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Information Transmission Using the Nonlinear Fourier Transform, Part III: Spectrum Modulation

机译：使用非线性傅里叶变换的信息传输，第三部分：频谱调制

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摘要

Motivated by the looming capacity crunch in fiber-optic networks, information transmission over such systems is revisited. Among numerous distortions, interchannel interference in multiuser wavelength-division multiplexing (WDM) is identified as the seemingly intractable factor limiting the achievable rate at high launch power. However, this distortion and similar ones arising from nonlinearity are primarily due to the use of methods suited for linear systems, namely WDM and linear pulse-train transmission, for the nonlinear optical channel. Exploiting the integrability of the nonlinear Schrödinger (NLS) equation, a nonlinear frequency-division multiplexing (NFDM) scheme is presented, which directly modulates noninteracting signal degrees-of-freedom under NLS propagation. The main distinction between this and previous methods is that NFDM is able to cope with the nonlinearity, and thus, as the signal power or transmission distance is increased, the new method does not suffer from the deterministic crosstalk between signal components, which has degraded the performance of previous approaches. In this paper, emphasis is placed on modulation of the discrete component of the nonlinear Fourier transform of the signal and some simple examples of achievable spectral efficiencies are provided.
机译：由于光纤网络中迫在眉睫的能力紧缩，人们重新审视了此类系统上的信息传输。在众多失真中，多用户波分复用（WDM）中的通道间干扰被认为是限制高发射功率下可达到速率的看似棘手的因素。然而，这种失真和由非线性引起的类似失真主要是由于对非线性光信道使用了适合线性系统的方法，即WDM和线性脉冲序列传输。利用非线性薛定ding（NLS）方程的可积性，提出了一种非线性频分复用（NFDM）方案，该方案直接调制NLS传播下的非交互信号自由度。此方法与以前的方法之间的主要区别在于，NFDM能够应对非线性问题，因此，随着信号功率或传输距离的增加，新方法不会受到信号分量之间确定性串扰的影响，而串扰会降低信号强度。先前方法的性能。在本文中，重点放在信号的非线性傅里叶变换的离散分量的调制上，并提供了一些可实现的频谱效率的简单示例。

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