Nonlinear dynamics of a laser diode subjected to both optical and electronic feedback (original) (raw)
Related papers
Suppression of Chaotic Generation Caused by the External Optical Feedback in a Laser Diode
Journal of Russian Laser Research - J RUSS LASER RES, 2003
It is shown by computer simulation and in experiments that chaotic generation caused by the external optical feedback in a laser diode can be suppressed by means of a delayed optoelectronic feedback controlled by the injection current. The suppression of chaotic generation is realized for an AlGaAs/GaAs laser of the quantum wall structure. In the presence of the external optical feedback provided by the mirror placed at a distance of 1~mm the noise of optical intensity is of the oder of 10 µW, the single mode dominates in the spectrum, and its spectral width exceeds 600 MHz. The optoelectronic feedback controlled by the injection current reduces the noise by several times and narrows the generation line width down to 80 MHz.
Influence of optical feedback strength and semiconductor laser coherence on chaos communications
Journal of the Optical Society of America B, 2018
The existence of high chaotic spiking in the dynamics of semiconductor lasers with an AC-coupled optical feedback is investigated experimentally. After chaos signal generation, the effect of attenuation feedback strength as a control parameter is studied, and the time evolution of photon density is analyzed. The chaotic instability is tested; our results exhibit monostability in dynamics. By applying different frequencies to observe the hidden regions, the chaotic dynamic results are indicated as a good candidate to hide information for satisfying the resonance phenomenon, to evaluate secure optical communication.
Chaos Control by Directly Modulated Opto Electronic Feedback in Semiconductor Laser
2016
Nonlinear dynamic behavior of a directly modulated delayed optoelectronic feedback semiconductor laser has been studied numerically. The variation of small window of modulation current with the delayed optoelectronic feedback produces chaotic behavior of the laser output. The dynamics is completely determined by the variation of the injecting modulated amplitude (A). The chaotic spiking was observed at (A = 0.060). Excitability of the laser diode under directly modulation current with GHz was demonstrated by bifurcation diagram so the modulation amplitude is sensitive in output dynamic of the laser diode.
Chaos modulation in semiconductor laser with optoelectronic feedback
IOP Conference Series: Materials Science and Engineering
The experimental and numerical study of chaos modulation will be presented in two stats, first, when the frequency of the external perturbation is varied, secondly, when the amplitude of this perturbation is changed. The dynamics of the laser output are analyzed by Fast Fourier Transformation, attractors and bifurcation Diagram. Some frequencies could be hidden other appeared, when the frequencies are hidden, the communication link considered as secure.
Communication using Synchronization of Chaos in Semiconductor Lasers with optoelectronic feedback
2002
A communication scheme based on the synchronization of two chaotic semiconductor lasers is experimentally tested. The Chaos in the single-mode semiconductor lasers is generated by means of an optoelectronic feedback. Synchronization of the chaos is achieved by coupling a fraction of the transmitter's output power into the driving current of the receiver. We present experimental results on the route to
Experimental evidence of Phase Control method in chaotic Semiconductor Laser
Iraqi Journal of Science, 2019
we study how to control the dynamics of excitable systems by using the phase control technique.We study how to control nonlinear semiconductor laser dynamics with optoelectronic feedback using the phase control method. The phase control method uses the phase difference between a small.added frequenc y and the main driving frequency to suppress chaos, which leads to various periodic orbits. The experimental studying for the evaluation of chaos modulation behavior are considered in two conditions, the first condition, when one frequency of the external perturbation is varied, secondly, when two of these perturbations are changed. The chaotic system becomes regular under one frequency or two frequencies, But in two frequencies ,phase control showed an excellent ability to maintain regular behavior in chaotic window and reexcite chaotic behavior when destroyed. This dynamics of the laser output are analyzed by time series and bifurcation diagram.
Chaos, 2018
We observe experimentally two regimes of intermittency on the route to chaos of a semiconductor laser subjected to optical feedback from a long external cavity as the feedback level is increased. The first regime encountered corresponds to multistate intermittency involving two or three states composed of several combinations of periodic, quasiperiodic, and subharmonic dynamics. The second regime is observed for larger feedback levels and involves intermittency between perioddoubled and chaotic regimes. This latter type of intermittency displays statistical properties similar to those of on-off intermittency.
Coherence Resonance in Optical Feedback Chaos: Hiding Frequency in Chaos Communication
Chaos Theory
In this chapter, an experimentally and numerically conducted investigation of the existence of high chaotic spiking in the dynamics of semiconductor lasers with AC-coupled optical feedback, the bifurcation diagram by feedback strength attenuation and the bias current as a control parameter was done. A semiconductor laser subjected to an external optical feedback can present a big change of dynamic behaviors, such as periodic and quasiperiodic oscillations, chaos, coherence collapse, and low-frequency fluctuations (LFF's) that degrade the laser characteristics. The chaotic instability is experimentally investigated on feedback strength as a control parameter, and the resulted dynamic is monostability. Finally, we indicated that the observed chaotic dynamic is a good candidate to hide information in order to investigate the resonance phenomena, which is important for chaos to encrypt data in optical communication, where data disappear when modulated in a chaos carrier. The aim of this chapter is to investigate the encryption area in the chaotic system when the applied frequency is 1-500 MHz, for satisfying the secure communication.
We report on experimental results for the dynamical regime of a diode laser with delayed frequency selective optical feedback from a Fabry-Pérot interferometer type of filter located in the external feedback cavity of a diode laser. Three effects of the filter on the dynamical behavior of the diode laser are observed. First of all we report an Optical impedance effect resulting from the detuning between the filter center frequency and the closest external cavity mode. Second of all there is a filtering effect and it is shown how with an appropriate filter width it is possible to suppress and control some of the different dynamics usually present in conventional optical feedback. A reduction of the RO oscillations is reported for narrow bandwidth filters. Third of all, we report a non-linear shaping effect arising from the non-linear response in frequency of the filter profile which produces a new dynamics in frequency. To our best knowledge it is the first time that a frequency dyna...
Experimental route to chaos of an external-cavity semiconductor laser
Physical Review A, 2015
We report experimental bifurcation diagrams of a semiconductor laser, biased well above threshold, subjected to external optical feedback. As feedback is increased, we see a quasiperiodic route to chaos interrupted by several windows of periodicity corresponding to limit cycles, differing in frequency by multiples of the external-cavity free-spectral range that have developed around external-cavity modes (ECMs) whose frequency is slightly larger than that of the solitary laser. Successive windows correspond to the transition between two limit cycles either on the same or neighboring ECMs. For larger feedback, the laser operates in a chaotic regime around numerous negatively shifted external-cavity modes. These experimental observations detail the bifurcations leading to fully developed chaos in this system, and further provide detailed insight on the standard theoretical framework applied to these lasers.