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IM/DD mode division multiplexing transmission enabled by machine learning-based linear and nonlinear MIMO equalization

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OPTICS COMMUNICATIONS 2021年 488卷 126832-126832页

作者： Zhu, Ziyue Chen, Jian Zhao, Mengxin Pang, Fufei Zhang, Qianwu Ye, Nan Shanghai Univ Key Lab Specialty Fiber Opt & Opt Access Networks Joint Int Res Lab Specialty Fiber Opt & Adv Commu Shanghai 200072 Peoples R China

We demonstrate two mode division multiplexing transmission systems through few-mode fiber by using two degenerate LP11 modes in high speed and low cost optical interconnection scenarios. Two novel MIMO equalizers based on machine learning are proposed and utilized to eliminate the impairments. In the ultra-low cost optical interconnection, the linear equalizer based on the elastic net can effectively reduce the bit error rate to the hard-decision forward error correction threshold with an extremely fast convergence speed. With the help of the nonlinear equalizer based on the neural network, high speed short-reach transmission has been achieved. By multiplexing two degenerate modes with the bit rate of 100 Gb/s/??????, 2 ? 100 Gb/s transmission of 30 G-class 1550 nm optical devices has been realized. Without the optical amplifier, the receiver sensitivity could be around-11 dBm in 2 ? 50 Gb/s transmission. This provides potential solutions for the future evolution of short-reach optical links.

关键词： Multiple Input Multiple Output Machine learning Mode division multiplexing intensity modulation with direct detection

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A novel asymmetrically clipped STTC for IM/DD MIMO atmospheric optical communications 17

A novel asymmetrically clipped STTC for IM/DD MIMO atmospher...

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17th International Conference on Optical Communications and Networks (ICOCN)

作者： Cao, Ming-hua Xiao, Bo Wang, Hui-qin Zhang, Yue Lanzhou Univ Technol Sch Comp & Commun Lanzhou 730050 Gansu Peoples R China State Grid Gansu Elect Power Co Informat Commun Co Lanzhou 730050 Gansu Peoples R China

ISBN: (数字)9781510627710

ISBN: (纸本)9781510627710

Conventional space-time trellis code cannot be directly applied to the intensity modulation/direct detection atmospheric optical transmission systems due to the complex and negative signal problem. An asymmetrically clipped space-time trellis code scheme is proposed, which combines the Hermitian symmetry of the inverse fast Fourier transform and the N/4 points to N points signal mapping to make the processed bipolar signal sequence satisfies the odd harmonic symmetry. The conversion of complex signal to positive real signal can then be achieved by clipping the bipolar signal sequence. Monte Carlo method is utilized to verify the feasibility of the proposed scheme. The results show that the proposed method can effectively resist the atmosphere scintillation.

关键词： Atmospheric optical communications multiple input multiple output Space-time trellis code intensity modulation with direct detection Asymmetrical clipping

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Asymmetrically Clipped Absolute Value Optical OFDM for intensity-Modulated direct-detection Systems

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2017年第17期35卷 3680-3691页

作者： Bai, Ruowen Wang, Qi Wang, Zhaocheng Tsinghua Univ Dept Elect Engn Tsinghua Natl Lab Informat Sci & Technol Beijing 100084 Peoples R China Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England

Orthogonal frequency division multiplexing (OFDM) is attracting increasing attention in optical communication systems, thanks to its inherent benefits such as high spectral efficiency and resistance to frequency-selective channels. In this paper, a novel energy and spectrally efficient scheme called asymmetrically clipped absolute value optical OFDM (AAO-OFDM) is proposed for intensity-modulated direct-detection systems. In AAO-OFDM, absolute value optical OFDM (AVO-OFDM) signals on the even subcarriers and asymmetrically clipped optical OFDM (ACOOFDM) signals on the odd subcarriers are combined for simultaneous transmission, which employs all the subcarriers requiring no dc biases. For AVO-OFDM scheme, the frequency symbols are first modulated on the even subcarriers, which are then fed into an inverse fast Fourier transform block. Afterward, the absolute values of the bipolar time-domain signals are taken to guarantee non-negativity, while their signs aremapped to the complex-valued symbols and modulated on the odd subcarriers. Since there remain unused odd subcarriers, other useful symbols can be modulated on them, which leads to the conventional ACO-OFDM scheme. At the receiver, the ACO-OFDM symbols on the odd subcarriers are demodulated first, which are reconstructed and removed from the received signals. Afterward, the remaining signals are utilized to detect the AVO-OFDM symbols with the aid of the demodulated sign symbols on the odd subcarriers. Theoretical analysis and simulation results show that AAO-OFDM has lower peak-to-average power ratio than other optical OFDM schemes, which makes it less sensitive to the nonlinearity of the optical devices. Furthermore, it achieves better bit error rate performance compared to its counterparts for the same spectral efficiency.

关键词： Energy efficiency intensity modulation with direct detection orthogonal frequency division multiplexing spectral efficiency

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A Hybrid PAPR Reduction Approach for the IM/DD Optical OFDM Communications

A Hybrid PAPR Reduction Approach for the IM/DD Optical OFDM ...

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IEEE/CIC International Conference on Communications in China (ICCC)

作者： Miao, Pu Jiang, Dongmei Wu, Lenan Chen, Peng Qingdao Univ Sch Elect & Informat Engn Qingdao Peoples R China Southeast Univ Sch Informat Sci & Engn Nanjing Peoples R China

ISBN: (纸本)9781538645024

In this paper, we propose a novel hybrid peak-to-average power ratio (PAPR) reduction approach combining multi-band Jacket matrix spreading (MB-JS) with the clipping and filtering for the orthogonal frequency division multiplexing (OFDM)-based optical communication systems. The PAPR performance of the proposed scheme is theoretical analyzed and the received signal-to-noise ratio (SNR) for each split sub-band are calculated. The 50 m step-index (SI) polymer optical fiber (POF) transmission based on offline processing is adopted as a special case to evaluate the system performance and then make comparisons with some other well known PAPR reduction techniques. With the help of this methodology, at least 2.57 dB PAPR reduction is obtained and 4 dBm power savings is achieved when compared to the original OFDM transmission. It is demonstrated that the proposed scheme can offer better system performance and make a favorable trade-off among the PAPR reduction, bit error rate and computational complexity.

关键词： intensity modulation with direct detection OFDM PAPR Jacket matrix spreading clipping and filtering

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Efficient IFFT Implementation in an ACO-OFDM Transmitter

Efficient IFFT Implementation in an ACO-OFDM Transmitter

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Opto-Electronics and Communications Conference (OECC) / Photonics Global Conference (PGC)

作者： Wang, Qibing Song, Binhuang Boland, David Corcoran, Bill Lowery, Arthur Monash Univ Electrophoton Lab Dept Elect & Comp Sys Engn Wellington Rd Clayton Vic 3800 Australia

A computationally efficient IFFT implementation for asymmetrically clipped optical OFDM transmitter is proposed and implemented in a Field-Programmable Gate Array. The overall computational complexity is reduced by 68... 详细信息

ISBN: (纸本)9781509062935

关键词： ACO-OFDM intensity modulation with direct detection IFFT implementation FPGA optical communication

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Compressed Sensing for Clipping Noise Cancellation in DCO-OFDM Systems based on Observation Interference Mitigation 9

Compressed Sensing for Clipping Noise Cancellation in DCO-OF...

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9th International Conference on Wireless Communication and Signal Processing (WCSP)

作者： Miao, Pu Qi, Chenhao Wu, Lenan Zhu, Bingcheng Chen, Kangjian Qingdao Univ Sch Elect & Informat Engn Qingdao Peoples R China Southeast Univ Sch Informat Sci & Engn Nanjing Jiangsu Peoples R China Nanjing Univ Posts & Telecommun Sch Commun Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781538620625

In this paper, we propose a modified clipping noise cancellation scheme using compressed sensing (CS) technique with observation interference mitigation for direct current biased optical (DCO) orthogonal frequency division multiplexing (OFDM) systems. The interference components in potential observations are theoretically analyzed and approximately estimated by exploiting the statistical model of the clipped DCO-OFDM signal. Then, the modified CS scheme eliminates the estimated interference from the potential observations, which can minimize the contamination influence of channel noise on CS recovery algorithm. In addition, a strategy jointly considering the compressed ratio and the decision noise is presented to generate the measurement matrix, which can sample the reliable data tones as final observations. With this scheme, the clipping noise in time domain can be effectively corrected and the bit error rate (BER) performance of the system is significantly improved. Simulation results demonstrate that the proposed scheme can perform well even under severe clipping conditions.

关键词： Peak-to-average power ratio clipping noise compressed sensing intensity modulation with direct detection OFDM

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Enhanced asymmetrically clipped DC biased optical OFDM for intensity-modulated direct-detection systems

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Journal of Communications and Information Networks 2017年第4期2卷 36-46页

作者： Ruowen Bai Jiaxuan Chen Tianqi Mao Zhaocheng Wang Tsinghua National Laboratory for Information Science and Technology(TNList) Department of Electronic EngineeringTsinghua UniversityBeijing 100084China

In this paper,we propose an EADO-OFDM(Enhanced Asymmetrically Clipped DC Biased Optical Orthogonal Frequency Division Multiplexing)method for IM/DD(intensity-Modulated directdetection)optical systems,in which the AV-DCO-OFDM(Absolute Valued DC Biased Optical OFDM)symbols on the even subcarriers and ACO-OFDM(Asymmetrically Clipped Optical OFDM)symbols on the odd subcarriers are combined for simultaneous ***,we discuss the PDF(Probability Density Function)and electrical SNR(Signal to Noise Ratio)of the symbols,which are utilized to estimate the BER(Bit Error Ratio)performance and overall performance of *** Monte Carlo simulation results have validated the theoretical analysis and have also confirmed the EADO-OFDM is attractive considering the following ***,EADO-OFDM is more energy efficient compared to the power-efficient DCO-OFDM(DC Biased Optical OFDM),since the required DC bias is smaller when appropriate constellation size combinations are *** addition,EADO-OFDM performs better than the conventional ADO-OFDM(Asymmetrically Clipped DC Biased Optical OFDM),because the absolute value operation causes no clipping distortion.

关键词： orthogonal frequency division multiplexing intensity modulation with direct detection optical wireless communications visible light communications absolute value operation

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Non-Linear Noise Contributions in Highly Dispersive Optical Transmission Systems

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FIBER AND INTEGRATED OPTICS 2016年第1期35卷 1-21页

作者： Matera, Francesco Fdn Ugo Bordoni Network Res Unit I-00161 Rome Italy

This article reports an analytical investigation, confirmed by numerical simulations, about the non-linear noise contribution in single-channel systems adopting generic modulation-detection formats in long links with both managed and unmanaged dispersion compensation and its impact in system performance. This noise contribution is expressed in terms of a pulse non-linear interaction length and permits a simple calculation of the Q-factor. Results point out the dependence of this non-linear noise on the number of amplifiers spans, N, according to the adopted chromatic dispersion compensation scheme, the modulation-detection format, and the signal baud rate. It is also shown how the effects of polarization multiplexing can be taken into account and how this single-channel non-linear noise contribution can be used in a wavelength-division multiplexing (WDM) environment.

关键词： 8 quadrature amplitude modulation differential binary phase-shift keying differential quadrature phase-shift keying intensity modulation with direct detection Kerr effect polarization-multiplexed Q-factor quadrature phase-shift keying wavelength-division multiplexing (WDM)

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Comparison of Orthogonal Frequency-Division Multiplexing and Pulse-Amplitude modulation in Indoor Optical Wireless Links

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IEEE TRANSACTIONS ON COMMUNICATIONS 2012年第1期60卷 153-163页

作者： Barros, Daniel J. F. Wilson, Sarah K. Kahn, Joseph M. Stanford Univ Dept Elect Engn EL Ginzton Lab Stanford CA 94305 USA Santa Clara Univ Dept Elect Engn Santa Clara CA 95053 USA

We evaluate the performance of three direct-detection orthogonal frequency-division multiplexing (OFDM) schemes in combating multipath distortion in indoor optical wireless links, comparing them to unipolar M-ary pulse-amplitude modulation (M-PAM) with minimum mean-square error decision-feedback equalization (MMSE-DFE). The three OFDM techniques are DC-clipped OFDM and asymmetrically clipped optical OFDM (ACO-OFDM) and PAM-modulated discrete multitone (PAM-DMT). We describe an iterative procedure to achieve optimal power allocation for DC-OFDM. For each modulation method, we quantify the received electrical SNR required at a given bit rate on a given channel, considering an ensemble of 170 indoor wireless channels. When using the same symbol rate for all modulation methods, M-PAM with MMSE-DFE has better performance than any OFDM format over a range of spectral efficiencies, with the advantage of (M-PAM) increasing at high spectral efficiency. ACO-OFDM and PAM-DMT have practically identical performance at any spectral efficiency. They are the best OFDM formats at low spectral efficiency, whereas DC-OFDM is best at high spectral efficiency. When ACO-OFDM or PAM-DMT are allowed to use twice the symbol rate of M-PAM, these OFDM formats have better performance than M-PAM. When channel state information is unavailable at the transmitter, however, M-PAM significantly outperforms all OFDM formats. When using the same symbol rate for all modulation methods, M-PAM requires approximately three times more computational complexity per processor than all OFDM formats and 63% faster analog-to-digital converters, assuming oversampling ratios of 1.23 and 2 for ACO-OFDM and M-PAM, respectively. When OFDM uses twice the symbol rate of M-PAM, OFDM requires 23% faster analog-to-digital converters than M-PAM but OFDM requires approximately 40% less computational complexity than M-PAM per processor.

关键词： Optical wireless infrared wireless visible light communications communications system performance multicarrier optical systems orthogonal frequency-division multiplexing power allocation intensity modulation with direct detection PAM-DMT ACO-OFDM OOK OFDM MMSE equalizers

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Numerical Investigation on Performance of In-Building Plastic Optical Fiber Transmission Systems and Role of Digital Television Broadcasting

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FIBER AND INTEGRATED OPTICS 2012年第4期31卷 237-249页

作者： Matera, Francesco Tiano, Stefania Settembre, Marina Fondazione Ugo Bordoni I-00100 Rome Italy SELEX ELSAG Rome Italy

This article reports a numerical investigation on the transmission performance of multilevel systems operating in building links encompassing step-index plastic optical fibers. For such an aim, a simplified model for the multimode fiber propagation is introduced. A sub-carrier multiplexing technique is also simulated to demonstrate the distribution of broadcasting television channels by adopting such fibers. The reported results show that a unique building network based on step-index plastic optical fibers is suitable to carry both Ethernet and broadcast TV signals in all rooms.

关键词： digital video broadcasting home network intensity modulation with direct detection plastic optical fiber quadrature amplitude modulation sub-carrier multiplexing TV

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