Terabit-per-Second Coherent Optical Fiber Communications

太比特每秒相干光纤通信

• 批准号: 4736-2013
• 负责人: Cartledge, John
• 金额: $ 3.72万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=637227
• 关键词: Terabit; per; Second; Coherent; Optical

Optical fiber communication systems are used extensively throughout the global telecommunications network to provision virtually all services in the business, educational, healthcare and entertainment sectors. The rising demand for these services, many of which were unimaginable until recently, is driving the expansion of this network at dramatic rates and has pushed the per-channel bit rate of optical signals to 100 Gbit/s for state-of-the-art commercial systems. These systems are enabled by a fundamentally different approach based on coherent detection and digital signal processing. Next generation systems with a per-channel bit rate of 400 Gbit/s are currently being developed, and the need for a bit rate of 1 Tbit/s in the future is seen as certain. The research on coherent optical fiber communications reported to date has largely concentrated on performing the signal processing functions for a single channel in a conventional wavelength division multiplexed system that uses a fixed channel spacing of 50 GHz. To increase the per-channel bit rate to 1 Tbit/s, a strategy based on simply increasing the modulation rate is not applicable due to system design constraints and technology limitations. A bit rate of 1 Tbit/s can be achieved using a superchannel, which is comprised of multiple closely spaced optical subcarriers which collectively are considered as a single entity. Since superchannels are not compatible with current fixed-grid, wavelength division multiplexed systems, the concept of elastic optical networks has recently emerged as a means of accommodating channels with different modulation formats and symbol rates, and maximizing spectral efficiency. The proposed research embraces these recent innovations by focusing on 1 Tbit/s superchannels in elastic optical networks. The co-existence of such channels on a fiber and the distinct features of superchannels introduce new challenges in system design and performance evaluation. Three Ph.D. students will be trained through this research which addresses techniques for evaluating the system performance, digital signal processing algorithms that exploit the unique properties of the systems, and key subsystems required to support the experimentally intensive investigation.

光纤通信系统在整个全球电信网络中被广泛使用，以提供商业、教育、医疗保健和娱乐部门的几乎所有服务。对这些服务不断增长的需求，其中许多直到最近还无法想象，正在推动该网络以惊人的速度扩展，并已将最先进的商业系统的每通道光信号比特率推高至100Gbit/S。这些系统是由基于相干检测和数字信号处理的根本不同的方法实现的。每通道比特率为400Gbit/S的下一代系统目前正在开发中，未来对1Tbit/S的比特率的需求被认为是肯定的。到目前为止，关于相干光纤通信的研究主要集中在执行传统波分复用系统中的单个信道的信号处理功能，该系统使用50 GHz的固定信道间隔。为了将每通道的比特率提高到1Tbit/S，由于系统设计和技术限制，简单地提高调制速率的策略不适用。可以使用由共同被认为是单个实体的多个紧密间隔的光子载波组成的超信道来实现1Tbit/S的比特率。由于超信道与当前的固定网格、波分复用系统不兼容，弹性光网络的概念最近作为一种容纳具有不同调制格式和符号速率的信道并最大化频谱效率的手段而出现。本研究以弹性光网络中的1Tbit/S超信道为研究对象，充分利用了这些最新的研究成果。光纤上这些信道的共存和超级信道的独特特性给系统设计和性能评估带来了新的挑战。三名博士生将通过这项研究接受培训，该研究涉及评估系统性能的技术、利用系统独特特性的数字信号处理算法，以及支持实验密集调查所需的关键子系统。