| Towards an Integrated Optic Phase-Locked Oscillator |
01-Dec-2008 |
11 pages |
| Authors:
Michael R Watts; Jungwon Kim; Franz X Kaertner; Anthony L Lentine; William A Zortman; SANDIA NATIONAL LABS ALBUQUERQUE NM
|
 | A recent experiment, performed at the Massachusetts Institute of Technology, has demonstrated that by locking a microwave oscillator to an optical pulse train from a modelocked laser, exceptional timing stability can be achieved. In the experiment, a 10.225-GHz microwave oscillator was locked to an optical phase detection apparatus consisting of a modelocked laser, a Sagnac interferometer, and an optical phase modulator. A relative out-of-loop timing jitter of 6.8 femtoseconds (root ... |
|
| Innovative Technologies for Maskless Lithography and Non-Conventional Patterning |
01-Aug-2008 |
21 pages |
| Authors:
Avideh Zakhor; Andrew Neureuther; R F Pease; Olav Solgaard; Vivek Subramanian; Jeffrey Bokhor; Jean Frechet; CALIFORNIA UNIV BERKELEY SPONSORED PROJECTS OFFICE
|
| Collaborative research was conducted by the faculty known as the Lithography Network. This network brings together world class researchers over a broad set of technology areas essential to the success of maskless lithography and non-conventional patterning. The primary faculty by task is listed below: Task 1: Electron Beam Technology for Maskless Lithography, Professor R. Fabian Pease (Coordinator); Task 2: Spatial Light Modulators for Maskless lithography, Professor Olav Solgaard (Coordinator); Professor ... |
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| Limitations of Segmented Wavefront Control Devices in Emulating Optical Turbulence |
MAR 2008 |
111 pages |
| Authors:
Michael D. Plourde; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| Using a device to act as a surrogate for atmospheric turbulence in a laboratory is necessary to build and test optical systems for imaging, lidar, laser weapons, and laser communications. Liquid-crystal spatial light modulators (LC SLMs) and segmented micro-electro-mechanical-system (MEMS) deformable mirrors (DMs) are commonly used devices for altering wavefronts in order to simulate a portion of atmospheric turbulence. The best location of these devices was theoretically analyzed to obtain ... |
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| Devices and Control Strategies for AD HOC Optical Communications Networks |
26 JUN 2006 |
11 pages |
| Authors:
John Baillieul; Thomas Bifano; BOSTON UNIV MA DEPT OF AEROSPACE AND MECHANICAL ENGINEERING
|
| The research under this project has been aimed at proving the potential value of key elements (both hardware and operational concepts) that we plan to develop in initiating an ambitious program of research to develop a radical new technology for high-bandwidth, stealthy communication over free-space optical links. The results of the project have been several prototype systems which integrate optical components (a MEMS-based spatial light modulator (SLM) integrated with a ... |
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| Experimentation of Fiber-Optic Transmission of Light with Orbital Angular Momentum |
MAY 2006 |
17 pages |
| Authors:
Monisha K. Mahanta; STATE UNIV OF NEW YORK COLL AT ONEONTA
|
| The fiber-optic transmission of Laguerre-Gaussian photons carries the potential for removing the inconvenience of alignment and space required in free-space experimentation while introducing a severity of power loss caused by coupling inefficiency as the profile propagates through the fiber-optic components. This experimentation was planned to gain some insight into the behavior of the Laguerre-Gaussian profile when transmitted through fiber-optic channels in order to have the ability to set up a ... |
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| Active Optical Tracking with Spatial Light Modulators |
MAR 2005 |
95 pages |
| Authors:
Steven Mawhorter; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Two spatial light modulators are utilized for beam splitting, steering and tracking. Both linear and holographic phase screens are used in a demonstration of technology to allow real time tracking to communicate in a one-to-several type scenario. One SLM is used to apply a linear phase modulation to steer multiple beams onto a detector. The spots that are produced represent the targets as they move around the field of view ... |
|
| Study of Linearization of Optical Polymer Modulators |
FEB 2004 |
26 pages |
| Authors:
Anand Gopinath; Ross Schermer; Jaesang Oh; Desalegn Bereka; MINNESOTA UNIV MINNEAPOLIS
|
| To improve the Spur Free Dynamic Range of analog electro-optic modulators in the >10 GHz regime, techniques for improving the linearity of these devices must be developed. This report discusses an investigation into electro-optic directional couplers that use variable coupling in polymer-based waveguide structures. The approach begins with determining the desired response function, in this case a trapezoid. The Fourier transform method is then applied to synthesize the variable coupling ... |
|
| Photoinduced Magnetism |
19 DEC 2003 |
29 pages |
| Authors:
Arthur J. Epstein; OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS
|
| Remarkable progress has been achieved in our investigations of photo induced magnetism (PIM) in several families of molecule-based magnets during the past three years. The advancements include development of utilization of a new experimental method in studies of PIM, report of the first system with coexisting photomagnetic and spin glass behavior, proposal of a new mechanism for photomagnetic effects in Prussian blue magnets, and, discovery of the first organic-based light-modulated ... |
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| MEMS-Based Light Valves for Ultra-High Resolution Projection Displays |
DEC 2002 |
|
| Authors:
F. Picard; C. Campillo; Keith K. Niall; C. Larouche; H. Jerominek; DEFENCE RESEARCH AND DEVELOPMENT CANADAOTTAWA (ONTARIO)
|
 | Ultra-high resolution projectors will improve the visual systems of military flight simulators dramatically. There are changes in aspect angle and aspect rate which fixed-wing fighter pilots can discriminate at long standoff distances, but which cannot be displayed with adequate resolution by the visual systems of contemporary flight simulators. At present the limit of display resolution is fixed by the capacity of the display's projector. This issue is being addressed by ... |
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| Development of Liquid Crystal Spatial Light Modulators for mid-IR radiation, Addressed by Visible Radiation |
OCT 2002 |
37 pages |
| Authors:
Vladimir Y. Venediktov; INSTITUTE FOR LASER PHYSICS SAINT PETERSBURG (RUSSIA)
|
| This report results from a contract tasking Research Institute for Laser Physics as follows: Recent years has shown fast progress in the development of the technique of compensation for distortions in laser and imaging optical systems working in the visible spectral range through the use of dynamic holographic recording in optically-addressed liquid crystal spatial light modulators. However, this has not been extended to the mid-IR due to the lack of ... |
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| Semiconductor Photonic Components for RF Applications |
AUG 2002 |
36 pages |
| Authors:
Paul K. L. Yu; Yang Wu; G. L. Li; Yuling Zhuang; Phil Mages; A. R. Clawson; CALIFORNIA UNIV SAN DIEGO LA JOLLA OFFICE OF CONTRACT AND GRANT ADMINISTRATION
|
| The objective of this program was to advance the performance of the semiconductor waveguide modulator in externally modulated RF fiber-optic links for space-based and airborne platforms such as true time delay beam formation and beam steering subsystem in phased array antennas. Device and material approaches were investigated to improve the modulator based on semiconductor structures for achieving high spur free dynamic range (SFDR) and high frequency operation. In these approaches, ... |
|
| Unconventional Laser Guide Stars and Wavefront Correction of Blue Starlight |
28 MAY 2002 |
10 pages |
| Authors:
Robert W. Hellwarth; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| In this project we established by theory and experiment (1) that a 1/ 4 Joule, 20 ns, ultraviolet laser pulse could create (near 20 km altitude) a return signal to the transmitting telescope that would appear, for 20 ns, to have a brightness temperature of millions of degrees, and thus serve as a guide star for high-order corrections of blue starlight, (2) that a much lower energy (approx. one hundred ... |
|
| Protein-Based Three-Dimensional Memories |
JAN 2002 |
152 pages |
| Authors:
SYRACUSE UNIV NY OFFICE OF SPONSORED PROGRAMS
|
| Significant progress has been made in the remaining tasks, specifically materials development, protein optimization, computer interface development, and prototype development. The primary goal of the materials effort was to develop a polymer matrix for encapsulation of the protein, characterized by optical clarity, long-term stability, protein compatibility, and resistance to gel dehydration and contraction. Handled via subcontract to Wayne Wang of Carleton University in Ottawa, Canada, a poly(acrylamide) based hydrogel has ... |
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| Modulation of the Optical Absorption in Self-Organized InAs/GaAs Quantum Dots |
JUN 2001 |
|
| Authors:
P. N. Brunkov; A. Patane; A. Levin; L. Eaves; P. C. Main; RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG IOFFE PHYSICAL-TECHNICAL INST
|
| Capacitance and photocurrent spectroscopy are used to investigate a Schottky barrier structure containing a single layer of self-organized InA/ GaAs quantum dots. We show that applying a bias to the structure it is possible to change the electron occupation of the dot levels. This in turns is used for controlling the intensity of the light absorbed by the dots and proposed as a novel way for realizing optical modulators operating ... |
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| Effects of Crystallographic Orientation and Strain on Quantum Confined Structures and Devices |
15 APR 2001 |
148 pages |
| Authors:
Arthur L. Smirl; IOWA UNIV IOWA CITY
|
| The majority of the heterostructures grown by molecular beam epitaxy (MBE) and metalorganic chemical vapor deposition (MOCVD) over the last thirty years have been grown on substrates oriented in the 001 crystallographic direction. By comparison, there has been very little work on growth on other crystallographic axes or on applications of such structures. However, theoretical considerations (and several recent experiments) would indicate that unique and useful properties can be realized ... |
|
| All Optical Image Reject Down-Converter |
15 MAR 2001 |
20 pages |
| Authors:
Shaen J. Strutz; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An optical image reject down-converter for mapping a received radio frequency (RF) into an arbitrary intermediate frequency range and for precluding interference between the received signals. A received radio frequency signal is down-converted into an intermediate frequency band for use by an electronic circuit in other devices. Optical light is divided into a first path and a second path. Light in the first path is transferred into an optical sideband ... |
|
| Encoding of Complex Valued Composite Functions onto Spatial Light Modulators in Real-Time |
07 DEC 2000 |
160 pages |
| Authors:
Robert W. Cohn; LOUISVILLE UNIV KY ELECTRO OPTICS RESEARCH INST AND NANOTECHNOLOGY CENTER
|
| Spatial light modulators (SLM) are used as real-time programmable diffractive optics for potential applications to multi-object laser designation of moving objects. For real-time situations in which prior knowledge is unavailable, fast on-line design algorithms are required. The time requirements rule out many iterative design methods currently used for fixed pattern diffractive optics. Instead, encoding methods that map desired complex values onto the available modulation values provide the fastest realizations. As ... |
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| Photonics Circuits Technology for RF Photonics Systems |
OCT 2000 |
39 pages |
| Authors:
Paul K. Yu; S. S. Lau; W. X. Chen; A. R. Clawson; G. L. Li; CALIFORNIA UNIV SAN DIEGO LA JOLLA OFFICE OF CONTRACT AND GRANT ADMINISTRATION
|
| Optical transmission of analog RF signals is potentially useful in a number of applications including RF distribution systems. Such systems can be used in commercial CATV and wireless communications and in military communication and radar systems. With compatible components used at transmitters and receivers, analog fiber optic links suffer much less performance degradation than conventional coaxial cable links as the system bandwidth increases. In the ... |
|
| All Optical Image Reject Down Converter |
09 AUG 2000 |
15 pages |
| Authors:
Shane J. Strutz; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The optical image reject down converter maps a received radio frequency (RF) into an arbitrary intermediate frequency range and precludes interference between the received signals. A received radio frequency signal is downconverted into an intermediate frequency band for use by an electronic circuit in other devices. Optical light is divided, in a first path light is transferred into an optical sideband by a first optical modulator or phase modulator. Light ... |
|
| Ultrafast Quantum Well Optoelectronic Devices |
14 JUL 2000 |
14 pages |
| Authors:
David A. Miller; STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
|
| This project investigated novel optoelectronic switching and gating devices. These are based on the use of quantum well structures and electronic diodes. The devices can be used as optically controlled optical gates, allowing one light signal to pass in response to the presence of another optical signal, with the gating controlled by applied or induced electrical biases. Though the devices are internally optoelectronic, an important ... |
|
| Nonlinear Optical (NLO) Polymer Opto-Electronic Devices |
JUL 2000 |
95 pages |
| Authors:
Joseph Brandelik; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH SENSORS DIRECTORATE
|
| This document reviews work that supported the Cooperative Research Agreement CRDA 96-10l-WL-0l between AdTech Systems Research, Inc. and the Air Force Research Laboratory (AFRL). Prior to the formation of AFRL, the agreement was with Wright Laboratory. The objective of the CRDA was to utilize AdIech's Nonlinear Optical (NLO) polymers in an electro-optical waveguide switch. The report reviews electro-optic (E-O) modulators, especially the zero-gap directional ... |
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| Ultra High Bit Rate All Optical Communication System |
28 SEP 1999 |
|
| Authors:
Irl N. Duling III; Ronald D. Esman; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| This invention discloses a system that uses all optical elements for transmission, regeneration and reception of solitons in point-to-point, broadcast, ring and multi-user trunk type communication systems. Soliton pulses from an optical clock source are modulated by optical data pulses in an optical modulator producing a modulated channel of data pulses. Several channels are combined by an optical multiplexer into a network optical bit stream. This stream is carried by ... |
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| Synthesis and Processing of Improved Second Order Nonlinear Optical Materials |
15 SEP 1999 |
22 pages |
| Authors:
Larry R. Dalton; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF CHEMISTRY
|
| Polymeric EO modulators operating with drive voltages of 0.8-4.5 volts, bandwidths of 150 GHz, and insertion losses on the order of 5-6 dB have been demonstrated. These modulators have also been packaged as 3-D circuit structures and integrated directly with VLSI semiconductor electronics and with silica fiber optics. A variety of new device structures including phased array radar, ultrafast analog-to-digital converters, polarization insensitive modulators, ultrahigh bandwidth oscillators, and spatial light ... |
|
| Investigations of Crystalline Organic Nanostructures Grown by Ultra-High Vacuum and Vapor Phase Techniques |
SEP 1999 |
4 pages |
| Authors:
Stephen Forrest; PRINCETON UNIV NJ OFFICE OF RESEARCH AND PROJECT ADMINISTRATION
|
| We demonstrated the highly oriented growth of an organic salt using the new process of low pressure organic vapor phase deposition (LP-OVPD). This follows on our earlier work in the demonstration of atmospheric pressure OVPD. In the kinetic regime of LP-OVPD, however, there is improved surface morphology and crystalline alignment, to the point that we can now routinely achieve the alignment of DAST thin films across entire wafer surfaces. The ... |
|
| Simulation of Nanostructures Excitonic Spectra in an Electric Field |
18 JUN 1999 |
4 pages |
| Authors:
O. L. Lazarenkova; A. N. Pikhtin; SAINT PETERSBURG STATE ELECTROTECHNICALUNIV (RUSSIA)
|
|
| Fast Ferroelectric Spatial Light Modulators for Adaptive Optics Applications |
10 FEB 1999 |
32 pages |
| Authors:
Leonid Beresnev; GERMAN TELECOM RESEARCH CENTER DARMSTADT
|
| Ferroelectric liquid crystals (FLCs) possessing the DHF (deformed helix ferroelectric) effect were developed with pitch of helix of the order of 0.2 micrometers and spontaneous polarization of the order of 150nC/cm2 at room temperature. The tilt angle is variable in range 31-42 degrees. The response time T is variable in range 0.5-5ms, depending on mixture. The refractive indicies of all developed materials were measured. The ... |
|
| Membrane Mirror Characteristics for used with Real Time Holography |
1999 |
10 pages |
| Authors:
Richard A. Carreras; Dan K. Marker; James M. Wilkes; AIR FORCE RESEARCH LAB KIRTLAND AFB NM
|
| Space-based inflatable technology is of current interest to NASA DoD and in particular to the Air Force Research Laboratory. Potentially large gains in lowering launch costs through reductions in structural mass and volume are driving this activity. Diverse groups are researching and developing this technology for radio and radar antennas, optical telescopes and solar power and propulsion applications. Regardless of the use, one common requirement for successful application is the ... |
|
| Nonlinear Optoelectronic Integrated Circuits |
NOV 1998 |
74 pages |
| Authors:
Harold Fetterman; CALIFORNIA UNIV LOS ANGELES
|
| This program investigated the development of enabling technologies for optoelectronic integration and novel nonlinear concepts using these elements. As part of this effort we used optical mixing techniques to demonstrate optical modulators working above 100 GHz. Phototransistors were fabricated and tested at 60 GHz at high optical powers. Passive devices such as fiber gratings were tested and used as nonlinear transmission elements. |
|
| Technical Digest of the 1998 International Topical Meeting on Microwave Photonics MWP'98 Held at Sarnoff Corporation, Princeton, New Jersey, 12-14 October, 1998 |
OCT 1998 |
|
| Authors:
INSTITUTE OF ELECTRICAL AND ELECTRONICSENGINEERS INC PISCATAWAY NJ
|
| The wideband, low loss transmission capability of optical systems has led to considerable interest in their use for distributing and controlling microwave signals in applications such as antenna remoting, wideband cable television distribution, optically controlled phased arrays and microwave signal processing. The use of microwave sub-carrier multiplexing on dark fiber systems also may be of importance in the near future, and to realize multi-gigabit optical communication systems, microwave design techniques ... |
|
| STTR97 Electro-Optic Fiber |
31 AUG 1998 |
19 pages |
| Authors:
David Welker; SENTEL CORP PULLMAN WA
|
| We have accomplished all of the Phase 1 technical objective set forth in the original proposal: (1) we have demonstrated the process for making electrodes around the core of a single mode polymer optical fiber; (2) we have demonstrated that the core can be electric field poled with these electrodes; (3) we have determined the linear loss and guiding mode profiles of the poled cores; (4) we have measured Phase ... |
|
| Basic Materials and Fabrication Studies of Advanced Polymer Opto- Electronics |
15 AUG 1998 |
15 pages |
| Authors:
William H. Steier; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERINGAND ELECTROPHYSICS
|
| This report reviews the research under the ASSERT Award for the support of graduate students. The work includes measurements of the linear and nonlinear optical properties of new electro-optics polymer materials developed by the Chemistry Department, applications of these materials to high speed infrared modulators, and a discussion of the issues involved in packaging these modulators. The report also includes a review of work on ... |
|
| Organization of the 1997 Ultrafast Electronics and Optoelectronics Topical Meeting |
01 JUN 1998 |
312 pages |
| Authors:
Stephen D. Fantone; OPTICAL SOCIETY OF AMERICA WASHINGTON DC
|
| The Ultrafast Electronics and Optoelectronics topical meeting explored advances in high speed phenomena in the areas of optics, optoelectronics, and electronics. Topics discussed were classified into the general areas of physics, general and measurement, materials, electronics, optoelectronics, all optical techniques, and applications. |
|
| Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides: Applications and Fundamentals. Technical Digest Series, Volume 17 |
26 MAY 1998 |
369 pages |
| Authors:
Stephen D. Fantone; OPTICAL SOCIETY OF AMERICA WASHINGTON DC
|
| The OSA topical meetings that received support under this grant provided a forum for researchers in various specialty areas to meet and share ideas and technology in their fields. Following are the meetings that were supported by this grant: (1) Optics in Computing; (2) topics for discussion included optical interconnections within electronic computers, system demonstrations of digital optical computing optical neural networks, optical signal processing and novel optical processing architectures, ... |
|
| Optics in Parallel Shared Memory Computing |
27 APR 1998 |
14 pages |
| Authors:
B. K. Jenkins; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES SIGNAL AND IMAGE PROCESSING INST
|
| A summary of accomplishments on the grant, "Optics in Parallel Shared Memory Computing", over the period 7/1/93-10/31/97, is given. Accomplishments include the design of a parallel shared memory optical/electronic computer, and a centralized control algorithm for its processor-to-memory interconnection network. The grantee has also designed a volume-holographic shared memory system that can implement a set of parallel-access memory modules in a system comprising a single photorefractive crystal and 2 arrays ... |
|
| Optical RF Spectrum Analyzer |
31 MAR 1998 |
|
| Authors:
Tae K. Oh; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An optical RF spectrum analyzer which is suitable for determining the real-time spectral frequency content of radar return signals. The optical RF spectrum analyzer includes a demodulator for demodulating an input RF signal to produce a time-varying voltage signal at its output, and a sample and hold circuit for sampling the time-varying voltage signal to obtain and hold a prescribed number of sample of the time-varying voltage signal during each ... |
|
| Low Voltage, High Speed & High Contrast Electrooptical Thin Film Devices for Free Space Optical Interconnects |
06 MAR 1998 |
18 pages |
| Authors:
Sanat Sashital; Sadik Esener; TRW INC REDONDO BEACH CA
|
| Speed and 'crosstalk' limitations, encountered by conventional metal transmission lines in 'chip to chip' data/information communication are overcome by Free Space Optical Interconnects (FSOI) for future ultra fast computing/ communications systems. Fabry-Perot thin film Electrooptic(EO) modulators (STFP) function as high speed, low voltage operable optical interconnects. Development and demonstration of such STFP's based on ferroelectric/EO F-P modulators is described. For self tuning, with respect to F-P cavity Ferroelectric(FE)/EO thin film) ... |
|
| Imaging Through Fibers, Phase 3 |
MAR 1998 |
23 pages |
| Authors:
Emmett N. Leith; MICHIGAN UNIV ANN ARBOR
|
| Direct relay of images over single mode (SM) fiber has been demonstrated by coherence (holographic) methods. For the usual two dimensional case, the need is eliminated for prior digitization of input images, and no additional fiber coupling is required. Interestingly, the method functions for 3-D images just as well. Experiments carried out in the previous phase of this work demonstrated holographic image transmission over a pair of single mode fibers ... |
|
| Fabrication of LD-3 Polymer Directional Couplers |
1998 |
20 pages |
| Authors:
Ray T. Chen; TEXAS UNIV AT AUSTIN MICROELECTRONICS RESEARCH CENTER
|
| LD-3 polymer directional couplers have the potential use as low- voltage modulators and switches. They can be integrated into module-to-module systems using currently available VLSI fabrication techniques. Modes of channel waveguides arc calculated and coupling lengths are determined using BPM_CAD. LD- 3 polymer directional couplers arc designed and fabricated to operate at 1.3 microns. Waveguide propagation losses, device characterization, demonstration of cross coupling and packaged device ... |
|
| Imaging of Spatially Separated Electron-Hole Plasma Dynamics in Nipi- Doped Photonic Materials |
15 DEC 1997 |
7 pages |
| Authors:
Daniel H. Rich; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The aim of this research is to examine the structural and optical properties of strained InGaAs/GaAs quantum wells, quantum wires (QWRs) and dots (QDs) using new spatially, spectrally, and temporally resolved electron probes. The presence of defects will degrade the nonlinear optical properties and impact the performance of spatial light modulators and lasers. The carrier recombination dynamics and nonlinear optical properties in nipi-doped InGaAs/ GaAs quantum wells were studied using ... |
|
| Optical Wavelet Transform |
OCT 1997 |
27 pages |
| Authors:
Samuel P. Kozaitis; FLORIDA INST OF TECH MELBOURNE
|
| We described a joint transform correlator (JTC) that used multiple input images encoded in the spatial domain. This allowed various combinations of cross correlations between input images to be performed. We extended the theory of a JTC to multiple inputs, and provided experimental results for four inputs with an optically-addressed spatial light modulator in the Fourier plane. We proposed a system to perform multiwavelet feature extraction. For multiwavelet scales, the ... |
|
| Photonic Band Structure for Optical Inter-Connect Arrays and Logic Functions |
15 SEP 97 |
21 pages |
| Authors:
Eli Yablonovitch; CALIFORNIA UNIV LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| We have investigated the electromagnetic properties of a two dimensional photonic crystal array of vertical cavities for use in nonlinear optical image processing. We have determined the two dimensional photonic band structure of the array, and we discuss how it is influenced by the degree of interaction between cavities. We have studied the properties of defects in the 2-D lattice, and have shown that neighboring cavities will interact through their ... |
|
| Femtosecond Laser System for Research on High-Speed Optical Transmultiplexing and Coding |
SEP 1997 |
5 pages |
| Authors:
Andrew M. Weiner; PURDUE UNIV LAFAYETTE IN SCHOOL OF ELECTRICAL ENGINEERING
|
| A key goal of our research is to demonstrate all-optical methods for generation, processing, and transmultiplexing (data format conversion) of ultrafast lightwave signals. Recently our effort has focused on incorporating pixellated optoelectronic modulator arrays into femtosecond pulse shaping systems. This work could lead to pulse shaping systems generating (or processing) data signals and packets which can be reprogrammed at rates in the nanosecond regime. This would fill an important need ... |
|
| An Optically Based Pressure Measurement Approach for Interior Ballistic Testing |
AUG 1997 |
50 pages |
| Authors:
Michael J. McQuaid; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This report describes a recent patent disclosure for obtaining an optically based measurement of pressure. The concept, which utilizes pressure- induced changes in polarization to modulate intensity, incorporates a means of addressing a universal shortcoming of optically based techniques-namely, temperature sensitivity. The invention has application for any pressure regime, but will be particularly advantageous for electrically or physically harsh environments. Embodiments of this concept may provide a suitable replacement for ... |
|
| Dense 3D Integrated Electronic/Photonic Computing Structures Enabled by Diffractive Optical Elements |
AUG 97 |
42 pages |
| Authors:
Armand R. Tanguay Jr.; B. K. Jenkins; Alexander A. Sawchuk; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERINGAND ELECTROPHYSICS
|
| Substantial progress is reported on the development of a novel photonic multi-chip module technology, and on the passive optical components that provide parallel chip to chip interconnections within the module. This progress includes extensive characterization of a compact optical power bus to distribute an optical array of readout beams to a set of modulators; novel design and algorithm development, successful fabrication, and characterization of diffractive optical elements (DOE's) for use ... |
|
| Linear Phase Conjugation for Atmospheric Aberration Compensation |
27 JUL 1997 |
12 pages |
| Authors:
Robert J. Grasso; Eddy A. Stappaerts; NORTHROP GRUMMAN CORP ROLLING MEADOWS IL DEFENSE SYSTEMS DIV
|
| Northrop Grumman reports on a program utilizing Linear Phase Conjugation to compensate for atmospheric induced aberrations that severely limit laser performance. In a program to improve both the beam quality and laser energy delivered to the target, Northrop Grumman has developed a novel aberration compensation technique. This technique, hereafter referred to as Active Tracking System, utilizes a silicon Spatial Light Modulator as a dynamic wavefront reversing element to undo aberrations ... |
|
| Reduced Carrier, High Dynamic Range I/O Modulators |
JUN 1997 |
53 pages |
| Authors:
Gregory J. McBrien; Glen W. Drake; UNIPHASE TELECOMMUNICATIONS PRODUCTS BLOOMFIELD CT
|
| This report provides details on the fabrication and characterization of reduced carrier electrooptic modulators for potential application in high performance RF links. The report details how the optical splitting ratio was determined and the results of verification testing of reduced carrier links to prevent overload of optical detectors. The result was a slightly improved third order distortion product. This improvement could range up to 5 dB depending upon the power ... |
|
| Electrooptic Modulation Research. Electrooptic Modulators |
APR 1997 |
193 pages |
| Authors:
H. J. Caulfield; Zhenli Zhang; ALABAMA A AND M UNIV NORMAL DEPT OF PHYSICS
|
| The work is aimed mainly at improving the overall performance of Pockels electrooptic modulators. Current Pockels cells have very limited field of view, high driving voltages, and low speed. This severely limits Pockels cells for many practical applications. It would be very important to have a large field of view, low driving voltage, and high speed Pockels cell. A Pockels cell can be explained using polarization ... |
|
| Protein-Based Branched-Photocycle Three-Dimensional Optical Memories |
APR 97 |
30 pages |
| Authors:
Robert R. Birge; SYRACUSE UNIV NY DEPT OF CHEMISTRY
|
| The promise of new architecture and more cost effective miniaturization has prompted interest in biomolecular optical memories. We examine here the use of the protein bacteriorhodopsin in a branched photocycle three dimensional memory. By using a sequential one photon process, parallel read and write processes can be carried out without disturbing data outside of the irradiated volume. A bench scale prototype was developed and tested. The prototype used active matrix ... |
|
| Integrated Optoelectronics Using Injection-Locked Vertical Cavity Surface Emitting Lasers |
10 MAR 97 |
54 pages |
| Authors:
T. B. Simpson; J. M. Liu; JAYCOR SAN DIEGO CA
|
| This Final Report, describes experimental, analytical and numerical investigations of injection locking in a vertical cavity surface emitting laser for applications which benefit from optical control of microwaves. It concentrates on strong injection locking, where the imposition of the external optical signal not only locks the slave laser to the injected signal but also modifies the dynamic characteristics of the coupling between the optical field and the gain medium. This ... |
|
| Photonic Technology Development for Densely-Interconnected Neural Networks |
27 FEB 97 |
27 pages |
| Authors:
B. K. Jenkins; Anupam Madhukar; Armand R. Tanguay Jr; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING AND MATERIALS SCIENCE
|
| Progress on the grant, 'Photonic Technology Development for Densely Interconnected Neural Networks', is described. Substantial progress has been made in the following areas. Artificial neural network models (or implementation using photonics have been developed and analyzed. Radial basis function neural networks for analog nonparametric density function estimation and pattern recognition, and multilayer backward error propagation neural networks both for implementation on photonic hardware, have been characterized. Emphasis has been on ... |
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Reports by Keyword(s)
LIGHT MODULATORS
