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Kousik Mukherjee 《Optik》2011,122(13):1188-1194
A novel frequency encoded all optical half adder, half subtractor and full adder are proposed. The implementation is ultrafast one and the frequency encoding makes it intensity loss dependent problem free. The use of polarization insensitive four-wave mixing makes the design polarization independent and the hardware simple. The frequency conversion by the reflective semiconductor optical amplifiers (RSOA) makes the design faster compared to other semiconductor optical amplifiers (SOA) based design. 相似文献
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A one-step algorithm for parallel negabinary addition of two negabinary numbers is achieved by minimizing the truth-table for the two-step algorithm. Without increasing the encoding cell size or adding complexity of the corresponding optical system, the proposed one-step scheme doubles the computation speed. The optical system can also be used to realize a one-step modified signed digit adder. Additionally, optical implementation of negabinary multiplication using this proposed one-step optical adder is discussed. 相似文献
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The paper presents an alternative novel approach to obtain all-optical logic. We show that XOR, NOT, and AND logic could be
obtained by appropriately setting parameter of all-optical passive transistor. An AND gate followed by NOT gives NAND logic
(building block) that, in principle can provide complete set of passive, fiber compatible “self-trapped family” all-optical
logic gates (with Boolean completeness) and may find many possibilities in the area of all-optical computing. To give one
example, we propose all-optical half adder. 相似文献
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Optical and Quantum Electronics - This paper aims at first deriving the general forms of the electromagnetic vector and scalar potentials inside a cylindrical wave-guide by placing a 3D-charged... 相似文献
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A fully functional optical pipeline adder based on systolic arrays and optical symbolic substitution (OSS) is demonstrated. By pupil division four OSS-rules are applied to a dataplane in one single optical path. The design concept includes the possibility of microintegration by adapting the modular system design to features of typical micro-optical devices. 相似文献
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An all-optical adder/subtractor (A/S) unit with the (TOAD) is proposed. The all-optical A/S unit with help of terahertz optical asymmetric demultiplexer a set of all-optical full-adders and optical exclusive- ORs (XORs), can be used to perform a fast central processor unit using optical hardware components. We try to exploit the advantages of TOAD-based optical switch to design an integrated all-optical circuit which can perform binary addition and subtraction. With computer simulation results confirming the described methods, conclusions are given. 相似文献
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Optical adder/subtractor for two four-bit frequency encoded binary numbers are proposed and designed based on four wave mixing, add drop multiplexing and frequency conversion in semiconductor optical amplifier. The input bits and the control input are intensity-modulated signal of two specific frequencies suitable for optical communication in the C band of wavelength. The device can distinguish negative and positive results and controlled operation are most promising in this proposal. The use of semiconductor optical amplifiers along with frequency encoding makes the system very fast and useful for future optical communication and computation systems. 相似文献
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An all-optical model of carry lookahead adder (CLA) implemented with a semiconductor optical amplifier (SOA)-assisted Sagnac interferometer (TOAD) is presented. The model accounts for the SOA small signal gain, linewidth enhancement factor, the switching pulses energy and width and the Sagnac loop asymmetry. Adder is a very basic component in a central processing unit. The CLA is the highest speed adder nowadays. Theoritical model is presented and verified through numerical simulation. The method promises both higher processing speed and accuracy. The model can be enhanced the functionality in which carry lookahead adder is the basic building block. 相似文献
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We propose and describe an all-optical prefix tree adder with the help of a terahertz optical asymmetric demultiplexer (TOAD) using a set of optical switches. The prefix tree adder is useful in compound adder implementation. It is preferred over the ripple carry adder and the carry lookahead adder. We also describe the principle and possibilities of the all-optical prefix tree adder. The theoretical model is presented and verified through numerical simulation. The new method promises higher processing speed and accuracy. The model can be extended for studying more complex all-optical circuits of enhanced functionality in which the prefix tree adder is the basic building block. 相似文献
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Arithmetic and algebraic operations are the most important part of optical computation and data processing. To implement the optical logic operations, different data encoding/decoding techniques have been reported. Frequency variant encoding/decoding technique is now performing a very faithful role in this regard. Frequency is the fundamental character of any signal and it remains unaltered in reflection, refraction, absorption, etc. during propagation and transmission of the signal. This is the most potential advantage of the frequency encoding technique over any other conventional encoding techniques. Here, in our proposed scheme of addition of binary bits made of two encoded frequencies in C-band (1535-1560 nm), the conjugate beam is generated in LiNbO3 waveguide using cascaded sum and difference frequency generation by the nonlinear interaction with a third frequency, exploiting the nonlinear response character of periodically poled LiNbO3 waveguide. The cross-gain modulation property of reflecting semiconductor optical amplifier (RSOA) has also been exploited here for frequency conversion purposes. 相似文献
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Single SOA based all-optical adder assisted by optical bandpass filter: Theoretical analysis and performance optimization 总被引:1,自引:0,他引:1
Jianji Dong Songnian Fu Xinliang Zhang P. Shum Liren Zhang Jing Xu Dexiu Huang 《Optics Communications》2007,270(2):238-246
A simple and compact configuration of all-optical adders implemented with a single semiconductor optical amplifier (SOA) and optical bandpass filter (OBF) is presented in this paper. A comprehensive SOA model is put forward to investigate the output characteristics of the all-optical adders. The numerical simulation results demonstrate the influence of these key parameters, including input pulse peak power, pulsewidth, repetition rate, and OBF characteristics. Moreover some design rules are extracted for the proper selection of these parameters so as to ensure optimum performance. The obtained results confirm the feasibility of our configuration. 相似文献
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We describe a superconducting device capable of producing laser light in the visible range at half of the Josephson generation frequency with the optical phase of the light locked to the superconducting phase difference. It consists of two single-level quantum dots embedded in a p-n semiconducting heterostructure and surrounded by a cavity supporting a resonant optical mode. We study decoherence and spontaneous switching in the device. 相似文献
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Mode-field half widths of Gaussian approximation for fundamental mode of two kinds of optical waveguides 下载免费PDF全文
This paper analyzes the characteristic of matching effciency between the fundamental mode of two kinds of optical waveguides and its Gaussian approximate field.Then, it presents a new method where the mode-field half-width of Gaussian approximation for the fundamental mode should be defined according to the maximal matching effciency method. The relationship between the mode-field half-width of the Gaussian approximate field obtained from the maximal matching effciency and normalized frequency is studied; furthermore, two formulas of mode-field half-widths as a function of normalized frequency are proposed. 相似文献
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一位全加器实验电路设计方法的研究 总被引:1,自引:1,他引:0
讨论了采用门电路、译码器、数据选择器和可编程逻辑陈列PLA,分别设计了4种一位全加器实验电路,并对各种设计方法进行了比较.这些方法对其他数字逻辑电路的设计具有指导作用. 相似文献
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