利用相位共轭补偿光纤非线性的两种方法

Why compensating fibre nonlinearity will never meet capacity demands

Current research efforts are focussed on overcoming the apparent limits of communication in single mode optical fibre resulting from distortion due to fibre nonlinearity. It has been experimentally demonstrated that this Kerr nonlinearity limit is not a fundamental limit; thus it is pertinent to review where the fundamental limits of optical communications lie, and direct future research on this basis. This paper details recently presented results. The work herein briefly reviews the intrinsic limits of optical communication over standard single mode optical fibre (SMF), and shows that the emp…

Two-dimensional materials and the coherent control of nonlinear optical interactions

Deeply sub-wavelength two-dimensional films may exhibit extraordinarily strong nonlinear effects. Here we show that 2D films exhibit the remarkable property of a phase-controllable nonlinearity, i.e., the amplitude of the nonlinear polarisation wave in the medium can be controlled via the pump beam phase and determines whether a probe beam will "feel" or not the nonlinearity. This is in stark contrast to bulk nonlinearites where propagation in the medium averages out any such phase dependence. We perform a series of experiments in graphene that highlight some of the consequences of the optical…

基于机器学习的子带学习数字反向传播用于宽频光系统中非线性补偿

ML-assisted Subband Learned Digital Backpropagation for Nonlinearity Compensation in Wideband Optical Systems

本文提出一种子带学习数字反向传播框架，通过分解信号为多个子带，降低计算复杂度并提升宽频传输性能，优于传统数字反向传播方法。

解耦时间复用光 reservoir computing 中的记忆与非线性

Disentangling Memory and Nonlinearity in Time-Multiplexed Optical Reservoir Computing

该研究解耦时间复用光 reservoir computing 的记忆与非线性，采用无源线性光子 reservoir，发现非耦合虚拟节点加二次非线性的 reservoir 可适配部分任务，瞬态耦合与延迟反馈能提升计算能力。

CNN辅助的粒子群优化用于光传输系统中基于微扰模型的非线性补偿

CNN-Assisted Particle Swarm Optimization of a Perturbation-Based Model for Nonlinearity Compensation in Optical Transmission Systems

本文提出CNN与粒子群优化相结合的两阶段微扰系数计算方案，先以CNN最小化均方误差获得初值，再用粒子群优化最小化误码率，在16QAM长距离光传输实验中实现0.8 dB信噪比增益，并支持仅用接收符号学习系数。

相位共轭主振荡光纤放大器

Phase conjugated master oscillator fiber power amplifier

本研究提出利用光学相位共轭技术实现光纤激光器的窄线宽输出和SBS抑制，通过非线性谱展宽和相位共轭实现高功率、高亮度光纤激光系统。