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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

基本信息

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

项目摘要

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。可以说，突破当前的信道限制是数字光通信面临的最大挑战。以此为目标，这项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、先进的光子设计和机器学习等技术，使突破性发展成为可能，以确保未来有一个强大的通信基础设施。到目前为止，光通信已经能够满足日益增长的数据需求，同时降低成本和每比特的能量。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能力，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，节省成本和能源，避免即将耗尽的光纤容量，唯一的解决方案是新兴的空分复用(SDM)技术。它提供了使用多模和多芯光纤在一根光纤上传输信道的附加手段，从而提供了更广泛的信息管道。然而，SDM还没有找到一条可行的途径来访问如此高的信息容量。最先进的SDM收发器仅与少模/少芯光纤(~10条路径)兼容，因为需要在所有光纤路径上进行多路复用/解复用，以成功估计和解开路径串扰和走离。这完全违背了SDM的目的，新光纤的安装必须允许几十年的容量增长，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自SDM概念引入以来被研究界忽视的关键问题来转变SDM技术，以推动未来的光纤网络：光纤收发器必须经过&gt；100倍集成，才能实现多模/核心的好处。专注于能够进行数字空间调制的新型收发信机将使所有数据路径具有可扩展性，从而降低每比特的成本和能量消耗。在新的相干传输方案中的数字空间调制，即路径索引本身被用来携带信息，将从根本上开启到目前为止尚未探索的新的理论和实验可能性。这些新的收发信机将能够在新的信息论和非线性科学方法的指导下，通过新的空间调制格式和编码来利用线性和非线性区域中的多维信道特性。两个主要挑战是构建能够动态寻址海量多径光纤中的不同路径组(可能具有数十条路径)的高速数字空间调制器，以及开发适合于嵌入空间自适应收发信机的新的学习算法(在新的理论方法的指导下)，以达到非线性多维信道的最终容量。