A novel method for controlling chaos in external cavity semiconductor laser

The nonlinear dynamics of two mutually injected semiconductor lasers subject to external optical feedback are studied numerically. Three types of dynamics are investigated, which are induced by external optical feedback, mutual coupling and a combination of both mechanisms, respectively. In an optical feedback system, a period-doubling route and a variety of nonlinear states are observed. In a mutually injected semiconductor laser system, both lasers show a period-doubling route to chaos; moreover, the frequency detuning plays an important role in determining the system behaviours, i.e. it can increase the system complexity or drive both lasers to exhibit periodic oscillations. When both effects are considered simultaneously, the system behaviours are determined by their relative strength. When one dominates in the competition, the hybrid system exhibits similar behaviours to those it introduced. It is also found that one of the two nonlinear mechanisms can be used to suppress the dynamics introduced by the other, or to produce a highly complex chaos. Finally, a high quality of synchronization between the two chaotic outputs is achieved, although the bias currents of the two lasers are different.

http://iopscience.iop.org/article/10.1088/0268-1242/21/1/005/pdf

Nonlinear dynamics of two mutually injected external-cavity semiconductor lasers

Nonlinear dynamics of a vertical-cavity surface-emitting laser (VCSEL) with external optical injection are studied numerically. We consider a master–slave configuration where the dynamic characteristics of the slave are affected by the optical injection from the master, and we also establish the corresponding Simulink model. The period-doubling route as well as the period-halving route is observed, where the regular, double-periodic, and chaotic pulsings are found. By adjusting the injection strength properly, the laser can be controlled to work at a given state. The effects of frequency detuning on the nonlinear behaviors are also investigated in terms of the bifurcation diagrams of photon density with the frequency detuning. For weak injection case, the nonlinear dynamics shown by the laser are quite different when the value of frequency detuning varies contrarily (positive and negative direction). If the optical injection is strong enough, the slave can be locked by the master even though the frequency detuning is relatively large.

/pdf/nonlinear-dynamic-behaviors-of-an-optically-injected-2aruwwtauw.pdf

Nonlinear dynamic behaviors of an optically injected vertical-cavity surface-emitting laser

Enhanced chaos synchronization communication between vertical-cavity surface-emitting lasers (VCSELs) is investigated numerically, by adopting a polarization communication protocol where one polarization mode is used as the chaotic carrier and the orthogonal polarization mode is used as the disturbed signal. The chaos synchronization quality for the receiver laser (RL) and attacker laser (AL) are analyzed in terms of the cross-correlation coefficient. There are two distinct regions of good synchronization quality in the injection parameters space. In the first region, good synchronization quality can be ensured for both the RL and AL. In the second region, only the RL can realize chaos synchronization. We further discuss the security enhancement by comparing the communication performance between RL and AL for injection parameters within the second region. The results show that successful and robust decoding is only achievable for the RL.

Using polarization properties to enhance performance of chaos synchronization communication between vertical-cavity surface-emitting lasers

Static and dynamic characteristics of birefringent vertical-cavity surface-emitting lasers (VCSELs) subject to both isotropic and polarisation-selective optical feedback are investigated theoretically. The model considers two orthogonally polarised transverse modes; moreover, the spatial dependences of photon density, carrier density and injection current are taken into account. For a short external cavity, the two-mode VCSELs can be forced to operate with one mode by introducing the polarisation-selective optical feedback. It is further shown that the phase of feedback light determined by the external cavity length affects the laser operation characteristics greatly, that is, when the external cavity length is chosen, the reflected light strengthens (weakens) the optical field in the laser cavity, the mode that has the same polarisation direction can be enhanced (suppressed), while the other mode is suppressed (enhanced) correspondingly. For a relatively long external cavity, the continuous wave operation of VCSELs is destabilised and rich non-linear dynamics are excited. By increasing the external cavity length, the VCSELs follow a period-halving route to chaos. It is also found that the evolution of dynamics shows periodic repetition with respect to the external cavity length, and the period is half of the lasing wavelength. Further investigation shows that, for isotropic feedback, both modes exhibit the same dynamics and similar mode intensity; for polarisation-selective feedback, though similar non-linear behaviours are observed, the modal strengths are quite different, that is, the feedback light enhances one mode while greatly suppressing the orthogonally polarised mode.

Static and dynamic characteristics of VCSELs with polarisation-selective optical feedback

A numerical study of using external optical injection to suppress the nonlinear dynamics introduced by external optical feedback in vertical-cavity surface-emitting lasers (VCSELs) has been undertaken. The model under consideration is a master–slave configuration where the master VCSEL provides the continuous wave to control the nonlinear behaviors arising in the slave VCSEL. Simulation results indicate that the feedback-induced nonlinear dynamics (e.g. chaotic, single-periodic, and multi-periodic oscillations), relative intensity noise (RIN) as well as the coherence collapse can be suppressed effectively as long as the injection is strong enough to overcome the nonlinear effects of the feedback.

Suppressing nonlinear dynamics induced by external optical feedback in vertical-cavity surface-emitting lasers

We present a new fitting method that can robustly and accurately fit the complex transmission curve of a superconducting resonator in the nonlinear regime. This method takes into account the varying internal current in the resonator at different frequencies and the nonlinear dependence of the inductance on the internal current L=L0(1+I2/I∗2) , where I∗ is a characteristic current. We demonstrate using this method to retrieve important resonator parameters, such as the quality factor and the resonance frequency, from resonators driven below, near, and above bifurcation. We further use this method to retrieve I∗ for lumped-element TiN resonators with various inductor designs. By fitting the resonance frequency shift at different readout powers of each resonator, we can determine the characteristic current I∗ , which is found to be linearly related to the cross-sectional area of the narrow inductor strip. Our method has wide applications in superconducting detector, superconducting qubit and parametric amplifier data analysis where the resonator is driven in the nonlinear regime.

New method for fitting complex resonance curve to study nonlinear superconducting resonators

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Y. Wang

Author Tools

Chat about Author

Papers

Suppressing nonlinear dynamics induced by external optical feedback in vertical-cavity surface-emitting lasers

New method for fitting complex resonance curve to study nonlinear superconducting resonators