权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Optical coherent transmission with spectral efficient modulation and detection based on the non-linear Fourier transform

基于非线性傅里叶变换的具有光谱有效调制和检测的光相干传输

基本信息

批准号：
334668839
负责人：
Professor Dr.-Ing. Stephan ten Brink
金额：
--
依托单位：
Institut für Nachrichtenübertragung (INÜ)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/334668839?language=en
关键词：
Optical coherent transmission spectral efficient

项目摘要

This project aims at improving optical communications using solitons based on the non-linear Fourier transform (NFT). It is a fundamentally new approach that implicitly takes into account the Kerr-nonlinearity when modulating signals onto the optical fiber. In contrast, conventional methods consider nonlinearities as a source of interference that needs to be mitigated. Thus, the performance of conventional linear communication schemes with respect to reach and data rates is limited by the the fiber nonlinearities; increasing launch powers results in reduced spectral efficiency although the signal-to-noise ratio may still improve. It is, thus, promising and intuitive to account for the Kerr-nonlinearity already in the system design to achieve an overall improved communication quality, even when further increasing the launch power.This project focuses on the achievable rate (mutual information) of NFT-based communication links including modulation, channel and detection; the theoretical capacity of the nonlinear optical fiber channel is not further considered. The improved transmission quality shall be achieved by spectral efficient modulation of the discrete nonlinear spectrum consisting of eigenvalues and respective spectral amplitudes. The continuous spectrum is not further considered and is set to zero, so that "pure" soliton impulses remain to be studied. Although solitons have been investigated extensively in the past, their application to data communication with high spectral efficiency is still in its beginnings; further research on their fundamental properties and potential advantages over classic "Nyquist"-based signaling is required.To achieve spectral efficient modulation, different eigenvalue constellations as well as constellations of the spectral amplitude are to be considered; in particular, the influence of the various degrees of freedom on the time-bandwidth-product along the fiber needs to be studied. Such degrees of freedom are the real and imaginary part of the eigenvalues of a constellation, the multiplicity and arrangement of the eigenvalues per constellation, and the number of concurrently transmitted eigenvalues. Moreover, the modulation of signal points of the respective spectral amplitude (constellation size and arrangement of points) needs to be investigated. Also, the influence of noise, nonlinear soliton interaction as well as other real-world imperfections on the optimized constellations and pulse sequences needs to be studied. Finally, the properties of NFT-based transmission optimized for spectral efficiency shall be considered in the context of an optical communication system using wavelength division multiplex.

本项目旨在利用基于非线性傅里叶变换（NFT）的孤子来改善光通信。这是一种全新的方法，在将信号调制到光纤上时，隐含地考虑了克尔非线性。相比之下，常规方法将非线性视为需要减轻的干扰源。因此，传统线性通信方案在到达和数据速率方面的性能受到光纤非线性的限制;增加发射功率导致频谱效率降低，尽管信噪比仍然可以提高。因此，这是有前途的和直观的占克尔非线性已经在系统设计中，以实现整体改善的通信质量，即使进一步增加的发射power.This项目的重点是可实现的速率（互信息）的NFT为基础的通信链路，包括调制，信道和检测;的非线性光纤信道的理论容量没有进一步考虑。改进的传输质量应通过由特征值和相应的频谱幅度组成的离散非线性频谱的频谱有效调制来实现。连续谱不被进一步考虑，并被设置为零，所以“纯”孤子脉冲仍有待研究。虽然孤子在过去已经得到了广泛的研究，但它在高频谱效率数据通信中的应用还处于起步阶段，需要进一步研究它的基本特性以及相对于经典的基于Nyquist信号的潜在优势。特别是需要研究各种自由度对沿着光纤的时间带宽积的影响。这样的自由度是星座的本征值的真实的和虚部、每个星座的本征值的多重性和布置、以及同时传输的本征值的数量。此外，需要研究各个频谱幅度的信号点的调制（星座大小和点的布置）。此外，噪声，非线性孤子相互作用以及其他现实世界中的缺陷对优化星座和脉冲序列的影响需要研究。最后，应在使用波分复用的光通信系统的背景下考虑针对频谱效率优化的基于NFT的传输的性质。