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Ultrafast All Optical Switching Based On Ingaasp Grown By He Plasma Assisted Molecular Beam Epitaxy
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Book Synopsis Ultrafast All-optical Switching Based on InGaAsP Grown by He-plasma-assisted Molecular Beam Epitaxy by :
Download or read book Ultrafast All-optical Switching Based on InGaAsP Grown by He-plasma-assisted Molecular Beam Epitaxy written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Li Qian Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612537248 Total Pages :418 pages Book Rating :4.5/5 (372 download)
Book Synopsis Ultrafast All-optical Switching Based on InGaAsP Grown by He-plasma-assisted Molecular Beam Epitaxy [microform] by : Li Qian
Download or read book Ultrafast All-optical Switching Based on InGaAsP Grown by He-plasma-assisted Molecular Beam Epitaxy [microform] written by Li Qian and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2000 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultrafast All-optical Switching Based on InGaAsP Grown by He-plasma-assisted Molecular Beam Epitaxy by : Li Qian
Download or read book Ultrafast All-optical Switching Based on InGaAsP Grown by He-plasma-assisted Molecular Beam Epitaxy written by Li Qian and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the first experimental study of the optical properties of HELP InGaAsP (InGaAsP grown by He-plasma-assisted molecular beam epitaxy) relevant to all-optical switching, and the first demonstration of picosecond switching using this material. We observed an optical response time of 15 ps, a nonlinear index change as large as 0.077, a sharp absorption band edge, and a small absorption tail in HELP InGaAsP. The unique coexistence of ultrafast response, large interband nonlinearity, and small band-tail absorption, never before reported, makes HELP InGaAsP particularly suitable for ultrafast all-optical switching. Additionally, faster response (subpicosecond) was achieved by doping the material with beryllium, and moderate doping (up to ~1018 cm-3) did not significantly alter the absorption edge. We systematically studied the response time variations with doping concentration, annealing temperature, carrier density, and wavelength. We conclude that, (a) Be doping reduces the response time by compensating for donor-like mid-gap states, thus increasing the electron trap concentration; (b) annealing removes defects responsible for fast carrier trapping; (c) the response time increases with carrier density due to limited trap states; (d) the response time varies with wavelength due to difference in electron and hole trapping cross-sections, which were determined based on experimental results and a phenomenological two-trap-level rate equation model. We investigated two types of HELP-InGaAsP-based all-optical switching devices, the nonlinear directional coupler (NLDC) and the asymmetric Fabry-Pérot (AFP) switch. Based on numerical modelling and waveguide loss measurements, we conclude that, while HELP-InGaAsP-based passive NLDCs are in principle viable, practical devices will tend to require high switching energy, and will likely experience low contrast and high insertion loss. We demonstrated that AFP devices will outperform NLDCs in contrast ratio, throughput, bandwidth, switching time, and polarization-sensitivity. We designed and fabricated three prototype AFP devices, and achieved polarization-independent switching with a 5 ps switching window, 20 dB contrast ratio, >=10% throughput, 25-40 nm bandwidth (at >=10 dB contrast ratio), and 0.5-1.4 pJ/[mu]m2 switching energy density. HELP InGaAsP is a promising material for ultrafast switching and other applications requiring ultrafast nonlinear operations. The HELP-InGaAsP-based AFP device we demonstrated is well suited for demultiplexing high-bit-rate data in practical optical communications systems.
Book Synopsis Ultrafast All-optical Switching Using Low-temperature-grown Gallium Arsenide by : Hany Loka
Download or read book Ultrafast All-optical Switching Using Low-temperature-grown Gallium Arsenide written by Hany Loka and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: For low-temperature-grown GaAs (LT-GaAs) the temperature in molecular beam epitaxy (MBE) growth is reduced from the standard 550-650°C range to substrate temperatures between 200°C and 300°C. LT-GaAs is a high quality single crystal with as much as 1-2% excess arsenic incorporation, which gives the material its unique properties. We show that LT-GaAs is a promising material for all-optical switching devices due to its outstanding optical characteristics. We formulate a phenomenological rate equation model to describe the dynamics of the carriers in LT-GaAs. A series of experiments are performed to measure the constants for the model and to optically characterize the material. Our model is very successful in accurately predicting the carrier dynamics over a wide range of time frames, optical intensities and wavelengths. We anticipate that by making minor modifications to the model, we can apply it to similar materials in the telecommunications regime around 1.55 [mu]m. The control of growth and annealing temperatures can be used to tailor the different material constants to fulfill the requirements for different all-optical devices. We investigate the influence of the excitation pulse width on the different dynamics in LT-GaAs. We also use the rate equation model to optimize the material for all-optical switching. By using LT-GaAs one can overcome most of the problems inherent with other materials for all-optical switching. In this thesis we thoroughly examine the use of LT-GaAs as the active layer in a compact and polarization independent asymmetric Fabry-Pérot (AFP) device operating at a center wavelength [lambda] = 850 nm. The device shows some attractive characteristics such as fast switching speed (3ps), large bandwidth (40 nm), low insertion loss (2.8 dB) and high contrast ratio (15 dB) using low average energy flux (200 fJ/[mu]m2). Possible applications of this device are in optical logic gates for ultrafast all-optical time division multiplexing with extremely wide bandwidth and high contrast ratio.
Book Synopsis Summaries of Papers Presented at the Conference on Lasers and Electro-optics by :
Download or read book Summaries of Papers Presented at the Conference on Lasers and Electro-optics written by and published by . This book was released on 2000 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conference Proceedings written by and published by . This book was released on 1998 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Summaries of Papers Presented at the Conference of Lasers and Electro-optics by :
Download or read book Summaries of Papers Presented at the Conference of Lasers and Electro-optics written by and published by . This book was released on 2000 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Digest written by and published by . This book was released on 2000 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference by :
Download or read book Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference written by and published by . This book was released on 1997 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sensing with Terahertz Radiation by : Daniel Mittleman
Download or read book Sensing with Terahertz Radiation written by Daniel Mittleman and published by Springer. This book was released on 2013-02-26 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is two-fold. First, the various different methods of accessing the THz range are discussed, with a view to convince the reader that there have been qualitative and significant improvements over older, more conventional techniques. The text makes it clear that these improvements enable practical "real-world" applications of THz technology, in a manner which would not have been possible before. Second, the demonstrations and feasibility tests described serve as compelling evidence of the utility of such devices. Due to the unique characteristics of THz radiation and its interaction with materials, these devices have substantial advantages over other competing technologies in a number of different areas.
Download or read book Optics Letters written by and published by . This book was released on 1997 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultrafast All-optical Switching Using Low-temperature-grown Gallium Arsenide by :
Download or read book Ultrafast All-optical Switching Using Low-temperature-grown Gallium Arsenide written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Society of Photo-optical Instrumentation Engineers Publisher :Bellingham, Wash. : SPIE--The International Society for Optical Engineering ISBN 13 :9780819429506 Total Pages :1252 pages Book Rating :4.4/5 (295 download)
Book Synopsis Applications of Photonic Technology 3 by : Society of Photo-optical Instrumentation Engineers
Download or read book Applications of Photonic Technology 3 written by Society of Photo-optical Instrumentation Engineers and published by Bellingham, Wash. : SPIE--The International Society for Optical Engineering. This book was released on 1998 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of papers from the International Conference on Applications of Photonic Technology includes articles on a variety of relevant issues and topics.
Book Synopsis Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 2240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NTT Technical Review written by and published by . This book was released on 2004 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt: