Journal ArticleDOI
Rate Adaptation and Reach Increase by Probabilistically Shaped 64-QAM: An Experimental Demonstration
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TLDR
A transmission system with adjustable data rate for single-carrier coherent optical transmission is proposed, which enables high-speed transmission close to the Shannon limit, and it is experimentally demonstrated that the optical transmission of probabilistically shaped 64-QAM signals outperforms the transmission reach of regular 16- QAM and regular 64-ZAM signals.Abstract:
A transmission system with adjustable data rate for single-carrier coherent optical transmission is proposed, which enables high-speed transmission close to the Shannon limit. The proposed system is based on probabilistically shaped 64-QAM modulation formats. Adjustable shaping is combined with a fixed-QAM modulation and a fixed forward-error correction code to realize a system with adjustable net data rate that can operate over a large reach range. At the transmitter, an adjustable distribution matcher performs the shaping. At the receiver, an inverse distribution matcher is used. Probabilistic shaping is implemented into a coherent optical transmission system for 64-QAM at 32 Gbaud to realize adjustable operation modes for net data rates ranging from 200 to 300 Gb/s. It is experimentally demonstrated that the optical transmission of probabilistically shaped 64-QAM signals outperforms the transmission reach of regular 16-QAM and regular 64-QAM signals by more than 40% in the transmission reach.read more
Citations
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Journal ArticleDOI
Fiber-optic transmission and networking: the previous 20 and the next 20 years [Invited]
TL;DR: Focusing on the optical transport and switching layer, aspects of large-scale spatial multiplexing, massive opto-electronic arrays and holistic optics-electronics-DSP integration, as well as optical node architectures for switching and multiplexed of spatial and spectral superchannels are covered.
Journal ArticleDOI
Performance Comparison of PS Star-16QAM and PS Square-Shaped 16QAM (Square-16QAM)
TL;DR: The star-shaped 16-ary quadrature amplitude modulation scheme shows superiority over the PS-Square-16QAM in terms of the BER improvement.
Journal ArticleDOI
On Probabilistic Shaping of Quadrature Amplitude Modulation for the Nonlinear Fiber Channel
TL;DR: In this paper, the effect of using a small number of input probability mass functions (PMFs) for a range of signal-to-noise ratios (SNRs), instead of optimizing the constellation shaping for each SNR, was investigated.
Journal ArticleDOI
800G DSP ASIC Design Using Probabilistic Shaping and Digital Sub-Carrier Multiplexing
Han Sun,Mehdi Torbatian,Mehdi Karimi,Robert Maher,Sandy Thomson,Mohsen Nader Tehrani,Yuliang Gao,Ales Kumpera,George Soliman,Aditya Kakkar,Mohammad Osman,Ziad A. El-Sahn,Clayton Doggart,Weikun Hou,Shailesh Sutarwala,Yuejian Wu,Mohammad Reza Chitgarha,Vikrant Lal,Huan-Shang Tsai,Scott Corzine,Jiaming Zhang,J. Osenbach,S. Buggaveeti,Zulfikar Morbi,Miguel Iglesias Olmedo,I. Leung,Xian Xu,Parmijit Samra,Vince Dominic,Steve Sanders,Mehrdad Ziari,Antonio Napoli,Bernhard Spinnler,Kuang-Tsan Wu,Parthiban Kandappan +34 more
TL;DR: This manuscript discusses the motivations for jointly utilizing transmission techniques such as probabilistic shaping and digital sub-carrier multiplexing in digital coherent optical transmissions systems and describes the key-building blocks of modern high-speed DSP-based transponders working at up to 800G per wave.
Journal ArticleDOI
Probabilistic Shaping and Forward Error Correction for Fiber-Optic Communication Systems
TL;DR: A layered PS-FEC architecture consisting of a PS encoder and an FEC encoder is introduced, of which probabilistic amplitude shaping is a practical instance and achievable PS encoding rates and FEC decoding rates are derived using information-theoretic arguments.
References
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Journal ArticleDOI
DMT Modulation With Adaptive Loading for High Bit Rate Transmission Over Directly Detected Optical Channels
Laia Nadal,Michela Svaluto Moreolo,Josep M. Fabrega,Annika Dochhan,Helmut Grießer,Michael Eiselt,Jorg-Peter Elbers +6 more
TL;DR: In this article, an adaptive cost-effective discrete multitone transponder (DMT) using direct detection (DD) is proposed for data center interconnections, where the Levin Campello margin adaptive (LC-MA) algorithm is applied to the Transponder digital signal processing modules to enhance fiber chromatic dispersion (CD) resilience, while achieving high data rate transmission.
Journal ArticleDOI
A Discrete-Time Model for Uncompensated Single-Channel Fiber-Optical Links
TL;DR: An analytical discrete-time model is introduced for single-wavelength polarization multiplexed nonlinear fiber-optical channels based on the symmetrized split-step Fourier method and it is shown that the analytical performance results are in close agreement with numerical results obtained using the SSFM for a symbol rate of 28 Gbaud and above.
Proceedings ArticleDOI
LDPC Coded Modulation with Probabilistic Shaping for Optical Fiber Systems
TL;DR: In this paper, an LDPC coded modulation scheme with probabilistic shaping, optimized interleavers and noniterative demapping is proposed, which increases the transmission distance by 8% compared to uniformly distributed input.
Journal ArticleDOI
Coded PDM-OFDM Transmission With Shaped 256-Iterative-Polar-Modulation Achieving 11.15-b/s/Hz Intrachannel Spectral Efficiency and 800-km Reach
T. H. Lotz,Xiang Liu,Sethumadhavan Chandrasekhar,Peter J. Winzer,H.F. Haunstein,Sebastian Randel,S. Corteselli,B. Zhu,D. W. Peckham +8 more
TL;DR: In this paper, the authors proposed a novel coded modulation scheme for coherent optical orthogonal frequency division multiplexing (CO-OFDM) to achieve high-speed transmission at spectral-efficiencies near the Shannon limit.
Proceedings ArticleDOI
Upper bound on the capacity of a cascade of nonlinear and noisy channels
TL;DR: An upper bound on the capacity of a cascade of nonlinear and noisy channels is presented and it is shown that the spectral efficiency of the cascade is at most log(1+SNR), where SNR is the receiver signal-to-noise ratio.