We experimentally demonstrate random bit generation using multi-bit samples of bandwidth-enhanced chaos in semiconductor lasers. Chaotic fluctuation laser output is generated a with optical feedback and the chaotic injected into second to obtain intensity signal bandwidth enhanced up 16 GHz. The converted an 8-bit digital by sampling oscilloscope at 12.5 Giga per (GS/s). Random bits are bitwise exclusive-OR operation on corresponding its time-delayed signal. Statistical tests verify...

We propose a secure key distribution scheme based on correlated physical randomness in remote optical scramblers driven by common random light. The security of the depends practical difficulty completely observing phenomena. describe particular realization using synchronization semiconductor lasers injected with light randomly varying phase. experimentally demonstrate feasibility over distance 120 km.

We study the effect of dynamical tunneling on emission from ray-chaotic microcavities by introducing a suitably designed deformed disk cavity. focus its high quality factor modes strongly localized along stable periodic ray orbit confined total internal reflection. It is shown that dominant originates to chaotic ones; latter eventually escape cavity refractively, resulting in directional unexpected geometry orbit, but fully explained unstable manifolds dynamics. Experimentally performing...

It is shown that broadband chaos suitable for fast nondeterministic random-bit generation in small devices can be achieved a semiconductor laser with short external cavity. The design of the device based on theoretical model by amplification microscopic noise. Moreover, it demonstrated bit sequences passing common tests statistical randomness at rates up to 2.08 Gbits/s generated using on-chip lasers monolithically integrated cavity, amplifiers, and photodetector.

Abstract Advances in processing technology, such as quantum‐well structures and dry‐etching techniques, have made it possible to create new types of two‐dimensional (2D) microcavity lasers which 2D emission patterns output laser light although conventional one‐dimensional (1D) edge‐emitting‐type 1D emission. Two‐dimensional given nice experimental stages for fundamental researches on wave chaos closely related quantum chaos. New also can offer the important lasing characteristics...

We propose a scheme for fast random number generation with bandwidth-enhanced chaotic semiconductor lasers. Chaotic laser intensity output and its time-delayed signal are sampled at 50 GigaSample per second converted into eight-bit values. The order of the samples is reversed, bitwise exclusive-or operation executed between bit-order-reversed original samples. With this method, it not necessary to eliminate any bits in obtain good-quality bit sequences. equivalent rate 8×50 Gb/s achieved an...

Random number generators are essential for applications in information security and numerical simulations. Most optical-chaos-based random produce bit sequences by offline post-processing with large optical components. We demonstrate a real-time hardware implementation of fast physical generator photonic integrated circuit field programmable gate array (FPGA) electronic board. generate 1-Tbit evaluate their statistical randomness using NIST Special Publication 800-22 TestU01. All the...

The limacon-shaped semiconductor microcavity is a ray-chaotic cavity sustaining low-loss modes with mostly unidirectional emission patterns. Investigating these systematically, we show that the correspond to ray description collectively, rather than individually. In addition, present experimental data on multimode lasing patterns high unidirectionality and closely agree description. origin of this agreement well explained by collective correspondence mechanism.

We report a novel chaos semiconductor laser chip in which distributed feedback (DFB) laser, two optical amplifiers (SOAs) and photodiode (PD) are monolithically integrated with passive ring waveguide. The ring-type structure the separate SOAs achieves stronger delayed compared to previous chips use linear waveguide facet-reflection. PD allows efficient detection of signal low loss. A rich variety dynamical behaviors signals can be selectively generated via injection currents SOAs. In...

We generate random bit sequences from chaotic temporal waveforms by using photonic integrated circuits (PICs) with different external cavity lengths. investigate the condition for generating bits at sampling rates of single-bit generation method PICs. succeed in certified PIC 3, 4, 5, or 10-mm-long cavity, whereas cannot pass all statistical tests randomness when 1 2 mm-long is used.

Laser action on a single spatially chaotic wave function is obtained as final stable state in nonlinear dynamical model of stadium shaped resonant cavity with an active medium. The single-mode lasing corresponds to particular metastable resonance the which wins competition among multiple modes positive net linear gain and has distinct threshold.

Scar wave functions in a fully chaotic cavity are obtained numerically by an extended Fox-Li method. Lasing on the scar modes observed semiconductor microcavity with selective excitation of different scars controlled corresponding shape electrodes for current injection.

We present theoretical and experimental studies on two-dimensional microcavity laser diodes with stadium quasi-stadium shapes. report a demonstration of lasing for the first time in fully chaotic microcavity-a stadium-shaped cavity which is rigorously known to be chaotic. also systematic three types resonator conditions: stable, marginally unstable. Morphological dependence characteristics elucidated. show examples application beam switching operation optical signal distribution by using...

Locking of two resonance modes different symmetry classes and frequencies in 2D resonant microcavity lasers is investigated by using a nonlinear dynamical model. The patterns stationary lasing states far fields are asymmetric spite the symmetric shape microcavity. corresponding phenomenon actually observed experiment semiconductor laser diode.

We analyze the time for growth of bit entropy when generating nondeterministic bits using a chaotic semiconductor laser model. The mechanism is modeled as 1-bit sampling intensity light output. Microscopic noise results in an ensemble trajectories whose increases with time. entropy, called memory time, depends on both strength and dynamics. It shown that average decreases logarithmically increase strength. argued ratio change logarithm can be used to estimate intrinsic dynamical rate this...

We theoretically show that completely stochastic fast physical random bit generation at a rate of more than one gigabit per second can be realized by using lasers with optical delayed feedback which creates high-dimensional chaos laser light outputs. The theory is based on the mixing property chaos, transduces microscopic quantum noise spontaneous emission in into transitions between discrete macroscopic states.

We present theoretical models of two-dimensional (2D) microcavity lasers. The relation between stationary lasing modes and resonances or metastable states is elucidated for arbitrary shapes 2D resonant microcavities.

Light emission from a dielectric cavity with stadium shape is studied in both ray and wave models. For passive mode low loss, remarkable correspondence found between the phase space representation of quasibound function its counterpart distribution model. This result provides additional more direct evidence for good ray-wave low-loss modes previously observed at level far-field pattern comparisons.

We experimentally show that a random optical pulse train can be generated by modulating bistable semiconductor ring laser. When the laser is switched from monostable to regime, it randomly selects one of two different stable unidirectional lasing modes, clockwise or counterclockwise modes. Non-deterministic sequences are driving switch parameter, injection current, with periodic signal. The origin nondeterministic randomness amplified spontaneous emission noise coupled counter-propagating...

Hamiltonian systems often reveal the chaotic phenomena with long time memory, and then average of a dynamical variable does not seem to converge toward certain constant monotonically. Even when looks like in limit under given initial condition, for many cases limiting value depends sensitively on data. Chaos system is usually discussed framework ergodic theory which guarantees weak law large number unique existence except measure zero set. However, hamiltonian chaos seems be difficult...

We study the far-field characteristics of oval-resonator laser diodes made an $\mathrm{GaAs}/{\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ quantum well. The resonator shapes are various oval geometries, thereby probing chaotic and mixed classical dynamics. pattern shows a pronounced fine structure that strongly depends on cavity shape. Comparing experimental data with ray-model simulations for Fresnel billiard yields convincing agreement all geometries reveals importance...

The Sagnac effect in two dimensional (2D) resonant microcavities is studied theoretically and numerically. frequency shift due to the occurs as a threshold phenomenon for angular velocity rotating microcavity. Above threshold, eigenfunctions of microcavity become waves while they are standing below threshold.

We study light emission patterns from stadium-shaped semiconductor (GaAs) microcavity lasers theoretically and experimentally. Performing systematic wave calculations for passive cavity modes, we demonstrate that the averaging by low-loss such as those realized in multimode lasing, generates an pattern good agreement with ray model's prediction. In addition, show dependence of experimental far-field on aspect ratio stadium is well reproduced model.

We present an experimental method for directly observing the amplification of microscopic intrinsic noise in a high-dimensional chaotic laser system, with delayed feedback. In experiment, system is repeatedly switched from stable lasing state to state, and time evolution ensemble states starting same initial measured. It experimentally demonstrated that noises amplified by dynamics are transformed into macroscopic fluctuating signals, probability density output light intensity actually...