PHz-wide spectral interference through coherent plasma-induced fission of higher-order solitons

Multimode soliton collisions in graded-index optical fibers

In this work, we unveil the unique complex dynamics of multimode soliton interactions in graded-index optical fibers through simulations and experiments. By generating two multimode solitons from the fission of an input femtosecond pulse, we examine the evolution of their Raman-induced red-shift when the input pulse energy grows larger. Remarkably, we find that the output red-shift of the trailing multimode soliton may be reduced, so that it accelerates until it collides with the leading multimode soliton. As a result of the inelastic collision, a significant energy transfer occurs between the…

Soliton compression and supercontinuum spectra in nonlinear diamond photonics

We numerically explore synthetic crystal diamond for realizing novel light sources in ranges which are up to now difficult to achieve with other materials, such as sub-10-fs pulse durations and challenging spectral ranges. We assess the performance of on-chip diamond waveguides for controlling light generation by means of nonlinear soliton dynamics. Tailoring the cross-section of such diamond waveguides allows to design dispersion profiles with custom zero-dispersion points and anomalous dispersion ranges exceeding an octave. Various propagation dynamics, including supercontinuum generation by…

Soliton control in fading optical lattices

We predict new phenomena, such as soliton steering and soliton fission, in optical lattices that fade away exponentially along the propagation direction. Such lattices, featuring tunable decay rates, arise in photorefractive crystals in the wavelength range 360-400 nm. We show that the predicted phenomena offer different opportunities for soliton control.

Energy conversion efficiency from a high order soliton to fundamental solitons in presence of Raman scattering

We formulate the energy conversion efficiency from a high-order soliton to fundamental solitons by including the influence of interpulse Raman scattering in the fission process. The proposed analytical formula agrees closely with numerical results of the generalized nonlinear Schrodinger equation as well as to experimental results, while the resulting formulation significantly alters the energy conversion efficiency predicted by the Raman-independent inverse scattering method. We also calculate the energy conversion efficiency in materials of different Raman gain profiles such as silica, ZBLAN…

Dynamics of Soliton Cascades in Fiber Amplifiers

We study numerically the formation of cascading solitons when femtosecond optical pulses are launched into a fiber amplifier with less energy than required to form a soliton of equal duration. As the pulse is amplified, cascaded fundamental solitons are created at different distances, without soliton fission, as each fundamental soliton moves outside the gain bandwidth through the Raman-induced spectral shifts. As a result, each input pulse creates multiple, temporally separated, ultrashort pulses of different wavelengths at the amplifier output. The number of pulses depends not only on the to…

Trapping of light in solitonic cavities and its role in the supercontinuum generation

We demonstrate that the fission of higher-order N-solitons with a subsequent ejection of fundamental quasi-solitons creates solitonic cavities, formed by a pair of solitons with dispersive light trapped between them. As a result of multiple reflections of the trapped light from the bounding solitons which act as mirrors, they bend their trajectories and collide. In the spectral-domain, the two solitons receive blue and red wavelength shifts, respectively. The spectrum of the bouncing trapped light alters as well. This phenomenon strongly affect spectral characteristics of the generated superco…

使用 Grid 平台中的遗传算法优化基于双孤子光源的超连续谱

Supercontinuum optimization for dual-soliton based light sources using genetic algorithms in a Grid platform

本文提出在 Grid 平台上利用遗传算法优化光纤双孤子光源的输入脉冲参数，以产生具有两个预设光谱峰的超连续谱，服务于第二近红外窗口的光学相干断层扫描应用。

利用量子灵敏度分析增强的色散傅里叶变换探测超快脉冲中的强度噪声

Probing intensity noise in ultrafast pulses using the dispersive Fourier transform augmented by quantum sensitivity analysis

本文结合 DFT 单发脉冲测量与 QSA 单步反向微分噪声分析，揭示孤子裂变和拉曼散射的功率相关平均场及量子噪声特性。

通过多次时间压缩（MTC）方法产生稳健的时间孤子序列

Generation of robust temporal soliton trains by the multiple-temporal-compression (MTC) method

本文通过系统数值分析证明多次时间压缩（MTC）方法比光子晶体光纤和熔融石英波导方法能更有效地控制孤子分裂，产生数量更多、功率更高且长距离稳定的基态孤子，并在多孤子碰撞和牛顿摆现象中展现出高效率。

多重时间压缩作为控制亮孤子与暗孤子产生的方法

Multiple Temporal Compression as a method to control the generation of bright and dark solitons

本文通过模拟广义非线性薛定谔方程，扩展多重时间压缩（MTC）方法以在正常色散波导中通过亮孤子相互作用产生暗孤子，并利用暗孤子精确控制亮孤子动力学，实现碰撞能量转移的缓解与切换，为光学器件设计提供潜力。

Broadband, stable and highly coherent supercontinuum generation at telecommunication wavelengths in an hydrogenated amorphous silicon waveguide

Hydrogenated amorphous silicon (a:Si-H) has recently been recognized as a highly nonlinear CMOS compatible photonic platform. We experimentally demonstrate the generation of a supercontinuum (SC) spanning over 500 nm in a-Si:H photonic wire waveguide at telecommunication wavelengths using femtosecond input pulse with energy lower than 5 pJ. Numerical modeling of pulse propagation in the waveguide, based on the experimentally characterized dispersion profile, shows that the supercontinuum is the result of soliton fission and dispersive wave generation. It is demonstrated that the SC is highly c…

On-chip two-octave supercontinuum generation by enhancing self-steepening of optical pulses

Dramatic advances in supercontinuum generation have been made recently using photonic crystal fibers, but it is quite challenging to obtain an octave-spanning supercontinuum on a chip, partially because of strong dispersion in high-index-contrast nonlinear integrated waveguides. We show by simulation that extremely flat and low dispersion can be achieved in silicon nitride slot waveguides over a wavelength band of 500 nm. Different from previously reported supercontinua that were generated either by higher-order soliton fission in anomalous dispersion regime or by self phase modulation in norm…

通过弯曲诱导色散修改实现多模光纤可调超连续谱

Tunable supercontinuum in multimode fiber via bending-induced dispersion modification

本文提出通过弯曲诱导局部色散修改高阶模以调控超连续谱，保持空间模不变，实现宽频带可调超连续光源，同时保持光束质量。