Next-Generation Adaptive Nonlinear Equalization Algorithm Using Machine Learning for High-Speed Optical Communication

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optical Interaction Science".

Deadline for manuscript submissions: 15 June 2024 | Viewed by 879

Special Issue Editors

Guangdong Provincial Key Laboratory of Fire Science and Technology, Guangdong University of Technology, Guangzhou, China
Interests: optical communication; specifically in areas such as fiber transmission; transmitter optimization; nonlinear equalizers; signal processing

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Guest Editor
Peng Cheng Laboratory, Shenzhen, China
Interests: optical communications

Special Issue Information

Dear Colleagues,

High-spend data exchange between optical fiber communication systems is critical to support various ever-emerging Internet applications, including virtual reality, online shopping, and other services. Stimulated by exponential traffic growth, high-speed, large-capacity transmission systems have attracted increasing research interest worldwide. However, various impairments arising from both the transceivers and transmission link degrade the transmission performance and need to be mitigated for the purpose of maximizing the transmission capacity. Besides the traditional model-assisted equalization, machine learning based equalization schemes are considered promising in order to compensate for the transmission distortions because of their superior performance, as seen with the multilayer perceptron, long short-term memory neural network, and convolutional neural network.

The current Special Issue aims to report the scientific research that not only includes a nonlinear equalization method directly via machine learning or a machine learning-assisted nonlinear equalization method at the receiver-side, but also includes a transmitter-side pre-equalization method using machine learning. Above all, we encourage submissions that cover the integration of optical communication and machine learning.

Dr. Meng Xiang
Dr. Xueyang Li
Guest Editors

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Published Papers (1 paper)

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13 pages, 16643 KiB  
Article
Mitigating the Strong Inter-Core Crosstalk during MCF Transmissions by Neural-Network-Equalizer-Based MIMO-DSP and Approaches for Its Simplification
by Daohui Hu, Jiaqi Cai, Lin Sun, Junjie Xiong, Lin Ma, Bin Chen, Yi Cai and Gordon Ning Liu
Photonics 2024, 11(3), 196; https://doi.org/10.3390/photonics11030196 - 22 Feb 2024
Viewed by 735
Abstract
In this paper, we report our recent progress related to advanced digital signal processing (DSP) technologies to address the strong inter-core crosstalk (IC-XT) during multicore fiber (MCF) optical transmissions. MCF transmission technology has significant potential to break through the capacity crunch of single-mode [...] Read more.
In this paper, we report our recent progress related to advanced digital signal processing (DSP) technologies to address the strong inter-core crosstalk (IC-XT) during multicore fiber (MCF) optical transmissions. MCF transmission technology has significant potential to break through the capacity crunch of single-mode fiber (SMF) transmissions. However, strong coupling among cores, namely, inter-core crosstalk (IC-XT), is unavoidable for high-density space-division multiplexing (SDM) transmissions using MCFs with the standard cladding size. To deal with this issue, we propose some novel DSP structures to eliminate IC-XT with considerable simplicity, based on the neural network equalizer (NNE)-based multiple-input and multiple-output digital signal processing (MIMO-DSP). The traditional NNE-based MIMO-DSP method has the ability to process the coupled SDM tributaries transmitted over MCFs; however, it exhibits complexity limitations for practical implementations. The implementation complexity of the NNE-based method is mainly attributed to the time-consumption of the training process and the large weight (neurons) numbers of the equalizers. Thus, we propose two main approaches to simplify NNE-based MIMO-DSP for the practical implementation of MCF transmissions: (1) To reduce the time-consumption of the training process in NNE-based MIMO-DSP, the idea of transfer learning (TL) is employed for initializing the weights, resulting in the faster convergence of the equalizers. (2) IC-XT cancellation is performed along with MIMO-DSP; thus, the dimensionality of MIMO-DSP could be reduced. To validate the performance improvement of the proposed machine learning DSP methods, both simulations and experiments related to transmissions and reception over MCFs were conducted. The results indicate that the proposed novel DSP structures possess the advantages of reduced complexity and improved robustness to IC-XT, which is beneficial for the next-generation high-density SDM transmissions. Full article
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