Replacing the Soft-Decision FEC Limit Paradigm in the Design of Optical Communication Systems

Alvarado, Alex; Agrell, Erik; Lavery, Domaniç; Maher, Robert; Bayvel, Polina

doi:10.1109/jlt.2015.2482718

Cited by 106 publications

(25 citation statements)

References 58 publications

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“…Moreover, the enhancement on the flexibility of transmission capacity indicates that PS bit loading technology is a more suitable and robust modulation method to take advantage of the channel capacity in the UVC solar-blind communication system with complex frequency-fading issues. We also observed that the NGMI values for all subcarriers are above 0.9 (allowing the use of a rate-0.858 FEC code), which means that using the concatenated code of 20% low-density parity-check (LDPC) and 6.25% staircase code as the FEC code can provide error-free transmission and achieve 10 −15 post-FEC BER [29]. The FEC code redundancy can be reduced even further using a binary rate-0.9 FEC code if it is developed in the future.…”

Section: Angle Of Viewmentioning

confidence: 82%

Gbit/s ultraviolet-C diffuse-line-of-sight communication based on probabilistically shaped DMT and diversity reception

Alkhazragi

Zou

et al. 2020

Opt. Express

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B. S. (2020). Gbit/s ultraviolet-C diffuse-line-of-sight communication based on probabilistically shaped DMT and diversity reception. Optics Express, 28(7), 9111. Abstract:We demonstrated a high-speed 1×2 single-input and multiple-output (SIMO) diffuseline-of-sight (diffuse-LOS) ultraviolet-C (UVC) solar-blind communication link over a distance of 5 meters. To approach the Shannon limit and improve the spectral efficiency, we implemented probabilistically shaped discrete multitone modulation. As compared to a single-input and single-output (SISO) counterpart, we observed significant improvement in the SIMO link in terms of the angle of view of the receiver and the immunity to emulated weather condition. A wide angle of view of ± 9°is achieved in the SIMO system, with up to a 1.09-Gbit/s achievable information rate (AIR) and a minimum value of 0.24 Gbit/s. Moreover, the bit error rate of the SIMO link in emulated foggy conditions is lowered significantly when compared to that of the SISO link. This work highlights the practicality of UVC communication over realistic distances and in turbulent environments to fill the research gap in high-speed, solar-blind communication.

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Section: Angle Of Viewmentioning

confidence: 82%

Gbit/s ultraviolet-C diffuse-line-of-sight communication based on probabilistically shaped DMT and diversity reception

Alkhazragi

Zou

et al. 2020

Opt. Express

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“…21. As a figure of merit, besides the pre FEC BER, we use the normalized generalized mutual information (NGMI), as it has been shown to provide consistent post FEC BER predictions across different conditions and modulation formats [23]. Considering the FEC overhead for LDPC codes concatenated with a staircase code [24], the NGMI of 0.88 and 0.92 shown in this figure corresponds to a overall rate of 0.81 and 0.85 respectively, meaning that for the gross data-rate of 199.80 Gb/s the net data-rates after FEC decoding will be 161.84 Gb/s and 169.83 Gb/s for the NGMI values of 0.88 and 0.92 respectively.…”

Section: Coherent Experimental Resultsmentioning

confidence: 99%

Multi-Band Photonic Integrated Wavelength Selective Switch

Kraemer

Nakamura

Hout

et al. 2021

J. Lightwave Technol.

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As fiber-optic systems turn toward multi-band transmission (MBT), exploiting the complete low loss window of optical fibers, novel optical components, able to operate in bands other than the conventional C-band, become necessary. In light of this, we report on a multi-band photonic integrated 1 × 2 wavelength selective switch (WSS) operating in the O, S, C and L-bands. The photonic integrated WSS presented in this work uses a folded arrayed-waveguide grating (AWG) as the filtering element, while the wideband operation of the thermo-optic switches allows the routing of the individual channels from those bands to any of the device output ports. The operation of the WSS is experimentally validated for different bands and modulation formats. Results show error-free operation with limited penalty with intensitymodulation direct-detection (IM/DD) non-return-to-zero on-off keying (NRZ-OOK

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“…10a. Note that generalized mutual information (GMI) 28 is used for accurately measuring the gain of NN-NLC for PS-64QAM format. Figure 10c compares the performance of NN-NLC and filtered-DBP with respect to the CDC only as a function of computation complexity.…”

Section: Resultsmentioning

confidence: 99%

Field and lab experimental demonstration of nonlinear impairment compensation using neural networks

Zhang¹,

Yaman²,

Nakamura

et al. 2019

Nat Commun

121

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Fiber nonlinearity is one of the major limitations to the achievable capacity in long distance fiber optic transmission systems. Nonlinear impairments are determined by the signal pattern and the transmission system parameters. Deterministic algorithms based on approximating the nonlinear Schrodinger equation through digital back propagation, or a single step approach based on perturbation methods have been demonstrated, however, their implementation demands excessive signal processing resources, and accurate knowledge of the transmission system. A completely different approach uses machine learning algorithms to learn from the received data itself to figure out the nonlinear impairment. In this work, a single-step, system agnostic nonlinearity compensation algorithm based on a neural network is proposed to pre-distort symbols at transmitter side to demonstrate ~0.6 dB Q improvement after 2800 km standard single-mode fiber transmission using 32 Gbaud signal. Without prior knowledge of the transmission system, the neural network tensor weights are constructed from training data thanks to the intra-channel cross-phase modulation and intra-channel four-wave mixing triplets used as input features.

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Replacing the Soft-Decision FEC Limit Paradigm in the Design of Optical Communication Systems

Cited by 106 publications

References 58 publications

Gbit/s ultraviolet-C diffuse-line-of-sight communication based on probabilistically shaped DMT and diversity reception

Gbit/s ultraviolet-C diffuse-line-of-sight communication based on probabilistically shaped DMT and diversity reception

Multi-Band Photonic Integrated Wavelength Selective Switch

Field and lab experimental demonstration of nonlinear impairment compensation using neural networks

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