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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Proceedings ArticleDOI
On shaping gain in the nonlinear fiber-optic channel
TL;DR: This work shows that a ball shaped input constellation may significantly reduce the nonlinear effects of fiber's nonlinearity and study the shaping gains in the fiber-optic channel to show that in certain scenarios the maximum gains may be higher than the 1.53dB ultimate shaping gain in linear additive white Gaussian noise channels.
Journal ArticleDOI
A Pragmatic Coded Modulation Scheme for High-Spectral-Efficiency Fiber-Optic Communications
TL;DR: A pragmatic coded modulation system is presented that incorporates signal shaping and exploits the excellent performance and efficient high-speed decoding architecture of staircase codes, and it is shown that digital backpropagation increases the achievable spectral efficiencies.
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
On achievable rates for long-haul fiber-optic communications.
TL;DR: In this paper, lower bounds on mutual information (MI) of long-haul optical fiber systems for hard-decision and softdecision decoding are studied. And the advantages of using MI over the prevailing Q-factor as a figure of merit of coded optical systems are also highlighted.
Proceedings ArticleDOI
Coded polarization-multiplexed iterative polar modulation (PM-IPM) for beyond 400 Gb/s serial optical transmission
TL;DR: In this article, a coded polarization-multiplexed iterative polar modulation (IPM-IPM) was proposed as an enabling coded-modulation scheme for beyond 400Gb/s serial optical transmission.