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Nonlinear harmonic response in microwave and photonic devices, and waveguides

Nonlinear harmonic response in microwave and photonic device...

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12th World Multi-Conference on Systemics, Cybernetics and Informatics, WMSCI 2008, Jointly with the 14th International Conference on Information Systems Analysis and Synthesis, ISAS 2008

作者： El-Badawy, El-Sayed A. EI-Halafawy, Farag Z. Mohamed, Abd-El-Naser A. Eid, Mahmoud M.A. Alexandria 21311 Egypt Elect. Eng. Dept F. of Eng. Alexandria Univ. Alexandria 21544 Egypt Department of Electronic and Electrical Communication Engineering Faculty of Electronics Engineering Menoufia University Menouf 32951 Egypt

ISBN: (纸本)1934272337

In the present paper, we have analyzed nonlinear harmonic response in microwave, photonic devices, and waveguides, applications. Based on Frobenius power series expansions, a special software has been cast and applied with very small truncation error (less than 10-8). Four basic sets of nonlinear harmonic response systems have been processed: i) New algorithms for computing twelve Jacobian elliptic functions are built on the basis of transformation of Jacobian elliptic integrals to nonlinear differential equations of second order, where each function has its generating recurrence formula., ii) Self-trapping (paraxial propagation) in W-shaped refractive index fibers are parametrically investigated, iii) Implementation of the Frobenius method for the numerical solution of initial value problems involving second order nonlinear differential equations with or without arbitrary forced functions under the forms: (Equation presented) are discussed, where α, β, and γ are physical parameters;both m and n are positive solid integers, and f(t) is an arbitrary exciting function, and finally iv) waveguides and multiplexers. A novel software program has been designed and processed to handle the above problems.

关键词： Initial value problems

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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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Detection of off-normal images for NIF automatic alignment

Detection of off-normal images for NIF automatic alignment

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

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

引用

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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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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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...

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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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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