The Experts below are selected from a list of 2208 Experts worldwide ranked by ideXlab platform
M. Marhic - One of the best experts on this subject based on the ideXlab platform.
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Investigation of Gain Ripple in two-pump fiber optical parametric amplifiers.
Optics Letters, 2008Co-Authors: Armand Vedadi, M. Marhic, Eric Lantz, Hervé Maillotte, Thibaut SylvestreAbstract:By using the four-sideband theory, we analyze the Gain spectrum in wideband two-pump fiber optical parametric amplifiers and predict Gain Ripples over the flat Gain region. We derive an approximation of their pseudo-periods and discuss methods for reducing their amplitudes.
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Gain-clamped thulium-doped fibre amplifier with single pump at 1050 nm
Electronics Letters, 2004Co-Authors: Yoshinobu Akasaka, M. Marhic, L. KazovskyAbstract:The large homogeneous bandwidth of a thulium-doped fibre amplifier makes it suitable for optical Gain clamping. This has been demonstrated experimentally. Gain variation of 1.2 dB for 15 dB input dynamic range has been achieved, with less than 1 dB Gain Ripple over 20 nm, and no noise figure degradation, while pumped at 1050 nm.
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Gain-clamped thulium-doped fiber amplifier with a single pump at 1050nm
OFC 2003 Optical Fiber Communications Conference 2003., 2003Co-Authors: F. An, L. Kazovsky, M. Marhic, Yoshinobu AkasakaAbstract:The large homogeneous bandwidth of thulium-doped fiber amplifier makes it suitable for optical Gain clamping. This is demonstrated experimentally with Gain variation of 1.2dB for 15dB input dynamic range, less than 1dB Gain Ripple over 20nm, without noise figure degradation.
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broadband fiber optical parametric amplifiers and wavelength converters with low Ripple chebyshev Gain spectra
Optics Letters, 1996Co-Authors: M. Marhic, Y Park, F S Yang, L G KazovskyAbstract:Theory predicts that a two-pump fiber optical parametric amplifier or wavelength converter operated near the fiber zero-dispersion wavelength can exhibit a Gain spectrum approximated by a Chebyshev polynomial of order 8. Under realistic conditions of pump spacing and fiber dispersion, very low-Gain Ripple can be obtained over a large bandwidth. For example, a dispersion-shifted fiber can provide a signal amplifier with a Gain of 20 dB with 0.2-dB uniformity over a 45-nm bandwidth. Potential limitations are discussed.
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broadband fiber optic parametric amplifiers and wavelength converters with low Ripple chebyshev Gain spectra
Lasers and Electro-Optics Society Meeting, 1996Co-Authors: M. Marhic, Y Park, F S Yang, L G KazovskyAbstract:We have shown that the propagation constant mismatch /spl Lambda//spl beta/ for a 2-pump fiber OPA can be well approximated by a fourth-order Chebyshev polynomial, by adjusting /spl omega//sub c/, near /spl omega//sub 0/, and the pump spacing. Very low Gain Ripple can be obtained over tens of nanometer. This level of performance is not available with any other type of optical amplifier. It could make fiber OPAs and related wavelength converters attractive when multiple stages are required.
L G Kazovsky - One of the best experts on this subject based on the ideXlab platform.
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broadband fiber optical parametric amplifiers and wavelength converters with low Ripple chebyshev Gain spectra
Optics Letters, 1996Co-Authors: M. Marhic, Y Park, F S Yang, L G KazovskyAbstract:Theory predicts that a two-pump fiber optical parametric amplifier or wavelength converter operated near the fiber zero-dispersion wavelength can exhibit a Gain spectrum approximated by a Chebyshev polynomial of order 8. Under realistic conditions of pump spacing and fiber dispersion, very low-Gain Ripple can be obtained over a large bandwidth. For example, a dispersion-shifted fiber can provide a signal amplifier with a Gain of 20 dB with 0.2-dB uniformity over a 45-nm bandwidth. Potential limitations are discussed.
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broadband fiber optic parametric amplifiers and wavelength converters with low Ripple chebyshev Gain spectra
Lasers and Electro-Optics Society Meeting, 1996Co-Authors: M. Marhic, Y Park, F S Yang, L G KazovskyAbstract:We have shown that the propagation constant mismatch /spl Lambda//spl beta/ for a 2-pump fiber OPA can be well approximated by a fourth-order Chebyshev polynomial, by adjusting /spl omega//sub c/, near /spl omega//sub 0/, and the pump spacing. Very low Gain Ripple can be obtained over tens of nanometer. This level of performance is not available with any other type of optical amplifier. It could make fiber OPAs and related wavelength converters attractive when multiple stages are required.
James F. Buckwalter - One of the best experts on this subject based on the ideXlab platform.
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Staggered Gain for 100+ GHz Broadband Amplifiers
IEEE Journal of Solid-State Circuits, 2011Co-Authors: James F. BuckwalterAbstract:A broadband amplifier is realized with cascaded stagger-tuned stages that are equalized for high bandwidth and low Gain Ripple. The staggered frequency response is demonstrated to improve the transimpedance limit of active circuits. The staggered response is demonstrated with a Darlington feedback amplifier and a constructive wave amplifier, which achieves low group delay. The broadband amplifier is implemented in a 0.12-μm SiGe BiCMOS process and achieves a 3-dB bandwidth of 102 GHz. The Gain is 10 dB with 1.5-dB Gain-Ripple and group-delay variation under ±6 ps over the entire 3-dB bandwidth. The chip occupies an area of 0.29 mm2 including the pads and consumes 73 mW from a 2-V supply.
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A DC-102GHz broadband amplifier in 0.12µm SiGe BiCMOS
2009 IEEE Radio Frequency Integrated Circuits Symposium, 2009Co-Authors: James F. BuckwalterAbstract:An ultra-wideband amplifier scheme is realized with two cascaded stages that are equalized for high-bandwidth and low Gain Ripple. The amplifier is implemented in a 0.12 mum SiGe BiCMOS process and achieves a 3 dB bandwidth of 102 GHz. The Gain is 10 dB with less than 1.5 dB Gain-Ripple and group-delay variation under +/- 6 ps over the entire 3 dB bandwidth. The chip occupies an area of 0.29 mm2 including the pads and consumes 73 mW from a 2 V supply.
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A 35-GHz differential distributed loss-compensation amplifier
2008 IEEE Radio Frequency Integrated Circuits Symposium, 2008Co-Authors: James F. BuckwalterAbstract:The demand for 40+ Gb/s broadband drivers and equalizers for electrical and optical links compels the use of distributed circuit techniques and on-chip loss compensation. A distributed loss-compensation scheme is presented for synthetic transmission lines. The distributed loss-compensated amplifier is implemented in a 120 nm BiCMOS process using only NMOS devices. A 3 dB bandwidth of 35 GHz is measured with Gain Ripple of +/-1 dB while consuming only 18 mW.
Cunjun Ruan - One of the best experts on this subject based on the ideXlab platform.
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A Compact, Mechanically rugged, DC Grounded 45° Slant Polarized Low Gain Ripple Omnidirectional Antenna
2019 IEEE MTT-S International Wireless Symposium (IWS), 2019Co-Authors: Muhammad Shahzad Sadiq, Cunjun RuanAbstract:In this paper, a compact, mechanically rugged, DC grounded 45° slant polarized antenna having very low Gain Ripple in omnidirectional pattern is proposed. The antenna is based on the coaxial cylinder structures, which consists of oversize coaxial cylinders, slots and their feeding assembly and a matching unit. The slant polarization property is realized by four angular slots surrounding the axis of coaxial cylinder in the outer conductor. The antenna is dc ground which eliminates the electrostatic discharge ESD problems. Simulation results show that the antenna bandwidth is of 8.1% (2.56GHz to 2.78 GHz), Gain variation in the horizontal plane is less than ±0.14 dB while the cross-polarization level is below 14dB over the whole bandwidth (2.56-2.78 GHz).
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a compact mechanically rugged dc grounded 45 slant polarized low Gain Ripple omnidirectional antenna
2019 IEEE MTT-S International Wireless Symposium (IWS), 2019Co-Authors: Muhammad Shahzad Sadiq, Cunjun RuanAbstract:In this paper, a compact, mechanically rugged, DC grounded 45° slant polarized antenna having very low Gain Ripple in omnidirectional pattern is proposed. The antenna is based on the coaxial cylinder structures, which consists of oversize coaxial cylinders, slots and their feeding assembly and a matching unit. The slant polarization property is realized by four angular slots surrounding the axis of coaxial cylinder in the outer conductor. The antenna is dc ground which eliminates the electrostatic discharge ESD problems. Simulation results show that the antenna bandwidth is of 8.1% (2.56GHz to 2.78 GHz), Gain variation in the horizontal plane is less than ±0.14 dB while the cross-polarization level is below 14dB over the whole bandwidth (2.56–2.78 GHz).
T.h. Wood - One of the best experts on this subject based on the ideXlab platform.
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impact of relaxed dispersion map and Gain Ripple on ultra wideband 10 gbit s transmission
Electronics Letters, 2003Co-Authors: Drew N. Maywar, D.f. Grosz, A. Agarwal, Mohammad Movassaghi, S. Banerjee, A Kung, T.h. WoodAbstract:The performance of a wide, 53 nm-band fibre-optic transmission system that does not employ slope-matched dispersion-compensation modules or Gain-equalisation filters is studied. Despite having a 2 dB maximum transmission penalty resulting from the non-ideal dispersion map, the Raman-based system exhibits a high system margin of at least 5 dB at 1600 km.
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Impact of relaxed dispersion map and Gain Ripple on ultra-wideband 10 Gbit/s transmission
Electronics Letters, 2003Co-Authors: Drew N. Maywar, D.f. Grosz, A.p. Kung, A. Agarwal, Mohammad Movassaghi, S. Banerjee, T.h. WoodAbstract:The performance of a wide, 53 nm-band fibre-optic transmission system that does not employ slope-matched dispersion-compensation modules or Gain-equalisation filters is studied. Despite having a 2 dB maximum transmission penalty resulting from the non-ideal dispersion map, the Raman-based system exhibits a high system margin of at least 5 dB at 1600 km.
