We analyze numerically optical waveguide structures in photorefractive media induced by one or two incoherent counter-propagating (CP) Airy beams. Under nonlinear focusing conditions, we show that for a single beam CP beams with various input positions, multiple waveguiding can be photo-induced the medium. Optical Gaussian therefore guided deflecting trajectory and/or even split into several output These results enable new configurations all-optical interconnections.

We report experimentally on extreme events in the pulsating dynamics of an optical time-delayed system, i.e., a diode laser subject to phase-conjugate feedback. study effect feedback strength events' properties. show transition non-Gaussian statistics pulse intensity and increased number as mirror reflectivity increases. The event is anticipated followed by smaller pulses with time-delay periodicity.

We demonstrate numerically that a semiconductor laser subjected to phase-conjugate feedback (PCF) can exhibit an enhancement in the complexity of chaos by comparison conventional optical feedback. Using quantifiers from spectral analysis and information theory, we under similar parametric conditions, PCF exhibits larger chaotic bandwidth higher flatness statistical complexity. These properties are utmost importance for applications secure communications random number generation.

Extreme intensity pulses sharing statistical properties similar to rogue waves have been recently observed in a laser diode with phase-conjugate feedback [A. Karsaklian Dal Bosco, D. Wolfersberger, and M. Sciamanna, Opt. Lett. 38, 703 (2013)], but remain unexplained. We demonstrate here that rate equation model of includes an instantaneous field reproduces qualitatively well the features these extreme events as identified experiment, i.e., deviation statistics Gaussian-shape time separating...

We experimentally and theoretically demonstrate the variety of nonlinear dynamics exhibited by a single frequency semiconductor laser subjected to optical injection from comb. The parameters (the detuning strength) comb properties (comb spacing amplitude injected lines) are varied unveil several such as locking, wave-mixing, chaotic dynamics, unlocked time-periodic corresponding new solutions. asymmetry is shown modify size locking region in parameter space, well common between solutions observed

Abstract The unique bending and shape-preserving properties of optical Airy beams offer a large range applications in for example beam routing, waveguiding, particle manipulation plasmonics. In these others, the may experience nonlinear light-matter interactions which turn modify propagation. A well-known is light self-focusing that leads to formation spatial soliton. Here, we unveil experimentally 1D-Airy photorefractive crystal under focusing conditions. transient evolution involves both...

We analyze the nonlinear dynamics of a semiconductor laser with optical injection from frequency comb. When varying both parameters (detuning and ratio) comb properties (number lines spacing), we identify select several dynamics, including (1) locking selective amplification line that shows smallest detuning injected laser, (2) unlocked time-periodic correspond to new broadened spectrum, thereby sharpening pulse generated at output, (3) chaotic dynamics.

Abstract We demonstrate the formation of a two dimensional Airy beam soliton in photorefractive crystal. By simply varying nonlinearity strength we identify several scenarios showing coexistence between an and emerging soliton. The output profile behaves according to theoretical existence curve can be tailored by even without modifying input shape. This last feature makes this distinct from Gaussian generated

A laser diode subject to a phase-conjugate optical feedback can exhibit rich nonlinear dynamics and chaos. We report here on two bifurcation mechanisms that appear when increasing the amount of light being fed back laser. First, we full suppression chaos from crisis induced by saddle-node self-pulsing, so-called external-cavity-mode solutions (ECMs). Second, feedback-dependent torus bifurcations ECMs may be responsible for large regions bistability between different high (beyond gigahertz)...

We analyse theoretically the spatiotemporal dynamics of two incoherent counterpropagating Airy beams interacting in a photorefractive crystal under focusing conditions. For large enough nonlinearity strength interaction between leads to light-induced waveguiding. The stability waveguide is determined by length, and beam's intensities improved when comparing situation using Gaussian beams. further identify threshold above which no longer static but evolves dynamically either time-periodically...

We analyze experimentally and theoretically the chaotic dynamics generated by a laser diode subjected to phase-conjugate feedback. Phase conjugation is obtained from four-wave mixing in BaTiO3 photorefractive crystal. demonstrate that chaos bandwidth first increases linearly with feedback ratio but then saturates relatively high values. With single optical feedback, up about 18 GHz achieved, which five times as large free-running relaxation oscillation frequency. Numerical simulations...

Abstract The diversity of observed nonlinear dynamics in laser diodes subjected to optical feedback shows promise as an excellent candidate for chaos-based commercial applications. Thus, works the last decade have primarily focused on system performances, geometric configurations, and balancing their trade-offs. We demonstrate operating phase-conjugate exhibiting state-of-the-art chaos bandwidth values reaching ≈ 30 GHz . report numerous high-frequency, spatiotemporally complex, chaotic...

In this Letter, we experimentally demonstrate a method to improve the bandwidth and flatness of chaos from laser diode using optical injection frequency comb. Our results show that an comb into extends area chaotic dynamics much broader parameters (injected power detuning frequency). The increased number injected lines spacing are used control significantly properties. We report signal with 32.8 GHz spectral 0.83.

Wideband chaos is of interest for applications such as random number generation or encrypted communications, which typically use optical feedback in a semiconductor laser. Here, we show that replacing conventional with phase-conjugate improves the bandwidth. In range achievable mirror reflectivities, bandwidth increase reaches 27% when compared from mirror. Experimental measurements time-resolved frequency dynamics on nanosecond time-scales enhancement related to onset self-pulsing solutions...

We perform an experimental parametric study of the chaos generated by a laser diode subjected to phase-conjugate feedback. In addition typical figure merit, i.e., bandwidth, corresponding spectral flatness and permutation entropy at delay is analyzed. Our observations reveal that can be with bandwidth $\ensuremath{\approx}29$ GHz, up 0.75, 0.99. These optimized performances are maintained over large range parameters have not been achieved in conventional optical feedback configuration....

Optical frequency comb technologies have received intense attention due to their numerous promising applications ranging from optical communications spectroscopy. In this study, we experimentally demonstrate a new approach of broadband generation based on the polarization mode competition in single-mode VCSELs. More specifically, analyze nonlinear dynamics and properties VCSELs when subject injection comb. When varying parameters (injection strength detuning frequency) (comb spacing), unveil...

We show that time-delayed feedback can induce an optimal regularity in the pulsating dynamics of a nonlinear system without need for additional noise source. This deterministic delay-induced coherence resonance is reported experimentally chaotic laser diode subject to phase-conjugate optical feedback, when varying amount light. Qualitatively similar found theoretically model class-A laser. The therefore not related interplay between and faster undamped relaxation oscillations thought be...

The rate equations for a laser diode subject to filtered phase-conjugate optical feedback are studied both analytically and numerically. We determine the Hopf bifurcation conditions, which we explore by using asymptotic methods. Numerical simulations of indicate that different pulsating intensity regimes observed wide filter progressively disappear as width increases. explain this phenomenon studying coalescence points Specifically, observe restabilization steady-state solution moderate...

An 852 nm semiconductor laser is experimentally subjected to phase-conjugate time-delayed feedback achieved through four-wave mixing in a photorefractive ($ {{\rm BaTiO}_{3}} $BaTiO3) crystal. Permutation entropy (PE) used uncover distinctive temporal signatures corresponding the sub-harmonics of round-trip time and relaxation oscillations. Complex spatiotemporal outputs with high PE mostly upwards $ \sim 0.85 $∼0.85 chaos bandwidth (BW) up 31\;{\rm GHz} $∼31GHz are observed over strengths...

Photorefractive beam self-trapping is investigated in InP:Fe and shown to occur within tens of microseconds after switch on. This fast response time predicted by an analytical theoretical interpretation based on a simple photorefraction model which suggests buildups range consistent with experiments.

We analyze the nonlinear propagation of a one-dimensional Airy beam. Under focusing conditions, beam splits into weak accelerating structure and that has been named an ``off-shooting soliton.'' Experimental measurements numerical results related to off-shooting are compared soliton theoretical profiles good agreement is found in terms transverse shape, width, amplitude. identify different parameters generate demonstrate its profile also preserved through over long distances.

We provide experimental evidence of super-harmonic self-pulsation in a laser diode with phase-conjugate optical feedback (PCF), i.e., time-periodic nearly sinusoidal oscillating output power at frequency being multiple the external-cavity that corresponds to long-standing predictions so-called “external-cavity mode” [G. P. Agrawal and J. T. Klaus, Opt. Lett. 16, 1325–1327 (1991)]. High-harmonic self-pulsations have been so far limited configurations long time-delay, hence relatively small...

We unveil theoretically the bifurcations to chaotic low-frequency fluctuations (LFF) in a laser diode with phase-conjugate feedback (PCF). LFF occur from itinerancy among destabilized limit-cycle attractors that correspond external-cavity modes (ECMs) of PCF system and directional motion toward self-pulsating dynamics increasing frequency larger output power. When strength, fast-pulsing changes about multiple frequency, which is unique feature PCF.