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
Digital Four-Dimensional Transceiver IQ Characterization
TL;DR: In this paper , a 4D signal propagation model that takes into account inter-polarization IQ crosstalk was proposed to separate the 4D IQ characteristics of the transmitter and receiver from the coefficients of a single-layer complex 8×2 multiple-input multiple-output adaptive equalizer.
Proceedings ArticleDOI
Bit-Wise Achievable Information Rates for Probabilistically Shaped 64-QAM in the Presence of Polarization Dependent Loss
TL;DR: The impact of polarization dependent loss on probabilistically shaped and uniform DP 64-QAM for a bit-wise achievable information rate of 4.68 bits/2D symbol is quantified.
Proceedings ArticleDOI
Experimental Demonstration of Reach Increase for High Capacity Optical Transmission Systems by Probabilistic Shaping
TL;DR: In this paper, an experimental assessment of probabilistic shaping applied for long-haul optical transmission at high capacity is presented, where gains up to 39% have been observed compared to pragmatic QAM formats.
Proceedings ArticleDOI
DCI systems with ultra-low loss and low dispersion fiber
Xiaojun Liang,John D. Downie,Ming-Jun Li,Hui Su,Jason Hurley,James Himmelreich,Hao Dong,Sergejs Makovejs +7 more
TL;DR: In this article, the authors investigated the potential advantages of applying ultra-low loss and low dispersion fibers in DCI systems, and showed that the lower fiber attenuation reduces transceiver output power by 10 dB to achieve the same data capacity for 100 km DCI links.
Proceedings ArticleDOI
Interplay of Probabilistically Shaped Multilevel Coded Modulation and Fiber Nonlinearity Compensation
TL;DR: In this paper , the authors investigated transmission performance and decoding power consumption in coded modulation (CM) schemes and showed that probabilistically-shaped multilevel CM shows 21 or 9 times lower power consumption than uniform bit-interleaved CM with or without fiber nonlinearity compensation, respectively.
References
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Book
Information Theory and Reliable Communication
TL;DR: This chapter discusses Coding for Discrete Sources, Techniques for Coding and Decoding, and Source Coding with a Fidelity Criterion.
Journal ArticleDOI
Capacity Limits of Optical Fiber Networks
TL;DR: In this article, the capacity limit of fiber-optic communication systems (or fiber channels?) is estimated based on information theory and the relationship between the commonly used signal to noise ratio and the optical signal-to-noise ratio is discussed.
Journal ArticleDOI
Threshold Saturation via Spatial Coupling: Why Convolutional LDPC Ensembles Perform So Well over the BEC
TL;DR: The fundamental mechanism that explains why “convolutional-like” or “spatially coupled” codes perform so well is described, and it is conjecture that for a large range of graphical systems a similar saturation of the “dynamical” threshold occurs once individual components are coupled sufficiently strongly.
Journal ArticleDOI
Bandwidth Efficient and Rate-Matched Low-Density Parity-Check Coded Modulation
TL;DR: A new coded modulation scheme is proposed that operates within less than 1.1 dB of the AWGN capacity 1/2 log2(1 + SNR) at any spectral efficiency between 1 and 5 bits/s/Hz by using only 5 modes.