Beyond Exabit Optical Communications: from new devices, via new dimensions to new systems

超越 Exabit 光通信：从新设备，通过新维度到新系统

• 批准号: MR/T041218/1
• 负责人: Filipe Marques Ferreira
• 金额: $ 156.03万
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=MR%2FT041218%2F1
• 关键词: Beyond; Exabit; Optical; Communications; new

The aim of this fellowship is to develop disruptive approaches through theory and experiment to unlock the capacity of future information systems. To go beyond current channel limits is arguably the greatest challenge faced by digital optical communications. To target it, the proposed research will combine techniques from information theory, coding, higher-dimensional modulation formats, digital signal processing, advanced photonic design, and machine learning to make possible breakthrough developments to ensure a robust communications infrastructure beyond tomorrow.Optical communications have to-date been able to fulfil the ever-growing data demand whilst simultaneously reducing cost and energy-per bit. However, it is now recognised that systems are rapidly approaching the fundamental information capacity of current transmission technologies, a trend with potential negative impact on the economy and social progress. To meet future demands with prospective cost and energy savings and avoid the impending exhaust of fibre capacity, the only solution is the emergent technology of spatial division multiplexing (SDM). It provides much wider conduits of information by offering additional means for transporting channels over one single fibre, using multi-mode and multi-core fibres. However, SDM has not yet found a viable path to access this much higher information capacity. State-of-the-art SDM transceivers are only compatible with few-mode/few-core fibres (~10 paths) given the requirement to multiplex/demultiplex over all the fibre pathways to successfully estimate and unravel pathways crosstalk and walk-off. This completely defeats SDM's purpose, the installation of new fibres must allow for several decades of capacity growth to offset the high deployment costs of new cables.This fellowship envisages how to transform SDM technology to drive future optical networks by addressing the key issue overlooked by the research community since the introduction of SDM concepts: optical transceivers must undergo >100-fold integration to enable the benefits of multi-mode/core. Focus on new transceivers capable of digital space modulation will enable scalability of all data pathways to reduce the cost and energy-consumption per bit. Digital spatial modulation in novel coherent transmission schemes, i.e. the pathway index itself is used to carry information, will open fundamentally new theoretical and experimental possibilities up to now unexplored. These new transceivers will be capable of exploiting the multidimensional channel properties in the linear and nonlinear regimes through new spatial modulation formats and coding guided by new information theory and nonlinear science methods. Two main challenges are to construct a high-speed digital spatial modulator capable of dynamically addressing different groups of paths (potentially with tens of paths) in massive multi-path fibres and to develop new learning algorithms (guided by new theory methods) suitable of being embedded in spatial-adaptable transceivers to reach the ultimate capacity of nonlinear multi-dimensional channels.

该奖学金的目的是通过理论和实验开发颠覆性方法，以释放未来信息系统的能力。突破当前的信道限制可以说是数字光通信面临的最大挑战。为此，拟议的研究将结合信息论、编码、高维调制格式、数字信号处理、先进光子设计和机器学习等技术，以实现可能的突破性发展，以确保明天的强大通信基础设施。光通信已经迄今为止，我们已经能够满足不断增长的数据需求，同时降低每比特的成本和能耗。然而，现在人们认识到，系统正在迅速接近当前传输技术的基本信息容量，这一趋势对经济和社会进步具有潜在的负面影响。为了满足未来的需求并节省成本和能源，并避免光纤容量即将耗尽，唯一的解决方案是新兴的空分复用（SDM）技术。它通过使用多模和多芯光纤在一根光纤上提供额外的传输通道的方式，提供了更广泛的信息渠道。然而，SDM 尚未找到访问如此高的信息容量的可行途径。考虑到需要在所有光纤路径上进行复用/解复用以成功估计和消除路径串扰和走离，最先进的 SDM 收发器仅与少模/少芯光纤（约 10 条路径）兼容。这完全违背了SDM的目的，新光纤的安装必须允许数十年的容量增长，以抵消新电缆的高昂部署成本。该奖学金设想如何通过解决被忽视的关键问题来改造SDM技术以驱动未来的光网络自引入 SDM 概念以来，研究界认为：光收发器必须经过 100 倍以上的集成才能发挥多模/核心的优势。重点关注能够进行数字空间调制的新型收发器，将实现所有数据路径的可扩展性，从而降低每比特的成本和能耗。新型相干传输方案中的数字空间调制，即路径索引本身用于携带信息，将从根本上开启迄今为止尚未探索的新的理论和实验可能性。这些新型收发器将能够通过新的空间调制格式和新信息论和非线性科学方法指导的编码来利用线性和非线性机制中的多维信道特性。两个主要挑战是构建一个能够动态寻址大规模多径光纤中不同路径组（可能有数十条路径）的高速数字空间调制器，并开发适合于嵌入空间自适应收发器以达到非线性多维通道的极限容量。

项目成果

On a Scalable Path for Multimode SDM Transmission

多模SDM传输的可扩展路径

• DOI: 10.1109/jlt.2023.3308777
• 发表时间: 2024-01-01
• 期刊: Journal of Lightwave Technology
• 影响因子: 4.7
• 作者: F. A. Barbosa;Filipe M. Ferreira
• 通讯作者: Filipe M. Ferreira

On the advantages of principal modes for multimode SDM transmission systems

多模SDM传输系统主要模式的优点

• 发表时间: 2023
• 作者: Fabio A. Barbosa

First Experimental Mach-Zehnder FOPA for Polarization- and Wavelength-Division-Multiplexed Signals

第一个用于偏振和波分复用信号的实验性 Mach-Zehnder FOPA

• DOI: http://dx.10.1109/ecoc52684.2021.9605811
• 发表时间: 2021
• 作者: Bessin F

Scaling Spatial Multiplexing with Principal Modes

使用主模式扩展空间复用

• DOI: 10.1109/ipc53466.2022.9975662
• 发表时间: 2022-11-01
• 期刊: 2022 IEEE Photonics Conference (IPC)
• 作者: F. A. Barbosa;F. Ferreira
• 通讯作者: F. Ferreira

Intelligent self calibration tool for adaptive mode multiplexers using multiplane light conversion

使用多平面光转换的自适应模式多路复用器的智能自校准工具

• 发表时间: 2022
• 作者: D Pohle