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.

光纤通信系统广泛应用于全球电信网络，为商业、教育、医疗保健和娱乐部门提供几乎所有的服务。对这些服务不断增长的需求，其中许多直到最近才被想象到，正在推动这个网络以惊人的速度扩展，并将最先进的商业系统的光信号的每通道比特率提高到100 Gbit/s。这些系统是通过基于相干检测和数字信号处理的根本不同的方法实现的。目前正在开发每通道比特率为400 Gbit/s的下一代系统，未来对比特率为1 Gbit/s的需求是肯定的。迄今为止，有关相干光纤通信的研究主要集中在传统波分复用系统中单信道的信号处理功能，该系统使用固定的50 GHz信道间隔。为了将每通道比特率提高到1 Tbit/s，由于系统设计的限制和技术的限制，简单地提高调制速率的策略是不适用的。使用超级信道可以实现1 Tbit/s的比特率，超级信道由多个紧密间隔的光学子载波组成，这些子载波共同被认为是一个单一的实体。由于超级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出现，作为容纳不同调制格式和符号速率的信道的手段，并最大化频谱效率。提出的研究通过关注弹性光网络中的1tbit /s超级通道来拥抱这些最新的创新。这些通道在光纤上的共存以及超级通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，利用系统独特属性的数字信号处理算法，以及支持实验密集研究所需的关键子系统。