Ultra-High-Capacity Optical Communications and Networking: Signal Processing for High-Data-Rate Optical Communications Systems

提案#0123409马里兰州-巴尔的摩县图拉伊州阿达利在过去的15年里，主干通信线路可以处理的最大数据速率增长了五个数量级。这一令人印象深刻的增长的一个关键使能技术是商用波分复用系统的出现，它使系统设计人员能够比过去更有效地填充可用的带宽。近年来，光纤传输线路中的物理损伤已成为限制可获得数据速率的主要因素。色散、光纤非线性、偏振效应和来自放大器的放大自发发射噪声都相互作用，限制了数据速率和/或传输距离。特别是，偏振模色散(PMD)引入了符号间和载波间干扰，并且是在安装的地面光纤系统中增加传输速率和距离的主要限制。虽然已经注意到，信号处理方法在减轻光通信系统中的偏振模色散和其他损伤方面具有很大的前景，但该领域仍处于起步阶段，目前该领域的活动仅限于没有考虑光域的特性的现成技术，因此无法真正利用信号处理所提供的可能性。通过引入两个互补研究领域的专业知识：通信的信号处理和光通信，本研究通过考虑光传输介质的物理特性来开发有效的电学领域(检测后)方法用于光通信。研究人员介绍了一类利用偏振分集的新型光通信接收器结构，并通过对物理现象的精确建模和他们开发的高效模拟技术来研究其性能。这两个研究小组在与拟议工作相关的两个领域都有专业知识：(1)光通信系统的理论和计算研究与建模；(2)通信误差补偿/缓解技术的发展。他们在过去几年中的合作证明了用这种方法开发的解决方案在光通信系统中显著提高性能的潜力。该项目的另一个重要好处是在两个研究界之间建立了有意义的交流，并强调了它们充分合作的重要性。这项研究还为更统一地看待通信系统提供了可能性。

Proposal #0123409Adali, TulayU of Maryland-Baltimore CountyWithin the last fifteen years, the maximum data rate that a backbone communications line can handle has grown by five orders of magnitude. A key enabling technology for this impressive growth has been theadvent of commercial wavelength-division-multiplexed systems that has allowed systems designers to fill the available bandwidth far more efficiently than in the past. Recently, the physical impairmentsin the optical fiber transmission lines have become the major factors limiting the obtainable data rates. The chromatic dispersion, fiber nonlinearities, polarization effects, and amplified spontaneousemission noise from the amplifiers, all interact limiting the data rates and/or transmission distances. Polarization mode dispersion (PMD), in particular, introduces intersymbol and intercarrier interference and is the primary limitation in increasing transmission rates and distances in installed terrestrial fiber systems. Though it has been noted that signal processing approaches hold great promise for mitigating PMD and other impairments in optical communications systems, the area is still in its infancy, and the current activity in the area is limited to ``off-the-shelf'' techniques that do not take into account characteristics of the optical domain, thus unable to truly take advantage of the possibilities that signal processing offer.By bringing in expertise from two complementary research areas: signal processing for communications and optical communications, this research develops effective electrical domain (post-detection) approaches for optical communications by taking into account the physical properties of the optical transmission medium. The investigators introduce a new class of receiver structures for optical communications that exploit polarization diversity and study their performance by accurate modeling of the physical phenomena and using efficient simulation techniques that they have developed.The two research groups have expertise in both areas relevant to the proposed work: (1) theoretical and computational study and modeling of optical communication systems and (2) development of errorcompensation/mitigation techniques for communications. Their collaboration within the last couple of years has demonstrated the potential of solutions developed with this approach for significant performance gains in optical communications systems. An important additional benefit of the project is establishing meaningful communication between the two research communities and the emphasis on the importance of their full collaboration. The research also offers the potential for a more unified view of communications systems.