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Network processor design: issues and challenges

Network processor design: issues and challenges

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IEEE Pacific Rim conference on Communications, Computers and Signal Processing

作者： F. Khunjush M.W. El-Kharashi K.F. Li N.J. Dimopoulos Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada

Since the deployment of the ARPANET in the 60s and the local area networks, Intranets, and the Internet in the 70s and 80s, research investigation and commercial product developments have focused on network infrastructures such as fiber trunks, routers, and switches, as well as OSI layers 2 and 3 protocol equipment. Recently, in response to the increasing complexity of the communication protocols and exploding demand for functionalities in network active components, chip manufacturers and researchers recently shifted their effort to the design and implementation of NPUs (network processing units). This work investigates the characteristics and properties of network applications and protocols. Understanding the requirements of these applications and protocols enables the formulation of the overall objectives and specifications in the design of NPUs. Some of the existing commercial products are surveyed and their functional objectives and design approaches are examined. We conclude with the current status of NPU development. Immediate challenges in design and implementation of NPUs, with respect to the rapid network expansion and increasing traffic demand, are also discussed.

关键词： Process design Protocols ARPANET Local area networks IP networks Product development optical fiber communication optical fiber devices optical fiber LAN Switches

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New aberration properties of two-mirror Cassegrain lenses

New aberration properties of two-mirror Cassegrain lenses

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conference on current developments in Lens design and optical engineering III

作者： Bezdidko, SN Sci Ctr House Opt Moscow Russia

Analysis of aberration performance of two-mirror Cassegrain lens allowed revealing an interesting relationship between them and the central obscuration coefficient epsilon and the distance delta of the focal plane fro... 详细信息

ISBN: (纸本)0819445347

关键词： lens design aberration performance two-mirror Cassegrain lens

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optical design of a reflectance/Raman confocal microspectrometer

Optical design of a reflectance/Raman confocal microspectrom...

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conference on current developments in Lens design and optical engineering III

作者： Mouroulis, P CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819445347

A miniaturized instrument for systematic planetary mineralogy is presented, and the optical design of the component parts is discussed. The instrument combines the following capabilities: wide field color imaging, confocal imaging at two different resolution/range levels, reflectance spectroscopy in the 400-2500 nm region with a resolution of 10 nm, and Raman spectroscopy over 4000 cm(-1) with an average resolution of 3.3 cm(-1). The instrument can also serve as an expandable platform for adding fluorescence spectroscopy, or for examining samples from a distance of several meters while using the same spectrometer.

关键词： optical design confocal microscopy planetary mineralogy reflectance spectroscopy Raman spectroscopy

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designing Aspherics with discrete representation

Designing Aspherics with discrete representation

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conference on current developments in Lens design and optical engineering III

作者： Wei, N Gong, MI Yan, P Zhang, HT Tsing Hua Univ Dept Precis Instrument Digital Photon Lab Beijing 100084 Peoples R China

ISBN: (纸本)0819445347

We have developed a new method other than traditional technique based on ray tracing and optimization algorithm to design arbitrary aspherics. Analytic definition of the aspheric surfaces is done away with and numerical solution of nonlinear difference equations called Aspheric Intrinsic Equations (AIE) is implemented instead. Simulation results compared with traditional optical design software are presented, which prove that this new method is more effective and reliable in designing aspheric surfaces.

关键词： aspherics discrete representation optical disk lens design

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Proceedings of SPIE: current developments in Lens design and optical engineering III

Proceedings of SPIE: Current Developments in Lens Design and...

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current developments in Lens design and optical engineering III

This Volume 4767 of the conference proceedings contains 19 papers. Topics discussed include optical system, optical sensors, optical materials, optical design and optical devices.

关键词： optical engineering

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New infrared optical systems using diffractive optics

New infrared optical systems using diffractive optics

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conference on current developments in Lens design and optical engineering III

作者： Bigwood, C Thales Opt Ltd St Asaph LL17 0LL Denbigh Wales

ISBN: (纸本)0819445347

A method for computing the polychromatic MTF of hybrid refractive - diffractive elements is described taking into consideration the effects of not only the primary diffraction order but also the effects of additional parasitic diffraction orders. The results of this approach are compared with the more conventional single order calculation and with actual measured performance. For certain markets and applications the cost of infrared lenses are critical in order to achieve customer expectations. Two possible methods of realising this requirement are the use of moulded optics or the use of multiple kinoform optics with no refractive power. Examples of such lenses are given along with discussion of the merits and limitations that each approach entails.

关键词： optical design infrared diffractive optics

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design of a dual field-of-view optical system for infra-red focal-plane arrays

Design of a dual field-of-view optical system for infra-red ...

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conference on current developments in Lens design and optical engineering III

作者： Akram, MN Royal Inst Technol Dept Microelect & Informat Technol SE-16440 Stockholm Sweden

ISBN: (纸本)0819445347

In this paper, the design of a dual field-of-view optical system for 3-5 mum infra-red focal-plane arrays is described. Preliminary calculations are done to determine the first-order parameters of the narrow and the wide-field modes. To achieve a switchable dual field-of-view system, two different optical configurations, one based on the axial motion of a lens group and the other based on a rotate-in motion of two separated lens groups, are studied and compared. Diffractive and conic surfaces are used to control the color and the monochromatic aberrations with less number of total lenses used. Paraxial and real-ray modelling of the Narcissus effect is described. It is shown that the rotate-in scheme achieves better optical performance in both the narrow and the wide-field modes. The axial-motion scheme suffers from poor lateral color in the wide-angle mode. The final optical designs along with their aberrations curves and MTF plots are presented showing excellent performance.

关键词： lens design infrared optics diffractive optics dual field-of-view focal-plane-arrays (FPA)

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design considerations for a compact infrared airborne imager to meet alignment and assembly requirements

Design considerations for a compact infrared airborne imager...

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conference on current developments in Lens design and optical engineering III

作者： Spencer, HM DRS Sensor Syst Torrance CA USA

ISBN: (纸本)0819445347

Helicopter mounted optical systems require compact packaging, good image performance (approaching the diffraction-limit), and must survive and operate in a rugged shock and thermal environment. The always-present requirement for low weight in an airborne sensor is paramount when considering the optical configuration. In addition, the usual list of optical requirements which must be satisfied within narrow tolerances, including field-of-view, vignetting, boresight, stray light rejection, and transmittance drive the optical design. It must be determined early in the engineering process which internal optical alignment adjustment provisions must be included, which may be included, and which will have to be omitted, since adding alignment features often conflicts with the requirement for optical component stability during operation and of course adds weight. When the system is to be modular and mates with another optical system, a telescope designed by different contractor in this case, additional alignment requirements between the two systems must be specified and agreed upon. Final delivered cost is certainly critical and "touch labor" assembly time must be determined and controlled. A clear plan for the alignment and assembly steps must be devised before the optical design can even begin to ensure that an arrangement of optical components amenable to adjustment is reached. The optical specification document should be written contemporaneously with the alignment plan to insure compatibility. The optics decisions that led to the success of this project are described and the final optical design is presented. A description of some unique pupil alignment adjustments, never performed by us in the infrared, is described.

关键词： Imaging systems Telescopes Sensors optical alignment Scanners Infrared radiation Objectives optical design Tolerancing Infrared imaging

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Novel CNC polishing process for control of form and texture on aspheric surfaces

Novel CNC polishing process for control of form and texture ...

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conference on current developments in Lens design and optical engineering III

作者： Walker, DD Beaucamp, ATH Brooks, D Freeman, R King, A McCavana, G Morten, R Riley, D Simms, J UCL Dept Phys & Astron Opt Sci Lab London WC1E 6BT England

ISBN: (纸本)0819445347

We first consider the potential impact of a technology that could deliver polished, accurate aspheric surfaces in a routine and automated manner. We then summarise the technical challenge, and present an appraisal of the performance of the novel 'Precessions' process, which is a major advance in this direction. We outline the design concepts behind the productionized CNC polishing machines which executes the process, and then describe the progress developing strategies to preserve form when polishing ground surfaces, and to correct form on both pre-ground and polished surfaces. Particular consideration is given to resolving the inherent difficulties of control of centres on rotationally-symmetric parts. We then report on experimental results achieved with the machines. Finally, we present our programme to extend the control-algorithms to handle fully free-form surfaces, and draw conclusions about the effectiveness and generality of the 'Precessions' technique.

关键词： Polishing Surface finishing Aspheric lenses Process control Raster graphics Spherical lenses Mirrors Astronomy optical instrument design Polishing equipment

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Reflectivity of the Al-Cr stray-light-absorptive coating

Reflectivity of the Al-Cr stray-light-absorptive coating

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conference on current developments in Lens design and optical engineering III

作者： Anisimov, VP Anisimova, IA Moldosanov, KA Skrynnikov, AM Kashirin, VA Kyrgyz Acad Sci Inst Chem & Chem Technol Bishkek 720071 Kyrgyzstan

ISBN: (纸本)0819445347

Results of measurements of the total hemispherical reflectance (THR), emissivity c and solar radiation absorption factor alpha(s) of the Al-Cr stray-light-absorptive coating are reported. This coating was designed to reduce the stray sunlight background in aerospace instruments. Generally, this problem arises when a density of instruments installed on the satellite is high and it is difficult to avoid getting to instrument the light reflected by neighboring devices. The THR, epsilon and alpha(s) measurement results are presented for 10 wavelengths within a range from. 400 to 927 nm, and also at 121.6 nm, the most intensive line of the solar UV spectrum, which is able to create considerable contribution to the detector noise in space devices. The goal of present experiments was to test an idea that by providing the electron scattering in the coating skin layer, it is possible to reduce the THR. To have the samples with increased electron scattering intensity, the samples of the Al-Cr coating were manufactured. As in the Al-Cr alloy the d-band of chromium electrons is located in the vicinity of the Fermi energy of Al, in this alloy a considerable electron scattering takes place. Therefore, within the skin layer of such coating, the electrons excited by photons transfer their energies and momenta to the lattice and other electrons instead of releasing the secondary photons. Hence, the reflectivity of the Al-Cr coating might be reduced. The prepared samples and performed experiments confirmed this assumption. According to the measurement results, the chromium appears to be an acceptable additional admixture to provide a further reflectivity reduction in the previously studied promising Al-N coating.

关键词： stray light optical engineering stray-light-absorptive coating low reflectivity material

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