Coherent Optical SIgnals for extremely high-capacity NEtworks (COSINE)

适用于极高容量网络的相干光信号 (COSINE)

• 批准号: EP/I012702/1
• 负责人: Alwyn Seeds
• 金额: $ 61.77万
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2011
• 资助国家: 英国
• 起止时间: 2011 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FI012702%2F1
• 关键词: Coherent; Optical; SIgnals; extremely; capacity

High-speed fibre-optic cables link cities, countries and continents across the globe, underpinning the Internet and the fixed and mobile phone networks that enable and enrich our lives today. Historically, increasing the overall data rate transmitted on a single optical fibre has dramatically reduced the cost of data transmission, and this is one factor that has enabled high data rate connections to be available at reasonable cost to end users. As services like social networking, music downloads, and video-on-demand capture the public's attention, they in turn create demand for greatly increased capacity on these networks. We can expect this cycle to continue as the installed fibre capacity is pushed to its limit.To achieve high transmission capacity on a single fibre, data is transmitted on several wavelength channels (wavelength division multiplexing, WDM). For compatibility with the components used in existing systems, and to avoid having to manage a huge number of wavelengths, it is preferable to increase the amount of data transmitted by increasing the data rate per channel, rather than by packing the wavelength channels closer and closer together. WDM networks with 40 Gb/s line rate are now being deployed, and there is currently considerable activity directed towards research and standardisation of 100 Gb/s Ethernet (100 GE) on a single wavelength.By extending the approach proposed for 100 GE by using advanced modulation schemes like those used in wireless communications, it may be possible to squeeze data transmission rates of several hundred Gb/s onto each wavelength, but the technological challenges posed will be significant. To move beyond this - towards 1 Tb/s (1,000 Gb/s) per wavelength - will require new techniques.In this work, we will investigate one approach to achieving this, which also eases some of the stringent demands on the optical transmitters and receivers imposed by current methods. Each wavelength channel will be divided into a number of sub-channels, and advanced modulation formats used to transmit data at a high rate in the narrow spectral band of each sub-channel. It will be necessary to generate the optical signals that define the sub-channels at the transmitter efficiently and cost-effectively, and to produce synchronised optical signals at the receiver to recover the data. To do so, we will generate all the sub-channels at the transmitter from a single laser that defines the frequency of the overall channel, and we will use one sub-channel to transmit information to allow an identical set of optical signals for channel demodulation to be created at the receiver. In this way, the sub-channels are synchronised (phase locked) to each other within the overall channel, as are the transmitter and receiver. This means that the sub-channels can be packed as closely together as possible and behave as a single unit, while recovering the data at the receiver is simplified.By this means we expect to increase the overall fibre transmission capacity to 135 Tb/s, more than an order of magnitude greater than the current state of the art for commercial long haul transmission systems. The work will mainly be carried out experimentally, investigating the key technical elements of the proposal in stages before combining them to show that the full scheme could deliver the anticipated increase in transmission capacity if fully implemented. Areas that will be examined include new ways of generating phase-locked sub-channels at the transmitter; methods for generating and synchronising the corresponding optical signals at the receiver; and modulation and de-modulation techniques giving high data rate transmission in a narrow spectral band. The experimental demonstration will be supported by computer simulations of the system, which will also allow new applications enabled by the approach - too advanced to be demonstrated experimentally at this stage - to be investigated.

高速光纤电缆连接着全球各城市、国家和大洲，支撑着互联网以及固定和移动电话网络，使我们今天的生活更加丰富多彩。从历史上看，提高单根光纤传输的总体数据速率大大降低了数据传输的成本，这是最终用户能够以合理的成本获得高数据速率连接的一个因素。随着社交网络、音乐下载和视频点播等服务吸引了公众的注意力，它们反过来又创造了对这些网络容量大幅增加的需求。随着已安装的光纤容量达到极限，我们可以预期这种循环将继续下去。为了在单根光纤上实现高传输容量，数据在几个波长通道上传输（波分复用，WDM）。为了与现有系统中使用的组件兼容，并避免必须管理大量波长，最好通过增加每个通道的数据速率来增加数据传输量，而不是通过将波长通道越来越紧密地打包在一起。目前正在部署40 Gb/s线路速率的WDM网络，目前有相当多的活动针对单一波长的100gb /s以太网（100ge）的研究和标准化。通过使用先进的调制方案（如无线通信中使用的调制方案）扩展提出的100ge方法，有可能将每个波长的数据传输速率压缩到几百Gb/s，但所带来的技术挑战将是重大的。要超越这一点——达到每波长1tb /s （1000gb /s）——将需要新的技术。在这项工作中，我们将研究一种实现这一目标的方法，这也减轻了当前方法对光发射器和接收器施加的一些严格要求。每个波长信道将被分成若干个子信道，并采用先进的调制格式在每个子信道的窄频谱带内以高速率传输数据。这将是必要的产生的光信号，定义子通道在发射机高效和经济有效，并产生同步的光信号在接收器恢复数据。为此，我们将从定义整个信道频率的单个激光器产生发射器上的所有子信道，并且我们将使用一个子信道传输信息，以便在接收器上创建一组相同的光信号用于信道解调。通过这种方式，子信道在整个信道内相互同步（锁相），发送器和接收器也是如此。这意味着子信道可以尽可能紧密地打包在一起，并作为一个单元运行，同时简化了在接收端恢复数据的过程。通过这种方式，我们期望将整体光纤传输容量提高到135tb /s，比目前商业长途传输系统的技术水平高出一个数量级。这项工作将主要进行实验，分阶段调查提案的关键技术要素，然后将它们结合起来，以表明如果全面实施，整个方案可以提供预期的传输容量增加。将研究的领域包括在发射机上产生锁相子信道的新方法；在接收器上产生和同步相应光信号的方法；以及调制和解调技术，在窄频谱带中实现高数据速率传输。实验演示将由该系统的计算机模拟来支持，这也将允许研究由该方法实现的新应用-在这个阶段过于先进而无法进行实验演示。

项目成果

Optical Injection Locking of a DFB laser to a 10-GHz Spaced Frequency Comb Signal

DFB 激光器光注入锁定 10 GHz 间隔频率梳信号

• DOI: 10.1364/fio.2013.ftu1b.6
• 发表时间: 2013
• 作者: Bordonalli A

Fast Optical Spectrum Estimation Using a Digital Coherent Receiver

使用数字相干接收器进行快速光谱估计

• DOI: 10.1049/cp.2013.1611
• 发表时间: 2013
• 作者: Hou-Man Chin

Polarization-insensitive single balanced photodiode coherent receiver for passive optical networks

用于无源光网络的偏振不敏感单平衡光电二极管相干接收器

• DOI: 10.1109/ecoc.2015.7341844
• 发表时间: 2015
• 作者: Erkilinc M

Spectrally-Efficient Single-Sideband Subcarrier-Multiplexed Quasi-Nyquist QPSK with Direct Detection

具有直接检测功能的频谱效率高的单边带副载波复用准奈奎斯特 QPSK

• DOI: 10.1049/cp.2013.1369
• 发表时间: 2013
• 作者: Erkilinc M

Monolithically Integrated Optical Phase Lock Loop for Microwave Photonics

• DOI: 10.1109/jlt.2014.2317941
• 发表时间: 2014-10-15
• 期刊: JOURNAL OF LIGHTWAVE TECHNOLOGY
• 影响因子: 4.7
• 作者: Balakier, Katarzyna;Fice, Martyn J.;Renaud, Cyril C.
• 通讯作者: Renaud, Cyril C.