This program has successfully accomplished its main objective in that large core single-mode Ge-doped and Yb-doped CCC fibers have been developed as a platform for monolithically-integrated building blocks (individual laser channels) of high power beam-combined fiber laser arrays. Robust single-mode performance of CCC fibers with core sizes of up to approximately 60m has been rigorously demonstrated. Various CCC fiber based high power lasers have been also demonstrated, including 600W SBS-free single-frequency linearly-polarized cw fiber MOPA system, mJ pulsed and high-pwer ultrashort-pulse CPA systems. Accurate numerical modeling tools for designing CCC structures have been developed. Fabrication of CCC fibers reached such a degree of maturity that they have become available commercially. Furthermore, this program resulted in a successful demonstration of SBS suppression in acoustic-guidance tailored fibers with up to 13dB SBS threshold increase, which to our knowledge constitutes one of the largest SBS suppression achieved to date. UUIC group also performed an extensive study of SBS gain coefficient magnitude and spectrum in a variety of fiber glass materials.

关键词：电子信息；电子；激光器；纤维技术

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The design of power amplifiers in any semi-conductor process is not a trivia exercise and it is often encountered that the simulated solution is qualitatively different than the results obtained. Phenomena such as oscillation occurring either in-band or out of band and sometimes at subharmonic intervals, continuous spectrum noticed in some frequency bands, often referred to as chaos, and jumps and hysteresis effects can all be encountered and render a design useless. All of these problems might have been identified through a more rigorous approach to stability analysis. Designing for stability is probably the one area of amplifier design that receives the least amount of attention but incurs the most catastrophic of effects if it is not performed properly. Other parameters such as gain, power output, frequency response and even matching may suitable mitigation paths. But the lack of stability in an amplifier has no mitigating path. In addition to of loss of the design completely there are the increased production cycle costs, costs involved with investigating and resolving the problem and the costs involved with schedule slips or delays resulting from it. The Linville or Rollett stability criteria that many microwave engineers follow and rely exclusively on is not sufficient by itself to ensure a stable and robust design. It will be shown that the universal belief that unconditional stability is obtained through an analysis of the scattering matrix S to determine if 1 and (Delta)(sub S) < 1 is only part of the procedure and other tools must be used to validate the criteria. The research shown contributes to the state of the art by developing a more thorough stability design technique for designing amplifiers of any class, whether that be current mode or switch mode, than is currently undertaken with the goal of obtaining first pass design success.

关键词：电子信息；电子；功率放大器；集成

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video rate of real-time imaging in the terahertz frequency range has become possible in the last few years with the advent of compact and high power thz sources.such as quantum cascade (QC) lasers, and the THz- sensitive vanadium oxide based microbolometer focal plane arrays.

关键词：电子信息；电子；激光器；高功率

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The development of a high-brightness semiconductor diode laser/amplifier concept, which utilizes a slab-coupled optical waveguide (SCOW) region to achieve several important advances in performance, has been presented. SCOW devices are capable of single-spatial-mode operation with a single-lobed, large-area, low-aspect-ratio beam that is easily coupled to a single-mode fiber with high-coupling efficiency. The SCOW concept is applicable to a wide variety of semiconductor material systems and wavelengths of interest.

关键词：电子信息；电子；激光器；放大器

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Electrochemical supercapacitors are rechargeable electrochemical energy storage devices similar to batteries, but with different performance characteristics. Supercapacitors can store more power in a smaller volume and often at a lower cost. In contrast to batteries, supercapacitors have incredibly long cycle life (> 1000,000 cycles), and could be charged in less than a second. Their unique characteristics allow them to complement batteries in applications where high power and low weight are essential, including directed-energy weapons, compact pulsed power, mobile power quality devices, and peak power sources for aircraft and electric vehicles. In our project we focus on materials for high energy / high power supercapacitors.

关键词：电子信息；电子；功率；电容器

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The radio frequency (RF) power amplifier (PA) is one of the most critical components in designing transmitters in wireless communication systems, and its efficiency dominates the overall efficiency of the transmitter. On one hand, the PA is most power consuming ; for example, in a cellular phone, the battery life is largely determined by the power efficiency of the PA. On the other hand, it is desirable to have the ability to transmit data at the highest possible rate for a given channel bandwidth, i.e., to have high spectral efficiency [1].

关键词：电子信息；电子；功率放大器；线性化技术

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This chapter describes the READ sense amplifier (SA) of the memory. It discusses the fundamental limitation on the SA performance, especially for the memories in deep sub micron technologies. It covers various calibration based SA design techniques. With the practical implementation details for Multi-sized SA redundancy. And comparison of the various calibration based techniques. Then a charge limited sequential sensing concept is discussed. Finally the design and implementation details of a calibration free SA based on the charge limited sequential sensing is provided.

关键词：电子信息；电子；变异；检测放大器

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The goal of this project was to provide a demonstration of issues related to laminate packaging, and demonstration of a socket system and a connector system using inductively and capacitively coupled AC interconnect. In addition, we were tasked to deliver a test module for a test in near earth orbit on the TacSat-3 spacecraft. The vast majority of the goals of the project were achieved.

关键词：电子信息；电子；交流耦合；低功率

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Experimental results on 60GHz band signal transmission through ECOR (Electromagnetic Coupling of Open-Ring Resonators) are shown. Through sapphire substrate, 60-70GHz band signal are transmitted with 58.9transmission efficiency and 7.4GHz bandwidth. However, the transmission band was shifted about 10GHz higher frequency. The reason is under investigation. ECOR technology is extended to lower frequencies for non-contact power transmission. The technology will benefit to power connectors for equipment modules where the problems caused by humidity and mechanical failure will be eliminated. A new diode structure for RF signal rectification, loss mechanism in rectenna circuits and the effect of wetting to ECOR transmission will be presented.

关键词：电子信息；电子；电磁耦合；环谐振器

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This document describes a repeatable test procedure that attempts to simulate shading situations, as would be experienced by typical residential rooftop photovoltaic (PV) systems. This type of shading test is particularly useful to evaluate the impact of different power conversion setups, including microinverters, DC power optimizers and string inverters, on overall system performance. The performance results are weighted based on annual estimates of shade to predict annual performance improvement. A trial run of the test procedure was conducted with a side by side comparison of a string inverter with a microinverter, both operating on identical 8kW solar arrays. Considering three different shade weighting conditions, the microinverter was found to increase production by 3.7under light shading, 7.8under moderate shading, and 12.3under heavy shading, relative to the reference string inverter case. Detail is provided in this document to allow duplication of the test method at different test installations and for different power electronics devices.

关键词：电子信息；电子；实验平台；模块级

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