The Experts below are selected from a list of 8988 Experts worldwide ranked by ideXlab platform
Xiaoyi Dong - One of the best experts on this subject based on the ideXlab platform.
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Postfabrication wavelength trimming of Fiber Bragg gratings written in H/sub 2/-Loaded Fibers
IEEE Photonics Technology Letters, 2001Co-Authors: Bai-ou Guan, Hwa-yaw Tam, Xiaoyi DongAbstract:A postfabrication technique for writing Fiber Bragg gratings in H/sub 2/-Loaded Fiber with precise wavelength control is reported. The grating wavelength is highly stable and less than a 0.01-nm shift was observed after storing at room temperature for two months. This technique allows 1 nm of wavelength trimming and significantly enhances the grating thermal stability.
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Growth of long-period gratings in H 2 -Loaded Fiber after 193-nm UV inscription
IEEE Photonics Technology Letters, 2000Co-Authors: Bai-ou Guan, Hwa-yaw Tam, S.y. Liu, Xiaoyi DongAbstract:This letter reports and provides an explanation for the growth behavior of long-period gratings in H/sub 2/-Loaded Fiber immediately after 193-nm UV inscription. Growth of grating resonance peak by as much as 14 dB was measured. Impact of temperature and grating strength, immediately after UV inscription, on the growth behavior are also discussed.
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Highly stable Fiber Bragg gratings written in hydrogen-Loaded Fiber
IEEE Photonics Technology Letters, 2000Co-Authors: Bai-ou Guan, Hwa-yaw Tam, Xiaoming Tao, Xiaoyi DongAbstract:We demonstrated that the thermal stability of Fiber Bragg gratings written in hydrogen-Loaded standard Fibers can be significantly enhanced by preirradiating the Fiber with UV beam before writing gratings. Our experimental result shows that these gratings maintained more than 60% of their initial index modulation after 10 hours at 605/spl deg/C.
Bai-ou Guan - One of the best experts on this subject based on the ideXlab platform.
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Postfabrication wavelength trimming of Fiber Bragg gratings written in H2-Loaded Fibers
Photonic Systems and Applications, 2001Co-Authors: Bai-ou Guan, Hwa-yaw Tam, Helen L. W. Chan, Chung-loong ChoyAbstract:A postfabrication technique for writing Fiber Bragg gratings in H2-Loaded Fiber with precise wavelength control is reported. The grating wavelength is highly stable and less than 0.01 nm shift was observed after storing at room temperature for 2 months. This technique allows 1 nm of wavelength trimming and significantly enhances the grating thermal stability.
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Postfabrication wavelength trimming of Fiber Bragg gratings written in H/sub 2/-Loaded Fibers
IEEE Photonics Technology Letters, 2001Co-Authors: Bai-ou Guan, Hwa-yaw Tam, Xiaoyi DongAbstract:A postfabrication technique for writing Fiber Bragg gratings in H/sub 2/-Loaded Fiber with precise wavelength control is reported. The grating wavelength is highly stable and less than a 0.01-nm shift was observed after storing at room temperature for two months. This technique allows 1 nm of wavelength trimming and significantly enhances the grating thermal stability.
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Inpact of hydrogen in long-period gratings after 193nm UV inscription
Fourteenth International Conference on Optical Fiber Sensors, 2000Co-Authors: Bai-ou Guan, Anna Grazia Mignani, H. C. LefèvreAbstract:This paper reports and provides an explanation for the growth behavior of long-period gratings in H 2 -Loaded Fiber immediately after 193nm UV inscription. Growth of grating resonance peak by as much as 14 dB was measured.Impact of temperature and grating strength, immediately after UV inscription, on the growth behavior are also discussed.
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Growth of long-period gratings in H 2 -Loaded Fiber after 193-nm UV inscription
IEEE Photonics Technology Letters, 2000Co-Authors: Bai-ou Guan, Hwa-yaw Tam, S.y. Liu, Xiaoyi DongAbstract:This letter reports and provides an explanation for the growth behavior of long-period gratings in H/sub 2/-Loaded Fiber immediately after 193-nm UV inscription. Growth of grating resonance peak by as much as 14 dB was measured. Impact of temperature and grating strength, immediately after UV inscription, on the growth behavior are also discussed.
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Highly stable Fiber Bragg gratings written in hydrogen-Loaded Fiber
IEEE Photonics Technology Letters, 2000Co-Authors: Bai-ou Guan, Hwa-yaw Tam, Xiaoming Tao, Xiaoyi DongAbstract:We demonstrated that the thermal stability of Fiber Bragg gratings written in hydrogen-Loaded standard Fibers can be significantly enhanced by preirradiating the Fiber with UV beam before writing gratings. Our experimental result shows that these gratings maintained more than 60% of their initial index modulation after 10 hours at 605/spl deg/C.
Hwa-yaw Tam - One of the best experts on this subject based on the ideXlab platform.
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A technique for enhancing the thermal stability of hydrogen-Loaded Fiber Bragg grating
Chinese Optics Letters, 2003Co-Authors: Hwa-yaw TamAbstract:Heat treatment with the presence of hydrogen (H_(2)) that react with GeE0 centers (·Ge ?) at high temperature will weaken the refractive index modulation of grating fabricated in hydrogen-Loaded normal germanosilicate Fiber. Pre-annealing treatment of the above Fiber was demonstrated to be able to enhance the grating's thermal stability effectively. 0.37-nm blue-shift of the reflected Bragg wavelength was observed.
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Postfabrication wavelength trimming of Fiber Bragg gratings written in H2-Loaded Fibers
Photonic Systems and Applications, 2001Co-Authors: Bai-ou Guan, Hwa-yaw Tam, Helen L. W. Chan, Chung-loong ChoyAbstract:A postfabrication technique for writing Fiber Bragg gratings in H2-Loaded Fiber with precise wavelength control is reported. The grating wavelength is highly stable and less than 0.01 nm shift was observed after storing at room temperature for 2 months. This technique allows 1 nm of wavelength trimming and significantly enhances the grating thermal stability.
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Postfabrication wavelength trimming of Fiber Bragg gratings written in H/sub 2/-Loaded Fibers
IEEE Photonics Technology Letters, 2001Co-Authors: Bai-ou Guan, Hwa-yaw Tam, Xiaoyi DongAbstract:A postfabrication technique for writing Fiber Bragg gratings in H/sub 2/-Loaded Fiber with precise wavelength control is reported. The grating wavelength is highly stable and less than a 0.01-nm shift was observed after storing at room temperature for two months. This technique allows 1 nm of wavelength trimming and significantly enhances the grating thermal stability.
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Growth of long-period gratings in H 2 -Loaded Fiber after 193-nm UV inscription
IEEE Photonics Technology Letters, 2000Co-Authors: Bai-ou Guan, Hwa-yaw Tam, S.y. Liu, Xiaoyi DongAbstract:This letter reports and provides an explanation for the growth behavior of long-period gratings in H/sub 2/-Loaded Fiber immediately after 193-nm UV inscription. Growth of grating resonance peak by as much as 14 dB was measured. Impact of temperature and grating strength, immediately after UV inscription, on the growth behavior are also discussed.
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Highly stable Fiber Bragg gratings written in hydrogen-Loaded Fiber
IEEE Photonics Technology Letters, 2000Co-Authors: Bai-ou Guan, Hwa-yaw Tam, Xiaoming Tao, Xiaoyi DongAbstract:We demonstrated that the thermal stability of Fiber Bragg gratings written in hydrogen-Loaded standard Fibers can be significantly enhanced by preirradiating the Fiber with UV beam before writing gratings. Our experimental result shows that these gratings maintained more than 60% of their initial index modulation after 10 hours at 605/spl deg/C.
M. Toney - One of the best experts on this subject based on the ideXlab platform.
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The transverse compression of PPTA Fibers Part I Single Fiber transverse compression testing
Journal of Materials Science, 2000Co-Authors: J Singletary, Melur K. Ramasubramanian, Warren Knoff, H. Davis, M. ToneyAbstract:We report on the transverse compression testing of fine,highly anisotropic polymer Fibers. Single KEVLAR 29 Fibers were laid on a flat, stiff platen, and compressed by a second, stiff, parallel platen. Test output was a force-deflection curve, from which the effective transverse modulus, apparent strain at yield and the work required to compress the Fibers were determined. The effects of specimen aspect ratio was examined experimentally and by finite element simulation for Loaded Fiber lengths of 1/4 to 7 Fiber diameters, and a method proposed to deduce the plane strain response from short aspect ratio tests.
Abdul-hamid Zureick - One of the best experts on this subject based on the ideXlab platform.
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PROBABILISTIC BASED DESIGN OF CONCENTRICALLY Loaded Fiber-REINFORCED POLYMERIC COMPRESSION MEMBERS
Journal of Structural Engineering-asce, 2004Co-Authors: Maha Alqam, Richard M. Bennett, Abdul-hamid ZureickAbstract:This paper presents an analytical probabilistic based design procedure for concentrically Loaded compression members of Fiber-reinforced polymeric composite materials. Resistance factors for use in a load and resistance factor design format are developed for flexural buckling of doubly symmetric sections, both flexural buckling and flexural-torsional buckling of equal leg angles, and material failure. The developed resistance factors are a function of the coefficient of variation of the appropriate material properties. The proposed resistance factors were determined to provide a reliability index of 3.0 for buckling limit states and a reliability index of 3.5 for the material fracture limit state. A proposed method of developing an allowable stress design code is also given.
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SHORT-TERM BEHAVIOR AND DESIGN OF Fiber-REINFORCED POLYMERIC SLENDER MEMBERS UNDER AXIAL COMPRESSION
Journal of Composites for Construction, 1997Co-Authors: Abdul-hamid Zureick, David ScottAbstract:Presented in this paper are results of an experimental investigation pertaining to the short-term behavior of concentrically Loaded Fiber-reinforced polymeric composite slender members. Tested members had box and I-shape cross sections and were pultruded using a vinylester matrix containing flame retardant additives reinforced with E-glass roving and nonwoven mats. Material properties for each tested member are used in a limit state predictor equation to correlate the experimental and the predicted results. Design guidelines and a step-by-step example are also presented.