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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...

引用

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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Quantum photonic informatics: an overview of theoretical development and implementation via integrated photonics

Quantum photonic informatics: an overview of theoretical dev...

引用

conference on photonics Technology in the 21st Century

作者： Binh, LN Monash Univ Dept Elect & Comp Syst Engn Lab Opt Commun & Appl Photon Clayton Vic 3800 Australia

ISBN: (纸本)081944328X

Quantum photonic informatics involves manipulation and processing of information at a photon energy level. The qu-bit with optical modes containing one photon energy is described and photonic gates representing its quantum states are given and expanded into quantum systems and networks for computing and information processing. Integrated photonic devices are proposed for implementation of the quantum gates and networks and case studies are examined for further expansion and implementation of quantum algorithms.

关键词： quantum computing quantum information processing integrated photonics integrated optics informatics

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Advancements in conductive cladding materials for nonlinear optic polymer based optoelectronic devices

Advancements in conductive cladding materials for nonlinear ...

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conference on photonic devices and algorithms for computing III

作者： Grote, JG Zetts, JS Nelson, RL Hopkins, FK Huddleston, JB Yaney, PP Zhang, C Steier, WH Oh, MC Fetterman, HR Jen, AKY Dalton, LR USAF Res Lab Mat Mfg Directorate MLPS Wright Patterson AFB OH 45433 USA

ISBN: (纸本)0819441848

We have investigated various conductive and non-conductive polymers suitable for use as cladding layers in nonlinear optic (NLO) polymer based opto-electronic devices. Our goal was to maximize the nonlinearity of the core material, minimize the total poling voltage, and minimize the absorption loss. Using a cladding material that is more conductive than the NLO core material, the majority of the applied poling voltage is dropped across the core, realizing a maximum EO coefficient with minimum applied voltage. We found, however, that there are tradeoffs between absorption loss, conductivity, refractive index, materials processability and materials compatibility when using off-the-shelf materials.

关键词： Cladding Polymers Nonlinear optics Polymethylmethacrylate Photoresist developing Photoresist materials Refractive index Electro optic polymers Electrodes Gold

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Planar-waveguide-type optical switching devices

Planar-waveguide-type optical switching devices

引用

conference on photonic devices and algorithms for computing III

作者： Ooba, N Okuno, M NTT Corp NTT Photon Labs Atsugi Kanagawa Japan

ISBN: (纸本)0819441848

This paper reviews our recent work on various planar-waveguide-type optical switching devices. Specifically we investigated N x N thermo-optic (TO) matrix switches. The matrix switch consists of N-2 switching units and the switching unit has two cascaded Mach-Zehnder interferometers (MZIs). Switching is achieved by using a phase control technique based on the TO effect. The switching power of an MZI unit and the switching speed are typically 0.4 W and 2 ms, respectively. For N = 16, we realized non-blocking connection with a very low-loss of 6.6 dB and a high-extinction ratio of 55 dB. We have also developed I x N configuration switches for use in optical path cross-connect systems. By integrating TO switches and arrayed-waveguide grating multi/demultiplexers, we fabricated single-chip optical add/drop multiplexers (OADM) for use in all-optical wavelength division multiplexing (WDM) routing systems. We have developed a power consumption reduction technique that is effective for all MZI TO switches as regards large scale integrated switch applications.

关键词： optical waveguide optical switch PLC WDM

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Optical multi-token-ring networking using smart pixels with field programmable gate arrays (FPGAs)

Optical multi-token-ring networking using smart pixels with ...

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conference on photonic devices and algorithms for computing III

作者： Zhang, LP Hong, SW Min, CK Alpaslan, ZY Sawchuk, AA Univ So Calif Inst Signal & Image Proc Los Angeles CA 90089 USA

ISBN: (纸本)0819441848

This research explores architectures and design principles for monolithic optoelectronic integrated circuits (OEICs) through the implementation of an optical multi-token-ring network testbed system. Monolithic smart pixel CMOS OEICs are of paramount importance to high performance networks, communication switches, computer interfaces, and parallel signal processing for demanding future multimedia applications. The general testbed system is called Reconfigurable Translucent Smart Pixel Array (R-Transpar) and includes a field programmable gate array (FPGA), a transimpedance receiver array, and an optoelectronic very large-scale integrated (OE-VLSI) smart pixel array. The FPGA is an Altera FLEX10K100E chip that performs logic functions and receives inputs from the transimpedance receiver array. A monolithic (OE-VLSI) smart pixel device containing an array of 4 x 4 vertical-cavity surface-emitting lasers (VCSELs) spatially interlaced with an array of 4 x 4 metal-semiconductor-metal (MSM) detectors connects to these devices and performs optical input-output functions. These components are mounted on a printed circuit board for testing and evaluation of integrated monolithic OEIC designs and various optical interconnection techniques. The system moves information between nodes by transferring 3-D optical packets in free space or through fiber image guides. The R-Transpar system is reconfigurable to test different network protocols and signal processing functions. In its operation as a 3-D multi-token-ring network, we use a specific version of the system called Transpar-Token-Ring (Transpar-TR) that uses novel time-division multiplexed (TDM) network node addressing to enhance channel utilization and throughput. Host computers interface with the system via a high-speed digital I/O board that sends commands for networking and application algorithm operations. We describe the system operation and experimental results in detail.

关键词： optical interconnections optical computing smart pixels optoelectronic integrated circuits vertical-cavity surface-emitting lasers

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Herd male genetic algorithm

Herd male genetic algorithm

引用

conference on photonic devices and algorithms for computing II

作者： Caulfield, HJ Phys Opt Corp Nashville TN 37208 USA

ISBN: (纸本)081943759X

There are two extremes in optimization with little ground between them. They are local optimization and global optimization. Local optimization is normally very fast, but the optimum it finds may be far from the best (global) optimum. Global optimization is very slow, but it gives the best optimum - at least in principle. Using mammal herds as rough models, we suggest a new evolutionary method that has aspects of both and achieves intermediate results most of the time: faster-than-global convergence with better-than-local performance.

关键词： Genetic algorithms Fourier transforms Optical filters Performance modeling algorithms Chemical elements Genetics Optimization (mathematics) photonic devices Stochastic processes

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Parallel computing systems using integrated optoelectronic devices

Parallel computing systems using integrated optoelectronic d...

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conference on photonic devices and algorithms for computing II

作者： Ishikawa, M Univ Tokyo Grad Sch Engn Dept Math Engn & Informat Phys Bunkyo Ku Tokyo 1138656 Japan

ISBN: (纸本)081943759X

Optical interconnections and integrated optoelectronic devices are expected to be promising candidates that solve the lack of interconnection bandwidth between large-scale integrated circuits (LSIs). However, although two-dimensional parallel devices such as vertical-cavity surface-emitting lasers (VCSELs) and spatial light modulators (SLMs) have massive parallelism, their capabilities are not fully utilized without appropriate way to yields high speed processing. From the viewpoint of system and algorithm, the improvement of the physical layer by optical technologies should require the reconsideration of the architectural design and algorithms so that enough performance improvements could be obtained. In this paper, we will present several of our optoelectronic parallel computing systems including a two-layer pipelined parallel system, which is called OCULAR-II. The system uses VCSELs and phase modulation SLM for realizing free-space reconfigurable optical interconnects. The algorithmic approach is discussed including the optimal load allocation for optically interconnected systems and a novel database management algorithm. As one of the most important technological challenges, the alignment problem of optical beam is also investigated.

关键词： parallel computing integrated optical devices optical interconnection VCSEL SLM

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One-step trinary signed-digit arithmetic using an efficient encoding scheme

One-step trinary signed-digit arithmetic using an efficient ...

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conference on photonic devices and algorithms for computing II

作者： Salim, WY Fyath, RS Ali, SA Alam, MS Univ Basrah Coll Sci Dept Comp Sci Basrah Iraq

ISBN: (纸本)081943759X

The trinary signed-digit (TSD) number system is of interest for ultrafast optoelectronic computing systems since it permits parallel carry-free addition and borrow-free subtraction of two arbitrary length numbers in constant time. In this paper, a simple coding scheme is proposed to encode the decimal number directly into the TSD form. The coding scheme enables one to perform parallel one-step TSD arithmetic operation. The proposed coding scheme uses only a 5-combination coding table instead of the 625-combination table reported recently for recoded TSD arithmetic technique.

关键词： optoelectronic computing trinary signed-digit encoding carry-free addition borrow-free subtraction

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photonic time-stretching of 102 GHz millimeter waves using 1.55 μm polymer electro-optic modulator

Photonic time-stretching of 102 GHz millimeter waves using 1...

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conference on photonic devices and algorithms for computing II

作者： Fetterman, HR Chang, DH Erlig, H Oh, MC Zhang, C Steier, WH Dalton, LR Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA

ISBN: (纸本)081943759X

photonic time-stretch has been proposed as a signal preprocessor to perform A/D conversion in otherwise inaccessible high frequency regimes. We have demonstrated time-stretching of MM-wave signals at frequencies up to 102 GHz down to 11GHz, using an electrooptic modulator fabricated with the new polymer material PC-CLD. This application takes advantage of the inherent wideband capabilities of the PC-CLD material system, which has also demonstrated good optical insertion loss and high non-linearity at 1.55 mum. The dispersion penalty inherent to time-stretching imposes an additional bandwidth limit to that imposed by the modulator. A single-sideband modulator configuration is proposed to reduced the effect of this penalty.

关键词： photonic time-stretch polymer modulators electro-optic modulators PC-CLD A/D conversion

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