Machine Learning Applied to Optical Communication Systems

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optical Communication and Network".

Deadline for manuscript submissions: 10 November 2024 | Viewed by 9640

Special Issue Editors


E-Mail Website
Guest Editor
Peng Cheng Laboratory, Shenzhen 518055, China
Interests: optics communications; signal processing; modulation/coding; machine learning
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Peng Cheng Laboratory, Shenzhen 518055, China
Interests: optical communications; short-reach optical interconnects; digital signal processing; machine learning

Special Issue Information

Dear Colleagues,

Optical communication utilizing light for high-speed data transmission has played a vital role in bringing forth the digital age. However, as the demand for data continues to grow, there is a pressing need to further increase the capacity, scalability, and reliability of optical communication systems. New technologies are of vital importance in supporting next-generation optical transport networks. Accompanied by the fast development of computing resources, in recent years, we have witnessed the growing trend of using machine learning (ML) in various applications. ML has found its place in a number of industries, and its application in optical transmission systems is one of the current hot topics to revolutionize traditional approaches in the field of optical communications.

ML algorithms such as the support vector machine, Gaussian mixture model, different types of neural networks, reinforcement learning, etc., have strong ability to analyze vast amounts of data, extract patterns, and make intelligent predictions. These properties make ML extremely suitable for applications in the optical communication domain, which is facing similar problems. By harnessing the power of ML, optical communication issues such as optical performance monitoring, modulation format identification, device imperfection estimation, channel modelling, and linear/nonlinear equalization can potentially be addressed in an efficient manner. On the other hand, optical communication is also well-suited for ML applications since it can easily generate and collect huge amounts of transmission data for ML to build complex mathematical models efficiently.

This Special Issue aims to dive into the exciting intersection of ML and optical communication systems to foster a deeper understanding of how ML can revolutionize optical communications and how optical communications can facilitate ML processing. We encourage researchers to contribute to this hot topic and present their state-of-the-art research or review articles. Potential directions include but are not limited to ML theory and design, performance evaluation, complexity analysis, hardware implementation, etc., for different types of optical communication systems (to solve the aforementioned problems) shown below:

  • ML in short-reach transmission systems (IM/DD or self-coherent);
  • ML in long-haul transmission systems (coherent);
  • ML in optical access networks (e.g., passive optical networks);
  • ML in radio-over-fiber systems;
  • ML in optical wireless communications;
  • ML in visible-light communication systems;
  • ML in underwater optical communications;
  • ML in optical vehicle-to-vehicle communication systems;
  • ML in laser communications in space;
  • ML in chaotic optical communications.

Dr. Jinlong Wei
Dr. Zhaopeng Xu
Guest Editors

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Keywords

  • machine learning
  • neural network
  • deep learning
  • optical communications
  • digital signal processing
  • optical performance monitoring
  • modulation format identification
  • device imperfection estimation
  • channel modelling
  • linear and nonlinear equalization

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Published Papers (9 papers)

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Research

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19 pages, 3480 KiB  
Article
The Stability Optimization of Indoor Visible 3D Positioning Algorithms Based on Single-Light Imaging Using Attention Mechanism Convolutional Neural Networks
by Wenjie Ji, Lianxin Hu, Xun Zhang, Jiongnan Lou, Hongda Chen and Zefeng Wang
Photonics 2024, 11(9), 794; https://doi.org/10.3390/photonics11090794 - 26 Aug 2024
Viewed by 452
Abstract
In recent years, visible light positioning (VLP) techniques have been gaining popularity in research. Among them, the scheme of using a camera as a receiver provides a low-cost, high-precision positioning capability and easy integration with existing multimedia devices and robots. However, the pose [...] Read more.
In recent years, visible light positioning (VLP) techniques have been gaining popularity in research. Among them, the scheme of using a camera as a receiver provides a low-cost, high-precision positioning capability and easy integration with existing multimedia devices and robots. However, the pose changes of the receiver can lead to image distortion and light displacement, significantly increasing positioning errors. Addressing these errors is crucial for enhancing the accuracy of VLP. Most current solutions rely on gyroscopes or Inertial Measurement Units (IMUs) for error optimization, but these approaches often add complexity and cost to the system. To overcome these limitations, we propose a 3D positioning algorithm based on an attention mechanism convolutional neural network (CNN) aimed at reducing the errors caused by angles. We designed experiments and comparisons within a rotation angle range of ±15 degrees. The results demonstrate that the average error for 2D positioning is within 5.74 cm and the height error is within 3.92 cm, and the average error for 3D positioning is within 6.8 cm. Among the four groups of experiments for 3D positioning, compared to the traditional algorithm, the improvements were 7.931 cm, 15.569 cm, 6.004 cm, and 16.506 cm. The experiments indicate that it can be applied to high-precision visible light positioning for single-light imaging. Full article
(This article belongs to the Special Issue Machine Learning Applied to Optical Communication Systems)
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13 pages, 1037 KiB  
Article
Neural Network Equalisation for High-Speed Eye-Safe Optical Wireless Communication with 850 nm SM-VCSELs
by Isaac N. O. Osahon, Ioannis Kostakis, Denise Powell, Wyn Meredith, Mohamed Missous, Harald Haas, Jianming Tang and Sujan Rajbhandari
Photonics 2024, 11(8), 772; https://doi.org/10.3390/photonics11080772 - 20 Aug 2024
Viewed by 482
Abstract
In this paper, we experimentally illustrate the effectiveness of neural networks (NNs) as non-linear equalisers for multilevel pulse amplitude modulation (PAM-M) transmission over an optical wireless communication (OWC) link. In our study, we compare the bit-error-rate (BER) performances of two decision [...] Read more.
In this paper, we experimentally illustrate the effectiveness of neural networks (NNs) as non-linear equalisers for multilevel pulse amplitude modulation (PAM-M) transmission over an optical wireless communication (OWC) link. In our study, we compare the bit-error-rate (BER) performances of two decision feedback equalisers (DFEs)—a multilayer-perceptron-based DFE (MLPDFE), which is the NN equaliser, and a transversal DFE (TRDFE)—under two degrees of non-linear distortion using an eye-safe 850 nm single-mode vertical-cavity surface-emitting laser (SM-VCSEL). Our results consistently show that the MLPDFE delivers superior performance in comparison to the TRDFE, particularly in scenarios involving high non-linear distortion and PAM constellations with eight or more levels. At a forward error correction (FEC) threshold BER of 0.0038, we achieve bit rates of ~28 Gbps, ~29 Gbps, ~22.5 Gbps, and ~5 Gbps using PAM schemes with 2, 4, 8, and 16 levels, respectively, with the MLPDFE. Comparably, the TRDFE yields bit rates of ~28 Gbps and ~29 Gbps with PAM-2 and PAM-4, respectively. Higher PAM levels with the TRDFE result in BERs greater than 0.0038 for bit rates above 2 Gbps. These results highlight the effectiveness of the MLPDFE in optimising the performance of SM-VCSEL-based OWC systems across different modulation schemes and non-linear distortion levels. Full article
(This article belongs to the Special Issue Machine Learning Applied to Optical Communication Systems)
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16 pages, 744 KiB  
Article
Impact of Optical-to-Electrical Conversion on the Design of an End-to-End Learning RGB-LED-Based Visible Light Communication System
by Jose Martin Luna-Rivera, Jose Rabadan, Julio Rufo, Carlos A. Gutierrez, Victor Guerra and Rafael Perez-Jimenez
Photonics 2024, 11(7), 616; https://doi.org/10.3390/photonics11070616 - 28 Jun 2024
Viewed by 469
Abstract
Visible Light Communication (VLC) is emerging as a promising technology to meet the demands of fifth-generation (5G) networks and the Internet of Things (IoT). This study introduces a novel RGB-LED-based VLC system design that leverages autoencoders, addressing the often overlooked impact of optical-to-electrical [...] Read more.
Visible Light Communication (VLC) is emerging as a promising technology to meet the demands of fifth-generation (5G) networks and the Internet of Things (IoT). This study introduces a novel RGB-LED-based VLC system design that leverages autoencoders, addressing the often overlooked impact of optical-to-electrical (O/E) conversion efficiency. Unlike traditional methods, our autoencoder-based system not only improves communication performance but also mitigates the negative effects of O/E conversion. Through comprehensive simulations, we show that the proposed autoencoder structure enhances system robustness, achieving superior performance compared to traditional VLC systems. By quantitatively assessing the impact of O/E conversion—a critical aspect previously overlooked in the literature—our work bridges a crucial gap in VLC research. This contribution not only advances the understanding of VLC systems but also provides a strong foundation for future enhancements in 5G and IoT connectivity. Full article
(This article belongs to the Special Issue Machine Learning Applied to Optical Communication Systems)
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13 pages, 4178 KiB  
Article
Regeneration of 200 Gbit/s PAM4 Signal Produced by Silicon Microring Modulator (SiMRM) Using Mach–Zehnder Interferometer (MZI)-Based Optical Neural Network (ONN)
by Tun-Yao Hung, David W. U Chan, Ching-Wei Peng, Chi-Wai Chow and Hon Ki Tsang
Photonics 2024, 11(4), 349; https://doi.org/10.3390/photonics11040349 - 10 Apr 2024
Viewed by 1204
Abstract
We propose and demonstrate a Mach–Zehnder Interferometer (MZI)-based optical neural network (ONN) to classify and regenerate a four-level pulse-amplitude modulation (PAM4) signal with high inter-symbol interference (ISI) generated experimentally by a silicon microing modulator (SiMRM). The proposed ONN has a multiple MZI configuration [...] Read more.
We propose and demonstrate a Mach–Zehnder Interferometer (MZI)-based optical neural network (ONN) to classify and regenerate a four-level pulse-amplitude modulation (PAM4) signal with high inter-symbol interference (ISI) generated experimentally by a silicon microing modulator (SiMRM). The proposed ONN has a multiple MZI configuration achieving a transmission matrix that resembles a fully connected (FC) layer in a neural network. The PAM4 signals at data rates from 160 Gbit/s to 240 Gbit/s (i.e., 80 GBaud to 120 GBaud) were experimentally generated by a SiMRM. As the SiMRM has a limited 3-dB modulation bandwidth of ~67 GHz, the generated PAM4 optical signal suffers from severe ISI. The results show that soft-decision (SD) forward-error-correction (FEC) requirement (i.e., bit error rate, BER < 2.4 × 10−2) can be achieved at 200 Gbit/s transmission, and the proposed ONN has nearly the same performance as an artificial neural network (ANN) implemented using traditional computer simulation. Full article
(This article belongs to the Special Issue Machine Learning Applied to Optical Communication Systems)
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20 pages, 12421 KiB  
Article
Exploration of Four-Channel Coherent Optical Chaotic Secure Communication with the Rate of 400 Gb/s Using Photonic Reservoir Computing Based on Quantum Dot Spin-VCSELs
by Dongzhou Zhong, Tiankai Wang, Yujun Chen, Qingfan Wu, Chenghao Qiu, Hongen Zeng, Youmeng Wang and Jiangtao Xi
Photonics 2024, 11(4), 309; https://doi.org/10.3390/photonics11040309 - 27 Mar 2024
Cited by 1 | Viewed by 922
Abstract
In this work, we present a novel four-channel coherent optical chaotic secure communication (COCSC) system, incorporating four simultaneous photonic reservoir computers in tandem with four coherent demodulation units. We employ a quartet of photonic reservoirs that capture the chaotic dynamics of four polarization [...] Read more.
In this work, we present a novel four-channel coherent optical chaotic secure communication (COCSC) system, incorporating four simultaneous photonic reservoir computers in tandem with four coherent demodulation units. We employ a quartet of photonic reservoirs that capture the chaotic dynamics of four polarization components (PCs) emitted by a driving QD spin-VCSEL. These reservoirs are realized utilizing four PCs of a corresponding reservoir QD spin-VCSEL. Through these four concurrent photonic reservoir structures, we facilitate high-quality wideband-chaos synchronization across four pairs of PCs. Leveraging wideband chaos synchronization, our COCSC system boasts a substantial 4 × 100 GHz capacity. High-quality synchronization is pivotal for the precise demasking or decoding of four distinct signal types, QPSK, 4QAM, 8QAM and 16QAM, which are concealed within disparate chaotic PCs. After initial demodulation via correlation techniques and subsequent refinement through a variety of digital signal processing methods, we successfully reconstruct four unique baseband signals that conform to the QPSK, 4QAM, 8QAM and 16QAM specifications. Careful examination of the eye diagrams, bit error rates, and temporal trajectories of the coherently demodulated baseband signals indicates that each set of baseband signals is flawlessly retrieved. This is underscored by the pronounced eye openings in the eye diagrams and a negligible bit error rate for each channel of baseband signals. Our results suggest that delay-based optical reservoir computing employing a QD spin-VCSEL is a potent approach for achieving multi-channel coherent optical secure communication with optimal performance and enhanced security. Full article
(This article belongs to the Special Issue Machine Learning Applied to Optical Communication Systems)
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11 pages, 635 KiB  
Article
Enhanced PON and AMCC Joint Transmission with GMM-Based Probability Shaping Techniques
by Haipeng Guo, Chuanchuan Yang, Zhangyuan Chen and Hongbin Li
Photonics 2024, 11(3), 227; https://doi.org/10.3390/photonics11030227 - 29 Feb 2024
Viewed by 889
Abstract
In ITU-T standards, auxiliary management and control channels (AMCCs), as defined, facilitate the rapid deployment and efficient management of wavelength division multiplexing passive optical network (WDM-PON) systems. The super-imposition of an AMCC introduces additional interference to a PON signal, resulting in the degradation [...] Read more.
In ITU-T standards, auxiliary management and control channels (AMCCs), as defined, facilitate the rapid deployment and efficient management of wavelength division multiplexing passive optical network (WDM-PON) systems. The super-imposition of an AMCC introduces additional interference to a PON signal, resulting in the degradation of the performance of the overall transmission. In prior research, we proposed employing a Gaussian mixture model (GMM) to fit a baseband-modulated AMCC signal. Following the analysis of the interference model and the distribution characteristics of received signal errors, we propose a combined optimization method for a transmitter and receiver in this paper. This method, grounded in probabilistic shaping (PS) techniques, optimizes the probability distribution of the transmitted signal based on the AMCC interference model, with the objective of reducing the error rate in PON signal transmission. We have validated this approach within a 50G-PON experimental system by utilizing PAM4 modulation. The experimental results demonstrate the effectiveness of this method for mitigating the impact of baseband-modulated AMCC, thereby reducing the error rate in PON signal transmission. The approach presented in this paper can further minimize the performance degradation introduced by baseband-modulated AMCC in WDM-PON systems, enhancing the efficiency of WDM-PON deployment. Full article
(This article belongs to the Special Issue Machine Learning Applied to Optical Communication Systems)
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Review

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24 pages, 5342 KiB  
Review
Advanced Neural Network-Based Equalization in Intensity-Modulated Direct-Detection Optical Systems: Current Status and Future Trends
by Zhaopeng Xu, Tonghui Ji, Qi Wu, Weiqi Lu, Honglin Ji, Yu Yang, Gang Qiao, Jianwei Tang, Chen Cheng, Lulu Liu, Shangcheng Wang, Junpeng Liang, Zhongliang Sun, Linsheng Fan, Jinlong Wei and William Shieh
Photonics 2024, 11(8), 702; https://doi.org/10.3390/photonics11080702 - 28 Jul 2024
Viewed by 773
Abstract
Intensity-modulated direct-detection (IM/DD) optical systems are most widely employed in short-reach optical interconnects due to their simple structure and cost-effectiveness. However, IM/DD systems face mixed linear and nonlinear channel impairments, mainly induced by the combination of square-law detection and chromatic dispersion, as well [...] Read more.
Intensity-modulated direct-detection (IM/DD) optical systems are most widely employed in short-reach optical interconnects due to their simple structure and cost-effectiveness. However, IM/DD systems face mixed linear and nonlinear channel impairments, mainly induced by the combination of square-law detection and chromatic dispersion, as well as the utilization of low-cost non-ideal transceivers. To solve this issue, recent years have witnessed a growing trend of introducing machine learning technologies such as neural networks (NNs) into IM/DD systems for channel equalization. NNs usually present better system performance than traditional approaches, and various types of NNs have been investigated. Despite the excellent system performance, the associated high computational complexity is a major drawback that hinders the practical application of NN-based equalizers. This paper focuses on the performance and complexity trade-off of NNs employed in IM/DD systems, presenting a systematic review of the current status of NN-based equalizers as well as a number of effective complexity reduction approaches. The future trends of leveraging advanced NN in IM/DD links are also discussed. Full article
(This article belongs to the Special Issue Machine Learning Applied to Optical Communication Systems)
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23 pages, 517 KiB  
Review
Machine Learning in Short-Reach Optical Systems: A Comprehensive Survey
by Chen Shao, Elias Giacoumidis, Syed Moktacim Billah, Shi Li, Jialei Li, Prashasti Sahu, André Richter, Michael Faerber and Tobias Kaefer
Photonics 2024, 11(7), 613; https://doi.org/10.3390/photonics11070613 - 28 Jun 2024
Viewed by 631
Abstract
Recently, extensive research has been conducted to explore the utilization of machine learning (ML) algorithms in various direct-detected and (self)-coherent short-reach communication applications. These applications encompass a wide range of tasks, including bandwidth request prediction, signal quality monitoring, fault detection, traffic prediction, and [...] Read more.
Recently, extensive research has been conducted to explore the utilization of machine learning (ML) algorithms in various direct-detected and (self)-coherent short-reach communication applications. These applications encompass a wide range of tasks, including bandwidth request prediction, signal quality monitoring, fault detection, traffic prediction, and digital signal processing (DSP)-based equalization. As a versatile approach, ML demonstrates the ability to address stochastic phenomena in optical systems networks where deterministic methods may fall short. However, when it comes to DSP equalization algorithms such as feed-forward/decision-feedback equalizers (FFEs/DFEs) and Volterra-based nonlinear equalizers, their performance improvements are often marginal, and their complexity is prohibitively high, especially in cost-sensitive short-reach communications scenarios such as passive optical networks (PONs). Time-series ML models offer distinct advantages over frequency-domain models in specific contexts. They excel in capturing temporal dependencies, handling irregular or nonlinear patterns effectively, and accommodating variable time intervals. Within this survey, we outline the application of ML techniques in short-reach communications, specifically emphasizing their utilization in high-bandwidth demanding PONs. We introduce a novel taxonomy for time-series methods employed in ML signal processing, providing a structured classification framework. Our taxonomy categorizes current time-series methods into four distinct groups: traditional methods, Fourier convolution-based methods, transformer-based models, and time-series convolutional networks. Finally, we highlight prospective research directions within this rapidly evolving field and outline specific solutions to mitigate the complexity associated with hardware implementations. We aim to pave the way for more practical and efficient deployment of ML approaches in short-reach optical communication systems by addressing complexity concerns. Full article
(This article belongs to the Special Issue Machine Learning Applied to Optical Communication Systems)
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17 pages, 4198 KiB  
Review
Machine Learning for Self-Coherent Detection Short-Reach Optical Communications
by Qi Wu, Zhaopeng Xu, Yixiao Zhu, Yikun Zhang, Honglin Ji, Yu Yang, Gang Qiao, Lulu Liu, Shangcheng Wang, Junpeng Liang, Jinlong Wei, Jiali Li, Zhixue He, Qunbi Zhuge and Weisheng Hu
Photonics 2023, 10(9), 1001; https://doi.org/10.3390/photonics10091001 - 31 Aug 2023
Cited by 8 | Viewed by 2034
Abstract
Driven by emerging technologies such as the Internet of Things, 4K/8K video applications, virtual reality, and the metaverse, global internet protocol traffic has experienced an explosive growth in recent years. The surge in traffic imposes higher requirements for the data rate, spectral efficiency, [...] Read more.
Driven by emerging technologies such as the Internet of Things, 4K/8K video applications, virtual reality, and the metaverse, global internet protocol traffic has experienced an explosive growth in recent years. The surge in traffic imposes higher requirements for the data rate, spectral efficiency, cost, and power consumption of optical transceivers in short-reach optical networks, including data-center interconnects, passive optical networks, and 5G front-haul networks. Recently, a number of self-coherent detection (SCD) systems have been proposed and gained considerable attention due to their spectral efficiency and low cost. Compared with coherent detection, the narrow-linewidth and high-stable local oscillator can be saved at the receiver, significantly reducing the hardware complexity and cost of optical modules. At the same time, machine learning (ML) algorithms have demonstrated a remarkable performance in various types of optical communication applications, including channel equalization, constellation optimization, and optical performance monitoring. ML can also find its place in SCD systems in these scenarios. In this paper, we provide a comprehensive review of the recent progress in SCD systems designed for high-speed optical short- to medium-reach transmission links. We discuss the diverse applications and the future perspectives of ML for these SCD systems. Full article
(This article belongs to the Special Issue Machine Learning Applied to Optical Communication Systems)
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