Experimental Demonstration of Space-Time Coding for MDL Mitigation in Few-Mode Fiber Transmission Systems

Amhoud, El Mehdi; Othman, Ghaya Rekaya-Ben; Bigot, Laurent; Song, Mengdi; Andresen, Esben Ravn; Labroille, Guillaume; Bigot-Astruc, Marianne; Jaouën, Yves

doi:10.1109/ecoc.2017.8345841

Cited by 22 publications

(14 citation statements)

References 4 publications

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“…While in [66], a mode-interleaving method was also presented to simplify STC schemes, which method could improve the transmission reach by 40% through simulation, as well as saving O M 2 computation complexity compared with conventional space-time block coding (STBC) method. The numerical conclusions of the benefits of STC were soon confirmed in [67] through experimental measurements, where lower BER at the same OSNR condition was achieved and the Qfactor in FMF transmission systems was improved by 3.4 dB in an absence of 10-dB MDL as shown in Figure 13a,b, respectively. Since STC with mode scramblers was shown to be a powerful tool to mitigate MDL effect, more efforts were adopted to explore possible techniques for further improved performance of the SDM systems that apply STC technique.…”

Section: Space-time Coding Technique (Stc)mentioning

confidence: 76%

Recent Progress on Novel DSP Techniques for Mode Division Multiplexing Systems: A Review

Yang

Peng

et al. 2021

Applied Sciences

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This paper provides an overview of latest progress on the novel advanced digital signal processing (DSP) techniques for long-haul mode division multiplexing (MDM) systems with high capacity. Space-division multiplexing (SDM) techniques have been developed for a period to increase the capacity of optical communication system by at least one order of magnitude through MDM techniques using few-mode fibers (FMFs) or multi-core multiplexing (MCM) using multi-core fibers (MCFs). The signals in MDM links are mainly impaired by the linear and nonlinear effects in FMFs, making DSP techniques become necessary to undo these impairments. In this paper, we not only review the advanced multiple-input multiple-output (MIMO) DSP techniques for compensating linear impairments in FMFs, but also enclose the state of the art of novel DSP techniques to deal with nonlinear effects. Firstly, we introduce the MIMO schemes for equalizing modal crosstalk and modal dispersion. Then, we focus on the fast tracking of time-varying (TV) channels in FMF links through frequency-domain (FD) recursive least square (RLS) algorithm. Besides, we also cover the mainstream DSP solutions for mode-dependent loss (MDL) and several possible methods to compensate nonlinearity in FMF. Moreover, artificial intelligence (AI) technologies are also discussed for its high nonlinearity tolerance and may bring a revolution in MDM systems on the process of channel equalization, link monitoring, etc. In the end, a brief conclusion and perspective will be provided.

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Section: Space-time Coding Technique (Stc)mentioning

confidence: 76%

Recent Progress on Novel DSP Techniques for Mode Division Multiplexing Systems: A Review

Yang

Peng

et al. 2021

Applied Sciences

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“…Another set of research works has been concerned with managing and reducing a chronic issue in OFDM systems: the Peak to Average Power Ratio (PAPR). For instance, the BER assessment of OFDM based image transmission system after using the companding technique for PAPR reduction has been elaborated in [39,40]. Similarly, [41] evaluated the effect tone reservation (TR) technique for PAPR reduction on the BER assessment of OFDMbased image transmission systems.…”

Section: Literature Reviewmentioning

confidence: 99%

Performance Analysis of Massive MIMO-OFDM System Incorporated with Various Transforms for Image Communication in 5G Systems

et al. 2022

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Modern-day applications of fifth-generation (5G) and sixth-generation (6G) systems require fast, efficient, and robust transmission of multimedia information over wireless communication medium for both mobile and fixed users. The hybrid amalgamation of massive multiple input multiple output (mMIMO) and orthogonal frequency division multiplexing (OFDM) proves to be an impressive methodology for fulfilling the needs of 5G and 6G users. In this paper, the performance of the hybrid combination of massive MIMO and OFDM schemes augmented with fast Fourier transform (FFT), fractional Fourier transform (FrFT) or discrete wavelet transform (DWT) is evaluated to study their potential for reliable image communication. The analysis is carried over the Rayleigh fading channels and M-ary phase-shift keying (M-PSK) modulation schemes. The parameters used in our analysis to assess the outcome of proposed versions of OFDM-mMIMO include signal-to-noise ratio (SNR) vs. peak signal-to-noise ratio (PSNR) and SNR vs. structural similarity index measure (SSIM) at the receiver. Our results indicate that massive MIMO systems incorporating FrFT and DWT can lead to higher PSNR and SSIM values for a given SNR and number of users, when compared with in contrast to FFT-based massive MIMO-OFDM systems under the same conditions.

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“…MDL creates an SNR imbalance of the received signals, and since the overall system performance is averaged over all received signals, then the performance is limited by the signal with the most degraded SNR. MDL was intensively studied for few-mode fibers, and multi-core fibers optical communications [27]- [29] and was shown to be the main performance limiting factor. In OAM FSO communications, the impact of MDL was only investigated in the case of laterally displaced OAM beams [12].…”

Section: A Oam Propagation In Turbulencementioning

confidence: 99%

“…Space-time coding was initially designed for MIMO wireless communication to bring coding gain and achieve a full-diversity at the transmitter side in a constantly varying channel. Recently, ST coding was also investigated for optical communication and was demonstrated to be efficient in mitigating non-unitary effects in polarization multiplexed systems [35] and also in few-mode fibers [27], [28]. The ST coding principle consists in transmitting a coded linear combination of modulated signals during several channel uses.…”

Section: Space-time Codingmentioning

confidence: 99%

OAM Mode Selection and Space–Time Coding for Atmospheric Turbulence Mitigation in FSO Communication

et al. 2019

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Orbital angular momentum (OAM) multiplexing has recently received considerable interest in free space optical (FSO) communications. Propagating OAM modes through free space may be subject to atmospheric turbulence (AT) distortions that cause intermodal crosstalk and power disparities between OAM modes. In this paper, we are interested in multiple-input-multiple-output (MIMO) coherent FSO communication systems using the OAM. We propose a selection criterion for the OAM modes to minimize the impact of the AT. To further improve the obtained performance, we propose a space-time (ST) coding scheme at the transmitter. Through numerical simulations of the error probability, we show that the penalty from AT is completely absorbed for the weak AT regime, and considerable coding gains are obtained in the strong AT regime. INDEX TERMS Orbital angular momentum (OAM), atmospheric turbulence, mode selection, space-time coding.

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Experimental Demonstration of Space-Time Coding for MDL Mitigation in Few-Mode Fiber Transmission Systems

Cited by 22 publications

References 4 publications

Recent Progress on Novel DSP Techniques for Mode Division Multiplexing Systems: A Review

Recent Progress on Novel DSP Techniques for Mode Division Multiplexing Systems: A Review

Performance Analysis of Massive MIMO-OFDM System Incorporated with Various Transforms for Image Communication in 5G Systems

OAM Mode Selection and Space–Time Coding for Atmospheric Turbulence Mitigation in FSO Communication

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