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

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Combination of CPW-PBG cell for achieving three band frequency division multiplexer

Combination of CPW-PBG cell for achieving three band frequen...

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conference on photonic devices and algorithms for computing viii

作者： Weng, Mao-Tung Lee, Wen-Ching Chiang, Chia-Chin Tsao, Shyh-Lin Natl Taiwan Normal Univ Inst Electroopt Sci & Technol Opt Fiber Syst Lab Taipei Taiwan

ISBN: (纸本)0819463892

In this paper, we propose a novel Coplanar Waveguide (CPW) Frequency Division Multiplexer (FDM) using photonic Band Gap (PBG) cell concept. The output frequency and phase responses of these FDMs are also demonstrated. The output frequency bands of our designed one by three FDM include: 1.1 GHz similar to 2.1 GHz, 1.9 GHz similar to 3.7 GHz, 4.4 GHz similar to 7.3 GHz;three various ranges. The theoretical analysis and experimental results show good coincidence. The three-band PBG-CPW FDM can be effectively size reduced for achieving monolithic microwave integrated circuits (MMIC) in the future. In other words, this FDM component can be more widely and flexibly applied in microwave communication system.

关键词： coplanar waveguide (CPW) frequency division multiplexer (FDM) photonic bandgap (PBG)

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Design of photonic switching function of 32x32 arrayed waveguide grating

Design of photonic switching function of 32x32 arrayed waveg...

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conference on photonic devices and algorithms for computing viii

作者： Ko, Chih-Ham Lin, Chien-Hung Chiang, Chia-Chin Tsao, Shyh-Lin Natl Taiwan Normal Univ Inst Electroopt Sci & Technol Opt Fiber Syst Lab 88 Sect 4Ting Chou Rd Taipei 116 Taiwan

ISBN: (纸本)0819463892

Dense wavelength division multiplexing (DWDM) networks are very attractive with applying development of arrayed-waveguide grating (AWG) N x N multiplexers. This AWG multiplexer device plays an important role in WDM networks because of its unique N input and N output geometry. We design and analyze an integrated 32x32 arrayed waveguide grating wavelength switch based on SOI waveguides. We demonstrate three application of 32x32 arrayed waveguide grating, such as: Multiplexing/Demultiplexing, Optical add/drop multiplexing (OADM) and wavelength switch. The 32x32 arrayed waveguide grating is designed with including phase modulator. The simulation result and working principle for output channel wavelength shift is matched. In order to improve AWG switch, we integrate AWG switch and multimode interference (MMI). AWG with MMI switch coupler was connected at the end of the input waveguide. Beam propagation method with FDTD method are utilized for simulation works. The deviation of crosstalk and insertion loss value is small, and specifically the crosstalk is lower than -30 dB.

关键词： arrayed waveguide grating (AWG) optical switch silicon on insulator (SOI) multimode interference (MMI)

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50GHz optical pulse generation for synchronization of high speed computing signals

50GHz optical pulse generation for synchronization of high s...

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conference on photonic devices and algorithms for computing viii

作者： Yang, Yu-Wei Chu, Pei-Yuan Chiang, Chia-Chin Tsao, Shyh-Lin Natl Taiwan Normal Univ Inst Electroopt Sci & Technol Opt Fiber Syst Lab 88 Ting Choui RdSec 4 Taipei 116 Taiwan

ISBN: (纸本)0819463892

High-speed optical synchronization signal generation high speed computer is very important. The rational harmonic (RH) modelocking scheme is a useful technology to generate pulses at a repetition rate higher than the modulation frequency. In this paper, we design an amplitude modulated mode-locked figure eight fiber laser as a 50 GHz: optical pulse. In the cavity of high speed laser source, we utilize an amplitude modulator and phase modulator to inject additive modulation signal respectively. The modulation signal can let the longitudinal mode in cavity produce constructive interference, and then, achieve small modulation signal to excite harmonic and rational mode-locked laser in high repetition rate. The pulsewidth is 13.1ps with feeding a 16.4dBm, 12.5002248GHz modulation signal to the amplitude modulator. The pulsewidth, rise time and falling time of the 50GHz optical pulse are adjustable under experimental verification. In optical transmission systems, we consider the 50GHz optical pulse used in the optical interconnection transmission analysis.

关键词： repetition rate rational harmonic (RH) modelocking round trip time amplitude modulated

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Multi-phonon scattering of light with direct transitions between optical modes in uniaxial single crystals and its application to an all-optical computing

Multi-phonon scattering of light with direct transitions bet...

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conference on photonic devices and algorithms for computing VI

作者： Shcherbakov, AS Rodriguez, ET Lopez, AA Natl Inst Astrophys Opt & Elect Puebla 72000 Mexico

ISBN: (纸本)081945494X

A specific case of a multi-phonon non-collinear light scattering in optically uniaxial media is presented. Compared to our previous studies, an innovation lies in the fact that now we consider passing just the quartet of incident light beams through a single crystal that is perturbed by the triplet of coherent acoustic waves. The exact and closed analytical model for describing this strongly nonlinear phenomenon is developed. In fact, specially designed regime of a four-order light scattering whit direct coupling of all the light modes, when transitions of four input light beams into four output light modes are allowed and electronically controlled, is examined. The feasibility of applying such an effect to an all-optical computing and performing an all-optical adder is analyzed.

关键词： all-optical computing logic-based data processing acousto-optical device

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Simulation of photonic crystals antenna using ADI-FDTD method

Simulation of photonic crystals antenna using ADI-FDTD metho...

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conference on photonic devices and algorithms for computing VI

作者： Wu, ZZ Zhong, XX Yu, WG Chen, Y Chongqing Univ Dept Optoelect Engn Chongqing 400044 Peoples R China

ISBN: (纸本)081945494X

In order to meet the demand for miniaturization and excellent performances of antennas to send and receive the wireless signals, in this paper a novel photonic Band Gap (PBG) structure of a two-dimensional square lattice array etched on one side of silicon wafer is proposed as the grounds of a microstrip patch antenna. An analysis of the performance of a patch antenna with a PBG ground has been carried out, then two rectangle MEMS microstrip antennas with a conventional and a PBG ground respectively, are designed, while the alternating direction implicit finite-difference time-domain (ADI-FDTD) is adopted to perform time simulations of Gaussian pulse propagation in the microstrip antennas, as a result of the versatile method, the frequency-dependent scattering parameters and input impedance could be derived. An important reduction of the surface waves in the PBG antenna has been observed in the simulations, which consequently leads to an improvement of the antenna efficiency and bandwidth. Subsequently, the MEMS PBG antenna is micromachined and measured, and the simulation characteristics are verified by the measured curves of the MEMS PBG antenna. The measured peak return loss of PBG patch antenna is -21dB at 5.36GHz, and the bandwidth of 8.5%, which is three times wider than that of the conventional patch, therefore the gain and the bandwidth are enhanced by means of PBG process.

关键词： PBG structure microstrip antenna ADI-FDTD simulation MEMS

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Optical implementations of threshold decomposition and morphological operations with dual-rail processing

Optical implementations of threshold decomposition and morph...

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conference on photonic devices and algorithms for computing VI

作者： Buczynski, R Szoplik, T Thienpont, H Warsaw Univ Fac Phys Informat Opt Grp PL-02093 Warsaw Poland

ISBN: (纸本)081945494X

Fast parallel processing of gray-scale images and exact hard-clip thresholding are two important functionalities necessary in optoelectronic implementations of structural processors. The parallel nature of processing stems from optical implementation of local operations with arrays of active smart pixels. We have demonstrated a morphological image processor composed of arrays of bistable optoelectronic transceivers which are connected in differential pairs and work as comparators. The use of differential pairs of optical thyristors fabricated in GaAs technology allows to realize a dual rail architecture for this photonic morphological image processor. The processor consists of a thresholding module and a binary morphological processing module. The thresholding module decomposes gray level images into series of binary slices. In the binary morphological processing module operations are performed within a neighborhood defined by a structuring element implemented as a diffractive fan-out element. In the prototype set-up we demonstrate median filtering, dilation and erosion operations performed for an image of 8x8 pixels and threshold decomposition of 6 gray level images. In principle all rank order as well as morphological filters can be optically calculated in the set-up. Additional functionality of the processor is achieved with use of the electronic layer with digital cellular processors. The electronic layer, designed as an array of simple digital processors, realizes a set of operations on binary images using 4 bit programmable weights. Simulation results for 0.8 mum CMOS technology are presented. We discuss the limitations of the photonic morphological image processing with respect to bandwidth, parallelism and architecture of the processor.

关键词： local image processing smart pixels mathematical morphology photonic processors threshold decomposition

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Planar integrated free-space optics for optical interconnects and fan-out/in operations

Planar integrated free-space optics for optical interconnect...

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conference on photonic devices and algorithms for computing VI

作者： Jarczynski, M Jahns, R Univ Hagen Dept Elect Engn Opt Informat Technol ONT D-58084 Hagen Germany

ISBN: (纸本)081945494X

The advantages of optical interconnections, like low latency and large bandwidth, are currently becoming more important for on-board or multi-board systems. Clock distribution and data transfer with high channel density and high frequency over areas in order of several centimeters up to a few meters are of interest, e.g., in multi-processor systems. As an approach to solve the challenges of interconnections and fanning we investigate planar integrated free-space optical systems (PIFSO). In the "High-speed Opto-eLectronic Memory System" project (short: HOLMS), supported by the European Commission, a multi-processor system with optical processor memory interconnection is being demonstrated. The system combines different optics technologies. The PIFSO technology is used as the interface between opto-electronic components and optical fibers and/or PCB-embedded waveguides. The tasks of this interface are to realize the pitch transfer, e.g. from the waveguide array to the opto-electronic device array, fan-in and fan-out. To realize the different aspects of these tasks, suitable micro-optical imaging techniques and fan-out approaches are considered. To handle the large numerical aperture of the optical multimode field emerging from the VCSEL-diodes and the waveguides (up to around 0.2), the concept of pupil division is being investigated for the fan-out operation. Practical aspects such as footprint and tolerances are also considered. The feasibility of implementation of the PIFSO interconnect will be shown by means of simulations and experimental demonstration.

关键词： free-space optics micro-optics optical interconnections optical design opto-electronic devices optical computing

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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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Proceedings of SPIE - photonic devices and algorithms for computing V

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

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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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