25.4-Tb/s Transmission Over Transpacific Distances Using Truncated Probabilistically Shaped PDM-64QAM

Ruiz, Ivan Fernández de Jáuregui; Ghazisaeidi, Amirhossein; Sab, Omar Ait; Plantady, Philippe; Calsat, Alain; Dubost, S.; Schmalen, Laurent; Letellier, Vincent; Renaudier, Jérémie

doi:10.1109/jlt.2018.2791615

Cited by 23 publications

(4 citation statements)

References 27 publications

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“…where 𝐻 is the signal 4D entropy, R is the code rate or NGMI, M is the constellation size before constellation truncation [44], and 𝑃 is the pilot overhead. The log-likelihood ratios of the demodulated signals were calculated by a bit-metric decoder [45] to carry out decoding or evaluate NGMI.…”

Section: A Experimental Setupmentioning

confidence: 99%

Digital Inverse Multiplexing for Transmitters With Symbol Rates Over DAC Bandwidth Limit

Kawai,

Nakamura,

Kobayashi

et al. 2024

J. Lightwave Technol.

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Broadband signal generation technology plays a pivotal role in increasing the data rate of optical transceivers. To overcome the bandwidth limitation of digital-to-analog converters (DACs), techniques that generate a single broadband signal by multiplexing the outputs of multiple DACs in the analog domain have emerged as an early solution. Nonetheless, broadband signals experience impairments due to deviations from the ideal DAC multiplexing process. Utilizing a digital-analog symmetric modelling of the DAC multiplexing process, we propose an allelectronic bandwidth doubling scheme that incorporates an analog multiplexing device (bandwidth doubler) and a novel digital preprocessing scheme called digital inverse multiplexing. This can compensate for signal impairments due to the practical DAC multiplexing process. We confirmed that digital inverse multiplexing with a pre-distortion function can improve the signal-to-noise ratio by 3.7-dB in 132 Gbaud coherent signals utilizing an indium phosphide-based integrated bandwidth doubler and complementary metal-oxide semiconductor (CMOS) DACs with only 32 GHz bandwidth. With probabilistically-shaped 64-and 144-ary quadrature amplitude modulation signals, we achieved 1.47 Tb/s (11.1 bits/symbol) back-to-back signal generation and detection and 1.42 Tb/s (10.7 bits/symbol) transmission over a 100 km standard single-mode fiber. These results demonstrate the potential of our digital inverse multiplexing scheme to achieve ultra-broadband transmitters.

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Section: A Experimental Setupmentioning

confidence: 99%

Digital Inverse Multiplexing for Transmitters With Symbol Rates Over DAC Bandwidth Limit

Kawai,

Nakamura,

Kobayashi

et al. 2024

J. Lightwave Technol.

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show abstract

“…The higher shaping depth of the PS signals can bring larger shaping gain, but too large shaping depth will not be able to adapt well to the DSP algorithms at the receiving end. The truncated PS , was utilized to obtain a more suitable shaping depth and reduce the difficulty of some DSP algorithms, such as the constant modulus algorithm (CMA) equalization.…”

Section: Research Progress On Long-distance Transmissionmentioning

confidence: 99%

High-Speed Optical Fiber Communication in China

2022

ACS Photonics

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In the past decade, China has made great investments in studying photonics and photocommunication with larger communication capacity, better performance, and lower cost. After years of heavy investment, great progress has been made in academic research, manufacturing capabilities, and optical network scale. The number of papers written and published by researchers in China in the world’s top optical fiber communication conferences has increased year by year, accounting for about 10% of the total number of papers. These high-level articles show that scientists in China have made great strides in photonics research in devices, systems, and networks. On the other hand, photonics industrialization in China is getting more competitive with its large market scale and strong production capacity.

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“…In recent years, probabilistic shaping (PS) has become a hotspot in high data rate transmission [9,10]. By changing the probability of each constellation point to make a Gaussian-like constellation, PS could provide additional shaping gain to eliminate the gap between the Shannon capacity and system source entropy (SE).…”

Section: Introductionmentioning

confidence: 99%

On the Achievable Information Rate of Probabilistic Shaping QAM Order and Source Entropy in Visible Light Communication Systems

Zou

Zhao

et al. 2020

Applied Sciences

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Probabilistic shaping (PS) is a powerful tool that can realize a flexible data rate and high spectrum efficiency. However, the performance of PS is closely related to the quadrature amplitude modulation (QAM) order, source entropy (SE), normalized generalized mutual information (NGMI), and achievable information rate (AIR). In this paper, we investigated the relationship between PS QAM order, SE, NGMI, and AIR performance for the first time in the visible light communication (VLC) system. Under a specific signal-to-noise ratio (SNR), the PS QAM order and SE in this paper can realize a high AIR at a preset NGMI threshold with the lowest computation complexity, which is just 0.1 bit smaller than the highest AIR. Simulation and experimental results show that the NGMI fluctuates between only ±0.005 of the preset NGMI threshold, which proves that the scheme proposed in this paper is feasible.

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25.4-Tb/s Transmission Over Transpacific Distances Using Truncated Probabilistically Shaped PDM-64QAM

Cited by 23 publications

References 27 publications

Digital Inverse Multiplexing for Transmitters With Symbol Rates Over DAC Bandwidth Limit

Digital Inverse Multiplexing for Transmitters With Symbol Rates Over DAC Bandwidth Limit

High-Speed Optical Fiber Communication in China

On the Achievable Information Rate of Probabilistic Shaping QAM Order and Source Entropy in Visible Light Communication Systems

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