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检索条件"任意字段=Photonic Devices and Algorithms for Computing V"

共 20 条记录，以下是11-20 订阅

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photonic devices and algorithms for computing v (Proceedings of Spie, 5201)

Photonic Devices and Algorithms for Computing V (Proceedings...

引用

2003年

作者： Khan Mohamma Iftekharuddin

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Proceedings of SPIE - photonic devices and algorithms for computing v

Proceedings of SPIE - Photonic Devices and Algorithms for Co...

引用

photonic devices and algorithms for computing v

The proceedings contains 22 papers from the conference of Proceedings of SPIE - photonic devices and algorithms for computing v. Topics discussed include: customizing a similarity filter for object recognition;optical calibration of a new two-way optical component network analyzer;a novel multiple-output and multiwavelength fiber ring optical laser;application of phase-only filter on electronic nose data and symmetric color separation gratings.

关键词： Optical switches

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Detection of off-normal images for NIF automatic alignment

Detection of off-normal images for NIF automatic alignment

引用

SPIE - The International Society for Optical Engineering

作者： Candy, James v. Awwal, Abdul A. S. Mcclay III, Wilbert A. Ferguson, S. Walter Burkhart, Scott Livermore CA 94526

One of the major purposes of National Ignition Facility at Lawrence Livermore National Laboratory is to accurately focus 192 high energy laser beams on a nanoscale (mm) fusion target at the precise location and time. The automatic alignment system developed for NIF is used to align the beams in order to achieve the required focusing effect. However, if a distorted image is inadvertently created by a faulty camera shutter or some other opto-mechanical malfunction, the resulting image termed "off-normal" must be detected and rejected before further alignment processing occurs. Thus the off-normal processor acts as a preprocessor to automatic alignment image processing. In this work, we discuss the development of an "off-normal" pre-processor capable of rapidly detecting the off-normal images and performing the rejection. Wide variety of off-normal images for each loop is used to develop the criterion for rejections accurately.

关键词： Imaging techniques

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photonic delay line architecture using MEMS based photonic switch

Photonic delay line architecture using MEMS based photonic s...

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Conference on photonic devices and algorithms for computing v

作者： Yuan, SF Creolight Technol Santa Barbara CA 93110 USA

ISBN: (纸本)081945074X

photonic true time delay is very important for phased array antenna applications. The conventional photonic delay line architectures have very high insertion loss. Therefore, the deployment of these photonic delay lines for phased array antennas is not cost effective. In this paper, we will review and compare the performance of different fiber optic photonic delay line architectures. To explore the application of MEMS mirror for photonic true time delay, a multi-base photonic delay line architecture is employed because this architecture has the potential to exhibit ultra-low loss for large binary bit photonic delay. Approaches to implement this photonic delay line architecture based on optical MEMS mirror technology have been proposed and theoretically analyzed. The proposed photonic delay line approaches may provide an ultra-low loss, module, low cost, and deployable photonic delay line for phased array beam forming applications.

关键词： photonic delay line true time delay beam forming phased array antenna RF photonics fiber optics RF signal processing

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FDTD simulation of an 1x2 beam splitter using photonic bandgap on SOI wafer

FDTD simulation of an 1x2 beam splitter using photonic bandg...

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Conference on photonic devices and algorithms for computing v

作者： Tsao, SL Yang, LC Huang, HC Hu, SF Natl Taiwan Normal Univ Opt Fiber Syst Lab Inst Electroopt Sci & Technol Taipei 116 Taiwan

ISBN: (纸本)081945074X

We present a novel design of an 1X2 photonic crystal beam splitter using silicon-on-insulator integrated optical technology. According to the design, we can reduce the size of beam splitter without increasing the propagation loss. In this paper, we study the 1X2 beam splitting ratio by changing the position of the center air hole. We use a finite-difference-time-domain (FDTD) method to simulate the propagation of the light. The 1x2 PBG beam splitter is designed with 180 degree output bending angles. The size of this novel beam splitting device are 8mum x 3.44mum.

关键词： photonic crystal splitter silicon-on-insulator (SOI) finite-difference-time-domain (FDTD)

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Digit-set-restricted modified signed-digit arithmetic based on optoelectronic shared content-addressable memory

Digit-set-restricted modified signed-digit arithmetic based ...

引用

Conference on photonic devices and algorithms for computing v

作者： Qian, F Li, G Alam, MS Karim, MA Chinese Acad Sci Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China

ISBN: (纸本)081945074X

For efficient optoelectronic implementation of parallel algorithms, a novel two-step digit-set-restricted modified signed-digit (MSD) arithmetic based on content-addressable-memory is presented. With the introduction of the reference digits, carry propagation is avoided by restricting digit sets of the intermediate carry and sum into {(1) over bar ,0} and {0, 1}, respectively. In our new algorithm, without using the complement property for the nonzero outputs, only 12 minterms for all the outputs are required. More significantly, since no complement operation is involved, the optical system needs no additional reflecting unit and mask. An incoherent correlator based optoelectronic shared-content-addressable-memory processor is used to perform the arithmetic operations. A proof-of-the-principle experiment is demonstrated.

关键词： optical computing modified signed-digit representation shared content-addressable memory

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Recent advances in optical MEMS devices and systems

Recent advances in optical MEMS devices and systems

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Conference on photonic devices and algorithms for computing Iv

作者： Patterson, PR Hah, D Lee, MMC Tsai, JC Wu, MC Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA

ISBN: (纸本)081944555X

We have developed novel optical micro-electro-mechanical systems, (MEMS) and nano-electro-mechanical, (NEMS) optical components for applications including imaging, switching, and optical integrated circuits. This paper provides an overview of current optical MEMS/NEMS research projects in our integrated photonics laboratory at UCLA. Three optical MEMS/NEMS devices: a large, 1 mm diameter, scanning micromirror for imaging applications, an analog micromirror array for network switching applications, and a nanoscale photonic crystal switch for integrated photonic circuit applications will be described.

关键词： angular vertical combdirve micromirrors MEMS NEMS optical scanner optical switch photonic crystal photonic bandgap SOI-MEMS SUMMiT-v WDM

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Free-space optical interconnection modules for 2-D photonic-vLSI circuitry based on microlenses and GRINs.

Free-space optical interconnection modules for 2-D photonic-...

引用

Conference on photonic devices and algorithms for computing II

作者： Baukens, v Cox, WR Guan, C Ottevaere, H Buczynski, R Goulet, A veretennicoff, I Thienpont, H Free Univ Brussels Dept Appl Phys & Photon B-1050 Brussels Belgium

ISBN: (纸本)081943759X

In this paper we present different configurations for a compact free-space optical interconnection (FSOI) module by combining two radial gradient refractive index lenses (GRIN) and/or two arrays of refractive microlenses. Based on our findings with ray-tracing and radiometric analysis we discuss how we have selected the proper optical system configurations and how we have chosen the different design parameters to optimally accommodate different types of opto-electronic emitters such as LEDs, micro-cavity LEDs and vCSELs. We hereby focused on maximizing optical coupling efficiencies and misalignment tolerances while minimizing inter-channel cross-talk Furthermore we discuss the experimental optical characteristics of two such prototype modules that we completed together with the first experimental results of their use in parallel data communication demonstrator systems.

关键词： free space digital optics optical interconnects photonic-vLSI GRIN lenses lens design refractive microlenses

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Low driving voltage electrooptic polymer modulators for advanced photonic applications

Low driving voltage electrooptic polymer modulators for adva...

引用

Conference on photonic devices and algorithms for computing II

作者： Bechtel, JH Shi, YQ IPITEK Carlsbad CA 92008 USA

ISBN: (纸本)081943759X

The rapid development of ultra-wide bandwidth fiber optical communications networks has challenged circuit designers to obtain ever-increasing link gain-bandwidth products with new electro-optic modulators. As the link bandwidth increases, high power modulator drivers become very costly and have low efficiency. To overcome the limited gain-bandwidth product, it is important to reduce the required driving voltage or the so-called halfwave voltage of current electro-optic modulators. In this paper, we report results on new polymeric electro-optic modulators with a halfwave voltage of 0.8v and a halfwave voltage-interaction length product of 2.2v-cm. The low driving voltage allows electro-optic modulators to be driven directly by high-speed logic circuits without an amplifier. The driving electronics and the system cost can be significantly reduced when these modulators are implemented. Here, low halfwave voltage modulators are based on recent developments in materials and modulator fabrication technologies. The incorporation of a new second-order nonlinear optical chromophore CLD-1 in a poly(methylmethacrylate) matrix has a demonstrated electrooptic coefficient similar to 60 pm/v at 1318 nm wavelength. Using this material system and an optical push-pull modulator design, sub-1 volt Mach-Zehnder modulators were demonstrated with 3 cm interaction length. The material system, device fabrication, initial characterization, thermal and temporal stability of these modulators will be reported.

关键词： modulator optical communications fiber optics integrated optics electro-optics

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Plastic micro-optical modules for high throughput inter-chip optical interconnections

Plastic micro-optical modules for high throughput inter-chip...

引用

Conference on photonic devices and algorithms for computing II

作者： Thienpont, H Baukens, v Ottevaere, H volckaerts, B Debaes, C vervaeke, M Tuteleers, P vynck, P Hermanne, A Hanney, M Brunfaut, M van Campenhout, JM veretennicoff, I Free Univ Brussels Dept Appl Phys & Photon B-1050 Brussels Belgium

ISBN: (纸本)081943759X

We report on the design, the fabrication, the characterization and the demonstration of scalable multi-channel free-space interconnection components with the potential for Tb/***(2) aggregate bit rate capacity over inter-chip interconnection distances. The demonstrator components are fabricated in a high quality optical plastic, PMMA, using an ion-based rapid prototyping technology that we call deep proton lithography. With the presently achieved Gigabit/s data rates for each of the individual 16 channels with a BER smaller than 10(-13) and with inter-channel cross-tall;lower than -22dB the module aims at optically interconnecting 2-D opto-electronic vCSEL and receiver arrays, flip-chip mounted on CMOS circuitry. Furthermore, using ray-tracing software and radiometric simulation tools, we perform a sensitivity analysis for misalignment and fabrication errors on these plastic micro-optical modules and we study industrial fabrication and material issues related to the mass-replication of these components through injection-molding techniques. Finally we provide evidence that these components can be mass-fabricated in dedicated, highly-advanced optical plastics at low cost and with the required precision.

关键词： Micro-Opto-Mechanical-Systems optical interconnects vCSELs plastics deep proton lithography

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