of-the-art experiments demonstrating transmission records may use hundreds of wavelengths in a single fiber core [6], requiring large stacks of lasers in the transmitters. In addition, the increased popularity of coherent intradyne links [7,8] with receivers needing local oscillator lasers and digital signal processing (DSP) have highlighted the need for coherent sources also in the receiver.…”

Section: Introductionmentioning

confidence: 99%

Frequency Comb-Based WDM Transmission Systems Enabling Joint Signal Processing

et al. 2018

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We review the use of optical frequency combs in wavelength-division multiplexed (WDM) fiber optic communication systems. In particular, we focus on the unique possibilities that are opened up by the stability of the comb-line spacing and the phase coherence between the lines. We give an overview of different techniques for the generation of optical frequency combs and review their use in WDM systems. We discuss the benefits of the stable line spacing of frequency combs for creating densely-packed optical superchannels with high spectral efficiency. Additionally, we discuss practical considerations when implementing frequency-comb-based transmitters. Furthermore, we describe several techniques for comb-based superchannel receivers that enables the phase coherence between the lines to be used to simplify or increase the performance of the digital carrier recovery. The first set of receiver techniques is based on comb-regeneration from optical pilot tones, enabling low-overhead self-homodyne detection. The second set of techniques takes advantage of the phase coherence by sharing phase information between the channels through joint digital signal processing (DSP) schemes. This enables a lower DSP complexity or a higher phase-noise tolerance.

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70.46 Tb/s Over 7,600 km and 71.65 Tb/s Over 6,970 km Transmission in C+L Band Using Coded Modulation With Hybrid Constellation Shaping and Nonlinearity Compensation

Cited by 68 publications

References 24 publications

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

Equalization Methods for Out-of-Band Nonlinearity Mitigation in Fiber-Optic Communications

Frequency Comb-Based WDM Transmission Systems Enabling Joint Signal Processing

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