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检索条件"任意字段=Conference on Photonic Devices and Algorithms for Computing III"

共 215 条记录，以下是181-190 订阅

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Translation of decoupling circuits into photonic devices

Translation of decoupling circuits into photonic devices

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conference on photonic devices and algorithms for computing IV

作者： Giglmayr, J Kwanju Inst Sci & Technol Dept Informat & Commun Kwangju 500712 South Korea

ISBN: (纸本)081944555X

Several circuits, the following two are denoted by (A) and (B), are needed for decoupling of light-wave circuits (LWCs) and for a future transfer function matrix (TFM) synthesis of LWCs. (A) Controller matrix of a feedback (FB) which is an optical network composed of (i) variable weighted distributed FBs, implemented by electro-optically tunable gratings at waveguides (WGs) and (ii) optical isolators (OIs) or (iii) switches, respectively, for the correct flow of the optical field in the network. The controller matrix may be generalized to include space-variable elements according to a step function by step-wise arranged electrodes at the substrate of the gratings. Another generalization is the introduction of several wavelengths by subsequently arranged gratings of different spacing at the WGs of the controller matrix. The inclusion of such controller matrices at several wavelengths into a WDM switch requires various frequency converters (FCs) for the non-blocking operation. (B) Optical differentiator with regard to the longitudinal space coordinate of a WG which is composed of (i) reflection-type Mach-Zehnder interferometers (RMZIs) arranged at a (ii) fish-bone WG pattern for the implementation of the parallel RMZIs. The interleaved organization of the arms in (ii) provides the approximate differentiation of tile optical field in a WG. The application of (A) and (B) to the advanced control of couplers is proposed (derivative FB). The paper presents circuits and their principles rather than their evaluation. The final goal is the photonic integration of the presented decoupling circuits.

关键词： waveguide coupling decoupling distributed feedback output feedback derivative feedback tapering in 2-D tapering in 3-D (tunable) grating controller matrix reflection-type Mach-Zehnder interferometer difference scheme forward rule backward rule differentiation of the optical field in a waveguide

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Optical two-step modified signed-digit addition based on binary logic gates

Optical two-step modified signed-digit addition based on bin...

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conference on photonic devices and algorithms for computing IV

作者： Fyath, RS Alsaffar, AAW Alam, MS Univ Basrah Coll Engn Dept Elect Engn Basrah Iraq

ISBN: (纸本)081944555X

A new modified signed-digit (MSD) addition algorithm based on binary logic gates is proposed for parallel computing. It is shown that by encoding each of the input MSD digits and flag digits into a pair of binary bits, the number of addition steps can be reduced to two. The flag digit is introduced to characterize the next low order pair (NLOP) of the input digits in order to suppress carry propagation. The rules for two-step addition of binary coded MSD (BCMSD) numbers are formulated that can be implemented using optical shadow-casting logic system.

关键词： Binary data Logic Logic devices Computer programming Composites Prisms Light emitting diodes Optical logic Spatial light modulators Parallel computing

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Nonrecoded trinary signed-digit multiplication based on digit grouping and pixel assignment

Nonrecoded trinary signed-digit multiplication based on digi...

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conference on photonic devices and algorithms for computing IV

作者： Fyath, RS Alsaffar, AAW Alam, MS Univ Basrah Coll Engn Dept Elect Engn Basrah Iraq

ISBN: (纸本)081944555X

A two-step trinary signed-digit (TSD) multiplication technique based on digit grouping and smart pixel assignment is proposed. In this technique, the partial products are generated directly without recoding the TSD numbers. This nonrecoding based TSD multiplication technique results in significant reduction in the number of symbolic substitution rules employed in the algorithm. Several spatial encoding schemes are introduced and their relative performance in the presence of additive noise is discussed.

关键词： Computer programming Symbolic substitution Optical correlators computing systems Spatial light modulators Chemical elements Detection and tracking algorithms Electrical engineering Optoelectronics Electrochemical etching

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Logic Cells as basic structures to add/drop WDM information signals

Logic Cells as basic structures to add/drop WDM information ...

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conference on photonic devices and algorithms for computing IV

作者： Martin-Pereda, JA González-Marcos, A Univ Politecn Madrid ETS Ingn Telecomunicac E-28040 Madrid Spain

ISBN: (纸本)081944555X

Nowadays, in order to take advantage of fiber optic bandwidth, any optical communications system tends to be WDM. The way to extract a channel, characterized by a wavelength, from the optical fiber is to filter the specific wavelength. This gives the systems a low degree of freedom due to the fact of the static character of most of the employed devices. In this paper we will present a different way to extract channels from an optical fiber with WDM transmission. The employed method is based on an Optically Programmable Logic Cells (OPLC) previously published by us, for other applications as a chaotic generator or as basic element for optical computing. In this paper we will describe the configuration of the OPLC to be employed as a dropping device. It acts as a filter because it will extract the data carried by a concrete wavelength. It does depend, internally, on the wavelength. We will show how the intensity of the signal is able to select the chosen information from the line. It will be also demonstrated that a new idea of redundant information it is the way of selecting the concrete wavelength. As a matter of fact this idea is apparently the only way to use the OPLC as a dropping device. Moreover, based on these concepts, a similar way to route signals to different routes is reported. The basis is the use of photonic switching configurations, namely Batcher or Bayan structures, where the unit switching cells are the above indicated OPLCs.

关键词： photonic switching optical computing add-drop WDM

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On the distinction between entangled and separable states of quantum registers 2

On the distinction between entangled and separable states of...

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2nd IEEE conference on Nanotechnology

作者： Jorrand, P Mhalla, M Leibniz Lab Grenoble France

ISBN: (纸本)0780375386

Quantum computing operates in three stages: (i) preparation of the initial states of the n qubits of a register, (ii) step by step transformation of the state of this register by unitary operators which compose the quantum program, and (iii), measurement of all or some of the qubits of the register. The existence of quantum algorithms which are exponentially less complex than their classical counterparts for sonic classes of problems, stems from entangled states established by multi-qubit unitary operators within the quantum program. A register of it qubits is a quantum system composed of n quantum subsystems. The state \psi> of a quantum system composed of two quantum subsystems A and B is said to be entangled when \Psi> is not reducible to a pair composed of a state \Psi(A)> of A and a state \Psi(B)> of B: such situations have no counterpart in the classical world. In quantum theory, such a pair of states is denoted by a tensor product: \Psi> is entangled if it cannot be factorized into the tensor product \Psi(A)>circle times\Psi(B)>. This paper establishes conditions according to which it is possible to tell whether or not the state of a register of it qubits is entangled. The state of a single qubit is a vector a alpha\0> + beta\1> of unit norm in a 2-dimensional vector space, where \0> and \1> are the two basis states and where alpha and beta are complex amplitudes. Then, if both A and B are qubits, the most general form of the state of a register composed of the 2 qubits A and B is also a vector of unit norm, but now in a 4-dimensional space: \Psi>=alpha\00>+beta\01>+gamma\10>+delta\11>. It is straightforward to prove that \Psi>) can be factorized into \Psi(A)>circle times\Psi(B)> if and only if alphadelta=betagamma. In such a case, \Psi>is said to be separable, i.e. not entangled. This paper generalizes this form of condition to registers of it qubits. If \Psi> is the state of a register of n qubits, two different questions about the separability of \Psi>,) a

关键词： Computer hacking Cryptography Information processing Laboratories Quantum computing Quantum entanglement Quantum mechanics Registers Teleportation Tensile stress

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photonic devices and algorithms for computing iii

Photonic devices and algorithms for computing III

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photonic devices and algorithms for computing iii

The proceedings contains 26 papers from the conference on photonic devices and algorithms for computing iii. Topics discussed include: legacy of optical information processing;planar-waveguide-type optical switching devices;optoelectronic techniques for real-time pattern recognition;strange attractor in optical logic cells and training an associative memory model for character recognition.

关键词： Optical data processing

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Erratum: (photonic devices and algorithms for computing iii (29-30 July 2001))

Proceedings of SPIE - The International Society for Optical ...

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Proceedings of SPIE - The International Society for Optical Engineering 2001年 4470卷 239-239页

作者： Iftekharuddin, Khan M. Awwal, Abdul Ahad S.

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Fast optoelectronic multiplication using VLSI spatial light modulator and CCD detector

Fast optoelectronic multiplication using VLSI spatial light ...

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conference on photonic devices and algorithms for computing iii

作者： Awwal, AAS Salam, MA Wright State Univ Dept Comp Sci & Engn Dayton OH 45435 USA

Optical matrix multiplication is generally carried out in the analog domain. In this work, we present a digital domain technique for multiplication using VLSI SLMs and CCD detectors.

ISBN: (纸本)0819441848

Optical matrix multiplication is generally carried out in the analog domain. In this work, we present a digital domain technique for multiplication using VLSI SLMs and CCD detectors.

关键词： Binary data Sensors Spatial light modulators Charge-coupled devices Analog electronics CCD image sensors Optical computing Optoelectronics CCD cameras Very large scale integration

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Design of a fiber optical integrator for optical computing

Design of a fiber optical integrator for optical computing

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conference on photonic devices and algorithms for computing iii

作者： Tsao, SL Chiou, SC Hsu, CY Yuan Ze Univ Dept Elect Engn Chungli Taiwan

ISBN: (纸本)0819441848

We present a novel optical integrator with a semiconductor optical amplifier (SOA) and an infinite impulse response fiber optical loop filter in this paper. Adjusting the filter parameters, we can achieve an integrator that can execute integration in a short pulse period. Because the infinite impulse response filter includes a 2x2 electro-optical (E/O) switch, the pulse shape after the integration can be varied according to an external driving voltage. According to the calculation result, the gain coefficient of SOA can provide a design flexibility for approaching a real integration.

关键词： optical integrator semiconductor optical amplifier (SOA) infinite impulse response fiber optical loop filter 2x2 electro-optical (E/O) switch

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Generalized look-ahead number conversion from signed-digit to complement representation with optical logic operations

Generalized look-ahead number conversion from signed-digit t...

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conference on photonic devices and algorithms for computing iii

作者： Qian, F Li, GQ Acad Sinica Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China

ISBN: (纸本)0819441848

In this paper a generalized look-ahead logic algorithm for number conversion from signed-digit to its complement representation is developed. By property encoding the signed digits, all the operations are performed by binary logic, and unified logical expressions can be obtained for conversion from modified-signed-digit (MSD) to 2's complement, trinary signed-digit (TSD) to 3's complement, and quarternary signed-digit (QSD) to 4's complement. For optical implementation, a parallel logical array module using electron-trapping device is employed, which is suitable for realizing complex logic functions in the form of sum-of-product. The proposed algorithm and architecture are compatible with a general-purpose optoelectronic computing system.

关键词： Logic Binary data Computer programming Algorithm development Optical logic computing systems Computer architecture Ions Optoelectronics Optical arrays

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