Abstract
It has been shown analytically that Peregrine solitons emerge locally from a universal mechanism in the so-called semiclassical limit of the one-dimensional focusing nonlinear Schrödinger equation. Experimentally, this limit corresponds to the strongly nonlinear regime where the dispersion is much weaker than nonlinearity at initial time. We review here evidences of this phenomenon obtained on different experimental platforms. In particular, the spontaneous emergence of coherent structures exhibiting locally the Peregrine soliton behavior has been demonstrated in optical fiber experiments involving either single pulse or partially coherent waves. We also review theoretical and numerical results showing the link between this phenomenon and the emergence of heavy-tailed statistics (rogue waves).
1 Introduction
Recent mathematical works have recently triggered new research by unifying two old concepts, namely, the Peregrine soliton (PS) and the pulse compression in focusing nonlinear media [1]. The latter has been in particular widely investigated in optical fiber experiments for obvious application purposes [2], while the former has been extensively studied as a remarkable localized solution of the one-dimensional focusing nonlinear Schrödinger equation (1-D NLSE) [3]for a complex wave field .
The universal NLSE (1) describes at leading order nonlinear waves in various physical systems and is integrable [4]. Its exact solutions called solitons on finite background (SFBs) such as Akhmediev breathers, Kuznetsov–Ma, and Peregrine solitons have been derived several decades ago [3, 5–8]. First studied in the context of modulation instability, SFBs have been the subject of a renewed interest in the 2000s because these localized solutions are considered as possible prototypes of rogue waves [9–12]. The PS solution is given byand it exhibits the remarkable property to be localized both in space and in time [3]. It has been experimentally generated by using specifically designed initial conditions in optical fibers [13], plasmas [14], and water tank [15].
In a completely different context, pulse compression has been widely studied in the last 4 decades both experimentaly in optical fiber experiments and theoretically by using numerical simulations of the NLSE [2, 16–19]. The goal of these studies was to provide the shortest possible pulse with the highest peak power at the output of the fiber. It is very important to note that these studies have been focused on the so-called higher-order solitons, also named “N-solitons” which means that the initial pulse is “made” of several solitons in the framework of the inverse scattering transform (IST) [20]. As a consequence, it is often considered that the pulse compression arises from the propagation of bound-state multi-soliton solutions [17].
Mathematics has provided in the 2010s a different perspective on pulse compression in focusing regime of the NLSE [1]. It has been rigorously demonstrated that in the semiclassical (zero dispersion) limit of the NLSE, a sufficiently smooth pulse undergoes a gradient catastrophe, that is, the divergence of the derivatives of the field that is regularized by the generation of a coherent structure locally (asymptotically) described by the PS solution.
Very importantly, this theorem provides a local interpretation of the mechanism underlying the pulse compression and links this phenomenon with the famous PS. Note that the result is somehow surprising because the pulse compression is obviously achieved with zero boundary conditions, while the PS is a solution of the NLSE with nonzero boundary conditions. Moreover, this mechanism is universal because it is independent of the soliton content and of the exact shape of the initial pulse. As a consequence, while the exact PS is often seen as the interaction between a plane wave and a soliton [21], the local emergence of the PS arising in the pulse compression does not require the existence of the soliton.
This short review aims at presenting the main mathematical and experimental results related to the local emergence of the PS in the process of pulse compression. We also show the important consequences of this phenomenon on the statistical properties of nonlinear random waves in focusing NLSE systems [22–24].
2 Mathematical Results: Regularization of the Gradient Catastrophe in the Semiclassical Focusing NLSE
Semiclassical limit is a powerful tool to study large space–time, , behavior of the NLSE (1). It is achieved by introducing a small parameter and rescaling , , so that focusing NLSE (1) assumes the form
In the following, we assume that the amplitude of ψ at is .
Physically, the nondimensional dispersion parameter ε is determined by the ratio of the nonlinear medium’s internal coherence length (the soliton width/duration) and the typical scale of initial data. Therefore, the study of small-dispersion dynamics in (3) is equivalent to the study of the evolution of large-scale data in the original NLSE (1). Importantly, the limit as in Eq. 3 enables analysis of solutions to (1) for both large and -scales using the same equation.
It is convenient to introduce a Wentzel–Kramers–Brillouin (WKB)-type representation for (the Madelung transform):to convert the semiclassical NLSE (3) into a system:for the wave field intensity (power) and the “chirp” . Note that the system (5) is strictly equivalent to the NLSE.
The dispersionless limit is obtained from (5) by setting . In this limit, the system (5) is of elliptic type so that its solutions, when exist, have finite life span due to the development of infinite τ- and ξ-derivatives of ρ and u at some critical point , which is often referred to as a point of gradient catastrophe [25]. In the vicinity of the gradient catastrophe point, the contribution of the dispersive term in (5) becomes significant so that at , the emerging regularized dynamics exhibit large-amplitude, ε-scaled oscillations of the intensity signifying the singular nature of the semiclassical limit. The results reported in this review have been obtained mathematically and realized experimentally for small but nonzero values of ε [1]. Below, we summarize the history of the mathematical ideas underlying these results.
The semiclassical limit of the NLSE is most efficiently studied in the framework of the IST method [20]. At the heart of this theory is a linear differential [Zakharov–Shabat (ZS)] operator whose spectrum is determined by the NLSE wave field playing the role of the scattering potential. Generally, the IST spectrum has two components: discrete and continuous. The discrete component is related to a soliton “content” of , while the continuous component corresponds to dispersive wave radiation as . The potentials having pure continuous spectrum are called solitonless. The IST spectrum is invariant with respect to the NLSE evolution and so can be evaluated at .
The study of the semiclassical limit of integrable equations was initiated by Lax and Levermore [26] in the framework of the Korteweg–de Vries (KdV) equation for which the associated scattering operator is self-adjoint. The attempts to extend the Lax–Levermore theory to the focusing NLSE ran into complications due to non–self-adjoint nature of the ZS operator for (3). The first numerical studies [27–29] revealed an -region of the initial evolution of smooth modulated plane wave followed by the emergence of a region filled with rapid nonlinear oscillations exhibiting complex spatiotemporal behavior (see Figure 1A). The development of the steepest descent method of Deift–Zhou for matrix Riemann–Hilbert problems (RHPs) (see, e.g., [30]) in 1990s led to rigorous mathematical studies of the semiclassical NLSE limit in Ref. 31 (pure discrete spectrum, i.e., solitons only) and in Ref. 32 (both purely radiative (solitonless) cases and radiation with solitons) revealed the detailed micro- and macroscopic structures of the emerging oscillations. In particular, in Ref. 32, the NLSE (Eq. 3) evolution of a one-parameter family of modulated plane wave potentialswhere is the chirp parameter controlling the phase, was studied. The advantage of this family of potentials is that the corresponding scattering data (the IST spectrum) can been calculated explicitly [33]; moreover, its soliton “content” is controlled by the chirp parameter μ; the discrete spectrum component (solitons) is only present when ; otherwise, the spectrum is purely continuous (radiation). The spectrum is purely discrete if and only if and , where . In this case, the potential (6) represents an exact N-soliton solution of the NLSE (3).
FIGURE 1
The RHP approach allowed establishing rigorous semiclassical asymptotics describing the complex nonlinear dynamics of the NLSE (3) with analytic initial data decaying as . In particular, it was shown in Ref. 32 that for the potential (Eq. 6), the initial evolution is approximated at leading order in ε by the solution of the dispersionless NLSE ( in (Eq. 5)) that undergoes gradient catastrophe at the point (see Ref. 34 for broader class of initial data ).
It was shown in Ref. 1 that if the gradient catastrophe occurs (for ), it exhibits a regularization mechanism (for ) via the emergence of a localized coherent structure, which is asymptotically close to PS (2). The mechanism is universal because it does not depend on the particular form of initial data . Specifically, it was shown that the solution at the point of maximum localization assumes the form , where is the background amplitude, that is, it is determined at the leading order by the value of instantaneous power at the gradient catastrophe point. In the case of potential (6), it was found that . The maximum value of in the local PS is then and is determined up to . We stress that the above approximate PS solution is valid locally, in the ε-vicinity of the point .
Importantly, the effect of the local emergence of the PS right beyond the gradient catastrophe point is universal and does not depend on the composition of the (global) IST spectrum of the initial data. In other words, the initial condition for (5) can have high soliton content or be completely solitonless—in all cases, the PS appears as a nonlinear coherent structure locally regularizing the gradient catastrophe. The specific form of the initial condition affects only the time of the PS development.
3 Local Emergence of the Peregrine Soliton in Experiments With Single Pulse
The self-compression of pulses has been a very widely investigated topic experimentally, especially since the first observation of solitonic behavior in optical fibers in 1980 [35]. Indeed, it has been observed that the propagation of solitonic pulses with sufficiently high initial peak power is always accompanied, at first, by a narrowing of the pulses and an increase in their peak power before eventually undergoing successive splittings. These observations have been successfully compared to the well-known dynamics of higher-order solitons or “N-solitons” such that the phenomenon of pulse self-compression was referred to as the “Soliton effect” [2, 36, 37]. This effect has been widely studied [16, 38], including the two-stage compression technique [39] and higher-order effects [40, 41].
In the context of 1-D hydrodynamics experiments, similar dynamics have been observed in the compression of the envelope of and solitons, which suggests that the underlying mechanism may be of the same origin [42].
The recent mathematical results described above provide a new interpretation of the mechanism underlying most of the past experiments on what was called “soliton self-compression.” Two main ideas are important: (i) the mechanism actually does not depend on the soliton content of the pulse and (ii) the Peregrine soliton emerges locally as the regularization of gradient catrastrophe.
Point (ii) has been recently demonstrated in optical fiber experiments [43] using two different setups. In particular, picosecond pulses with a peak power W have been injected into a Ge-doped highly nonlinear optical fiber. The input pulses were well fitted by a sech profile corresponding to a soliton of an order , that is, . These experiments were performed for different fiber lengths, and a complete characterization of the compressed pulse in both amplitude and phase was achieved using the FROG technique [44]. The retrieved intensity (bottom) and phase (top) at the fiber lengths indicated, comparing experiment (black line) with simulations (red line), are plotted in Figures 1B,C. In all cases, there is an excellent agreement between experiment and simulation. Importantly, the intensity and phase profiles of an ideal PS solution match very well the experiment and simulation across the pulse center while approaching the maximum compression point (for the lengths of the fiber around 10 m). The main difference is that the PS solution is characterized by the background that extends to , whereas the pedestal observed in experiments is limited by the temporal width of the input pulse. As explained above, the emergence of the PS here is a local dynamical mechanism. As observed in Figure 1B, the π phase jump occurring at zero intensity between the central lobe and the background pedestal is a remarkable signature of the PS. Moreover, the change of the sign of the phase derivative across the maximum compression point, another characteristic of the exact PS solution, is also observed in the experiments between 10 and 10.6 m.
It is important to note that the experimental results of [43] show that the mechanism demonstrated in the semiclassical limit of NLSE [1] is very robust and can be observed over a very broad range of ε. The PS is observed at the maximum compression point of the pulse as long as .
4 Statistical Signatures in Nonlinear Random Wave Evolution
Recent studies have shown that the dynamical mechanism leading to the local emergence of the PS (see Sections 3 and 4) plays a crucial role in the emergence of rogue waves (RWs) and in the statistics of integrable turbulence [22–24]. Integrable turbulence corresponds to complex dynamical phenomena arising along the nonlinear propagation of random waves in a system governed by an integrable equation such as the NLSE [22, 43, 45–49].
An important example of integrable turbulence in NLSE systems arises when the initial field corresponds to the linear superposition of numerous independent Fourier components:Here, periodic boundary conditions with a period T are used, and is a kth Fourier component with a uniformly distributed random phase . This kind of partially coherent waves is fundamental because of the omnipresence, in natural environments, of stochastic waves with a finite Fourier spectrum having delta-correlated frequency components. The central limit theorem shows that the statistics of ψ given by Eq. 7 is Gaussian and the statistics of is exponential [46].
First observed in the open sea, RWs have been studied in a large variety of nonlinear media and can be defined as extreme (high-amplitude) events that appear more frequently than predicted by the linear theory [11]. Experimental investigations of the evolution of the partially coherent wave first in a water tank [50] and later in controlled optical fiber experiments well described by the NLSE [46] demonstrated the emergence of non-Gaussian statistics. An example of corresponding numerical simulation is shown in Figure 2, where the nonlinear propagation of partially coherent initial condition characterized by the exponential distribution for (depicted by green in plots in Figures 2A,D) leads to the heavy-tailed probability density function (Figure 2A orange and red lines)—the main evidence of the rogue wave emergence.
FIGURE 2
It is important to note that at present, there is no theory describing these statistical properties in the focusing 1-D NLSE system [22, 23, 46, 49]. However, remarkably, the local PSs (see, e.g., inset in Figure 2D), previously considered as a prototype of RWs, were identified in numerical simulations of the NLSE, reported along with the pioneering experimental observations. By using temporal imaging techniques, it has been proved that the temporal intensity profile of some extreme events emerging during the evolution of partially coherent light in optical fibers resembles the localized PS [22]. Recent advances of heterodyne time microscopy have enabled the ultrafast single-shot measurement of both phase and amplitude of random waves [23]. By using this technique, the local emergence of the PS embedded in partially coherent waves propagating in optical fibers has been fully demonstrated [23]. Having access to the phase and intensity profiles, it becomes possible to reconstruct the complex amplitude and, therefore, numerically find the initial structure resulting in the RW simply by simulating the reversed NLSE. Such nonlinear temporal holography revealed that the typical structure that leads to the RW emergence is a large initial hump. This observation constitutes the first solid evidence of the gradient catastrophe regularization playing a role in the nonlinear dynamics of partially coherent waves. Note that similar observations have been made in deep water wave experiments [51, 52].
A systematic study of the local PS emergence in integrable turbulence behind the 1-D NLSE has been provided first numerically [24] and later verified experimentally in a 1-D water tank [52]. Employing the robust theoretical results described in Section 2, a strong correlation between the distribution of lengths of local PS maximum compression and the most probable distances of the RW emergence has been found. Assuming that local humps present in the initial conditions evolve independently at least before the gradient catastrophe point, maximum compression points were estimated for each of them locally by renormalizing the NLSE according to the hump’s amplitude and duration. The computed probability density of the local PS emergence position took a shape of an asymmetric overshoot having a distinct maximum. As a measure of deviation from the Gaussian distribution, and therefore, the increased probability of RW observation, a fourth moment of the distribution (kurtosis) was employed. The presence of the overshoot in the kurtosis evolution for partially coherent initial conditions (see Figure 2C) has been shown in Ref. 53. Numerical simulations reported in Ref. 24 demonstrate a remarkable correlation between these two overshoots, implying that the area of the highest probability of observation of the extreme events in the evolution of partially coherent waves in the focusing 1-D NLS model is directly related to the local emergence of PSs as a regularization of the gradient catastrophe. As well as for the deterministic initial conditions described in Section 3, this effect remains valid beyond the formal applicability of the results reported in Ref. 1.
5 Discussion
The PS has been originally discovered as a breather solution of the focusing NLSE (with nonzero boundary conditions) that exhibits the remarkable property to be localized both in space and time [3]. It has been observed in experiments made in the 2000s with plasma waves [14], water waves [15], and optical waves [13]. In the 2010s, it has been shown mathematically that the PS also emerges locally as a universal mechanism of dispersive regularization of a gradient catastrophe arising in the self-focusing evolution of an initially broad pulse [1]. This mechanism of local emergence of the PS is universal in the sense that it depends neither on the exact shape of the initial pulse nor on its soliton content. The understanding that the PS emerges locally in the process of self-focusing of a broad wave packet [43] has shed new light on the self-compression of light pulses, which has been extensively studied in the fiber optics community in the 1980s.
The dynamical process of the emergence of the PS in the evolution of broad and smooth wave packets is highly relevant in the context of integrable turbulence where the nonlinear evolution of partially coherent waves is investigated at the statistical level. Partially coherent waves with an initial Gaussian statistics are indeed composed of a random collection of large humps (see Figure 2) which individually experience the self-focusing process leading to the gradient catastrophe regularized by the emergence of the PS [24]. As shown in Ref. [24], this feature explains well the behavior followed by statistical moments of the wave field such as the kurtosis. Remarkably, a similar conclusion draws from the large deviation theory with applications to the stochastic water wave dynamics [54].
The scenario of the local emergence of the PS in the regularization of a gradient catastrophe is expected to be robust against some perturbations such as dissipation and forcing [55, 56], and higher-order nonlinear effects [57]. However, the investigation of the role of higher-order effects now represents essentially an open question.
Funding
The work of ATo supported in part by the NSF grant DMS-2009647. The work of PS, ATi, FC, and SR has been partially supported by the Agence Nationale de la Recherche through the LABEX CEMPI project (ANR- 11-LABX-0007) and by the Ministry of Higher Education and Research, Hauts-De-France Regional Council and European Regional Development Fund (ERDF) through the Contrat de Projets Etat-Region (CPER Photonics for Society P4S) and by ISITE-ULNE through the DYDICO project. The work of GE was partially supported by the Engineering and Physical Science Research Council (EPSRC), United Kingdom, grant no. EP/R00515X/2.
Statements
Author contributions
All the authors wrote this mini review. ATo is the author of the key mathematical results reported in Section 2. PS, GE, SR, and ATi are authors of experimental and numerical results reported in Sections 3 and 4.
Acknowledgments
ATo acknowledges the laboratory PhLAM and the University of Lille for the 2020 invitation.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Summary
Keywords
Peregrine soliton, optical fibers, semiclassical limit, one-dimensional nonlinear Schrödinger equation, self-compression of optical solitons
Citation
Tikan A, Randoux S, El G, Tovbis A, Copie F and Suret P (2021) Local Emergence of Peregrine Solitons: Experiments and Theory. Front. Phys. 8:599435. doi: 10.3389/fphy.2020.599435
Received
27 August 2020
Accepted
04 November 2020
Published
05 February 2021
Volume
8 - 2020
Edited by
Bertrand Kibler, UMR6303 Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), France
Reviewed by
Fabio Baronio, University of Brescia, Italy
Stefan Wabnitz, Sapienza University of Rome, Italy
Updates
Copyright
© 2021 Tikan, Randoux, El, Tovbis, Copie and Suret.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Pierre Suret, Pierre.Suret@univ-lille.fr
This article was submitted to Mathematical and Statistical Physics, a section of the journal Frontiers in Physics
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