Source: http://opticjourn.ru/vipuski/1636-opticheskij-zhurnal-tom-84-12-2017.html
Timestamp: 2019-04-18 19:26:07+00:00

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An optical NOR gate is presented based on two different cross waveguide structures in 2D photonic crystal. The two different cross waveguide structures are logic NOT and OR gate. The layout of logic NOT and OR gate are simulated and analysed individually using Finite Difference Time Domain method. The structure is optimized by iterative process. The contrast ratio for logic NOT gate is 11.605 dB and for OR gate is 22.113 dB. The size of NOT and OR structures are 1010 m. With the optimized parameters, both the gates are combined without using any external device to design the NOR gate. The operation of NOR gate is numerically demonstrated using FDTD simulation. The contrast ratio is 15.97 dB for NOR gate. Since non linear material is not used, the power consumption is less. This NOR structure has an operating bandwidth of 40 nm. Thus, it is favorable for use in optical communication system and optical signal processor.
Keywords: photonic crystals, photonic crystal waveguides, photonic bandgap matials, optical logic devices.
Рассмотрен оптический вентиль ИЛИ-НЕ, основанный на двух различных пересекающихся волноводных структурах в двумерном фотонном кристалле. Два отдельных пересекающихся волновода представляют собою логические вентили НЕ и ИЛИ. Схемы логических устройств НЕ и ИЛИ индивидуально промоделированы и проанализированы с использованием метода конечных разностей во временнóй области (FDTD). Структуры были оптимизированы посредством итерационного процесса. Контрастное отношение логического вентиля НЕ составило 11.605 дБ, а вентиля ИЛИ — 22.113 дБ. Размеры структур НЕ и ИЛИ составляли 1010 мкм. После оптимизации параметров оба вентиля комбинировались без использования каких-либо внешних устройств, образуя ячейку ИЛИ-НЕ. Работа вентиля ИЛИ-НЕ численно моделировалась, используя ту же методику FDTD. Контрастное отношение для ячейки ИЛИ-НЕ составило 15.97 дБ. Поскольку устройство не использует нелинейных материалов, энергопотребление его уменьшено. Рассмотренная структура ИЛИ-НЕ обладает рабочей шириной спектральной области, равной 40 нм. Таким образом, устройство является перспективным для использования в оптических системах передачи информации и обработки сигналов.
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