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检索条件"任意字段=Conference on Multifrequency Electronic/Photonic Devices and Systems for Dual-Use Applications"

共 83 条记录，以下是61-70 订阅

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Terahertz detection using double quantum well devices

Terahertz detection using double quantum well devices

引用

conference on multifrequency electronic/photonic devices and systems for dual-use applications

作者： Khodier, MM Christodoulou, CG Simmons, JA Univ New Mexico EECE Dept Albuquerque NM 87131 USA

ISBN: (纸本)0819442046

This paper discusses the principle of operation of an electrically tunable THz detector, working around 2.54 THz, integrated with a bowtie antenna. The detection is based on the idea of photon-assisted tunnelling (PAT) in a double quantum well (DQW) device. The bowtie antenna is used to collect the THz radiation and feed it to the detector for processing. The Bowtie antenna geometry is integrated with the DQW device to achieve broadband characteristic, easy design, and compatibility with the detector fabrication process. The principle of operation of the detector is introduced first. Then, results of different bowtie antenna layouts are presented and discussed.

关键词： THz detector photon-assisted tunnelling DQW bowtie antenna

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Multi-tone photonic oscillator

Multi-tone photonic oscillator

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conference on multifrequency electronic/photonic devices and systems for dual-use applications

作者： Sayyah, K Yap, D HRL Labs LLC Malibu CA 90265 USA

ISBN: (纸本)0819442046

A photonic oscillator that can generate multi-tone oscillations in both the RF and optical domains is demonstrated. The oscillator consists of a simple closed optoelectronic loop comprising a CW laser source, an optical modulator, a photodetector, a low noise electrical amplifier, an electrical bandpass filter and single or multiple optical delay elements. Multi-tone oscillations with independent control of tone spacing and phase noise is demonstrated using two optical fiber delay lines as optical delay elements. The phase noise of the oscillator is systematically measured as a function of its parameters such as the photodetector current, the amplifier gain and oscillation frequency. Phase noise values better than -125 dBc/Hz at 100 kHz offset frequency are measured at various combinations of the above parameters. Multi-tone photonic oscillators using Mach-Zender or electroabsorption modulators are theoretically analyzed and experimentally demonstrated with their relative merits compared.

关键词： photonic oscillator optoelectronic oscillator multi-tone oscillation phase noise optical delay optical modulator tone spacing open-loop gain spectral purity

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Cramer-Rao bound analysis of target characterization accuracy limits for imaging systems

Cramer-Rao bound analysis of target characterization accurac...

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conference on multifrequency electronic/photonic devices and systems for dual-use applications

作者： Gerwe, DR Idell, PS Vaughn, JA Boeing Lasers & Electroopt Syst Canoga Pk CA 91309 USA

ISBN: (纸本)0819442046

A methodology for analyzing an imaging sensor's ability to assess target properties is developed. By applying Cramer-Rao covariance analysis to a statistical model relating the sensor measurements to the target, a bound on the accuracy with which target properties can be estimated can be calculated. Such calculations are important in understanding how a sensor's design effects its performance for a given assessment task, and in performing feasibility studies or trade studies between sensor designs and sensing modalities. A novel numerical model relating a sensor's measurements to a target's three-dimensional geometry is developed in order to overcome difficulties in accurately performing the required numerical computations. An example use of the approach is presented in which the influence of viewing perspective on orientation accuracy limits is analyzed. The example is also used to examine the potential for improving the accuracy bound by fusing multi-perspective data.

关键词： orientation estimation target characterization robotic vision image analysis covariance-analysis

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Simultaneous suppression of laser relative intensity noise, 2nd and 3rd order distortions using a balanced electroabsorption modulator

Simultaneous suppression of laser relative intensity noise, ...

引用

conference on multifrequency electronic/photonic devices and systems for dual-use applications

作者： Mathai, S Cappelluti, F Jung, T Novak, D Waterhouse, R Sivco, D Cho, AY Ghione, G Wu, MC Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90024 USA

ISBN: (纸本)0819442046

Balanced electroabsorption modulators (B-EAM) are an attractive alternative to the cross-coupled Mach-Zehnder modulator. The B-EAM enables bias independent suppression of even-order distortions, relative intensity noise (RIN), and common amplified spontaneous emission noise. By biasing the B-EAM at the 3rd order null, a 5th order distortion limited spurious free dynamic range can be achieved. We report on the experimental demonstration of the simultaneous suppression of laser RIN, 2nd and 3rd order distortions using a 300 gm long B-EAM.

关键词： microwave photonics electroabsorption modulator balanced photonic link distortion suppression laser relative intensity noise suppression

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photonic mm-wave generation using a double passband fiber Bragg grating filter

Photonic mm-wave generation using a double passband fiber Br...

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conference on multifrequency electronic/photonic devices and systems for dual-use applications

作者： Menders, J Diamond, C Miles, E IPITEK Carlsbad CA 92008 USA

ISBN: (纸本)0819442046

We report a simplified version of a nun-wave generator employing the sideband filtering technique which uses a single optical sideband filter. Instead of using a Mach-Zehnder-like fiber network to select a pair of sidebands, we employ a single Fabry-Perot fiber Bragg grating with a pair of passbands separated by the nun-wave frequency. Using a single filter, eliminated the need for polarization control and pathlength matching that was required by the former interferometer-like arrangement. We describe a 30 GHz generator design and present its nun-wave signal spectrum showing an instrument limited linewidth of similar to20 Hz. The generation of such an extremely narrow signal spectrum from a laser with a I MHz linewidth demonstrates the remarkable laser frequency noise cancellation property of the sideband filtering technique.

关键词： mm-wave generator RF photonics fiber Bragg grating Fabry-Perot filter optical sideband generation phase modulation photonically controlled phased array

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photonics applications in high capacity data link terminals

Photonics applications in high capacity data link terminals

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conference on multifrequency electronic/photonic devices and systems for dual-use applications

作者： Shi, Z Foshee, JJ Radiant Photon Inc Austin TX 78758 USA

ISBN: (纸本)0819442046

Radio systems and, in particular, RF data link systems are evolving toward progressively more bandwidth and higher data rates. For many military RF data link applications the data transfer requirements exceed one Gigabit per second. Airborne collectors need to transfer sensor information and other large data files to ground locations and other airborne terminals, including the real time transfer of files. It is a challenge to the system designer to provide a system design, which meets the RF link budget requirements for a one Gigabit per second data link;and there is a corresponding challenge in the development of the terminal architecture and hardware. The utilization of photonic circuitry and devices as a part of the terminal design offers the designer some alternatives to the conventional RF hardware design within the radio. Areas of consideration for the implementation of photonic technology include Gigabit per second baseband data interfaces with fiber along with the associated clocking rates and extending these Gigabit data rates into the radio for optical processing technology;optical interconnections within the individual circuit boards in the radio;and optical backplanes to allow the transfer of not only the Gigabit per second data rates and high speed clocks but other RF signals within the radio. True time delay using photonics in phased array antennas has been demonstrated and is an alternative to the conventional phase shifter designs used in phased array antennas, and remoting of phased array antennas from the terminal electronics in the Ku and Ka frequency bands using fiber optics as the carrier to minimize the RF losses, negate the use of the conventional waveguides, and allow the terminal equipment to be located with other electronic equipment in the aircraft suitable for controlled environment, ready access, and maintenance. The various photonics design alternatives will be discussed including specific photonic design approaches. Packaging, performa

关键词： communication system photonic RF optical interconnect phased array antenna remoting optical process

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photonic phase-tuning circuit for controlling the delay-time of passively mode-locked Ti:sapphire laser

Photonic phase-tuning circuit for controlling the delay-time...

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conference on multifrequency electronic/photonic devices and systems for dual-use applications

作者： Lin, GR Chang, YC Liu, TA Pan, CL Tatung Univ Inst Electroopt Engn Taipei 10451 Taiwan

ISBN: (纸本)0819442046

A DC-voltage controlled optoelectronic phase shifter (OEPS) integrated with a PZT-controlled active stabilizer is proposed for both the reduction in timing jitter and the tuning in delay-time of optical pulses generated from argon-ion-laser-pumped, passively mode-locked femtosecond Ti:sapphire laser with intracavity saturable Bragg reflector (SBR). The rms timing jitter (100-500 Hz) of the Ti:sapphire/SBR laser is significantly suppressed down to 290 fs;with uncorrelated single-sided-band phase noise of less than -120 dBc/Hz at offset frequency of 5 KHz. The pulsewidth, the repetition rate, and the single-sided-band phase noise of the laser are found to keep invariant during the delay-time timing process. The maximum phase-tuning range and tuning gain of the OEPS is approximate to11.3 ns and 2.3 ns/volt.

关键词： electro-optic sampling optoelectronic delay-time controller phase-shifter pulsed laser

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Wideband photonic A/D conversion using 2-D spatial oversampling and spectral noise shaping

Wideband photonic A/D conversion using 2-D spatial oversampl...

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conference on multifrequency electronic/photonic devices and systems for dual-use applications

作者： Shoop, BL Das, PK US Mil Acad Photon Res Ctr West Point NY 10996 USA

ISBN: (纸本)0819442046

The analog-to-digital (A/D) interface is generally considered to be the most critical part of any signal acquisition and processing system. Because of the difficulty in achieving high-resolution and high-speed A/D converters, this A/D interface has been and continues to be a barrier to the realization of high-speed, high-throughput system. Recently, there has been a renewed interest in new and innovative approaches to A/D conversion, with a significant emphasis on photonic techniques. Interleaving is a common approach applied to high-speed photonic A/D conversion which reduces the wide-bandwidth input signal to one which can be converted using conventional high-speed A/D converters. The high-speed sampled input is interleaved to N individual channels with each channel operating at 1/N of the sampling rate. These channelization techniques are known to suffer from performance degradations due to channel-to-channel mismatch. Within the electronic A/D converter community, temporal oversampling and spectral noise shaping have become common practice in high-fidelity audio applications. Here, a low-resolution quantizer is embedded in a feedback architecture in an effort to reduce the quantization noise through spectral noise shaping. A large error associated with a single sample is diffused over many subsequent samples and then linear filtering techniques are applied to remove the spectrally-shaped noise thereby improving the overall SNR of the converter. The approach to wideband photonic A/D conversion described here leverages the 2-D nature of an optical architecture to extend the concept of spectral noise shaping to include 2-D spatial noise shaping. The proposed approach uses a mode-locked laser to generate the optical sampling pulses, an interferometer to modulate the electronic analog signal onto the optical pulses, and a 2-D smart pixel hardware implementation of a distributed error diffusion neural network.

关键词： photonic A/D conversion analog-to-digital conversion error diffusion neural networks

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Wide bandgap materials in thermal management of electronic structures

Wide bandgap materials in thermal management of electronic s...

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International conference on Novel applications of Wide Bandgap Layers

作者： P.J. Gielisse H. Niculescu J. Tremblay S. Achmatowicz M. Jakobowski E. Zwierkowska L. Golonka FAMU FSU College of Engineering Florida State University Tallahassee FL USA Institute of Electronic Materials Technology Warszawa Poland Wroclaw University of Technology Wroclaw Poland

The need for optimized thermal management in microelectronic devices derives from several sources, of which the ever-increasing miniaturization is only one. Power dissipation needs in certain designs are up to 40 W/cm/sup 2/, while 100 W/cm/sup 2/ is said to be required in the not too distant future. New multilayer ceramic integrated circuits (MCIC's) contain many "buried heat sources" in the form of resistors, capacitors, and inductors, the volume of which are increasing as well. Microelectronic packages and circuits and particularly high power microelectronics, require both temperature and temperature gradient control. The first primarily assures that the components are kept below a certain temperature threshold, providing reliability. Keeping the circuit between specific low and high temperature boundaries, primarily effects performance and structural considerations. Where other solutions are not available due to size, thermal load, or other systems considerations, a cold plate-a substrate equipped with liquid flow channels-could be resorted to. In most cases, however, the complexity that cold plates introduce, cannot be tolerated if for no reason other than cost. Heat exchange via a high thermal conductivity substrate connected to an appropriate heat sink must, in most cases, be relied on. Electrically conducting (metallic) substrates have become available but most applications require it to be a dielectric, exemplified by the most widely used "electronic" alumina (Al/sub 2/O/sub 3/, 96%) with an average thermal conductivity value of 20 W/mK. The last five years or so have seen an increase in the use of polycrystalline AlN (k/spl cong/175 W/mK). Its application has also been limited due to cost. Substrates based on yet another (polycrystalline) wide bandgap material, SiC (250 W/mK), are again too costly for most applications and are conductive. Furthermore, SiC occurs in several polymorphic forms and many polytypes i.e., it is hard to obtain phase pure, potentia

关键词： Thermal management of electronics photonic band gap Thermal management Thermal conductivity Microelectronics Circuits Dielectric substrates Silicon carbide Temperature Costs

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Chiral liquid crystals for ferroelectric, electroclinic and antiferroelectric displays and photonic devices

Chiral liquid crystals for ferroelectric, electroclinic and ...

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conference on Liquid Crystal Materials, devices, and Flat Panel Displays

作者： Goodby, JW Toyne, KJ Hird, M Styring, P Lewis, RA Beer, A Dong, CC Glendenning, ME Jones, JC Lymer, KP Slaney, AJ Minter, V Chan, LKM Univ Hull Dept Chem Hull HU6 7RX N Humberside England

ISBN: (纸本)0819435732

Ferroelectric and antiferroelectric liquid crystals have shown great promise for use in large area flat panel displays because of their fast switching and bistable operation. However, the commercialization of FLCDs and AFLCDs using surface stabilized geometries has not materialized for a number of reasons, most notably shock instability, the need to control the cell spacing of the display to between 1 and 2 mu m, and competition from actively addressed nematic displays. Surface stabilized displays are nevertheless finding niche markets in areas such as spatial light modulators, microdisplays, and projection systems. Even though this is the present situation it is clear that FLCs and AFLCs will be used advantageously in the future in active matrix configurations to give LCDs that operate at video-frame rates. Furthermore, there are many emerging uses for such materials in the areas of photonics and sensors eg, novel switching;and wavelength filtering components based on liquid crystal phase modulators and filters. There is also interest in utilizing LC technology in fibre optic networks, telecommunication transmission systems, interconnecting networks in large computers, optical image processors, and optically accessible electronic memory structures. All of these applications require fast switching materials that are stable and non-absorbent to light of various wavelengths.

关键词： liquid crystals LCDs ferroelectrics antiferroelectrics displays gels hosts dopants

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