المستودع الرقمي العراقي
Iraqi Digital Repository
استجابة التضمين والضوضاء في قفل الحقن لليزرات التعاقب الكمي == INTENSITY MODULATION RESPONSE AND NOISE IN INJECTION - LOCKING QUANTUM CASCADE LASERS
اسم المؤلف:
اخلاص عبد العالي حسين
اسم المشرف:
حسين هادي وارد
الموضوع العام:
علوم الفيزياء
السنة:
2017
الموضوع الدقيق:
الفيزياء
الدرجة:
ماجستير
الجامعة:
جامعة ذي قار - كلية العلوم - قسم الفيزياء
اللغة:
الانكليزية
مكان الجامعة:
ذي قار
الصفحات الاولى:
📎 26T1609 - p.pdf
المستخلص:
In communication field, there are many advantages for using terahertz carriers in optical data transmission along both analog and digital links such as small antenna sizes and large information bandwidth. The optical injection locking is an alternative technique to improve the dynamic properties of QCL light sources. In this technique the frequency and phase of one laser oscillator, known as the slave laser, are locked through the direct coupling to the light injection from another laser oscillator, known as the master laser. In this work, the optical injection locking induced laser dynamics in a QCL is investigated theoretically. The present theoretical analyses are based on the rate equations model that takes into account all carrier relaxation processes as well as the effect of the optical injection locking. The small signal analysis is used to calculate the intensity modulation response and intensity noise in QCL. The present analysis focuses on the effect of carrier relaxation time and the optical injection locking on the dynamic properties in these devices. The results show that the optical injection locking and fast carrier relaxation time can enhance the dynamic properties and decreases noise value and increases the modulation bandwidth in these advanced lasers. The optical injection locking increases the carrier density in active region to suppress the effect of fast carrier scattering to lower state and enhances the stimulated emission. The fast carrier relaxation times decreases the threshold injection current. Also, in optical injection operation, the active region length and linewidth enhancement factor has strong effect on the intensity modulation response and intensity noise.
مشاركة البيانات
Share Data