| Fiber Optic Bragg Gratings |
NOV 1998 |
73 pages |
| Authors:
James M. Battiato; Kent E. Hulick; AIR FORCE RESEARCH LAB ROME NY
|
 | Coupled mode theory was used to model reflection fiber gratings. The effects of experimental parameters on grating characteristics were modeled for both uniform and non-uniform grating profiles using this approach. Fabrication of gratings in standard communication single mode fiber required an enhancement of the fiber's photosensitivity by way of high-pressure hydrogen treatment. The theory behind this technique as well as the experimental system used to treat the fibers was discussed. ... |
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| Fiber Bragg Grating Interrogation System With Adaptive Calibration |
06 OCT 1998 |
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| Authors:
Michael A. Davis; Alan D. Kersey; David G. Bellemore; DEPARTMENT OF THE NAVY WASHINGTON DC
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 | The invention pertains to a system and method for providing accurate measurements of the reflected wavelengths from multiple strings of fiber Bragg grating (FBG) elements using a single scanning optical filter and an isolated duplicate reference string of FBG elements. A reference string of FBG elements permits precise long-term wavelength determination of sensors by providing real-time adaptive calibration adjustments to correct for any nonlinearities in the response of the single ... |
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| Flight Synchronization |
05 OCT 1998 |
2 pages |
| Authors:
Jon Sauer; Harry Jordan; COLORADO UNIV AT BOULDER OPTOELECTRONICCOMPUTING SYSTEMS CENTER
|
| The goal of the research is to better use the high bandwidth potential of optical fiber by accomplishing the usually electronics based functions of input, output, regeneration, noise suppression, and synchronization in optics. A simple system that exhibits these features is an optical buffer or "memory". The memory supports insertion and readout of full packets by means of a gap between packets. Amplification is done using ... |
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| Research on High Resolution Imaging and Fiber Optical Networks |
OCT 1998 |
19 pages |
| Authors:
James F. Young; RICE UNIV HOUSTON TX DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The purpose of this grant was to provide support to allow a student working under the preceding grant, F49620-94-1-0017 to transition to new funding and to finish his graduate degree. Both objectives were met. The research program involved two projects. The first focused on the development of extreme ultraviolet (XUV) sources, and their application to the development of high resolution, microscopic imaging techniques. That project came ... |
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| Integrated Photonics Research. 1998 Technical Digest Series. Volume 4 |
OCT 1998 |
471 pages |
| Authors:
Fantone; OPTICAL SOCIETY OF AMERICA WASHINGTON DC
|
| The topical meetings technical program and the list of attendees demonstrates the international scope of the present effort in this technology. Finally, are pleased to thank the following organizations for their generous financial support of the meeting. |
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| High Bandwidth Optical Switching Technology for Optical Fiber Communication |
21 SEP 1998 |
39 pages |
| Authors:
Ravinder Kachru; SRI INTERNATIONAL MENLO PARK CA
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| While fiber optic technology has the intrinsic high bandwidth for the backbone transmission required of a high speed communications network, the creation of the high bandwidth network to users remains a challenge. The main impediment thus far to the development of a high speed optical network has been the absence of the following key technologies: (1) a high speed optical memory, (2) optical header recognition, (3) ... |
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| A.S.E. Source at 1550nm for IFOG Applications |
15 SEP 1998 |
7 pages |
| Authors:
Anand Gopinath; Benjamin Ellerbusch; William Berglund; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Work has progressed in the testing and characterization of Erbium and Ytterbium doped waveguides. Areas for improvement have been identified and include reducing waveguide and coupling losses as well as increasing ASE output power and gain. Several steps, including a new waveguide structure, have been taken to improve performance in each of these areas and initial lifetime measurements done with the new guide structure show that ... |
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| Optical Fibers With High Acceleration Sensitivity and Low Pressure Sensitivity |
08 SEP 1998 |
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| Authors:
Nicholas Lagakos; Joseph A. Bucaro; DEPARTMENT OF THE NAVY WASHINGTON DC
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| An optical fiber which includes a light transmitting center portion, a protecting layer and a stress preventing layer. The protecting layer concentrically surrounds the center portion, and reduces the effect of environmental factors on the center portion. The stress preventing layer concentrically surrounds the center portion and is positioned between the protecting layer and the center portion. The stress preventing layer has a Young's Modulus substantially lower than the Young's ... |
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| Extended Abstracts, 11th International Symposium on Non-Oxide & New Optical Glasses, 6-10 September 1998, Sheffield, UK |
SEP 1998 |
598 pages |
| Authors:
SHEFFIELD UNIV (UNITED KINGDOM)
|
| The 11th International Symposium, formerly known as the International Symposium on Non-Oxide Glasses, and held about every two years since 1981, is the premier conference for discussion of the latest developments in synthesis, structure, properties, processing and applications of non-oxide glasses and new optical glasses. An important objective of the Symposium is to bridge the gap between scientific understanding and technical requirements so that the enormous future potential of special ... |
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| 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 ... |
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| DURIP 98-99 Optical Fiber Gratings Using UV Light |
31 AUG 1998 |
3 pages |
| Authors:
Jack Feinberg; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF PHYSICS
|
| This is an "equipment only" grant under the Defense University Research Instrumentation Program. A report of the results obtained with this equipment is contained in the reports for Grant F49620-98-1-0051, "OPTICAL FIBER GRATINGS USING NEAR-UV LIGHT". |
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| POTDR Measurements on Buried Optical Fibers |
14 AUG 1998 |
22 pages |
| Authors:
Kent B. Hill; Carl A. Villarruel; NAVAL RESEARCH LAB WASHINGTON DC ADVANCED CONCEPTS BRANCH
|
| In this report, a polarization-sensitive optical time domain reflectometer (POTDR) is described and results of POTDR measurements on buried optical fibers in a network testbed are presented. The polarization effects observed on different fibers in the testbed show that the birefringence may vary significantly in fibers of the same type and the same cable. Measurements taken over several hours indicate that polarization effects in buried optical ... |
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| Tunable Lasers for Investigation of Fiber Optic Devices, 1997 DURIP program |
AUG 1998 |
9 pages |
| Authors:
P. D. Dapkus; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES
|
| Equipment to support research into novel fiber optic devices has been acquired. Tunable lasers near 1.3 microns and 1.55 microns and a polarization controller to characterize the functionality of Microoptical devices and circuits based on Microresonators were purchased and inserted into a comprehensive guided wave device test system. The 1.3 microns laser was donated by SDL, Inc. And was offered as a cost share to the ... |
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| Fiber-Optic Pipette (FOP) for Rapid Long Pathlength Capillary Spectroscopy. |
30 JUL 1998 |
13 pages |
| Authors:
Christopher Stellman; Frank Bucholtz; Kenneth Ewing; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| Capillary spectroscopy is frequently used in the analysis of small-volume liquid samples. Traditionally, optical spectroscopy of samples in capillary tubes has been achieved by using simple lenses to excite the sample and collect the resulting signal of interest, Figure la. More recently, these standard optical arrangements have been replaced with fiber-optics, Figure 1b. Coupling of a fiber-optic probe to the end of a capillary tube has provided a much simpler ... |
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| Continuous Fiber Pulse Reflecting Means |
28 JUL 1998 |
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| Authors:
Gregory H. Ames; Jeffrey C. Gremillion; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A device for providing a controlled back-reflection of a preselected portion of incident fiber-guided light while minimizing the affect to light continuing down the fiber. The back-reflected light couples to the reverse traveling fiber mode with minimal loss. These devices are used as reflectors in a pulse sampled fiber optic hydrophone array. |
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| Pulse Excited Fiber Gyro |
21 JUL 1998 |
17 pages |
| Authors:
Hermann Haus; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| The goal of the research was to study the operation of pulse excited gyros. This objective required several innovations: (1) Conventional gyros are excited cw with radiation of short coherence time. The gyro must be pulse- excited. The reason for pulse excitation derives from the ultimate objective of using squeezed radiation for the improvement of gyro performance. Squeezing requires pulse excitation of high peak intensity. ... |
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| Process for Removing Hydrogen and Carbon Impurities from Glasses by Adding a Tellurium Halide |
14 JUL 1998 |
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| Authors:
Jasbinder S. Sanghera; Vinh Q. Nguyen; Ishwar D. Aggarwal; DEPARTMENT OF THE NAVY WASHINGTON DC
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| Hydrogen and/or carbon impurities are removed from chalcogenide or chalcohalide glasses by the addition of a halide, such as TeCl4, to the batch composition. During melting of the batch composition, the metal halide reacts with the hydrogen and/or carbon impurities to form a hydrogen halide and/or carbon tetrahalide gas and a metal which becomes incorporated into the chalcogen-based glass. Useful halides include halides of sulfur, selenium, tellurium, polonium, or halides ... |
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| Preliminary Results on the Monitoring of an In-Service Bridge Using a 32-Channel Fiber Bragg Grating Sensor System |
10 JUL 1998 |
24 pages |
| Authors:
S. T. Vohra; C. C. Chang; B. Alhouse; B. A. Danver; M. A. Davis; NAVAL RESEARCH LAB WASHINGTON DC OPTICAL TECHNIQUES BRANCH
|
| This report describes the preliminary results of the performance of a 32-channel fiber Bragg grating (FBG) system used to monitor the dynamic response of an in-service interstate bridge (North-bound span, 1-10 at University Blvd., Las Cruces, New Mexico). Fiber Bragg grating sensors were attached on four different support girders in groups of three at various locations along the span of the bridge. Using an interrogation approach based on ... |
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| Optical Fiber Terminations |
07 JUL 1998 |
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| Authors:
Lynda E. Busse; Frederic H. Kung; Jasbinder S. Sanghera; Ishwar D. Aggarwal; DEPARTMENT OF THE NAVY WASHINGTON DC
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| An optical fiber termination connector includes an elongated structure with a chamber extending therethrough open at both ends, a fiber disposed in the chamber and spaced therefrom, a solid first material disposed in the chamber around the fiber, and an air gap in the chamber around the end of the fiber. The process includes the steps of locating a fiber in a chamber disposed vertically, with the end of the ... |
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| Pulse Generation and Propagation in Optical Fibers: Experiments and Simulation |
JUL 1998 |
53 pages |
| Authors:
Joseph W. Haus; Walter Kaechele; Gary Shaulov; RENSSELAER POLYTECHNIC INST TROY NY
|
| Properties of active and passive mode-locked fiber lasers were examined. The experimental lasers displayed stable picosecond pulse generation and the noise in each mode-locked fiber laser was carefully characterized. The project included computational and analytical calculations and coordination of theoretical efforts with experimental efforts at the Photonics Center. Physical aspects of the cavity design were considered to help understand the operation of our fiber lasers. ... |
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| Fluorescence Optic Fiber Stereotactic Needle Ratiometer for Breast Tumor Diagnosis |
JUL 1998 |
57 pages |
| Authors:
Guichen Tang; Alvin Katz; Robert Alfano; MEDISCIENCE TECHNOLOGY CORP CHERRY HILLNJ
|
| A optical fiber needle based CD-ratiometer using native spectroscopic differences between diseased and normal tissues, has been designed, assembled, and tested for real time evaluation and diagnosis of breast tumor in vivo. A key point of the research project is using an optical fiber needle as a probe to deliver the excitation light to a tumor and collect the fluorescence from that region. The probe, with a small diameter of ... |
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| Optical Pulse Coding for Maximum Data Rate |
20 JUN 1998 |
219 pages |
| Authors:
Terence W. Barrett; BSEI VIENNA VA
|
| This study shows the benefit of a two stage hierarchy of coding schemes for achieving maximum data rate transmission in optical fiber communications. A first matched filter identifies the code/microchannel orthogonal code and a second matched filter identifies the data either BPSQ'd or pulse position modulated with error correction. The novel achievements of this study are: (1) the introduction of group theory (Young frame and tableaux methods) in characterizing code ... |
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| Limited Rotation Connection Device |
09 JUN 1998 |
7 pages |
| Authors:
Randall W. Ball; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A limited rotation connection device includes a housing defining a central hole extending therethrough and a central shaft extending through the central hole of the housing and being rotatably mounted to the housing, the housing also defining an annular slot surrounding and extending in substantially perpendicular relation to the central shaft. The device also includes an elongated flexible communication element disposed in the annular slot of the housing and having ... |
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| Spectral Methods for High-Speed Optical Transmultiplexing and Coding |
02 JUN 1998 |
9 pages |
| Authors:
Andrew M. Weiner; PURDUE RESEARCH FOUNDATION LAFAYETTE IN
|
| This program is demonstrated all-optical methods for generation, processing, and transmultiplexing (data format conversion) of ultrafast lightwave signals. This work is based on a generalized space-time processing concept, where ultrafast time-domain signals are converted into the spatial domain, where they can be processed using parallel optical and smart pixel optoelectronic techniques, and then subsequently reconverted back into the ultrafast time domain. The program investigated GaAs/GaAlAs photorefractive quantum wells as a ... |
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| Performance Enhancement in Optical Computing |
JUN 1998 |
108 pages |
| Authors:
John F. Walkup; Thomas F. Krile; TEXAS TECH UNIV LUBBOCK DEPT OF ELECTRICAL ENGINEERING
|
| The major objectives of this research effort were (1) to develop mult-level, multi-error-correcting codes suitable for both the binary and non- binary operation of optical matrix-vector multipliers including efficient decoding techniques, and (2) to investigate accuracy issues associated with optical memory technologies, including photon echoes, and multiplexed holography. |
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| A.S.E. Source at 1550nm for IFOG Application |
JUN 1998 |
4 pages |
| Authors:
Anand Gopinath; Benjamin Ellerbusch; William Berglund; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The report summarizes the results of loss measurements of the undoped alumina waveguides for both the 1550nm and 980nm wavelengths. |
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| Methods and apparatus for Distributed Optical Fiber Sensing of Strain or Multiple Parameters |
26 MAY 1998 |
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| Authors:
Alan D. Kersey; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A distributed optical fiber sensor system including a patterned array of weakly reflecting broadband gratings or other sensors serially disposed along a common fiber. The laser sources are multiplexed onto the fiber and are propagated through a directional coupler toward the sensors. The return signals are directed by the directional coupler to a demultiplexer that separates the signals by center frequencies and sends each to a respective detector. All reflection ... |
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| High Performance Graded Index Polymer Optical Fibers |
11 MAY 1998 |
81 pages |
| Authors:
Anthony F. Garito; PENNSYLVANIA UNIV PHILADELPHIA DEPT OFPHYSICS AND ASTRONOMY
|
| Experimental and theoretical studies of the optical properties of large core step index (SI) plastic optical fibers (POF) and graded index (GI) POFs are reported. A set of criteria and analyses of physical parameters are developed in context to the major issues of POF applications in short-distance communication systems. Analyses are presented to show how the measured POF optical attenuation affects the overall performance in wavelength division multiplexing (WDM) and ... |
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| Signal Processing for Optical Networks |
01 MAY 1998 |
34 pages |
| Authors:
Dennis M. Healy Jr; DARTMOUTH COLL HANOVER NH
|
| In this report, we present a summary of research and transitions performed in the context of our study of the application of advanced signal processing concepts and techniques to various issues associated with optical fiber communication systems. We describe theoretical, simulation, and experimental studies of novel lightwave communication schemes and protocols addressed to challenges posed by extremely fast signaling rates, nonlinearities, dispersion, and attenuation. We describe analysis and design of ... |
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| Multi-kilowatt Peak Power Transmission through Infrared Fibers in the 3 - 5 mm Region |
MAY 1998 |
11 pages |
| Authors:
L. E. Busse; J. S. Sanghera; I. D. Aggarwal; B. Carbonaro; M. P. Tarr; NAVAL RESEARCH LAB WASHINGTON DC
|
| We have demonstrated high power transmission through selected chalcogenide glass clad fibers using an Optical Parametric Oscillator (OPO) with output in the 3 - 5 mm wavelength region. These results show great promise for implementing these fibers to connect the laser to the Jam Head in IR countermeasures systems. The maximum peak power used was 26.9 kW and the peak power density at the focus into the fiber was 1.07 ... |
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| Fiber Optic Infrared Cone Penetrometer System |
14 APR 1998 |
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| Authors:
Frank Bucholtz; Gregory Nau; Ishwar D. Aggarwal; Jasbinger S. Sanghera; Kenneth J. Ewing; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A system for the in-situ detection of chemicals, including water, in soil comprises: (1) a penetrometer for penetrating the soil, the penetrometer including interior and exterior surfaces, and a window for allowing infrared radiation to be transmitted between the interior and exterior surfaces of the penetrometer; (2) a driver for driving the penetrometer into the soil to a plurality of different depths; (3) a source for providing infrared radiation which ... |
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| Active Materials for Photonic Systems (AMPS) |
13 APR 1998 |
79 pages |
| Authors:
Lawrence E. Pado; John Haake; Herb Smith; BOEING AEROSPACE CO ST LOUIS MO
|
| The AMPS program has created the first 3-axis MEMS active fiber optic micro-aligner, which will allow for in-package alignment or fiber optic and microoptic components. The micro-aligner is a wafer level fabricated device, based on a combination of silicon micromachining and LIGA technology. The electrically controllable actuators demonstrate the high force and displacement necessary to overcome fiber optic cable, counterforce springs, friction, and wirebonds to perform in-package alignment of a ... |
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| Method for Producing Core/Clad Glass Optical Fiber Preforms Using Hot Isostatic Pressing |
07 APR 1998 |
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| Authors:
Jasbinder Sanghera; Pablo Pureza; Ishwar Aggarwal; Robert Miklos; DEPARTMENT OF THE NAVY WASHINGTON DC
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| Core/clad glass optical fiber preforms free of bubbles and soot at the core/clad interface are fabricated by inserting a glass core rod into a cladding glass tube sized so that space remains between them, sealing the top and bottom of the tube onto the core rod to form a seated space between them which is relatively soot free and under a vacuum and then hot isostatically pressing the seated composite ... |
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| Length and Elongation Sensor |
07 APR 1998 |
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| Authors:
Louis E. Sansone; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A length and elongation sensor includes an elastomeric optical wave guide and a time domain reflectometer. The elastomeric optical wave guide consists of a urethane outer cladding and an optical gel core. A transparent window is hermetically sealed to the first end of the optical wave guide and a reflective mirror is hermetically sealed to the second end of the optical wave guide. Both ends of the wave guide are ... |
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| Interferometric Measurement with Squeezed Light |
01 APR 98 |
9 pages |
| Authors:
H. A. Haus; E. P. Ippen; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| The theoretical and experimental work in this reporting period was concerned with the generation and utilization of squeezed pulsed radiation. Improved sensitivity of fiber gyros with noise levels below the shot noise level is one possible utilization of such radiation. |
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| Co-Doped Optical Fiber Lasers |
APR 1998 |
19 pages |
| Authors:
T. F. Morse; J. M. Battiato; HOPE TECHNOLOGIES INC PROVIDENCE RI
|
| Aerosol techniques for the incorporation of rare dopants into optical fiber preforms have been developed. This enables us to obtain liquid precursors that have a high degree of homogeneity at the molecular level, thus inhibiting phase separation in the final rare earth doped glass. This offers the possibility of convenient co-doping of optical fiber lasers using the Modified Chemical Vapor Deposition (MCVD) process. In this work, we describe how this ... |
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| Development of Highly Active Electro-Optic Polymers for In-Line Fiber Photonic Devices |
31 MAR 1998 |
56 pages |
| Authors:
Richard A. Hill; OPTIVISION INC PALO ALTO CA
|
| Optivision has competed a Phase I STTR project with the objective of developing highly active, electro-optic (EO) polymers tailored for use in in- line fiber photonic devices. The specific Phase I tasks were: (1) Synthesize or obtain a quantity of "development" polymer. (2) Develop suitable processing and characterization methodologies. (3) Perform device level testing of EO polymers using a polymeric in-line fiber (PILF) structure. (4) Identify suitable nonlinear optical (NLO) ... |
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| Polarization-Stable Laser |
31 MAR 1998 |
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| Authors:
Ronald D. Esman; Irl N. Duling III; James L. Dexter; David G. Cooper; DEPARTMENT OF THE NAVY WASHINGTON DC
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| An optical device includes a polarization section having a port, the polarization section being for receiving light at the port and for outputting light at the port with a state of polarization orthoconjugate to the light received at the port. The polarization section includes a reflector, a bidirectional nonreciprocal rotator and a bidirectional polarizer. The bidirectional nonreciprocal rotator has first and second ends, the first end being operatively coupled to ... |
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| Fiber Optic Sound Velocity Profiler |
31 MAR 1998 |
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| Authors:
Anthony A. Ruffa; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A fiber optic cable, coated to increase its sensitivity to acoustic pressure, is towed through a medium. The optical fiber contains Bragg grating sensors at regular intervals along its length. A steerable array of transducers sends a pulse of sound in the direction of the optical cable while broadband pulses of light are directed down the optical fiber. The pulses of light are selectively reflected back according to the spacing ... |
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| Dynamical Systems Techniques in Nonlinear Optics |
18 MAR 98 |
3 pages |
| Authors:
Christopher K. Jones; BROWN UNIV PROVIDENCE RI DIV OF APPLIED MATHEMATICS
|
| The PI and a student have been working in close consultation with researchers at AFRL/DEL on developing a geometric view of the optically injected laser problem. An interesting source of complex behavior (chaos) has been uncovered. This complicated behavior is the result of parametric sweeping across a resonance. From the experimental and practical perspective this is a natural scenario and the possibility of implementing it experimentally has ... |
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| Infra-Structure Support for the Laboratory for Lightwave Technology |
14 MAR 1998 |
2 pages |
| Authors:
T. F. Morse; BROWN UNIV PROVIDENCE RI
|
| The instrumentation funding for the Laboratory of Lightwave Technology permitted a significant extension of our experimental capabilities. The largest single item was the Purchase of a Coherent FReD Laser. |
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| Optoelectronic Integrated Circuits |
10 MAR 98 |
127 pages |
| Authors:
Ramu V. Ramaswamy; SPIE-THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING BELLINGHAM WA
|
| Partial Contents: Progress in normal incidence III-V quantum well infrared photodetectors. Technologies for large scale IaP based optoelectronic integrated circuits. GaAs/AIGaAs traveling-wave electro-optic modulators. Modeling and simulation of optoelectronic multichip modules using VHDL. Progress in optoelectronic polymers and devices. |
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| Analysis of Optically Active Material Fibers |
MAR 1998 |
28 pages |
| Authors:
Philipp Kornreich; SYRACUSE UNIV NY OFFICE OF SPONSORED PROGRAMS
|
| This report describes a method of producing, and test results of, optical fibers having an optically active material at the core/cladding boundary. Two fibers were made and tested. The first has a thin AlCu alloy strip running the length of the fiber, the width of the strip covering approximately fifteen degrees of arc as seen looking at the fiber's cross section. The second has a thin ... |
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| Passively Mode-Locked Erbium-Doped Fiber Lasers Using Multiple Quantum Well Saturable Absorbers |
MAR 98 |
133 pages |
| Authors:
Michael J. Hayduk; ROME LAB ROME NY
|
| An experimental study of the mode-locking process in erbium-doped fiber lasers (EDFL's) operating at 1.55 microns using multiple quantum well saturable absorbers is presented. The self-starting passively mode-locked laser was constructed in a Fabry-Perot configuration using the saturable absorber as the back reflector of the cavity. Picosecond pulses that range from 14.2 to 38.8 ps were generated using a series of saturable absorbers. The pulse widths were dependent upon the ... |
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| Pulse Propagation Through Fiber Bragg Gratings |
MAR 98 |
23 pages |
| Authors:
Joseph W. Haus; RENSSELAER POLYTECHNIC INST TROY NY
|
| A model was constructed to describe pulse propagation and frequency conversion in fiber Bragg gratings. The theoretical issues connected with pulse propagation in fibers with fiber Bragg gratings as dispersive elements were examined. The elements can also be designed for use as linear or nonlinear optoelectronic devices. The project included computational and analytical calculations on the amplitude equations, derived by a multiple scales technique, and the results were tested against ... |
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| Optically Tuned Fiber Gratings |
MAR 1998 |
12 pages |
| Authors:
Anatoly Grudinin; SOUTHAMPTON UNIV (UNITED KINGDOM) OPTOELECTRONICS RESEARCH CENTRE
|
| This report results from a contract tasking University of Southampton as follows: The contractor will investigate two areas: (1) explore optically tuned fiber grating written in birefringent fiber; and (2) study photorefractive and relevant nonlinear characteristics of glasses with enhanced non-linearity. In accordance with the specification, a fiber grating should be tuned within the range of 1 nanometer and dynamic rise-time shorter than 100 picosecond. The most straightforward way to ... |
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| Dynamics of Solitary Wave Pulses Near the Zero-Dispersion Wavelength in Optical Fibers |
28 JAN 98 |
3 pages |
| Authors:
Triantaphyllos R. Akylas; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING
|
| To counteract the effects of dispersion in the transmission of signals in optical fibers, it is desirable to use nonlinear wave pulses in the form of solitary waves which feature a perfect balance of dispersion and nonlinearity and are known to be possible in the anomalous dispersion regime. Near the zero-dispersion wavelength (ZDW), the borderline between normal and anomalous dispersion, however, dispersive effects are relatively ... |
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| Method and Apparatus for Photobleaching Patterns in Irradiated Optical Waveguides |
13 JAN 1998 |
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| Authors:
Scott L. Patton; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A method and apparatus for photobleaching predetermined patterns in an optical wavegulde. The apparatus irradiates the optical waveguide generally held in a fixture. The irradiation includes a selected region or regions of the optical waveguide Or the entire optical waveguide. The radiation interacts with radiation sensitive constituents in the optical waveguide to induce a light transmission loss. After the irradiation is completed. the optical waveguide is allowed to age whereby ... |
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| Apparatus and Process for Making Fiber Optic Bragg Gratings |
13 JAN 1998 |
|
| Authors:
Ignacio M. Perez; Som D. Tyagi; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| At least a part of a first coherent beam of monochromatic light is incident obliquely on the reflecting surface of a mirror to produce a reflected beam in a direction different from that of the first beam. An interference pattern is produced within a volume defined by the intersection of the reflected beam with the first beam. A part of an optical fiber is positioned in the volume containing the ... |
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| Apparatus and Process for Making Fiber Optic Bragg Gratings |
13 JAN 1998 |
10 pages |
| Authors:
Ignacio M. Perez; Som D. Tyagi; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| At least a part of a first coherent beam of monochromatic light is incident obliquely on the reflecting surface of a mirror to produce a reflected beam in a direction different from that of the first beam. An interference pattern is produced within a volume defined by the intersection of the reflected beam with the first beam. A part of an optical fiber is positioned in the volume containing the ... |
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Fiber Optics and Integrated Optics
