Download or read book RF Photonics for Array Processing MURI 3rd Year Summary written by and published by . This book was released on 2001 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers the fourth year of progress of the 1997 MURI on RF Photonics for Antenna Arrays at the University of Colorado, Montana State University, George Mason University, and the University of California Davis. Novel techniques for optical control and processing of the wideband RF and microwave signals encountered in phased array antennas are being developed, guided by research in spatio-temporal adaptive processing algorithms and active quasioptical RF antenna arrays. The primary goal of this research is to develop enabling optical techniques that provide dramatic improvements in antenna array performance over conventional RF, optical, and digital techniques, allowing the efficient processing of large broadband antenna arrays. Coherent modulation and detection is made robust and practical by the use of dynamic holography in photorefractive and optical coherent transient media. This report summarizes the teams management, educational, and outreach activities, as well as technical progress in the 4th year on the constituent projects broadband adaptive optical array processing, spatio-temporal array processing algorithms, coherent-transient true-time delay, photorefractive signal extraction, optical antenna control, and polymer in-line fiber modulators.
Download or read book RF Photonics for Array Processing MURI 5th Year Summary written by and published by . This book was released on 1997 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers the fifth year of progress of the 1997 MURI on RF Photonics for Antenna Arrays at the University of Colorado, Montana State University, George Mason University, and the University of California Davis. Novel techniques for optical control and processing of the wideband RF and microwave signals encountered in phased array antennas have been developed, guided by research in spatio-temporal adaptive processing algorithms and active quasioptical RF antenna arrays. The primary goal of this research is to develop enabling optical techniques that provide dramatic improvements in antenna array performance over conventional RF, optical, and digital techniques, allowing the efficient processing of large broadband antenna arrays. Coherent modulation and detection is made robust and practical by the use of dynamic holography in photorefractive and optical coherent transient media. This report summarizes the teams management, educational, and outreach activities, as well as technical progress in the fifth year on the constituent projects - broadband adaptive optical array processing, spatio-temporal array-processing algorithms, coherent-transient true-time-delay, photoreflactive signal extraction, optical antenna control, and polymer in-line fiber modulators.
Download or read book RF Photonics for Array Processing MURI written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This final report covers 6 years of progress of the 1997 MRI on RF Photonics for Antenna Arrays at the University of Colorado, Montana State University, George Mason University, and the University of California Davis. Novel techniques for optical control and processing of the wideband RF and microwave signals encountered in phased array antennas have been developed, guided by research in spatio-temporal adaptive processing algorithms and active quasi-optical RF antenna arrays. The primary goal of this research is to develop enabling optical techniques that provide dramatic improvements in antenna array performance over conventional RF, optical, and digital techniques, allowing the efficient processing of large broadband antenna arrays. Coherent modulation and detection is made robust and practical by the use of dynamic holography in photorefractive and optical coherent transient media. This report summarizes the teams management, educational, and outreach activities, as well as technical progress summarized in 3 attached PhD thesis on broadband adaptive optical array processing spatio-temporal holographic - processing algorithms, coherent-transient true-time-delay, photorefractive signal extraction, optical antenna control, and polymer in line fiber modulators.
Download or read book 1997 MURI in RF Photonics RF Photonics for Array Processing written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers the third year of progress of the 1997 MURI on RF Photonics for Antenna Arrays at the University of Colorado, Montana State University, George Mason University, and the University of California Davis. Novel techniques for optical control and processing of the wideband RF and microwave signals encountered in phased array antennas are being developed, guided by research in spatio-temporal adaptive processing algorithms and active quasi-optical RF antenna arrays. The primary goal of this research is to develop enabling optical techniques that provide dramatic improvements in antenna array performance over conventional RF, optical, and digital techniques, allowing the efficient processing of large broadband antenna arrays. Coherent modulation and detection is made robust and practical by the use of dynamic holography in photorefractive and optical coherent transient media. This report summarizes the teams management, educational, and outreach activities, as well as the 3rd years technical progress on the constituent projects - broadband adaptive optical array processing, spatio-temporal array-processing algorithms, coherent-transient true-time-delay, photorefractive signal extraction, optical antenna control, and polymer in-line fiber modulators.
Download or read book Applications for Modern RF Photonics written by Preetpaul Singh Devgan and published by Artech House Publishers. This book was released on 2018-01-31 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This unique new resource presents applications of modern RF photonic systems that use RF photonic components for commonly used signal processing systems. This book provides insight into how a variety of systems work together, including RF down conversion, analog to digital conversion, RF oscillators, and frequency identification. A comparison of analog versus digital systems is presented. Readers find in-depth coverage of analog delay lines using RF photonics, various system architectures, and details about RF photonic component performance. Signal processing utilizing RF photonics and the need for down conversion is discussed. The many advancements in analog delay line performance are explained, including those in photodetector, optical fibers, and optical and amplifier modulators. The book highlights the advantages of using oscillators utilizing RF photonics and explores the elements of phase noise, timing jitter, and optoelectronic oscillators. The benefits of signal identification, isolation, and separation of RF photonics are identified. Professionals are brought up to speed on RF frequency identification using optical injection locking. The book provides discussions on the fundamentals and advancements in integrated RF photonics and explains how to design an RF photonic downconverter. It covers additional applications of integrated photonic circuits and gives an explanation of why to use different modulation formats for different applications. "
Download or read book Potentialities of Coherent Systems in RF Photonics written by Robert Weverka and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mutually coherent RF photonic remoting is compared with mutually incoherent RF photonic systems. Current multichannel RF photonic systems for phased array antennas are implemented with mutually incoherent sources. Additional photonic processing operations with these systems cannot take advantage of courant fan in gain and suffer the DC bias build up well known in incoherent optical signal processing. Mutually coherent RF photonic systems are investigated and shown to have higher gain and higher dynamic range than incoherent systems. The trade-off between subarray partitioning size and link dynamic range is also studied.
Download or read book Potentialities of Coherent Systems in RF Photonics written by Robert Weverka and published by . This book was released on 1998 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mutually coherent RF photonic remoting is compared with mutually incoherent RF photonic systems. Current multichannel RF photonic systems for phased array antennas are implemented with mutually incoherent sources. Additional photonic processing operations with these systems cannot take advantage of courant fan in gain and suffer the DC bias build up well known in incoherent optical signal processing. Mutually coherent RF photonic systems are investigated and shown to have higher gain and higher dynamic range than incoherent systems. The trade-off between subarray partitioning size and link dynamic range is also studied.
Download or read book Photonic Integrated Phased Array Technology written by Tao Dong and published by Springer. This book was released on 2024-03-21 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book primarily focuses on the authors’ research and practical achievements in the field of photonic integrated phased arrays in recent years. Firstly, a comprehensive introduction on the concept, operation principles, and research progress of photonic integrated phased arrays is introduced. Then, detailed explanations of the optical antenna and array design in photonic integrated phased arrays are given. Combined with design cases of silicon-based optical phased arrays with different scales, the design methods for achieving low sidelobes are deeply researched, and the test principle and design of photonic integrated phased arrays are elaborated. Finally, the design, implementation, and test of photonic integrated phased arrays are illustrated through a detailed case study on the development of a silicon-based optical phased array chip and verify its short-distance space optical communication based on the chip. This book is dedicated to integrating the theory, design, processing, and test cases of photonic integrated phased arrays, and it provides a valuable reference for researchers and designers in the field of optical phased array technology.
Download or read book RF Photonics Materials and Devices written by and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our MURI research team has developed several innovative materials and devices that would enable a quantum leap in the performance of RF Photonic systems. We have also applied these devices to several novel system concepts and achieved world record performances. In the material development, we have produced new electro-optic polymers with record high electro-optic coefficients (r33 = 60 pm/v at 1330 nm and 45 pm/v at 1550 nm wavelengths), low optical loss (
Download or read book RF Photonics for Beamforming and Array Applications written by J. J. Lee and published by . This book was released on 2003 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: This lecture focuses on the applications of RF photonics for array antennas in signal distribution, beamforming, beam control, and antenna remoting. Examples are given to discuss the requirements, benefits, and design approaches of photonics for phased array antennas. The first demonstration of using photonics for a dual band array was conducted in 1990. Later a wide band conformal array controlled by photonics was built and tested. This example talks about the optical control of phased arrays by using fiber-optic links for RF and data remoting and a time-shifi beamforming network for wide instantaneous bandwidth. Last, the talk will illustrate how photonics can be used to form a wide band feed system for multibeam arrays.
Download or read book RF Photonics for Phased Arrays written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The initial goals of this project were to examine and develop practical photonic technologies suitable for shared aperture phased array environments. This effort resulted in an integrated optically variable capacitor (OVC) technology which can be implemented in a variety of RF circuit and radiating structures for optical control. This technology was developed using monolithic GaAs based photovoltaic devices and varactors developed at UCSB. A novel integration scheme and circuit were successfully developed and demonstrated in several RF circuits (tunable filters and phase shifters) and antennas (planar folded slot structures). An especially attractive feature of the technology is the extremely low optical power requirement; the tunable circuits were all controlled with less then 1 mW of optical power, in some cases less than 500 micro-W. In addition, the indirect nature of the optical control allows for the independent development and optimization of the optical and RF circuits, allowing for improved performance in both the optical and RF regimes, and also making the technology amenable to retrofitting. The resulting technology is well suited to control of shared aperture systems where the attractive features of optical control (light weight, low transmission loss, high speed, high isolation, microwave transparency, and immunity to EMI) are required.
Download or read book Spatial spectrum Estimation and Filtering of Radio Frequency Arrays Via Elemental Photonic Up conversion and Coherent Optical Processing written by Joseph C. Deroba and published by . This book was released on 2018 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for imaging Radio-frequency (RF) side-bands about an optical carrier signal, previously devised for passive, non-coherent, imaging of millimeter wave radiation is furthered for use in coherent reception of Radio-frequency signals. Theoretical formulation of a novel photonic beam-space beam-former is presented along with relationships to traditional beam-space array theory. The photonic beam-forming system requires each element of a Radio-Frequency (RF) array be optically up-converted to a laser carrier frequency and fed through a photonic processing system, where the output beam-space is sampled using an array of photo-detectors (or a commercial camera). Specic contributions of this work allow for a more power ecient optical system, amplitude calibration of the optical chain, arbitrary apodization (or tapering) of the output beam-space and application of the receiver system to multiple simultaneous domains (e.g. active sensing and communications in one receive array). Furthermore, a novel adaptive weighting approach is presented that utilizes outputs from both a commercial camera device and an array of high-speed photo-detectors to enable array adaptivity that is shown to be of low-latency when compared to existing techniques. Several experiments are performed using prototype hardware to characterize the system, component and algorithm-level performance enabling more capable designs within future work.
Download or read book Radar Processing Technology and Applications written by and published by . This book was released on 1998 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book MEMS and MOEMS Technology and Applications written by P. Rai-Choudhury and published by SPIE Press. This book was released on 2000 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: The silicon age that led the computer revolution has significantly changed the world. The next 30 years will see the incorporation of new types of functionality onto the chip-structures that will enable the chip to reason, to sense, to act and to communicate. Micromachining technologies offer a wide range of possibilities for active and passive devices. Recent developments have produced sensors, actuators and optical systems. Many of these technologies are based on surface micromachining, which has evolved from silicon integrated circuit technology. This book is written by experts in the field. It contains useful details in design and processing and can be utilized as a reference book or as a textbook.
Download or read book Spectroscopic Ellipsometry written by Harland G. Tompkins and published by Momentum Press. This book was released on 2015-12-16 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ellipsometry is an experimental technique for determining the thickness and optical properties of thin films. It is ideally suited for films ranging in thickness from sub-nanometer to several microns. Spectroscopic measurements have greatly expanded the capabilities of this technique and introduced its use into all areas where thin films are found: semiconductor devices, flat panel and mobile displays, optical coating stacks, biological and medical coatings, protective layers, and more. While several scholarly books exist on the topic, this book provides a good introduction to the basic theory of the technique and its common applications. The target audience is not the ellipsometry scholar, but process engineers and students of materials science who are experts in their own fields and wish to use ellipsometry to measure thin film properties without becoming an expert in ellipsometry itself.
Download or read book Silicon Photonics written by Graham T. Reed and published by John Wiley & Sons. This book was released on 2008-05-23 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon photonics is currently a very active and progressive area of research, as silicon optical circuits have emerged as the replacement technology for copper-based circuits in communication and broadband networks. The demand for ever improving communications and computing performance continues, and this in turn means that photonic circuits are finding ever increasing application areas. This text provides an important and timely overview of the ‘hot topics’ in the field, covering the various aspects of the technology that form the research area of silicon photonics. With contributions from some of the world’s leading researchers in silicon photonics, this book collates the latest advances in the technology. Silicon Photonics: the State of the Art opens with a highly informative foreword, and continues to feature: the integrated photonic circuit; silicon photonic waveguides; photonic bandgap waveguides; mechanisms for optical modulation in silicon; silicon based light sources; optical detection technologies for silicon photonics; passive silicon photonic devices; photonic and electronic integration approaches; applications in communications and sensors. Silicon Photonics: the State of the Art covers the essential elements of the entire field that is silicon photonics and is therefore an invaluable text for photonics engineers and professionals working in the fields of optical networks, optical communications, and semiconductor electronics. It is also an informative reference for graduate students studying for PhD in fibre optics, integrated optics, optical networking, microelectronics, or telecommunications.
Download or read book Ultrafast Photonics written by A. Miller and published by CRC Press. This book was released on 2019-08-22 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrafast photonics has become an interdisciplinary topic of high international research interest because of the spectacular development of compact and efficient lasers producing optical pulses with durations in the femtosecond time domain. Present day long-haul telecommunications systems are almost entirely based on the transmission of short burst
