طراحی و شبیه‌سازی مقایسه‌کننده تک‌بیتی تمام نوری فوق سریع با استفاده از تشدیدگرهای حلقوی بلور فوتونی

نوع مقاله : مقاله پژوهشی

نویسنده

استادیار، گروه مهندسی برق، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد شهرکرد،شهرکرد، ایران

چکیده

در این مقاله یک طرح جدید از یک مقایسه‌کننده تک‌بیتی تمام نوری فوق سریع ارائه می‌شود که بر اساس تشدیدگرهای حلقوی بلور فوتونی متشکل از شیشه‌های آلائیده با ضریب غیرخطی بالا ساخته می‌شود. ساختار کلی این مقایسه‌کننده شامل دو ورودی، چهار تشدیدگر حلقوی همراه با تعدادی موج‌بر برای مقایسه و سه خروجی برای ارائه نتیجه است که همه در بستر بلور فوتونی ایجاد شده‌اند. با استفاده از روش عددی بسط امواج تخت ساختار باندی آن محاسبه و نتایج حاصل شده نشان می‌دهند که بلور فوتونی پایه دارای شکاف باند فوتونی در مد پلاریزه TM در پنجره  طول‌موجی باند S، C و L است و برای کاربردهای مخابراتی ابزاری مناسب می‌باشد. برای حل معادلات ماکسول از روش تفاضلی محدود در حوزه زمان استفاده شده است که هدف از آن بررسی رفتار انتشاری نور درون ساختار نهایی است. نتایج مطالعات عددی نشان می‌دهند ساختار طراحی شده دارای پاسخ زمانی بسیار کوتاه 3 پیکوثانیه است که نسبت به تمامی مقایسه‌کننده­های طراحی‌شده تاکنون شامل مقایسه­کننده‌های الکترونیکی، و تمام نوری از سرعت بالاتری برخوردار است. همچنین مساحت نسبتاً کوچک آن‌که در حدود 826 میکرومتر مربع است، استفاده از آن در طراحی مدارهای فوتونیکی مجتمع را ممکن می‌سازد.

کلیدواژه‌ها


عنوان مقاله [English]

Design and Simulation of an Ultra-Fast All-Optical Single-Bit Comparator Based on Photonic Crystal Ring Resonators

نویسنده [English]

  • Hamed Saghaei
Assistant Professor, Department of Electrical Engineering, Faculty of Engineering, Islamic Azad University, Shahrekord Branch, Shahrekord, Iran
چکیده [English]

A digital comparator is a logic circuit used to compare two binary numbers. So far, various designs have been proposed using logic gates, which are mainly based on electrical signals and lack the desired high speed. This paper presents a new design of an ultra-fast all-optical single-bit comparator based on photonic crystal ring resonators consisting of highly nonlinear glass. The structure of this comparator consists of two inputs, four ring resonators with a number of waveguides for comparison and three outputs for displaying the result, all created in a photon crystal bed. Using the plane wave expansion method, its band structure is calculated and the results show that the fundamental photonic crystal has a photonic band gap in the polarized TM mode in S, C and L bands that is a suitable tool for telecommunication applications. To solve the Maxwell's equations, the        finite-difference time-domain method is used, which aims to investigate the light propagation inside the final structure. The results of numerical studies show that the designed structure has a very short response time of 3 ps, making it faster than all the comparators designed so far, including electronic, electro-optical and all-optical comparators. Also, its relatively small area of 826 μm2 makes it applicable in the design of photonic integrated circuits.

کلیدواژه‌ها [English]

  • All-Optical Comparator
  • Photonic Crystal
  • Nonlinear Ring Resonator
  • Optical Kerr Effect
  • Plane Wave Expansion Method
  • Finite-Difference Time-Domain Method
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