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检索条件"任意字段=Conference on Current Developments in Optical Design and Engineering V"

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JWST fine guidance sensor - guiding performance analysis

JWST fine guidance sensor - guiding performance analysis

引用

conference on Space Telescopes and Instrumentation 2008 - optical, Infrared and Millimeter

作者： Rowlands, N. vila, M. B. Evans, C. Aldridge, D. Desaulniers, D. -L. Hutchings, J. B. Dupuis, J. COM DEV Ltd 100 303 Terry Fox Dr Ottawa ON K2K 3J1 Canada Herzberg Inst Astrophys Victoria BC V9E 2E7 Canada Canadian Space Agcy St Hubert PQ J3Y 8Y9 Canada

ISBN: (纸本)9780819472205

The engineering Test Unit (ETU) of the Fine Guidance Sensor (FGS) for the James Webb Space Telescope (JWST) is currently in fabrication. Extensive modeling of the key FGS-Guider performance parameters has been used throughout the design process and continues to be used to evaluate the expected performance of the as-built instrument. A key parameter of interest is the expected Noise Equivalent Angle (NEA) provided by the FGS. The NEA will, in part, determine the ultimate image quality of the JWST Observatory. In this paper we use updated estimates of the End-of-life impact of contamination to present the current expected NEA performance of the FGS flight model. As component test data becomes available this data will be used as input to the FGS NEA performance model to assess the expected performance of the instrument.

关键词： James Webb Space Telescope Fine Guidance Sensor star tracker infrared instrumentation

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design and modeling of a vertical-cavity surface-emitting laser (vCSEL)

Design and modeling of a vertical-cavity surface-emitting la...

引用

IEEE International conference on Semiconductor Electronics (ICSE)

作者： Kumarajah Kandiah P. Susthitha Menon Sahbudin Shaari Burhanuddin Yeop Majlis Department of Electrical Electronics and System Engineering Faculty of Engineering Malaysia Institute of Micro Engineering and Nanoelectronics (IMEN) Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

In this paper, we attempt to design, simulate and characterize an InGaAs-based vertical-cavity surface-emitting laser (vCSEL) employing InGaAsP multi-quantum wells sandwiched between GaAs/AlGaAs and GaAs/AlAs distributed Bragg reflectors using an industrial-based numerical simulator. We were able to obtain a working model at an optical wavelength of 1.55 mum. This paper provides key results of the device characteristics including the DC v-I and the light power versus electrical current. Effect of DBR mirror stack quantities were also experimented with and the results are reported here.

关键词： vertical cavity surface emitting lasers optical design Laser modes Surface emitting lasers Distributed Bragg reflectors Equations Charge carrier processes Gallium arsenide optical surface waves design engineering

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A 43-GHZ static frequency divider in 0.13μM standard CMOS

A 43-GHZ static frequency divider in 0.13μM standard CMOS

引用

Canadian conference on Electrical and Computer engineering (CCECE)

作者： Bangli Liang Dianyong Chen Bo Wang Dezhong Cheng Tad Kwasniewski Department of Electronics Carleton University Ottawa ONT Canada

In this paper, a low supply static 2:1 frequency divider based on 0.13 mum CMOS is presented. It is designed for 40-Gb/s optical communication systems. current-mode logic (CML) is adopted because of the higher speed compared to static CMOS and the robustness against common-mode disturbances. This frequency divider is designed with output buffer to drive the external 50 Omega loads. On-chip shunt peaking (SP) inductors and split-resistor (SR) loads are used to boost the bandwidth. The frequency divider uses a single 1.2-v supply voltage and consumes a total current of 32 mA. And the chip area is only 0.63 mm 2 with bonding pads.

关键词： Frequency conversion optical frequency conversion optical design optical fiber communication CMOS logic circuits Robustness optical buffering Shunt (electrical) Inductors Strontium

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optical receiver with voltage-controlled transimpedance in BiCMOS technology with a gain bandwidth product of 126 TΩHz

Optical receiver with voltage-controlled transimpedance in B...

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International conference on Microelectronics, MIEL

作者： Niksa Tadic Artur Marchlewski Horst Zimmermann Faculty of Electrical Engineering and Information Technology Institute of Electrical Measurements and Circuit Design University of Technology Vienna Vienna Austria

This paper describes an optical receiver with integrated PIN photodiode and voltage-controlled resistor-based transimpedance in 0.6 mum BiCMOS technology. Both current conveyor and voltage amplifier topology are used. Sensitivity range is increased by using a variable-gain voltage amplifier. Frequency bandwidth enhancement is enabled by applying a fixed-gain voltage amplifier and a current biasing of the current conveyor. A linearity error smaller than 2.8%, a sensitivity range of 541 (54.7 dB), an offset voltage less than 13.7 mv, a power consumption less than 4.3 mW, a frequency bandwidth up to 311 MHz, a slew-rate up to 386 v/mus, and a transimpedance bandwidth product up to 126 TOmegaHz are achieved.

关键词： optical receivers voltage BiCMOS integrated circuits Bandwidth optical amplifiers Frequency PIN photodiodes Topology Linearity Energy consumption

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Programmable Logic Gates for optical Processing

Programmable Logic Gates for Optical Processing

引用

International conference on Information Technology: New Generations (ITNG)

作者： v. Kochergin Z. Shi R. Ostroumov A. Kroetch S. Buswell S. Evoy R. Heflin Luna Innovations Inc.orporated Roanoke VA USA Nanodevices and Sensors National Institute of Nanotechnology Edmonton AB Canada Electrical & Computer Engineering University of Alberta Canada Department of Physics Virginia Polytechnic Institute and State University Blacksburg VA USA

We present the results of joint development effort between Luna Innovations, University of Alberta and virginia Tech targeting the development of ultradense photonic integration platform based on self assembled electro-optical polymers and nanoimprinting approach. Modeling and numerical simulations are used to design the optimized integrated optical structures and to identify performance and integration limits of our concept. Initial experimental results are provided to illustrate the current progress of the team. Discussion of possibility of achieving even higher photonic integration with plasmonic structures is illustrated with results of modeling and simulations.

关键词： Logic gates Programmable logic arrays Programmable logic devices optical polymers Technological innovation Self-assembly Numerical models Numerical simulation optical design design optimization

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Alternating current bias-assisted photoenhanced oxidation of n-GaN in dionized water

Alternating current bias-assisted photoenhanced oxidation of...

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conference on Optoelectronic and Microelectronic Materials and Devices

作者： T. H. Hsueh W. C. Lai C. Y. Yeh J. K. Sheu L. C. Peng K. H. Chang S. E. Wu C. P. Liu Baptiste Gault Simon P. Ringer Institute of Electro-Optical Science and Engineering National Cheng Kung University Tainan Taiwan National Cheng Kung University Tainan TW Department of Materials Science and Engineering National Cheng Kung University Tainan Taiwan University of Sydney Australia

Patterned oxidation of n-GaN in water at room temperature is achieved by using an imprint technique and an alternating current (ac) bias-assisted photoelectrochemical process. Mold is fabricated by a double-side polished sapphire coated with indium tin oxide thin film to be an electrode for electric conduction and allow the high transparency for ultraviolet light. The growth rate of gallium oxide-based material of around 12 nm/min could be achieved when an ac bias of 3 v with a duty cycle of 90% was applied to the system. The film is determined by high-resolution transmission electron microscopy and selected area electron diffraction pattern.

关键词： Oxidation optical films Gallium nitride Indium tin oxide Temperature voltage Etching optical devices Substrates design engineering

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New developments for CMOS SSPMs

New developments for CMOS SSPMs

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Erik B. Johnson Christopher J. Stapels Mickel McClish Sharmistha Mukhopadhyay Paul Linsay Kanai Shah Paul Barton David Wehe Skip Augustine James F. Christian Radiation Monitoring Devices Inc. Watertown MA USA Nuclear Engineering and Radiological Sciences University of Michigan Ann Arbor MI USA Augustine Engineering Encinitas CA USA

A high fill factor SSPM built using a standard CMOS fabrication process can provide an energy resolution of 12.4% at 511 kev using CsI(Tl) crystals. The SSPM was operated at an excess bias of 2 v and 0 °C. The magnitude of the noise terms of the SSPM under these conditions are provided. This is compared to the energy resolution of 11.7% using a PMT at room temperature and the identical crystal. CMOS SSPMs can provide PMT-like energy resolution. Additional developments in back-illuminated and position-sensitive SSPMs devices are provided. A back-illuminated device has the promise of a low-noise, high fill-factor design, and the initial results of the quantum efficiency of back-illuminated, thinned devices, fabricated with an existing SSPM design, are provided. For position-sensitive SSPMs, an image of a 3 × 3 CsI array has been made with an SSPM based on a resistive-network configuration to provide position information has been made with minimal distortions.

关键词： Semiconductor device noise Photodiodes Telephony CMOS process Energy resolution optical noise Solid scintillation detectors Fabrication Resistors Photomultipliers

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Parallel electron beam micro-column with self-aligned carbon nanotube emitters

Parallel electron beam micro-column with self-aligned carbon...

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IEEE International conference on Micro Electro Mechanical Systems

作者： C. H. Tsai J. Y. Ho T. Ono M. Esashi Graduate school of engineering University of Tohoku Sendai Japan

In this paper, we have proposed, fabricated and characterized a parallel electron beam micro-column with single-stranded carbon nanotube (CNT) filed emitters. The integrated micro-column consists of a self-aligned CNT field emitter array (FEA), and a multi-layered electrostatic Si focusing lens array. In our design, the emitters, gate and electrostatic lens array are electrically isolated, and each source can be controlled individually. Electron emission performance of the fabricated CNT/Si emitter was characterized. The best turn-on fields, defined as the field required to generate an emission current of 1 nA, were approximately 6 v. When applying a gate voltage of 100 v, a 110 nA anode current is measured. It is seen that CNT/Si emitter showed low threshold voltage; however, the emission current fluctuation was high during high voltage operation.

关键词： Electron beams Carbon nanotubes Field emitter arrays Electrostatics Lenses Threshold voltage optical design Electron emission Anodes current measurement

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Analysis and design of the High-power Laser Diode Drive circuit Based on MAX797

Analysis and Design of the High-power Laser Diode Drive circ...

引用

2008 International conference on optical Instruments and Technology

作者： Manli LI,Huiying XU~* Department of Electronic engineering,Room 508,Research Building 2,Haiyun Campus,Xiamen University,Xiamen,P.R.China,361005

According to the principle of the laser diode(LD)power supply,this paper uses the chip-MAX797 as a stabilized drivencurrent source to design the *** the output current of the source can reach 4 A,its output voltage can be adjustable between 2.5v and *** efficiency of the drive circuit is up to 96%,and the shutdown current is only 1μ*** make the necessary analysis about the design of the *** whole circuit diagram is made up of three parts which there are an invariable driven-current source,a programmable soft-start circuit and a protection circuit of the over current and the restrained *** adapter supplies the input voltage which is between 4.5v and 30vAnd it adds a resistance to limit the current of the LD at *** theory of this circuit's design is simple,and the function is as much as the conventional,but its size is smaller than the conventional driven-current *** summarize the advantages and disadvantages of the soft-start circuit between this paper and the traditional,and corresponding to analysis of the components selecting,it used the preferred components in the design of the ***,there is a summary and expectation in high-power laser diode power supply design in the future.

关键词： MAX797 high-power LD drive circuit soft-start over current protection circuit

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design of an integrated sensor for noninvasive optical mammography based on frequency-domain NIR spectroscopy

Design of an integrated sensor for noninvasive optical mammo...

引用

IEEE Biomedical Circuits and Systems (BIOCAS)

作者： Ruida Yun valencia M. Joyner Department of Electrical & Computer Engineering Tufts University Medford MA USA

Time-resolved techniques for optical spectroscopy are emerging as a promising diagnostic tool for mammography providing richer information content of optical images and improved tumor detectability. This paper presents the design of an integrated optical sensor for phase and amplitude detection of RF-modulated optical signals up to 110 MHz in the near-infrared (NIR) region (650-850 nm) for use in frequency-domain instruments that measure both amplitude and phase changes in photon migration between source and detector. The sensor consists of an NIR-sensitive photodetector monolithically integrated with front-end analog amplifier and signal processing circuitry for amplitude and phase detection in an unmodified CMOS process. The differential transimpedance amplifier (TIA) achieves a transimpedance-bandwidth product of 28 THzOmega and input-referred current noise of 1.92 pA/radicHz at 110 MHz. The amplitude detector exhibits 49.2 mv/muA resolution with 0.5% linearity and 26 dB dynamic range. The proposed phase detector can detect 360 degree phase difference with phase resolution of 5 mv/degree. The sensor is implemented in a 0.18 mum CMOS technology and consumes 22.5 mW from a 1.8 v supply voltage. The integrated sensor presented is envisaged as a building block towards a low-power, low-cost optical sensor array system for concurrent measurement of multiple tissue sites, thus improving spatial resolution.

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