The Experts below are selected from a list of 5835 Experts worldwide ranked by ideXlab platform
J.e. Baran - One of the best experts on this subject based on the ideXlab platform.
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Fabrication Tolerance of ti linbo sub 3 waveguides
Journal of Lightwave Technology, 1990Co-Authors: J.e. BaranAbstract:A simulation program based on the three-dimensional beam propagation method (BPM) is used to study the Fabrication conditions of single-mode Ti:LiNbO/sub 3/ waveguides. The calculated cutoff wavelengths are in good agreement with experimental data. The thickness of titanium needed to support the fundamental and first-order modes for three Ti strip widths (6, 7, and 8 mu m) is calculated. The two-dimensional BPM is used to calculate the coupling length from the Fabrication conditions. Results are consistent with measured data. The Fabrication Tolerances of the coupling length of directional couplers are also presented. >
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Fabrication Tolerance of Ti:LiNbO/sub 3/ waveguides
Journal of Lightwave Technology, 1990Co-Authors: J.e. BaranAbstract:A simulation program based on the three-dimensional beam propagation method (BPM) is used to study the Fabrication conditions of single-mode Ti:LiNbO3 waveguides. The calculated cutoff wavelengths are in good agreement with experimental data. The thickness of titanium needed to support the fundamental and first-order modes for three Ti strip widths (6, 7, and 8 μm) is calculated. The two-dimensional BPM is used to calculate the coupling length from the Fabrication conditions. Results are consistent with measured data. The Fabrication Tolerances of the coupling length of directional couplers are also presented.
Way-seen Wang - One of the best experts on this subject based on the ideXlab platform.
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A TE-TM mode splitter on lithium niobate using Ti, Ni, and MgO diffusions
IEEE Photonics Technology Letters, 1994Co-Authors: Way-seen WangAbstract:A new TE-TM mode splitter with an asymmetric Y-junction structure fabricated by diffusing different materials into Y-cut lithium niobate is presented. Randomly polarized light launched into a titanium indiffused waveguide is split into TE and TM modes by two different single-polarization waveguides. The ordinary-polarized waveguide is made by nickel indiffusion and the extraordinary-polarized waveguide by magnesium-oxide induced lithium outdiffusion. The measured extinction ratios are greater than 20 dB for both TE and TM modes. The devices operate over a wide wavelength range and have a large Fabrication Tolerance.
M. S. Rabbani - One of the best experts on this subject based on the ideXlab platform.
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microstrip antenna design with improved Fabrication Tolerance for remote vital signs monitoring and wlan wpan applications at mm wave and thz frequencies
2018Co-Authors: M. S. RabbaniAbstract:A novel approach is introduced to design microstrip patch antennas (MPAs) with improved Fabrication Tolerance for highly demanded Millimetre-wave (mm-wave) (30-300GHz) and Terahertz (THz) (0.3-3THz) frequency applications. The presented MP A designing method overcomes the challenges which exist with the Fabrication and implementation of the conventional MP A designs at mm-wave and THz frequencies. The following research contributions have been added to the state-ofthe- art work: (i) designing of improved size MPAs at 60GHz, 1 OOGHz, 635GHz and 835GHz to prove the designing concept, (ii) detail measurements and analysis of Remote Vital Signs Monitoring (RVSM) with various sizes of the proposed MPA arrays at 60GHz for high detection accuracy and sensitivity, (iii) designing and tes~ing of MP As for 60GHz wireless local and personal area networks (WLAN/WP AN) in point-to-pint, point-to-multipoint and dual-band applications, (iv) implementation and testing of particular Partially Reflective Surface, Dielectric Lens and Defected Ground Structures on the proposed MP A designs with novel configurations at 60GHz for bandwidth and gain enhancement, and (v~ a comprehensive experimental study on the performance of large array designs with the proposed MP A elements for mm-wave applications. The mentioned research work is explained in the coming chapters in details. Moreover, all mentioned work has already been published.
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Microstrip antenna design with improved Fabrication Tolerance for remote vital signs monitoring and WLAN/WPAN applications at mm-wave and THz frequencies
2018Co-Authors: M. S. RabbaniAbstract:A novel approach is introduced to design microstrip patch antennas (MPAs) with improved Fabrication Tolerance for highly demanded Millimetre-wave (mm-wave) (30-300GHz) and Terahertz (THz) (0.3-3THz) frequency applications. The presented MP A designing method overcomes the challenges which exist with the Fabrication and implementation of the conventional MP A designs at mm-wave and THz frequencies. The following research contributions have been added to the state-ofthe- art work: (i) designing of improved size MPAs at 60GHz, 1 OOGHz, 635GHz and 835GHz to prove the designing concept, (ii) detail measurements and analysis of Remote Vital Signs Monitoring (RVSM) with various sizes of the proposed MPA arrays at 60GHz for high detection accuracy and sensitivity, (iii) designing and tes~ing of MP As for 60GHz wireless local and personal area networks (WLAN/WP AN) in point-to-pint, point-to-multipoint and dual-band applications, (iv) implementation and testing of particular Partially Reflective Surface, Dielectric Lens and Defected Ground Structures on the proposed MP A designs with novel configurations at 60GHz for bandwidth and gain enhancement, and (v~ a comprehensive experimental study on the performance of large array designs with the proposed MP A elements for mm-wave applications. The mentioned research work is explained in the coming chapters in details. Moreover, all mentioned work has already been published.
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Fabrication Tolerance and gain improvements of microstrip patch antenna at terahertz frequencies
Microwave and Optical Technology Letters, 2016Co-Authors: M. S. Rabbani, H GhafourishirazAbstract:In this paper, a technique has been proposed to design microstrip antenna arrays at terahertz (THz) frequencies with improved gain and Fabrication Tolerance. The antenna is designed at 100GHz frequency and fabricated with simple laboratory based PCB etching process. The gain is improved to 13.4dBi with the help of only three patch elements. The measured −10dB return loss bandwidth (BW) is 5.55% of the central frequency. The measured and the simulation results are all in good agreement. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1819–1824, 2016
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Improvement of microstrip antenna's gain, bandwidth and Fabrication Tolerance at terahertz frequency bands
Wideband and Multi-Band Antennas and Arrays for Civil Security & Military Applications, 2015Co-Authors: M. S. Rabbani, H. Ghafouri-shirazAbstract:A method has been developed to design microstrip antennas at terahertz (THz) frequencies which improves the antenna gain, bandwidth and Fabrication Tolerance. A microstrip patch antenna is designed at 100GHz frequency and fabricated with the simple laboratory based PCB etching process. The gain is improved to 13.4dBi by using three patch elements. The -10dB return loss bandwidth (BW) is measured to be 5.55% of the central frequency. The measured and the simulation results are in good agreement.
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improvement of microstrip antenna s bandwidth and Fabrication Tolerance at terahertz frequency bands
Wideband and Multi-Band Antennas and Arrays for Civil Security [amp ] Military Applications, 2015Co-Authors: H Ghafourishiraz, M. S. RabbaniAbstract:A method has been developed to design microstrip antennas at terahertz (THz) frequencies which improves the antenna gain, bandwidth and Fabrication Tolerance. A microstrip patch antenna is designed at 100GHz frequency and fabricated with the simple laboratory based PCB etching process. The gain is improved to 13.4dBi by using three patch elements. The -10dB return loss bandwidth (BW) is measured to be 5.55% of the central frequency. The measured and the simulation results are in good agreement.
Tetsuya Mizumoto - One of the best experts on this subject based on the ideXlab platform.
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Single Trench SiON Waveguide TE-TM Mode Converter
IEEE Photonics Technology Letters, 2012Co-Authors: Kenichi Nakayama, Yuya Shoji, Tetsuya MizumotoAbstract:A TE-TM mode converter fabricated in a single trench SiON waveguide is described. The device has the advantage that only single masking and etching process is needed to fabricate it. We discuss the design of the mode converter from the view point of Fabrication Tolerance. The single trench structure is fabricated using the reactive ion-etch lag phenomenon. A 97% TE-TM mode conversion (extinction ratio=15 dB) is demonstrated at a wavelength of 1.27μm . An excess loss is measured to be 0.8 dB.
C.j. Chang-hasnain - One of the best experts on this subject based on the ideXlab platform.
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Tapped delay-line matched filtering using a high-contrast grating hollow-core waveguide
IEEE Photonic Society 24th Annual Meeting, 2011Co-Authors: Hao Huang, Lin Zhang, C.j. Chang-hasnain, Christopher Chase, Bishara Shamee, Forrest G. Sedgwick, Alan E. WillnerAbstract:A tapped delay-line matched filter is designed using high-contrast grating hollow-core waveguides. Simulation results indicate a SNR gain of 18.24dB, which is ~83% of an idea matched filter, and a Fabrication Tolerance of ~ 75-nm.
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Large Fabrication Tolerance for VCSELs Using High-Contrast Grating
IEEE Photonics Technology Letters, 2008Co-Authors: Ye Zhou, M.c.y. Huang, C.j. Chang-hasnainAbstract:We report the experimental demonstration of a large Fabrication Tolerance for a single-layer, highly reflective high-index-contrast subwavelength grating (HCG) mirror. HCG vertical-cavity surface-emitting lasers (VCSELs) are demonstrated with plusmn20% variation in the HCG critical dimension. Emission wavelength of the HCG-VCSEL shifts only 2 nm with 40% change in grating spacing and 8% change in grating period.
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High-Contrast Subwavelength Grating Integrated VCSELs with a Large Fabrication Tolerance
2007 International Nano-Optoelectronics Workshop, 2007Co-Authors: Ye Zhou, M.c.y. Huang, Johannes Kern, C.j. Chang-hasnainAbstract:We experimentally demonstrated a very large Fabrication Tolerance for the high-index-contrast subwavelength grating (HCG) integrated VCSELs, with similar performance over as large as plusmn20% variation in HCG critical dimension.
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Large Fabrication Tolerance of ultrabroadband sub-wavelength grating reflector
The 17th Annual Meeting of the IEEELasers and Electro-Optics Society 2004. LEOS 2004., 2004Co-Authors: M.c.y. Huang, D. Parekh, C.j. Chang-hasnainAbstract:The Fabrication Tolerance of the highly reflective sub-wavelength grating (SWG) structure is examined, particularly the effect of reflectivity from etching imperfections, with calculations using rigorous coupled wave analysis method.
