| The Use of Fiber Bragg Grating Strain Sensors in Laboratory and Field Load Tests: Comparison to Conventional Resistive Strain Gages |
12 NOV 1999 |
13 pages |
| Authors:
Michael Todd; Lex Malsawma; C. C. Chang; Gregg Johnson; NAVAL RESEARCH LAB WASHINGTON DC
|
 | Two tests, one involving a bent beam in the laboratory and one involving tensile testing of a ship hull substructure at Naval Surface Warfare Center/Carderock, were performed where strain readings were compared between conventional resistive strain gages (RSGs) and optical fiber Bragg gratings (FBGs). The closely matched results indicate the utility of FBG strain monitoring systems in the structural health field. |
|
| European Workshop on Optical Fibre Sensors |
04 NOV 1999 |
322 pages |
| Authors:
Brian Culshaw; Julian D. Jones; STRATHCLYDE UNIV GLASGOW (UNITED KINGDOM)
|
| The Final Proceedings for European Workshop on Optical Fibre Sensors, 8 July 1998 - 10 July 1998. This is an interdisciplinary conference. Topics include physical, mechanical, electromagnetic, chemical, environmental, biochemical, and medical sensors; optical fiber gyroscopes; sensor networks; in- fiber gratings and special fibers; and components for sensors, both active and passive. |
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| The Use of Fiber Optic Illumination in Periodontal Therapy |
03 NOV 1999 |
93 pages |
| Authors:
Steven L. Bartel; TEXAS UNIV HEALTH SCIENCE CENTER AT SANANTONIO
|
| Total calculus removal is still the "gold standard" in periodontal therapy. However, the ability to remove all of the calculus from root surfaces is extremely difficult. This is especially true in deep pockets. Surgical access improves our ability to remove more calculus than that removed during a closed procedure, but numerous studies have reported residual calculus despite the use of a surgical approach. Although these studies ... |
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| Amplification by Means of Dysprosium Doped Low Phonon Energy Glass Waveguides |
26 OCT 1999 |
|
| Authors:
Jasbinder Sanghera; Brandon Shaw; Brian Cole; Barry Harbison; Ishwar D. Aggarwal; DEPARTMENT OF THE NAVY WASHINGTON DC
|
 | Disclosed herein is an amplification method, an optical glass amplifier, a laser based on the amplifier and an amplification optical communication system, all based on a limited length of a single-mode glass fiber made from glass having phonon energy of less than about 350/cm and doped with dysprosium. The glass includes 0.1-30 mol % germanium, 0-40 mol % arsenic, 0.02-20 mol % X. 0.01-20 mol % Y, and 0.001-2 weight ... |
|
| A Novel FM Microwave Fiber-Optic Link for Antenna Remoting and Phased Arrays |
05 OCT 1999 |
12 pages |
| Authors:
Guifang Li; UNIVERSITY OF CENTRAL FLORIDA ORLANDO
|
| In this final report, we report the first analysis and experimental demonstration of tunable microwave/millimeter wave signal generation in two section gain coupled DFB lasers. Continuous tuning from 20 to 64 GHz was directly observed and characterized both in the electrical and optical domain. The mechanism of microwave generation in two section gain coupled DFB lasers is different from that of two section index coupled DFB lasers previously reported. As ... |
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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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| Fiber Sensors for Aircraft Health Monitoring |
22 SEP 1999 |
24 pages |
| Authors:
Ignacio Perez; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| The report objectives were to study, develop and transition fiber sensor technologies for aircraft health monitoring, and to develop reliable readout electronics and analysis software. |
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| Compound Core Active Multimore Fiber for High Efficiency Fiber Laser System |
14 SEP 1999 |
|
| Authors:
S. G. Krivoshlykov; ALTAIR CENTER LLC MARLBOROUGH MA
|
| Altair Center proposed to develop a novel and innovative compound- core multimode active fiber for high-efficiency fiber laser systems capable to operate in a single-mode regime. During the Phase I project, the proposed concept was proved by simulating the fiber mode properties. The proposed compound-core fiber is an excellent candidate as a product in several markets, including: fiber lasers, telecommunication, wireless optical communication, electronic ... |
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| Infrared Optical Fiber Coupler |
07 SEP 1999 |
|
| Authors:
David T. Schaafsma; Jasbinder S. Sanghera; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An infrared fiber optic coupler and a method for making an infrared fiber optic coupler are disclosed. The method comprises the steps of: braiding first and second infrared transmitting glass fibers to form first and second arms of the infrared fiber optic coupler; inserting the braided first and second infrared transmitting glass fibers through a furnace; securing the braided glass fibers by two clamping mechanisms on first and second sides ... |
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| Optically Digital Communication and Processing at the Quantum Limit |
SEP 1999 |
22 pages |
| Authors:
Prem Kumar; Horace Yuen; NORTHWESTERN UNIV EVANSTON IL DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| A theoretical/experimental research program was undertaken to settle the fundamental limits of all-optical regeneration, switching, and time recovery, with the aim of quantifying the optimal performance and evaluating how low the signal can be tolerated before amplification/regeneration is necessary. Towards this goal the contractor performed a quantum-mechanical analysis of a nonlinear interferometer that achieves optical switching via cross-phase modulation resulting from the Kerr effect. Northwestern showed how this device performs ... |
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| Wideband Photonics Electric Field Sensor |
SEP 1999 |
32 pages |
| Authors:
S. Sriram; SRICO INC COLUMBUS OH
|
| SRICO developed a wideband photonics electric field sensing system capable of measuring signals up to 18 GHz. The electric field sensor is a passive integrated optic Mach-Zehnder interferometer device. The sensor is made from all-dielectric materials without any electrical connections. |
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| Nonlinear Guided Waves and Their Applications, Topical Meeting Held at Dijon, France on 1-3 September 1999 |
SEP 1999 |
538 pages |
| Authors:
John A. Thomer; OPTICAL SOCIETY OF AMERICA WASHINGTON DC
|
| The general purpose of the meeting was to bring together researchers in all aspects of nonlinear optics in guidewave and self-guided geometries. The meeting covered the range from theory to experiments, and from fundamentals to applications. Development of new ideas and novel techniques in the areas of materials, fabrication, devices, applications, and nonlinear theory were particularly emphasized. This meeting provided a forum for the discussion ... |
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| Hybrid Fiber Bragg Grating/Long Period Fiber Grating Sensor for Strain/Temperature Discrimination |
31 AUG 1999 |
|
| Authors:
Alan D. Kersey; Heather J. Patrick; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A grating sensor system for simultaneously determining strain and temperature is disclosed, which system comprises: a light source for providing a continuous broadband light; a single mode fiber coupled to the light source; a hybrid fiber grating sensor written into the single mode fiber, the sensor comprised of a long period grating having a first center wavelength and first and second fiber Bragg gratings respectively having second and third center ... |
|
| Navy Collaborative Integrated Information Technology Initiative |
30 AUG 1999 |
13 pages |
| Authors:
Kenneth Reifsnider; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Progress report for the NAVCIITI Program for the 8th monthly period of the grant. The long-term objective of this program is to provide strong, integrated research capabilities in broad user communications testbeds, systems engineering, fiber optic sensors and transmission devices, secure and reliable wireless communications, effective user-friendly human computer interfaces, and scientific visualization to the Navy community. This initiative will improve the Navy's capabilities to support distributed computing, integrated services ... |
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| Optical Fiber-Based Corrosion Sensors for Aging Aircraft |
20 AUG 1999 |
11 pages |
| Authors:
Jennifer Elster; Jonathan Greene; Mark Jones; Tim Bailey; William Velander; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| Optical fiber corrosion sensors are being developed to address the high service costs associated with current structural maintenance procedures of civilian and military assets. A distribution optical fiber sensor system will help reduce the costs associated with corrosion damage and extend the lifetime of existing assets. Annual national losses in time, labor, materials, and systems have been estimated in the billions of dollars. Additional costs arise from system downtime that ... |
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| Precision Photonic Readout for Focal Plane Signals |
AUG 1999 |
13 pages |
| Authors:
Geert Wyntjes; Alex Newburgh; Thomas Hudson; VISIDYNE INC BURLINGTON MA
|
| We will present the development of a remote Precision Photonic Readout for Focal Plane Array Detectors. Its underlying principles, design and tests as well as limitations will be discussed. The design, in essence, constitutes a remote, via fiber optics, analog-to-digital converter, where the low level focal plane signals are encoded as differential optical phase shifts. These phase shifts are then recovered as digital numbers at a location external to the ... |
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| Strain Monitoring During Construction of a Steel Box-Girder Bridge with Arrays of FIber Bragg Grating Sensors |
30 JUL 1999 |
51 pages |
| Authors:
Sandeep T. Vohra; Gregg A. Johnson; Michael D. Todd; Bruce Danver; Bryan Althouse; NAVAL RESEARCH LAB WASHINGTON DC OPTICAL TECHNIQUES BRANCH
|
| Field performance of arrays of wavelength division multiplexed (WDM) fiber Bragg grating strain sensors is presented. Data from two field tests, carried out in February 1998 and October 1998 on an in-construction box-girder bridge, are presented and compared to data obtained from arrays of conventional sensors, where possible. The results in this report represent one of the first extensive tests of WDM Bragg grating sensor arrays on real world infrastructure. ... |
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| Nonlinear Dynamics of Coupled Laser Systems |
27 JUL 1999 |
102 pages |
| Authors:
Rajarshi Roy; GEORGIA INST OF TECH ATLANTA SCHOOL OFPHYSICS
|
| This final technical report summarizes the results of research supported by the Office of Naval Research from October 1, 1995 to March 31, 1999, at the School of Physics, Georgia Institute of Technology. The research has encompassed a broader range of topics than was originally in the original proposal. The topics investigated were as follows. (a) Dynamics of coupled laser systems and arrays. (b) Wave propagation in nonlinear media and ... |
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| Fiber Optic Hydrophone Array |
27 JUL 1999 |
|
| Authors:
Louis E. Sansone; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A fiber optic hydrophone array is provided in which a plurality of tubes, e.g., fiber optic hydrophones, are to be secured about an elongate elastomeric member having a diameter that hinders each tube from being slid thereover. Each time a tube is to be positioned and secured, longitudinal tension is applied to the elongate elastomeric member to form a reduced cross section along its length in order to facilitate the ... |
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| System and Method for Recovering a Signal of Interest from a Phase Modulated Signal Using Quadrature Sampling |
13 JUL 1999 |
|
| Authors:
Gerald L. Assard; Antonio L. Deuss III; Barry A. Blakely; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A digital receiver system is used to recover a signal of interest, such as a measurand signal, from a phase modulated signal detected from a system utilizing quadrature carriers, such as a fiber optic interferometer sensor system. The digital receiver system includes a quadrature sampling demodulator that sampling the phase modulated signal by using quadrature sampling periods to recover the odd and even components of the signal of interest. The ... |
|
| 3-D Cryo-Cooled Multi-Chip Modules via Optical Interconnects |
JUL 1999 |
11 pages |
| Authors:
Len Schaper; ARKANSAS UNIV FAYETTEVILLE DEPT OF ELECTRICAL ENGINEERING
|
| This report discusses the investigation , both theoretically and experimentally, of the formation of optical waveguides as optical interconnects in the semiconductor InP. A dark soliton was also investigated and demonstrated to also act as a waveguide and guide a second beam. These waveguides and their interaction offer exciting possibilities for use as optical interconnects in multi- chip modules. |
|
| Wavelength Multiplexed Electro-Optically Controllable, Fiber Optic Multi-Tap Delay Line |
29 JUN 1999 |
7 pages |
| Authors:
William K. Burns; Lesli E. Chipman; Robert P. Moeller; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The wavelength multiplexed, electro-optically controllable, fiber optic multi-tap delay line utilizes a first output signal from a plurality of amplitude adjustable continuous-wave (CW) optical lasers multiplexed to form a combined optical signal onto which a radio frequency signal is imposed thereby shifting the combined optical signal which is then demultiplexed. A second output signal of the plurality of CW lasers is phase adjusted and combined with the demultiplexed combined optical ... |
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| Fiber Optic Handling and Coating Fixture |
22 JUN 1999 |
|
| Authors:
Scott L. Patton; Robert M. Payton; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The invention comprises a fixture and method for holding optical waveguides, such as fiber optic cable, in a relatively stable fashion for processing. The fixture includes a first frame and a second frame, releasably securable to the first frame to form a unitary structure. Chambers disposer in at least one of the frames are adapted for removably receiving optical fiber cable when the first and second frames are released from ... |
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| Fiber Optic Chameleonic Skin |
12 JUN 1999 |
35 pages |
| Authors:
Michael L. Myrick; SOUTH CAROLINA UNIV COLUMBIA DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| The purpose of this project has been to investigate fiber-optic array methods for creating and/or recording spectroscopic image information, plus rapidly manipulating this optical content for applications in optical camouflage. Our major investigations during this program have been for the creation of specialized dimension-transformation fiber-optic arrays and the development of techniques for interpreting multidimensional spectroscopic images (2-D and 3-D). |
|
| International Workshop on Laser and Fiber-Optic Network Modelling |
25 MAY 1999 |
35 pages |
| Authors:
AKADEMIYA NAUK URSR KHARKOV INST OF RADIOPHYSICS AND ELECTRONICS
|
| The Final Proceedings for International Workshop on Laser and Fiber- Optic Network Modeling, 25 May 1999 - 25 May 1999. This is an interdisciplinary conference. Topics include solid-state physics, semiconductor physics, fiber- optics components and networks, nonlinear effects in active and passive optical devices, dispersive media and beam propagation in optical waveguides, modelling of physical processes in semiconductor, solid-state, and gas lasers, new coherent optical sources for the systems of ... |
|
| Assembly and Method for Furcating Optical Fibers |
14 MAY 1999 |
16 pages |
| Authors:
xcGair D. Brown; Yancy T. Jeleniewski; Robert A. Throm; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An assembly that includes a fiber-containing structure that contains a plurality of optical fibers and a furcation tube assembly that includes a plurality of loose tube optical fiber cables. Each of the loose tube optical fiber cables includes a hollow inner tube; a support structure that includes strength members, the support structure surrounding the hollow inner tube; and, a protective jacket surrounding the support structure. The assembly further includes a ... |
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| Fiber Optic Cable Furcation Unit |
11 MAY 1999 |
|
| Authors:
Gair D. Brown; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A low cost rugged sealed fiber optic cable furcation unit is provided. The furcation unit has an outer heat shrink tube which encloses a protective tube. Within the protective tube a spacer/fiber guide is located along with a sealant material. When installed and sealed, the seated furcation unit includes% fiber ends and cables. The furcation unit allows loose tube fiber optic cables or tube ducts within Air Blown Fiber (ABF) ... |
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| Fiber Optic Accelerometer Sensor and a Method of Constructing Same |
11 MAY 1999 |
|
| Authors:
Sandeep T. Vohra; Bruce Danver; Alan Tveten; Anthony Dandridge; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The interferometric fiber optic accelerometer is viewed as a mass spring transducer housed in a sensor case. The sensor case is attached to a moving part whose motion is inferred from the relative motion between the mass and the sensor case. A flexural disk is housed in a sensor case which is accelerated in a direction normal to the plate surface. The plate undergoes displacement resulting in strains on the ... |
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| Independent Control of One of Normally Interdependent Light Transmission Characteristics of Optical Fiber |
11 MAY 1999 |
|
| Authors:
Robert M. Payton; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A method and apparatus for controlling polarization, as one of a pair of interdependent light characteristics of an optical fiber, in response to a time dependent signal without the introduction of any significant variation in phase delay. A pair of transducers compress the optical fiber at spaced locations. When phase of energization of a first transducer in response to the time dependent signal is 180 deg out of phase with ... |
|
| Multi-Cylinder Apparatus for Making Optical Fibers, Process and Product |
04 MAY 1999 |
|
| Authors:
Reza Mossadegh; Jasbinder Sanghera; Ishwar Aggarwal; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A vertically disposed apparatus used to make core-clad optical fibers includes an inner elongated cylinder removably closed at the top and provided at the bottom with an inner exit port of a smaller diameter than the inner cylinder and an outer cylinder, disposed around the inner cylinder removably closed at the top and provided at the bottom with an outer exit port of a smaller diameter than the outer cylinder. ... |
|
| Optical Gyros and their Application (Gyroscopes Optiques et leurs Applications) |
MAY 1999 |
|
| Authors:
D. Loukianov; R. Rodloff; H. Sorg; B. Stieler; NATO RESEARCH AND TECHNOLOGY ORGANIZATION NEUILLY-SUR-SEINE (FRANCE)
|
| This AGARDograph is written by experts from France, Germany, Russia and the United States. Only the radical change of the political and military situation within the last decade made it possible to have the subject Optical Gyros covered by scientists and engineers from East and West. Until this change, Optical Gyros and their research and development were mostly handled as top secret. The more it can be seen as a ... |
|
| Fiber Optic Cable Furcation Unit. |
06 APR 1999 |
12 pages |
| Authors:
Gair D. Brown; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A low cost rugged sealed fiber optic cable furcation unit is provided. The furcation unit has an outer heat shrink tube which encloses a protective tube. Within the protective tube, a spacer/fiber guide is located along with a sealant material. When installed and sealed, the sealed furcation unit includes fiber ends and cables. The furcation unit allows loose tube fiber optic cables or tube ducts within Air Blown Fiber (ABF) ... |
|
| Radio Frequency Cable to Optical Fiber Cable Converter/Interface |
06 APR 1999 |
|
| Authors:
Harold S. Rolls; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A bidirectional converter/interface for connecting several two way broadband RF cables to a single pair of optical fibers is provided. In the reception mode, a broadband RF carrier of an optical conductor signal is directed to a plurality of bandpass filter/block converter combinations. These filter/converter combinations segment the broadband RF carrier into predetermined RF bands carrying the information. Each segmented band is then shifted (either up or down) to the ... |
|
| Data Transmission Over Fiber Optics Using High Performance Network Protocol |
APR 1999 |
4 pages |
| Authors:
John Drummond; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
|
| The application of multimedia transmission has as one of its predominate components network communications. In this paper the author has endeavored to implement and analyze network communication of multimedia information. In this analysis Xpress Transfer Protocol (XTP) and Fiber Distributed Data Interface (FDDI) protocol have been utilized. FDDI is an implementation of the ISO standard for Open Systems Interconnect (OSI) Reference Model Data-Link and Physical ... |
|
| Physiographic Personnel Monitor |
19 MAR 1999 |
|
| Authors:
Martin C. Baruch; EMPIRICAL TECHNOLOGIES CORP CHARLOTTESVILLE VA
|
| The objective of this program was to produce a working prototype of a wrist sensor that would monitor and record the pulse signal available at the radial artery, analyze it to extract the heartbeat and respiration rate on receipt of a radio frequency (RF) signal, and transmit the results via an (RF) link over a short distance. |
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| Demodulation System and Method for Recovering a Signal of Interest from an Undersampled Modulated Carrier |
16 MAR 1999 |
|
| Authors:
Gerald L. Assard; Antonio L. Deus III; Barry A. Blakely; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A demodulation system and method is used in a sensor system such as a fiber optic sensor system, that senses optical signals and modulates a phase generated carrier having a carrier frequency Wc to form a modulated carrier. The modulated carrier is preferably undersampled at three times the carrier frequency (3Wc), thereby maximizing the sensors' demodulated bandwidth relative to the sensors sampling frequency. The undersampled modulated carrier is orthogonally demodulated ... |
|
| Process for Making Optical Fibers from Core and Cladding Glass Rods |
09 MAR 1999 |
|
| Authors:
Jasbinger S. Sanghera; Pablo Pureza; Ishwar D. Aggarwal; Reza Mossadegh; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A core/clad glass optical fiber is made by melting a core glass rod and a cladding glass rod in separate crucibles which are not intersecting with respect to each other and the respective core and cladding glass melts passed out of contact with each other to a glass melt contacting zone proximate a fiber drawing orifice in which the cladding glass surrounds the core glass and a core/clad glass fiber ... |
|
| Laser Beam Combining and Cleanup via Stimulated Brillouin Scattering in Multi-mode Optical Fibers |
MAR 1999 |
92 pages |
| Authors:
Blake C. Rodgers; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The main objective of this thesis was to demonstrate the feasibility of combining and cleaning up multiple laser beams via Stimulated Brillouin Scattering (SBS) in a multi-mode optical fiber. Beam combining via SBS in an optical fiber is of interest because of the low SBS threshold power in an optical fiber allowing low power diode laser beams to be combined into one high power beam. ... |
|
| Fabrication of Ultrastrong Fiber Bragg Gratings Through the Polymer Coating |
28 FEB 1999 |
19 pages |
| Authors:
J. Feinberg; D. S. Starodubov; V. Grubsky; D-STAR TECHNOLOGIES INC MANHATTAN BEACH CA
|
| D-STAR Technologies, Inc. has developed a technique for writing gratings through the polymer coating of commercially available optical fibers. In this Phase I project we discovered how to make our gratings thermally stable without destroying their polymer coating. This last discovery is an exciting breakthrough, for without it D-STAR's gratings would not have been commercially attractive. D-STAR now has the ability to both write and anneal gratings withoutremoving their polymer ... |
|
| D-Optical Fiber and Cladding Pumped Optical Fiber Lasers |
FEB 1999 |
26 pages |
| Authors:
T. F. Morse; BROWN UNIV PROVIDENCE RI
|
| This final report presents information in research relating to co- doping of potential cladding pumped optical fibers. The emphasis is on experiments conducted that permitted the comparison of a series of co-doped optical fiber preforms made using an aerosol deposition process developed at Brown University. A set-up was developed that uses ASE (Amplified Spontaneous Emission) as a vehicle by which the relative efficiencies of a ... |
|
| Methods and Components for Optical Contention Resolution in High Speed Networks |
FEB 1999 |
5 pages |
| Authors:
Imrich Chlamtac; TEXAS UNIV AT DALLAS
|
| This project dealt with designing all-optical packet switched networks. To avoid the electronic bottleneck in LAN and MAN topologies this project develops and demonstrates a novel optoelectronic receiver front end consisting of optical delay lines and fast optical switches. The proposed approach combines the advantages of optics and electronics in a Switched-Delay- Line Contention-Resolution-Optics (SDL-CRO) to optically store and switch packets. The resulting SDL-CRO ... |
|
| Reconfigurable Network Routing with Spatial Soliton Crossbar Switches |
31 JAN 1999 |
20 pages |
| Authors:
George I. Stegeman; Michael Canva; Russell Fuerst; Roman Malendevich; Lars Friedrich; UNIVERSITY OF CENTRAL FLORIDA ORLANDO
|
| The ultimate goal of this program was to use spatial solitons as reconfigurable interconnects for guiding signals between multiple input and output ports. The central idea is to use the solitons as a waveguide for guiding signals. Deflecting the soliton electro-optically allows the soliton (and hence the signal) to be steered in space. The research goals were to: (1) Steer solitons electro-optically in AlGaAs slab waveguides; ... |
|
| Tunable Wavelength Based Photonic Architectures for the Dynamic Control of Phased Array Antennas |
JAN 1999 |
35 pages |
| Authors:
Henry Zmuda; FLORIDA UNIV GAINESVILLE DIV OF SPONSORED RESEARCH
|
| This report examines three novel photonic systems for controlling broadband phased array antennas. These photonic systems take advantage of recent advances in fiber Bragg gratings, high dispersion optical fiber and tunable wavelength laser technologies. The first system is a transmit/receive beamformer that uses fiber gratings arranged in a prism-like configuration. A proof-of- concept breadboard for controlling a three-element phased array antenna demonstrated high-resolution beamsteering over a 3.5 GHz bandwidth. Based ... |
|
| Novel Fibers and Photonic Devices |
31 DEC 1998 |
10 pages |
| Authors:
T. F. Morse; BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
|
| We were able to show that by doping a silica fiber with Nd and Er ions, and by simultaneously pumping with 800 nm radiation (to invert the Nd ions) and with 980 nm radiation (to invert the Er ions) it was possible to obtain lasing at both 1060 nm and 1537 nm. |
|
| Method and Apparatus for Side Pumping an Optical Fiber |
29 DEC 1998 |
|
| Authors:
Lew Goldberg; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The invention pertains to a technique for the efficient coupling of pump light into a fiber by injecting the light through the side of a fiber leaving the fiber ends accessible to input and output coupling. This technique relies on the fabrication of a groove or a microprism into the side of the fiber. The groove shape is adapted effective to the variables of light wavelength, orientation of the source ... |
|
| Integrated Fiber Optic Strain Sensing Using Low-Coherence Wavelength-Encoded Addressing |
26 DEC 1998 |
36 pages |
| Authors:
Ralph Posey Jr; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A system is disclosed for measuring strain using a technique of detecting the optical path difference in a sensing interferometer using an interrogating interferometer including a chirped fiber Bragg grating in which the optical path difference in the sensing interferometer is changed with the strain in the sensing arm, whereas the optical path difference of the interrogating interferometer is changed only by changing the center wavelength of addressing light, making ... |
|
| Integrated Optoelectronic Switching Technology for Fiber-Optic Communications Networks |
23 DEC 1998 |
40 pages |
| Authors:
Regis Fan; R. Brian Hooker; COLORADO UNIV AT BOULDER
|
| Optical switching can be performed by using optical amplifiers combined with a passive waveguiding network. Recently. most of the effort in optical amplifier switch modules have been focused on monolithic switches in which the entire device is fabricated on an InP substrate together with the semiconductor optical amplifiers (SOAs). In this paper, we investigate the use of SOAs with passive polymer waveguides to make hybrid switches of varying sizes. The ... |
|
| Photonically Generated True Time Delay for Phased Array Applications |
DEC 1998 |
50 pages |
| Authors:
Paul M. Payson; Henry Zmuda; Edward N. Toughlian; Richard A. Soref; Herbert W. Klumpe III; AIR FORCE RESEARCH LAB ROME NY SENSORSDIRECTORATE
|
| Several relatively new photonic components have recently come to the forefront in applications related to the photonic processing of broadband microwave signals. Included in this set of photonic elements are the wavelength tunable laser, high dispersion optical fiber, and the Bragg reflection grating. These components hold the promise of revolutionizing the field of broadband photonic processing. This report documents the performance characteristics of these components and shows how they can ... |
|
| Amplitude Modulation Using a Nonlinear Optical Loop Mirror |
DEC 1998 |
58 pages |
| Authors:
David S. Grennek; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The nonlinear optical loop mirror (NOLM) configuration has been studied extensively within the context of pulsed and/or quasi-CW laser sources. As such, the NOLM holds great promise in the areas of soliton switching, pulse compression and high data rate communications. However, comparatively little research has been done with CW sources. In this investigation, the theoretical properties of the NOLM are explored experimentally with the aid of a CW Nd:YAG laser ... |
|
| JPRS Report, Science & Technology, China |
02 NOV 1998 |
|
| Authors:
JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA
|
| This China Report contains articles on Science and Technology. The main topics are Applied Sciences, Environmental Quality, Life Sciences and National Developments. |
|
Fiber Optics and Integrated Optics
