Gui Tao, Zhou Gai, Lu Chao, Lau Alan Pak Tao, Wahls Sander
Opt Express. 2018 Oct 15;26(21):27978-27990. doi: 10.1364/OE.26.027978.
The recently proposed b-modulation method for nonlinear Fourier transform-based fiber-optic transmission offers explicit control over the duration of the generated pulses and therewith solves a longstanding practical problem. The currently used b-modulation however suffers from a fundamental energy barrier. There is a limit to the energy of the pulses, in normalized units, that can be generated. In this paper, we discuss how the energy barrier can be shifted by proper design of the carrier waveform and the modulation alphabet. In an experiment, it is found that the improved b-modulator achieves both a higher Q-factor and a further reach than a comparable conventional b-modulator. Furthermore, it performs significantly better than conventional approaches that modulate the reflection coefficient.
最近提出的用于基于非线性傅里叶变换的光纤传输的b调制方法，能够对所产生脉冲的持续时间进行明确控制，从而解决了一个长期存在的实际问题。然而，目前使用的b调制存在一个基本的能量障碍。以归一化单位衡量，能够产生的脉冲能量存在限制。在本文中，我们讨论了如何通过对载波波形和调制字母表进行适当设计来移动能量障碍。在一项实验中，发现改进后的b调制器比类似的传统b调制器实现了更高的Q因子和更远的传输距离。此外，它的性能明显优于调制反射系数的传统方法。
