Experimental Study of Nonlinearity Tolerant Modulation Formats Based on LDPC Coded Non-uniform Signaling

Qu, Zhen; Lin, Changyu; Liu, Tao; Djordjević, Ivan B.

doi:10.1364/ofc.2017.w1g.7

Cited by 10 publications

(6 citation statements)

References 4 publications

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“…Since it may be easier to have a common standard agreement among network service providers if the PS scheme is used for constellation shaping, PS should be more suitable to be used in data center networks. PS can be realized using Huffman coding [28,29], many-to-one mapping [30], and a constant composition distribution matcher (CCDM) [31,32]. Given that a CCDM can flexibly generate fractional entropy without systematic error, the optical industry is more inclined to apply a CCDM-based PS scheme.…”

Section: Introductionmentioning

confidence: 99%

Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications

et al. 2019

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M-ary pulse-amplitude modulation (PAM) meets the requirements of data center communication because of its simplicity, but coarse entropy granularity cannot meet the dynamic bandwidth demands, and there is a large capacity gap between uniform formats and the Shannon limit. The dense wavelength division multiplexing (DWDM) system is widely used to increase the channel capacity, but low spectral efficiency of the intensity modulation/direct detection (IM/DD) solution restricts the throughput of the modern DWDM data center networks. Probabilistic shaping distribution is a good candidate to offer us a fine entropy granularity and efficiently reduce the gap to the Shannon limit, and Nyquist pulse shaping is widely used to increase the spectral efficiency. We aim toward the joint usage of probabilistic shaping and Nyquist pulse shaping with low-density parity-check (LDPC) coding to improve the bit error rate (BER) performance of 8-PAM signal transmission. We optimized the code rate of the LDPC code and compared different Nyquist pulse shaping parameters using simulations and experiments. We achieved a 0.43 dB gain using Nyquist pulse shaping, and a 1.1 dB gain using probabilistic shaping, while the joint use of probabilistic shaping and Nyquist pulse shaping achieved a 1.27 dB gain, which offers an excellent improvement without upgrading the transceivers.

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Section: Introductionmentioning

confidence: 99%

Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications

et al. 2019

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“…Huffman coding and optimal constellation design techniques are applied to generate the quadrature amplitude modulation (QAM) formats, i.e., 5/9-QAM formats. Meanwhile, the GF(5) based LDPC coding is implemented for 5-QAM symbol sequences, and GF(32) based LDPC coding is implemented for 9-QAM symbol sequences [30,31]. Unlike the classical OAM multiplexed FSO links, where all spatial mode channels are centrally aligned, binary FEC coding is used for error correction.…”

Section: Introductionmentioning

confidence: 99%

Orbital Angular Momentum Multiplexed Free-Space Optical Communication Systems Based on Coded Modulation

Qu¹,

Djordjević²

2018

Applied Sciences

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In this paper, we experimentally investigate the turbulence mitigation methods in free-space optical communication systems based on orbital angular momentum (OAM) multiplexing.To study the outdoor atmospheric turbulence environment, we use an indoor turbulence emulator. Adaptive optics, channel coding, Huffman coding combined with low-density parity-check (LDPC) coding, and spatial offset are used for turbulence mitigation; while OAM multiplexing and wavelength-division multiplexing (WDM) are applied to boost channel capacity.

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“…Geometric shaping (GS) and probabilistic amplitude shaping (PAS) have been extensively studied to bridge the gap to the Shannon limit [1][2][3][4]. GS scheme suffers non-Gray mapping penalty when binary forward error correction (FEC) codes are applied [1].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Probabilistic-Geometric Shaping in Optical Communication Systems

Djordjević

2018

2018 IEEE Photonics Conference (IPC)

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Experimental Study of Nonlinearity Tolerant Modulation Formats Based on LDPC Coded Non-uniform Signaling

Cited by 10 publications

References 4 publications

Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications

Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications

Orbital Angular Momentum Multiplexed Free-Space Optical Communication Systems Based on Coded Modulation

Hybrid Probabilistic-Geometric Shaping in Optical Communication Systems

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