مقاله پژوهشی: طرّاحی و شبیه سازی یک دی‌مدولاتورِ کلیدزنی انتقالِ تمام‌نوری فرکانس با استفاده از کاواک‌های تشدید مبتنی بر بلور فوتونی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی برق، دانشگاه آزاد اسلامی واحد اهر، اهر، آذربایجان شرقی، ایران

2 دانشیار، گروه مهندسی برق، دانشگاه آزاد اسلامی واحد تبریز، تبریز، آذربایجان شرقی، ایران

چکیده

 استفاده از  افزاره (ابزار) های تمام‌نوری برای پیاده­سازی شبکه­های مخابرات تمام‌نوری بسیار مهم است. با استفاده از دی­مدولاتورِ (تفکیک کنندۀ) کلیدزنی انتقال تمام‌نوری فرکانس می‌توان کدهای دوتایی دیجیتال را با کمک فرکانسِ نورِ ورودی تولید کرد. در این مقاله ساختار جدیدی برای طرّاحی دی­مدولاتور کلیدزنی انتقالِ تمام‌نوری فرکانس با استفاده از بلورهای فوتونی معرّفی شده است. از سه کاواکِ تشدید با مدهای تشدیدِ (بازآوایی) مختلف برای فرایند گزینش فرکانس‌ها استفاده شده است. برای این‌که مدهای تشدید کاواک­ها با یکدیگر متفاوت باشد، شعاع میله‌های ناراستی  به کار رفته درون کاواک­های سه­گانه، متفاوت از هم انتخاب شده است. نتایج شبیه‌سازی نشان می‌دهد که ساختار پیشنهاد شده می‏تواند 4 کد دیجیتال دوتایی بر پایۀ فرکانس‏های سیگنال نور ورودی تولید نماید. بنابراین ساختار طرّاحی شده می‏تواند به عنوان یک دی‏مدولاتور انتقالِ فرکانسی تمام‌نوری عمل کند و کدهای دو تایی 00، 01، 10 و 11 را  در خروجی تولید کند. حداکثر زمان تأخیر ساختار طرّاحی شده 4 ps است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Research Paper: Design and Simulation of All Optical Frequency Shift Keying Demodulator by Using Photonic Crystal based Resonant Cavities

نویسندگان [English]

  • Akram Asghari-Govar 1
  • Alireza Andalib 2
1 Assistant Professor, Department of Electrical Engineering, Ahar Branch, Islamic Azad University, East Azarbaijan, Ahar, Iran
2 Associate Professor, Department of Electrical Engineering, Tabriz Branch, Islamic Azad University, East Azarbaijan, Tabriz, Iran.
چکیده [English]

Using all optical devices for implementing all optical communication networks is very important. By using all optical frequency shift keying demodulators one can generate binary codes from the frequency of optical waves. In this paper a novel structure has been proposed for designing photonic crystal based all optical frequency shift keying demodulator. Three resonant cavities with different resonant modes were used for the frequency selecting section. In order to separate three different resonant modes, the radius of the defect rods used inside the cavities was chosen with different size. The simulation results show the proposed structure can generate four binary codes according to the frequency of the input optical waves. Therefore the final structure can work as an all optical frequency shift keying demodulator which can generate 00, 01, 10 and 11 codes at the output ports. The maximum delay time of the proposed structure is 4 ps.

کلیدواژه‌ها [English]

  • Photonic crystals
  • Demodulator
  • resonant cavity
  • Delay time
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