| Q-Switched and Mode Locked Short Pulses from a Diode Pumped, YB-Doped Fiber Laser |
26-Mar-2009 |
115 pages |
| Authors:
Seth M Swift; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
 | A diode-pumped, ytterbium (Yb)-doped fiber laser system was designed and demonstrated to operate in continuous wave (cw), passively Q-switched and possibly passively mode locked operation. To our knowledge, this was the first fiber laser oscillator built at the Air Force Institute of Technology. A Cr4+:YAG (Chromium: Ytterbium Aluminum Garnett) crystal was used as a saturable absorber to generate Q-switched pulses. Attempts to mode lock the laser were performed using a ... |
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| Linearized Optically Phase-Modulated Fiber Optic Links for Microwave Signal Transport |
03-Mar-2009 |
164 pages |
| Authors:
Bryan M Hass; MARYLAND UNIV COLLEGE PARK LAB FOR PHYSICAL SCIENCES
|
| Several novel phase-modulated fiber optic links for analog or microwave signal transport up to at least 20 GHz frequency are theoretically developed and experimentally demonstrated. Each link uses a linearization technique exploiting the Lithium Niobate modulator's electro-optic anisotropy between orthogonal crystallographic axes that has not previously been applied to phase-modulated links. This technique and its variants suppress the dominant third-order distortion product to extend the sub-octave spur-free dynamic range of ... |
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| Thermomechanical Properties of Center-Reinforced Aluminum |
Mar-2009 |
300 pages |
| Authors:
Geofrey S Cox; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| The rule of mixture approach was shown to produce an accurate theoretical prediction of the room temperature elastic modulus values when compared to the experimental results. The laminate's modulus value remained relatively constant over the -55C to 80C temperature range, indicating stable behavior despite temperature changes. Blunt notch tests also revealed that the laminate's strength was not significantly reduced due to the presence of small holes. Finally, fatigue testing demonstrated ... |
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| Photonic Crystals for Infrared Nonlinear Optics |
Feb-2009 |
34 pages |
| Authors:
Yoel Fink; Marin Soljacic; Peter T Rakich; Ayman Abouraddy; Zachary Ruff; Ofer Shopira; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| Here we summarize our progress in the development of 2- to 5-micron wavelength supercontinuum sources through grant number FA8650-05-C-5426 over the life of the program. The key developments over the past 3 years include 1) A proof-of-principle demonstration of a novel, efficient mid-IR Raman laser source in silica materials system, yielding efficient spectral transfer to 2.41 microns. (The demonstrated system can be naturally extended in wavelength to 5microns and beyond); ... |
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| Comparison of the Noise Penalty of a Raman Amplifier Versus an Erbium-doped Fiber Amplifier for Long-haul Analog Fiber-optic Links |
17-Dec-2008 |
17 pages |
| Authors:
Preetpaul S Devgan; John F Diehl; Vincent J Urick; Keith J Williams; NAVAL RESEARCH LAB WASHINGTON DC
|
| A Raman amplifier is compared to an erbium-doped fiber amplifier for a 14 km analog fiber-optic link requiring the amplifier pump at the end of the link. The noise penalty for each amplifier at a given photocurrent is measured and compared. An analytical expression comparing the analog metrics as a function of noise penalty and photocurrent for different amplifiers is derived and used. The Raman amplifier has a lower noise ... |
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| Photonic Front-End and Comparator Processor for a Sigma-Delta Modulator |
01-Sep-2008 |
85 pages |
| Authors:
Kenny E Escobar; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis examines the role of photonics and integrated optics (IO) for use in analog-to-digital conversion in electronic warfare (EW) intercept receivers. The IO approach uses a continuous wave (CW) distributed feedback (DFB) laser diode at a peak wavelength of 1550 nm to oversample two Mach-Zehnder interferometers (MZIs). The MZIs are part of sigma-delta ( ) modulator-based analog-to-digital converter (ADC) oversampling architecture. A ring resonator accumulator is embedded within a ... |
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| Deterministic Entangled Nanosource |
Aug-2008 |
10 pages |
| Authors:
Galina Khitrova; ARIZONA UNIV TUCSON
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| During the three years of this grant, conclusions were reached that are important for the future of semiconductor cavity QED utilizing photonic crystal nanocavities. A new way was found to scan the cavity mode by condensation of xenon or nitrogen while keeping the quantum dot cold to minimize dephasing. Absorption was shown to reduce the cavity Q when the dot density is 400 per square micron. Lasing with a soft ... |
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| Stimulated Brillouin Scattering Phase Conjugation in Fiber Optic Waveguides |
01-Jul-2008 |
199 pages |
| Authors:
Steven M Massey; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| The objective of this research effort was to demonstrate the path to continuous wave, coherent beam combination through stimulated Brillouin scattering phase conjugation in optical fiber. This work experimentally determined the fiber parameters necessary for phase conjugation in step-index optical fiber. Continuous wave phase conjugation using stimulated Brillouin scattering in step-index fibers was achieved for the first time with a fidelity of 0.8 and a threshold power of 16 W ... |
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| Ensemble Techniques for Determining Globally Optimal Designs for Problems with Broadly Stated Design Objectives |
27-Apr-2008 |
4 pages |
| Authors:
Chunming Wang; Gary I Rosen; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES
|
| In this project we have investigated the use of global optimization techniques for device design problems in photonics and electronics. Using several concrete device design problems as guides, we have defined a sub-class of global optimization problems with high-dimensional design space as the main focus of our effort. We have evaluated optimization approaches including Genetic Algorithm and Simulated Annealing for this class of problems. This evaluation confirmed our previous experience ... |
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| Characterization of an Electro-Absorption Modulator Design With High-Dynamic Range for Broadband Analog Applications |
Mar-2008 |
15 pages |
| Authors:
Paul Yu; Ivan Shubin; Terrance McDonald; Charles Schick; Paul Cook; Henry Zmuda; Songsheng Tan; Nancy Stoffel; Brian McKeon; Richard Michalak; Reinhard Erdmann; Rebecca Bussjager; Xiaobo Xie; AIR FORCE RESEARCH LAB ROME NY
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| An electro-absorption modulator (EAM) is designed to optimize dynamic range performance over 20 GHz bandwidth. The single stripe waveguide enables an extremely compact and integrated package to be fabricated with single mode fiber pigtails. The transfer function's shape permits suppression of higher order intermodulation products, yielding a spur-free dynamic range exceeding that of Mach-Zehnder designs. A dilute optical core diverts energy flow from absorbing layers into a low loss waveguide; ... |
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| Bio-Inspired Organic/Inorganic Hybrid Electronic and Photonic Materials and Structures |
31 DEC 2007 |
10 pages |
| Authors:
Alex K-Y. Jen; Mehmet Sarikaya; David Ginger; WASHINGTON UNIV SEATTLE DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| The goal of this project was to use DNA and protein as templates to assemble nanoparticles and functional molecules for photonic and electronic applications such as plasmon-enhanced fluorescence and surface-enhanced Raman scattering (SERS) (Fig. 1). Towards this goal, we have utilized both genetic and materials engineering tools. We have followed the molecular biomimetic approach in the assembly of nanoparticles. We have developed protocols using involving biological attachment of nanoparticles and ... |
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| Towards Fieldable Rapid Bioagent Detection: advanced Resonant Optical Waveguide and Biolayer Structures for Integrated Biosensing |
NOV 2007 |
23 pages |
| Authors:
Lawrence A. Hornak; Dimitris Korakakis; Aaron Timperman; WEST VIRGINIA UNIV RESEARCH CORP MORGANTOWN
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| This research project established the understanding necessary for the stacked planar affinity-regulated resonate optical waveguide (SPARROW) architecture to serve as a transducer device platform for rapid biomolecular detection. SPARROW structures have been grown with waveguide losses of less than 1 dB/cm. Thin biolayers of less than 10 nm were achieved and SAM attachment to polycrystalline surfaces studied. SPARROW transducer measurements were conducted using sucrose analyte solutions applied to the top ... |
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| An Evaluation of Compact Laser Drivers for Field-Deployed Analog Fiber-Optic Systems |
31 OCT 2007 |
13 pages |
| Authors:
Vincent J. Urick; Preetpaul S. Devgan; Lee A. Swingen; John F. Diehl; NAVAL RESEARCH LAB WASHINGTON DC
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| Various laser drivers are analyzed experimentally to determine the impact on the performance of an analog photonic link. For field-deployed units, the NRL-designed supply provides superior noise performance over commercial devices, but the lowest noise is achieved via a bench-top low-noise laser driver. |
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| Measurement of Chromatic Dispersion using the Baseband Radio-Frequency Response of a Phase-Modulated Analog Optical Link Employing a Reference Fiber |
19 SEP 2007 |
20 pages |
| Authors:
Jason D. McKinney; John Diehl; NAVAL RESEARCH LAB WASHINGTON DC
|
| In this work we demonstrate a new technique for measuring the chromatic dispersion of an optical fiber using the baseband RF response of a phase-modulated analog optical link in concert with a well-characterized fiber that serves as a dispersion reference. We show that optical phase modulation provides increased measurement resolution and immunity to optical modulator bias-drift as compared to baseband methods utilizing optical intensity modulation. In addition, we provide a ... |
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| Laser Noise and its Impact on the Performance of Intensity-Modulation with Direct-Detection Analog Photonic Links |
10 AUG 2007 |
27 pages |
| Authors:
Vincent J. Urick; Preetpaul S. Devgan; Jason D. McKinney; James L. Dexter; NAVAL RESEARCH LAB WASHINGTON DC OPTICAL SCIENCES DIV
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| The equations for radio-frequency gain, radio-frequency noise figure, compression dynamic range and spurious-free dynamic range are derived for an analog photonic link employing intensity modulation and direct detection. In particular, the impact of laser noise on the performance of an analog photonic link is demonstrated in terms of these metrics. We describe the experimental procedure for measuring laser noise and the measured laser noise spectra of lasers suitable for analog ... |
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| DARPA Quantum Network Testbed |
JUL 2007 |
|
| Authors:
Chip Elliott; Henry Yeh; BBN TECHNOLOGIES CAMBRIDGE MA
|
 | BBN has designed and built the world's first Quantum Network testbed, delivering end-to-end network security via high-speed Quantum Key Distribution (QKD), and testing that Network against sophisticated eavesdropping attacks. BBN has fielded this ultrahigh-security network into commercial fiber across the metro Boston area. BBN's QKD network comprises 10 nodes. It is both extremely secure and 100% compatible with today's Internet technology. Four of the 10 nodes are running 24x7 over ... |
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| Developing Pulsed Fiber Lasers |
15 JUN 2007 |
40 pages |
| Authors:
Steven Brueck; Craig Robin; Thomas M. Shay; NEW MEXICO UNIV ALBUQUERQUE CENTER FOR HIGH TECHNOLOGY MATERIALS
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| Laser power is at a premium and a diffraction limited optical beam delivers the maximum intensity on target. Therefore, the better the beam quality, the lower the system cost and complexity is reduced considerably by using high quality beams. Single mode optical fiber lasers and amplifiers produce near diffraction limited beams and therefore will result in near diffraction limited optical beams thus they will provide the highest intensities at the ... |
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| Increased Cross-Correlation in Cascaded Four-Wave Mixing Processes |
11 JUN 2007 |
8 pages |
| Authors:
Jingyun Fan; Alan L. Migdall; L. J. Wang; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
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| We report the measurement of increased noise cross-correlation between stokes and anti-stokes beams created in cascaded four-wave mixing processes with dual pump wavelengths. This method may be useful in creating highly correlated twin beams for various applications including quantum information processing. |
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| Terahertz Fiber Laser for Explosives Detection |
JUN 2007 |
12 pages |
| Authors:
Antonije Radojevic; CHARLES STARK DRAPER LAB INC CAMBRIDGE MA
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| The C.S. Draper Laboratory, with 30 years of experience in instrument and sensor research and development, and the University of Massachusetts Terahertz Laboratory, with 15 years of research in the development terahertz receivers and focal plane arrays, propose to develop and characterize a fundamentally new method for generating terahertz radiation. Our approach will enable the development of a class of high power (>=100 mW), portable, coherent, terahertz radiation source devices ... |
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| New Generation Photonics Materials: Design, Development, Characterization, and Applications |
31 MAR 2007 |
37 pages |
| Authors:
Paras N. Prasad; Guang S. He; STATE UNIV OF NEW YORK AT BUFFALO INST FOR LASERS PHOTONICS AND BIOPHOTONICS
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| Significant research achievements have been accomplished in development of multi-photon active materials and applications as well as of novel nanocomposites materials for opt-electronic technology. The specific research progress achieved by this grant support can be summarized as follows. (I) Nonlinear optical limiting and stabilization of 1064-nm laser pulses using a novel two-photon absorbing liquid dye salt system. The major advantage of using a neat liquid dye salt as the two-photon ... |
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| A Broadband High Spectral Brightness Fiber Based Two-Photon Source |
19 MAR 2007 |
8 pages |
| Authors:
Jingyun Fan; Alan L. Migdall; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
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| After characterizing the Raman scattering in a fused silica polarization-maintaining microstructure optical fiber, we built a fiber-based two-photon light source of high spectral brightness, broad spectral range, and very low noise background at room temperature. The resulting bright low-noise two-photon light can be used for a number of quantum information applications. |
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| Development of a Quantum Repeater for Long-Distance Quantum Communication Using Photonic Information Storage |
14 MAR 2007 |
17 pages |
| Authors:
Mikhail Lukin; PRESIDENT AND FELLOWS OF HARVARD COLL CAMBRIDGE MA OFFICE OF SPONSORED RESEARCH
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| In this project, we have carried out the pioneering work for long-distance quantum communication using atomic ensembles for photon-state storage and for implementation of quantum repeaters. This work was followed by many groups and is now considered as one of the most promising approaches to overcoming photon losses in long-distance quantum communication. Specific highlights include theoretical proposals for quantum repeaters based on atomic ensembles (Nature, 414, 413, 2001), atom-atom correlations ... |
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| Direct Diode Pumped Raman Fiber Amplifier Based on a Multimode Graded Index Fiber |
MAR 2007 |
62 pages |
| Authors:
C. J. Baird; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
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| The direct pumping of a Raman fiber amplifier (RFA) was attempted using an array of four 25W, fiber pigtailed diodes at 936nm, combined via a 7 channel fiber beam combiner. The initial attempt was conducted using a 1.8 km, 100 micron core, GRIN fiber with an NA of .29 and attenuation 3.6 dB/km at 936nm. While amplification was not achieved, over 200mW of conversion was shown, with 10.4W of pump ... |
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| Assured Reference Technology Research (ARTHR) Project. Delivery Order 0004: Fiber-Optic RF Distribution (FORD) (PREPRINT) |
FEB 2007 |
34 pages |
| Authors:
Daniel McLaughlin; Jeffrey Wells; Timothy Wurthh; Daniel Dresher; NORTHROP GRUMMAN SPACE TECHNOLOGY DAYTON OH
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| The use of fiber optics is considered herein as a means to distribute Radio Frequency (RF) signals across Printed Circuit Boards (PCB). The use of fiber optics is studied with an emphasis on reducing inter-board Electromagnetic Interference (EMI). High performance RF circuits are especially sensitive to EMI and other Radio Frequency Interference (RFI), resulting in poor circuit to circuit isolation, spurious signals, additional filtering requirements, and increased shielding constraints. Fiber-optic ... |
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| Spin-Based Photonics via Electromagnetically Induced Transparency |
NOV 2006 |
4 pages |
| Authors:
Hailin Wang; J. Furdyna; R. Binder; OREGON UNIV EUGENE
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| Research efforts have focused on the development and implementation of electromagnetically-induced transparency (EIT) from electron spin coherence in a semiconductor quantum well waveguide. Experimental studies have shown an induced transmission resonance arising from the electron spin coherence in the differential transmission spectrum. The induced resonance can be viewed as a signature of EIT from the electron spin coherence. Studies of the polarization and magnetic field dependence further confirm the physical ... |
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| Photonic Band Gap Devices for Commercial Applications |
12 OCT 2006 |
43 pages |
| Authors:
Ahmed Sharkawy; Shouyuan Shi; Caihua Chen; Dennis Prather; EM PHOTONICS INC NEWARK DE
|
| In our effort to develop and demonstrate the design, fabrication, and experimental characterization of functional photonic crystal devices in both 2D and 3D structures, we identified various tasks and goals towards achieving the proposed applications. Two-dimensional photonic crystal structures will be used for in-plane optical signal distribution and routing while three-dimensional structures will be used for out-plane signal distribution, to provide high-density optically interconnected optoelectronic PhC circuits to distribute the ... |
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| Developing and Modeling Fiber Amplifier Arrays |
01 SEP 2006 |
8 pages |
| Authors:
Richard Berdine; NEW MEXICO UNIV REGENTS ALBUQUERQUE
|
| High Energy Lasers (HEL) are required for a number of military applications including missile defense. Electric lasers are considered the laser of choice in the long term since the energy supply is rechargeable and clean. The preferred type of electric laser is the semiconductor diode-pumped solid state laser, which integrates well with other sensors and electro-optical elements in an aerospace, land, or maritime environment. One method for scaling solid state ... |
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| Design, Testing, and Safety Considerations of an Optically Isolated Firing Set |
SEP 2006 |
14 pages |
| Authors:
Mark W. Heyse; Keith A. Jamison; Ronald E. Stearns; AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIRECTORATE
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| Experimental investigations at the Air Force Research Laboratory's Munitions Directorate required a firing set to initiate detonators in ultra-high-voltage experiments, but commercial firing sets with adequate high voltage isolation could not be found. To resolve this issue a Directorate team designed, fabricated a new firing set, verified that it met all design requirements, and obtained safety board approval for its use. The patented design uses all plastic fiber optic cables, ... |
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| Diamond Shaped Ring Laser Characterization, Package Design and Performance |
SEP 2006 |
9 pages |
| Authors:
Rebecca J. Bussjager; Steve Johns; Michael Hayduk; Joseph Osman; Reinhard Erdmann; Brian McKeon; Charles Shick; Nancy Stoffel; Songsheng Tan; Wesley Bacon; AIR FORCE RESEARCH LAB ROME NY SENSORS DIRECTORATE
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| A semiconductor diamond-shaped ring laser was fabricated and packaged for further test and analysis as an element in digital photonic logic. The optical characteristics of the ring laser were quantified in order to design a prototype package. The mode field was found to be quasi-circular. Based on the mode field of the laser, coupling curves were calculated and Corning OptiFocus(TM) Lensed fiber was chosen to use for the four fiber ... |
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| Fabrications of Photonic Bandgap Structures in Si and Ge Substrates Using Laser-Assisted Nanoimprinting of Self-Assembled Nanoparticles |
SEP 2006 |
32 pages |
| Authors:
Yongfeng Lu; NEBRASKA UNIV LINCOLN DEPT OF ELECTRICAL ENGINEERING
|
| The fabrications of periodic dielectric structures at nanoscales, which are called photonic bandgap (PBG) structures, have attracted the interests of researchers due to the applications in a variety of fields such as optoelectronics, photonics, sensors, photo catalysts, and energy harvesting coatings. One- and two-dimensional PBG structures have been realized because such systems are very amenable to conventional fabrication techniques. However, three-dimensional (3-D) PBG structures are still remained as an important ... |
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| Nonlinear Wave Propagation |
31 AUG 2006 |
137 pages |
| Authors:
Mark J. Ablowitz; COLORADO UNIV AT BOULDER DEPT OF APPLIED MATHEMATICS
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| The dynamics and properties of mode locked lasers, such as Titanium:sapphire lasers, that produce ultrashort pulses were modeled and comparisons with experiments carried out. An important characteristic of short pulse lasers is the carrier-envelope phase (CEP) slip which is the phase offset between carrier and envelope from pulse to pulse in the pulse train. Control of the phase slip allows researchers to stabilize trains of ultrashort pulses, which are very ... |
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| MiPRI Collaboration on High Power Microwave and Vacuum Electronics Source Research |
01 AUG 2006 |
16 pages |
| Authors:
Edl Schamiloglu; Ron Gilgenbach; Y. Y. Lau; Rick Temkin; NEW MEXICO UNIV ALBUQUERQUE
|
| High Power Microwave (HPM) and Vacuum Electronics (VE) sources have been studied in support of Air Force needs, under the auspices of the MiPRI initiative, a congressionally mandated program. A consortium of three universities led by the University of New Mexico and including the University of Michigan and MIT have teamed up to perform research on two sources of current interest to the Air Force: i) the relativistic magnetron operating ... |
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| Why Photonic Systems for Space? |
AUG 2006 |
|
| Authors:
Norman P. Bernstein; George A. Brost; Michael J. Hayduk; James R. Hunter; James E. Nichter; Paul M. Payson; Paul L. Repak; AIR FORCE RESEARCH LAB ROME NY SENSORS DIRECTORATE
|
| Future space-based platforms can and will benefit from the implementation of photonics in both analog and digital subsystems. This paper discusses the potential applications and advantages of photonics to space-based platforms. These applications include radiofrequency distribution links, true time delay, local oscillator generation, photonically implemented signal processing, and high speed analog-to-digital signal conversion. |
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| Addressing the Requirements for RF Photonics |
AUG 2006 |
10 pages |
| Authors:
George A. Brost; AIR FORCE RESEARCH LAB ROME NY SENSORS DIRECTORATE
|
| This paper addresses the relationship between system requirements and device specifications and figures of merit for RF Photonic applications. This paper has focused on the optical modulator, as it is the key component in achieving the required RF performance within the constraints of space-based platforms. The modulator transfer function can be used to express the key parameters of the modulator, which are then used characterize the photonic link performance; G, ... |
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| Radiation Resistant Polymer-Based Photonics for Space Applications |
AUG 2006 |
9 pages |
| Authors:
E. W. Taylor; J. Nichter; F. Nash; F. Haas; A. A. Szep; D. Craig; D. Le; H. R. Fetterman; C. Castaneda; R. Barto; INTERNATIONAL PHOTONICS CONSULTANT ALBUQERQUE NM
|
| Empirical data regarding the radiation induced responses of Mach Zehnder interferometric electro-optic polymer based modulators (PBMs) operating at 1310 and 1550 nm and broadband InP quantum dot (QD) polymer photodetectors (PPDs) operating into the near infrared (NIR) are reported. Modulators composed of spun-on materials and hybrid electostatically self assembled (ESA) and spun-on NLO materials are examined for changes to their half-wave voltage and insertion losses. Pre- and post- irradiation responses ... |
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| Modulation Diversity for Chromatic Dispersion Compensation in Analog Photonic Links |
14 JUL 2006 |
18 pages |
| Authors:
Vincent J. Urick; Frank Bucholtz; NAVAL RESEARCH LAB WASHINGTON DC OPTICAL SCIENCES DIV
|
| We present two solutions for chromatic dispersion compensation in analog photonic links based on modulation diversity. Both concepts are described in theory and demonstrated experimentally. The first, a modulation diversity receiver, on the other hand, is shown to be a completely passive device that adequately compensates for an arbitrary amount of chromatic dispersion in an analog fiber optic link. A band-limited design of the receiver is demonstrated, but essentially any ... |
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| Challenges and Opportunities for Biophotonic Devices in the Liquid State and the Solid State |
JUL 2006 |
4 pages |
| Authors:
A. J. Steckl; J. A. Hagen; Z. Yu; R. A. Jones; W. Li; D. Han; D. Y. Kim; H. Spaeth; J. G. Grote; F. K. Hopkins; CINCINNATI UNIV OH NANOELECTRONICS LAB
|
| In this paper we discuss the unique challenges and opportunities present in using biomaterials in photonics applications. We describe biophotonic materials and devices fabricated and operated in the solid state (fluorescent nanometer thin films, light emitting diodes) and in the liquid state (electrofluidic fluorescent biosensor, microfluidic switches). |
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| Novel Fiber laser Source for Hyper-Sensitive, Long-Range LIDAR System |
18 JUN 2006 |
21 pages |
| Authors:
Kyunghwan Oh; KWANGJU INST OF SCIENCE AND TECHNOLOGY (REPUBLIC OF KOREA) DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| A study of an innovative waveguide structure including hollow optical fiber (HOF) with a central hole and rare earth doped ring core is investigated. The HOGF serves as a novel fiber laser and amplifier gain medium. The central air hole and glass ring core gives an access to chromatic dispersion control, while the rare earth doped ring and its adiabatic taper endows a new degree of freedom to design clad ... |
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| Analysis of Interchannel Crosstalk in a Dispersion-Managed Analog Transmission Link |
JUN 2006 |
7 pages |
| Authors:
Brian S. Marks; Curtis R. Menyuk; Anthony L. Campillo; Frank Bucholtz; MARYLAND UNIV BALTIMORE DEPT OF COMPUTER SCIENCE AND ELECTRICAL ENGINEERING
|
| A technique for computing the effect of cross-phase modulation (XPM) on two co-propagating analog channels in an optical fiber link is presented. In this approach, the interaction between the two channels is linearized by keeping the self-phase modulation (SPM) and XPM interactions in the strong optical carrier components only at lowest order and then at the next order, deriving the effect on the modulation components of both channels when the ... |
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| An Optical Fiber Infrasound Sensor |
JUN 2006 |
19 pages |
| Authors:
Mark A. Zumberge; Jonathan Berger; CALIFORNIA UNIV REGENTS LA JOLLA CA SCRIPPS INST OF OCEANOGRAPHY
|
| We have designed a new type of infrasonic sensor using optical fibers as distributed sensing elements. The design addresses the limitations of the standard pipe filters currently used to average wind-generated, turbulent pressure fluctuations. In addition to maximizing the signal-to-noise ratio, the system has the capability to help estimate signal azimuth and phase velocity. The principal advantage of the Optical Fiber Infrasound Sensor (OFIS) over the standard pipe filter/microbaragraph combination ... |
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| Resonant Photonic Bandgap Nanostructures |
31 MAY 2006 |
17 pages |
| Authors:
Arthur L. Smirl; IOWA UNIV IOWA CITY DIV OF SPONSORED RESEARCH
|
| Here we are expanding our existing program in which we are investigating the creation, control and transport of spin-polarized populations and currents. In addition to extending our previous switch operation to room temperature, this expansion is for the specific purpose of investigating spin-based switching in a new class of materials called resonant photonic bandgap (RPBG) nanostrucures. The proposed expansion will provide for (i) the growth of these nanostructures, (ii) switch ... |
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| High-Power Source of THz Radiation Based on Orientation-Patterned GaAs Pumped by a Fiber Laser |
15-May-2006 |
7 pages |
| Authors:
David Bliss; Candace Lynch; G Imeshev; M E Fermann; K L Vodopyanov; M M Fejer; X Yu; J S Harris; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE
|
| We demonstrate a new source of frequency-tunable THz wave packets based on parametric down-conversion process in orientation-patterned GaAs (OP-GaAs) that produces microW-level THz average powers at the repetition rate of 100 MHz. The OP-GaAs crystal is pumped by a compact all-fiber femtosecond laser operating at the wavelength of 2 microns. Such combination of fiber laser and OP-GaAs technologies promises a practical source of THz radiation which should be suitable for ... |
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| Chip-Scale WDM Devices Using Photonic Crystals |
01 MAY 2006 |
20 pages |
| Authors:
Ali Adibi; GEORGIA TECH RESEARCH CORP ATLANTA
|
| This AFOSR-supported research was aimed at realizing several chip-scale optical devices needed as building blocks for implementing integrated optical systems. To achieve this, we developed several theoretical, fabrication, and characterization tools and procedures for photonic crystals. Some of the main achievements of the previous AFOSR-funded research at the device level are as follows: (1) Photonic crystal waveguides (PCWs) with low loss, large transmission bandwidth, and very low dispersion and distortion ... |
|
| Ultra-Linear Polymer Modulator |
MAY 2006 |
69 pages |
| Authors:
Lou Bintz; Alan Mickelson; LUMERA CORP BOTHELL WA
|
| Polymer electro-optic modulators with applications to photonic link systems requiring high spur free dynamic range are discussed. Multilayer high microbeta electro-optic polymer modulators were designed, fabricated and tested. The linearized designs include three electrode electro-optic modulators, 3dB coupled directional couplers, Mach Zehnder modulators, dual drive modulators. The problem of bias drift is thoroughly discussed. A 3dB coupled directional coupler with increasing separation between arms (splayed) was modeled, fabricated and tested ... |
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| Very Low NF, High DR Heterodyne RF Lightwave Links Using a Simple, Versatile Photonic Integration Technology |
MAY 2006 |
175 pages |
| Authors:
Stephen R. Forrest; PRINCETON UNIV NJ SCHOOL OF ENGINEERING AND APPLIED SCIENCE
|
| The program goals were to demonstrate ultra-low noise RF links, and to demonstrate several key integrated optoelectronic components employing a versatile asymmetric twin waveguide technology. All objectives set forth in the proposal were either met or exceeded. These achievements included: Demonstration of a versatile integration technology based on the asymmetric twin waveguide platform that allowed for the realization of a broad range of components useful in RF photonic components. This ... |
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| Maximizing Optical Power Throughput in Long Fiber Optic Links |
07 APR 2006 |
17 pages |
| Authors:
Anthony L. Campillo; Frank Bucholtz; Keith J. Williams; Patrick F. Knapp; NAVAL RESEARCH LAB WASHINGTON DC OPTICAL SCIENCES DIV
|
| We present an analysis of the design considerations for creating a long, high-bandwidth, and high stimulated Brillouin scattering (SBS) threshold fiber optic link by concatenating lengths of differing fiber types. These considerations are then applied to the constructions of a 20.4-km link. |
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| Photonic Analog-to-Digital Converters |
MAR 2006 |
110 pages |
| Authors:
Rebecca Bussjager; Michael Hayduk; Steven Johns; Michael Fanto; Reinhard Erdmann; Joseph Osman; John Malowicki; David Winter; AIR FORCE RESEARCH LAB ROME NY SENSORS DIRECTORATE
|
| This report addresses the development of photonic analog-to-digital converters (ADCs) based on InP technology, a path that could lead to a fully integrated photonic ADC. The historical background of electronic ADC's is followed by a detailed description of photonic ADC architectures pursued by the SNDP in-house Photonic ADC team. The development and the importance of the key components are also presented, namely lasers, modulators, and quantizers. It was initially anticipated ... |
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| Backward Amplification and Beam Cleanup of a Raman Fiber Laser Oscillator using a Multi-Mode Graded Index Fiber Amplifier |
MAR 2006 |
67 pages |
| Authors:
Jesse D. Morgan; AIR FORCE RESEARCH LAB KIRTLAND AFB NM DIRECTED ENERGY DIRECTORATE
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| This thesis tested a continuos wave (CW) fiber-based Raman amplifier implemented in a backward pumped geometry. To create a seed for the amplifier, a CW Nd:YAG (Neodymium:yttrium-aluminum-garnet) laser operating at 1.064micrometer was used to pump a 50micrometer multimode graded index fiber using fiber Bragg gratings to create a Raman Fiber Laser (RFL) Oscillator with a Stokes beam at 1.116micrometer. The Stokes beam was then used to seed two lengths, 5.3km ... |
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| Passive Multiple Beam Combination in Optical Fibers via Stimulated Brillouin Scattering |
MAR 2006 |
63 pages |
| Authors:
Kirk C. Brown; AIR FORCE RESEARCH LAB KIRTLAND AFB NM DIRECTED ENERGY DIRECTORATE
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| The goal of this research was to demonstrate the feasibility of passively combining multiple laser beams using Stimulated Brillouin Scattering (SBS) in a long multimode optical fiber. This method of combination employed a "Gatling gun" fiber array that allowed several collimated beams to be focused by a lens into an optical fiber. The ability to combine four single-mode off-axis input beams using a fiber array and a long multimode optical ... |
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| Development of a Multiple Beam Combiner Using Stimulated Raman Scattering in Multimode Fiber |
MAR 2006 |
81 pages |
| Authors:
Brian M. Flusche; AIR FORCE RESEARCH LAB KIRTLAND AFB NM DIRECTED ENERGY DIRECTORATE
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| Beam combination was demonstrated by splitting the beam from a Q-switched Nd:YAG (Neodymium:yttrium-aluminum-garnet) laser and pumping a multiple input, single output fiber squid. Beam cleanup of the resulting output beam using stimulated Raman scattering was then demonstrated in both 100 micrometer fiber and 200 micrometer fiber. Energy conversion efficiency into the Stokes beam was measured as a function of input energy and found to be limited by the attenuation characteristics ... |
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Fiber Optics and Integrated Optics
