摘要翻译：
预计光接入网的需求将达到每用户多Gb/s。然而，目前在客户驻地的光网络单元中使用的直接检测接收机技术的有限性能限制了数据速率/用户。因此，相干接入网络的概念近年来引起了人们的关注，因为该技术提供了高接收机灵敏度、固有频率选择性和线性场检测，从而能够完全补偿线性信道损伤。然而，传统（双极化数字）相干接收机的复杂性至今阻止了它们引入接入网。因此，为了在ONU中利用相干技术的好处，需要适合在ONU中实现的低复杂度相干接收机。本文首次将最近提出的低复杂度相干（即与偏振无关的Alamouti编码外差）接收机从最小接收灵敏度的角度与以前报道的五种接收机设计进行了比较，并详细讨论了它们的优点和局限性。结果表明，基于Alamouti编码的接收方法在要求最低硬件复杂度的同时，允许每比特传输最少的光子数(PPB)（理想系统仿真下的下限为15.5PPB)。它还表现出与当前部署的直接检测接收机相当的复杂性，这些接收机通常需要>1000 ppb。最后，给出了用这些接收机实验获得的接收机灵敏度和传输距离的比较。使用Alamouti编码接收机在最高比特率下的最高频谱效率和最长传输距离被报道，这也是迄今为止唯一一个在全系统双向传输中被证明的接收机。
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英文标题：
《Comparison of Low Complexity Coherent Receivers for UDWDM-PONs
  ($\lambda$-to-the-user)》
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作者：
M. Sezer Erk{\i}l{\i}n\c{c}, Domani\c{c} Lavery, Kai Shi, Benn C.
  Thomsen, Robert I. Killey, Seb J. Savory, and Polina Bayvel
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最新提交年份：
2018
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分类信息：

一级分类：Electrical Engineering and Systems Science        电气工程与系统科学
二级分类：Signal Processing        信号处理
分类描述：Theory, algorithms, performance analysis and applications of signal and data analysis, including physical modeling, processing, detection and parameter estimation, learning, mining, retrieval, and information extraction. The term "signal" includes speech, audio, sonar, radar, geophysical, physiological, (bio-) medical, image, video, and multimodal natural and man-made signals, including communication signals and data. Topics of interest include: statistical signal processing, spectral estimation and system identification; filter design, adaptive filtering / stochastic learning; (compressive) sampling, sensing, and transform-domain methods including fast algorithms; signal processing for machine learning and machine learning for signal processing applications; in-network and graph signal processing; convex and nonconvex optimization methods for signal processing applications; radar, sonar, and sensor array beamforming and direction finding; communications signal processing; low power, multi-core and system-on-chip signal processing; sensing, communication, analysis and optimization for cyber-physical systems such as power grids and the Internet of Things.
信号和数据分析的理论、算法、性能分析和应用，包括物理建模、处理、检测和参数估计、学习、挖掘、检索和信息提取。“信号”一词包括语音、音频、声纳、雷达、地球物理、生理、（生物）医学、图像、视频和多模态自然和人为信号，包括通信信号和数据。感兴趣的主题包括：统计信号处理、谱估计和系统辨识；滤波器设计；自适应滤波/随机学习；（压缩）采样、传感和变换域方法，包括快速算法；用于机器学习的信号处理和用于信号处理应用的机器学习；网络与图形信号处理；信号处理中的凸和非凸优化方法；雷达、声纳和传感器阵列波束形成和测向；通信信号处理；低功耗、多核、片上系统信号处理；信息物理系统的传感、通信、分析和优化，如电网和物联网。
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英文摘要：
  It is predicted that demand in optical access networks will reach multi-Gb/s per user. However, the limited performance of the direct detection receiver technology currently used in the optical network units at the customers' premises restricts data rates/user. Therefore, the concept of coherent-enabled access networks has attracted attention in recent years, as this technology offers high receiver sensitivity, inherent frequency selectivity, and linear field detection enabling the full compensation of linear channel impairments. However, the complexity of conventional (dual-polarisation digital) coherent receivers has so far prevented their introduction into access networks. Thus, to exploit the benefits of coherent technology in the ONUs, low complexity coherent receivers, suitable for implementation in ONUs, are needed. In this paper, the recently proposed low complexity coherent (i.e., polarisation-independent Alamouti-coding heterodyne) receiver is, for the first time, compared in terms of its minimum receiver sensitivity with five previously reported receiver designs, including a detailed discussion on their advantages and limitations. It is shown that the Alamouti-coding based receiver approach allows the lowest number of photons per bit (PPB) transmitted (with a lower bound of 15.5 PPB in an ideal system simulations) whilst requiring the lowest optical receiver hardware complexity. It also exhibits comparable complexity to the currently deployed direct-detection receivers, which typically require >1000 PPB. Finally, a comparison of experimentally achieved receiver sensitivities and transmission distances using these receivers is presented. The highest spectral efficiency and longest transmission distance at the highest bit rate reported using the Alamouti-coding receiver, which is also the only one, to date, to have been demonstrated in a full system bidirectional transmission.
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PDF链接：
https://arxiv.org/pdf/1711.02043