مقاله پژوهشی: طراحی و شبیه‌سازی یک نیم‌جمع‌کنندۀ تمام‌نوری با استفاده از حلقه‌های تشدید غیرخطی مبتنی بر بلور فوتونی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه مهندسی برق، دانشگاه آزاد اسلامی واحد کازرون، کازرون، ایران

2 استادیار، گروه مهندسی برق، دانشگاه آزاد اسلامی واحد کازرون، کازرون، ایران

چکیده

جمع‌کننده‌های تمام‌نوری نقشی کلیدی در تحقق نسل جدید مدارهای دیجیتال تمام‌نوری ایفا می‌کنند. در این مقاله، با استفاده از حلقه‌های تشدید غیرخطی مبتنی بر بلورهای فوتونی دوبعدی ساختار جدیدی برای پیاده‌سازی نیم‌جمع‌کنندۀ تمام‌نوری طراحی و ارائه شده است. برای پیاده‌سازی حلقه‌های غیرخطی از یک لایه میله ناراستی از جنس شیشۀ آلاییده‌شده بین هسته و لایۀ بیرونی حلقۀ تشدید استفاده شده است. در موادی که ضریب کِر بزرگی دارند، ضریب‌شکست به‌شدت به تغییرات شدت نور وابسته است، لذا با ترکیب این مواد با تشدیدکننده‌های تمام‌نوری می‌توان سوئیچ نوری را پیاده‌سازی کرد. برای طراحی ساختار پیشنهادی، از دو حلقۀ تشدید غیرخطی استفاده شده است. هر دو حلقه چنان طراحی شده‌اند که پرتوهای نوری با شدت نور کمتر از آستانۀ سوئیچ‌زنی را بین دو موجبر منتقل می‌کنند. ولی اگر شدت نور بیشتر از حد آستانۀ سوئیچ‌زنی باشد، حلقه‌ها نمی‌توانند پرتوهای نوری را بین دو موجبر منتقل کنند. ساختار طراحی‌شده با استفاده از نرم‌افزار آرسافت شبیه‌سازی شده است. ساختار پیشنهادی دو پایۀ ورودی و دو پایۀ خروجی دارد. مطابق با نتایج شبیه‌سازی‌ها، در حالتی‌که هر دو پایۀ ورودی خاموش است، هر دو پایۀ خروجی نیز خاموش خواهد بود. درصورتی‌که فقط یکی از پایه‌های ورودی روشن باشد، پایۀ خروجی S روشن می‌شود و در صورتی‌که هر دو پایۀ ورودی روشن باشد، پایۀ خروجی C روشن می‌شود. این نتایج کاملاً با عملکرد یک نیم‌جمع‌کننده مطابقت دارند. بیشترین مقدار برای زمان صعود ساختار طراحی‌شده برابر ps 1٫5 است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Design and Simulation of an All-optical Half Adder Using Nonlinear Photonic Crystal Ring Resonators

نویسندگان [English]

  • Niloofar Khajeheian 1
  • Jasem Jamali 2
  • Mohammadhossein Fatehi-Dindarlou 2
  • Mehdi Taghizadeh 2
1 Ph. D. Student, Department of Electrical Engineering, Kazerun Branch, Islamic Azad University, Kazerun,
2 Assistant Professor, Department of Electrical Engineering, Kazerun Branch, Islamic Azad University, Kazerun, Iran
چکیده [English]

All-optical adders play a key role in the next generation of all-optical digital circuits. In this paper, using nonlinear resonance rings based on 2D photon crystals, a new structure has been designed to implement an all-optical half adder. To implement the required nonlinear ring resonators, some nonlinear defects made of doped glass were introduced between the core and outer layer of the resonant rings. The refractive index of nonlinear materials with high Kerr coefficients is very sensitive to the variation of optical intensity, so one can design optical switches by combining these materials with resonant rings. Two nonlinear resonant rings are used for designing the proposed all-optical half adder. Both rings are designed such that they can drop optical waves when the optical intensity is less than the switching threshold, but when the optical intensity is more than the switching threshold, they cannot drop the optical waves. The final structure has two input and two output ports. The proposed structure was simulated using Rsoft photonics CAD. According to the simulation results when both inputs ports are OFF, both output ports will remain OFF. If only one of the input ports is ON, the S port will be ON, and C will be OFF. Finally, when both input ports are ON, the C port will be ON, and S will be OFF. Therefore, these results prove that the proposed structure can work as an all-optical half adder. The maximum rise time for the proposed structure is about 1.5 ps.

کلیدواژه‌ها [English]

  • Photonic Crystal
  • Optical half adder
  • Nonlinear Ring Resonator
  • Kerr Effect
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