Homoclinic chaos by optoelectronic feedback in semiconductor devices : a modeling approach

العناوين الأخرى

نموذج تقريبي لتوليد الشواش المتناظر بواسطة إعادة التيار الكهروضوئي في شبه الموصل

مقدم أطروحة جامعية

Nasir, Haydar Ayid

مشرف أطروحة جامعية

Bassam, Sudud Salman Ahmad
al-Nuaymi, Qays Abd al-Sattar Muhammad Amin

الجامعة

جامعة بغداد

الكلية

كلية العلوم

القسم الأكاديمي

قسم الفيزياء

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2013

الملخص الإنجليزي

In the present work, we study the existence of slow chaotic spiking sequences in the dynamics of semiconductor laser with ac-coupled optoelectronic feedback (photocurrent injected to the semiconductor laser) and the corresponding Fast Fourier Transformation (FFT), and attractor.

The introduction of an ac-feedback optoelectronic loop adds both a third degree of freedom and a much slower time-scale.

The dimensionless differential equations which describe this model is achieved where the solitary laser dynamics is ruled by two coupled variables (intensity and population inversion) evolving with two very different characteristic time-scales.

The transitions from steady state to periodic, period doubling, chaotic, and Mixed Mode Oscillations (MMOs) states are observed by varying dc-bias current and feedback strength, which could be produced by a map.

The bifurcation and bistability, observed by modulation of this transitions, have been showed by our model.

MMOs can be ordered in periodic-chaotic sequences, in which intervals of periodic states are separated by chaotic states which can be plotted of a suitably defined winding number (R).

The chaotic spiking regime can be understood in terms of excitability of chaotic attractor.

The excitable behavior is observed also on each of the periodic attractors within the period-doubling cascade leading to chaos.

التخصصات الرئيسية

الرياضيات
الفيزياء

الموضوعات

• النماذج الرياضية
• نظرية التحكم
• أشباه الموصلات

عدد الصفحات

106

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-607060