The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Weihua Guo - One of the best experts on this subject based on the ideXlab platform.
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the full characterization of fabry perot lasers using the Fourier Series Expansion method
International Conference on Transparent Optical Networks, 2011Co-Authors: Weihua Guo, Brian Corbett, Diarmuid Byrne, J F DoneganAbstract:The characterization of the performance of Fabry-Perot lasers based on measurements of the amplified spontaneous emission (ASE) spectrum and analysis using the Fourier Series Expansion method is presented in this paper. We explain how all the parameters of net modal gain, internal loss, quasi-Fermi level separation, linewidth enhancement factor, injection efficiency, and geometric spontaneous emission factor, can be obtained providing a unique method of extracting a large number of parameters from one simple measurement.
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fabry perot laser characterization based on the amplified spontaneous emission spectrum and the Fourier Series Expansion method
IEEE Journal of Selected Topics in Quantum Electronics, 2011Co-Authors: Weihua Guo, D. Byrne, Brian Corbett, J F DoneganAbstract:Comprehensive Fabry-Perot laser characterization based on measurements of the amplified spontaneous emission spectrum analyzed using the Fourier Series Expansion method is presented. The parameters of net modal gain, internal loss, quasi-Fermi level separation, linewidth enhancement factor, injection efficiency, and geometric spontaneous emission factor can all be extracted.
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measurement of linewidth enhancement factors for ingaalas laser diode by Fourier Series Expansion method
Electronics Letters, 2007Co-Authors: D. Byrne, Weihua Guo, John F. Donegan, Richard Phelan, Brian CorbettAbstract:The Fourier Series Expansion method is used to measure the linewidth enhancement factor of an InGaAlAs Fabry-Perot semiconductor laser from the below-threshold amplified spontaneous emission spectrum. It is shown that using this method, the linewidth enhancement factor can be obtained independently of the resolution bandwidth of the optical spectrum analyser.
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Measurement of the Linewidth Enhancement Factor of InGaAlAs and InGaAsP laser diodes using the Fourier Series Expansion of the Amplified Spontaneous Emission spectrum
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007Co-Authors: D. Byrne, Weihua Guo, John F. Donegan, Richard Phelan, Brian CorbettAbstract:The optical gain and linewidth enhancement factor (alpha) of a semiconductor laser are important parameters for device performance and design, especially for widely tunable lasers. The Hakki-Paoli (H-P) method is the most common method for measuring alpha. However this method of determining alpha is dependent on the resolution bandwidth of the analyser used. Here we introduce the Fourier Series Expansion (FSE) method to calculate alpha by first finding the round trip gain. By performing a Fourier Series Expansion on each longitudinal mode in the cavity and finding the ratio of two successive Fourier coefficients.
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Fourier Series Expansion method for gain measurement from amplified spontaneous emission spectra of fabry perot semiconductor lasers
IEEE Journal of Quantum Electronics, 2004Co-Authors: Weihua Guo, Yongzhen HuangAbstract:A gain measurement technique, based on Fourier Series Expansion of periodically extended single fringe of the amplified spontaneous emission spectrum, is proposed for Fabry-Perot semiconductor lasers. The underestimation of gain due to the limited resolution of the measurement system is corrected by a factor related to the system response function. The standard deviations of the gain-reflectivity product under low noise conditions are analyzed for the Fourier Series Expansion method and compared with those of the Hakki-Paoli method and Cassidy's method. The results show that the Fourier Series Expansion method is the least sensitive to noise among the three methods. The experiment results obtained by the three methods are also presented and compared.
Brian Corbett - One of the best experts on this subject based on the ideXlab platform.
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the full characterization of fabry perot lasers using the Fourier Series Expansion method
International Conference on Transparent Optical Networks, 2011Co-Authors: Weihua Guo, Brian Corbett, Diarmuid Byrne, J F DoneganAbstract:The characterization of the performance of Fabry-Perot lasers based on measurements of the amplified spontaneous emission (ASE) spectrum and analysis using the Fourier Series Expansion method is presented in this paper. We explain how all the parameters of net modal gain, internal loss, quasi-Fermi level separation, linewidth enhancement factor, injection efficiency, and geometric spontaneous emission factor, can be obtained providing a unique method of extracting a large number of parameters from one simple measurement.
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fabry perot laser characterization based on the amplified spontaneous emission spectrum and the Fourier Series Expansion method
IEEE Journal of Selected Topics in Quantum Electronics, 2011Co-Authors: Weihua Guo, D. Byrne, Brian Corbett, J F DoneganAbstract:Comprehensive Fabry-Perot laser characterization based on measurements of the amplified spontaneous emission spectrum analyzed using the Fourier Series Expansion method is presented. The parameters of net modal gain, internal loss, quasi-Fermi level separation, linewidth enhancement factor, injection efficiency, and geometric spontaneous emission factor can all be extracted.
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measurement of linewidth enhancement factors for ingaalas laser diode by Fourier Series Expansion method
Electronics Letters, 2007Co-Authors: D. Byrne, Weihua Guo, John F. Donegan, Richard Phelan, Brian CorbettAbstract:The Fourier Series Expansion method is used to measure the linewidth enhancement factor of an InGaAlAs Fabry-Perot semiconductor laser from the below-threshold amplified spontaneous emission spectrum. It is shown that using this method, the linewidth enhancement factor can be obtained independently of the resolution bandwidth of the optical spectrum analyser.
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Measurement of the Linewidth Enhancement Factor of InGaAlAs and InGaAsP laser diodes using the Fourier Series Expansion of the Amplified Spontaneous Emission spectrum
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007Co-Authors: D. Byrne, Weihua Guo, John F. Donegan, Richard Phelan, Brian CorbettAbstract:The optical gain and linewidth enhancement factor (alpha) of a semiconductor laser are important parameters for device performance and design, especially for widely tunable lasers. The Hakki-Paoli (H-P) method is the most common method for measuring alpha. However this method of determining alpha is dependent on the resolution bandwidth of the analyser used. Here we introduce the Fourier Series Expansion (FSE) method to calculate alpha by first finding the round trip gain. By performing a Fourier Series Expansion on each longitudinal mode in the cavity and finding the ratio of two successive Fourier coefficients.
J F Donegan - One of the best experts on this subject based on the ideXlab platform.
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the full characterization of fabry perot lasers using the Fourier Series Expansion method
International Conference on Transparent Optical Networks, 2011Co-Authors: Weihua Guo, Brian Corbett, Diarmuid Byrne, J F DoneganAbstract:The characterization of the performance of Fabry-Perot lasers based on measurements of the amplified spontaneous emission (ASE) spectrum and analysis using the Fourier Series Expansion method is presented in this paper. We explain how all the parameters of net modal gain, internal loss, quasi-Fermi level separation, linewidth enhancement factor, injection efficiency, and geometric spontaneous emission factor, can be obtained providing a unique method of extracting a large number of parameters from one simple measurement.
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fabry perot laser characterization based on the amplified spontaneous emission spectrum and the Fourier Series Expansion method
IEEE Journal of Selected Topics in Quantum Electronics, 2011Co-Authors: Weihua Guo, D. Byrne, Brian Corbett, J F DoneganAbstract:Comprehensive Fabry-Perot laser characterization based on measurements of the amplified spontaneous emission spectrum analyzed using the Fourier Series Expansion method is presented. The parameters of net modal gain, internal loss, quasi-Fermi level separation, linewidth enhancement factor, injection efficiency, and geometric spontaneous emission factor can all be extracted.
Ce Liu - One of the best experts on this subject based on the ideXlab platform.
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computation of the effective dielectric constant of two component three dimensional mixtures using a simple pole Expansion method
Journal of Applied Physics, 1997Co-Authors: Ce LiuAbstract:Bergman and Milton proved that the effective dielectric constant or conductivity of a two-component composite material is a function of the ratio of the dielectric constants or conductivities of the components which can be described by a Series of simple poles and residues. These poles and residues are determined only by the microgeometry of the composite. In this study, we use a simplified three-dimensional Fourier Series Expansion method to locate the poles and residues for simple cubic, body-centered, and face-centered lattices in different concentrations. Comparison between the simple pole theory and the Fourier Series Expansion method shows a good agreement.
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a simplified Fourier Series Expansion method for computing the effective dielectric constant of a two component three dimensional composite material with geometric symmetry
Modelling and Simulation in Materials Science and Engineering, 1996Co-Authors: Ce Liu, Qun ZouAbstract:The mixing theory for predicting electric behaviors of composite materials is essential to the interpretation of electromagnetic remote sensing and material sciences. Developing an accurate and versatile computation method to evaluate the effective dielectric constant of a composite material has been an interesting topic. Since the effective dielectric constant of the composite material is a function of both the dielectric constant of each component and the microgeometry of the material, a mixing theory has to consider the role of the geometric structure of the material. We present a method to compute the effective dielectric constant of a two-component three-dimensional mixture with geometric symmetry using a simplified Fourier Series Expansion. The developed method can be applied to materials with arbitrary porosity. Three models have been studied: simple, body-centered, and face-centered cubic lattices. The Fourier Series Expansion method avoids the difficulty of boundary-condition matching and has no limit on the porosities of composite materials. To simplify the Fourier Series Expansion technique, geometric symmetry of the composite material is assumed. The computed numerical results have verified the success of the formulation. The electric field distribution in the material is also presented. We calculated the effective dielectric constant with a CPU time reduction of 1.2 - 6 times for the first-order approximation and 5 - 26 times for the second order compared to the formulation without considering geometry symmetry.
D. Byrne - One of the best experts on this subject based on the ideXlab platform.
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fabry perot laser characterization based on the amplified spontaneous emission spectrum and the Fourier Series Expansion method
IEEE Journal of Selected Topics in Quantum Electronics, 2011Co-Authors: Weihua Guo, D. Byrne, Brian Corbett, J F DoneganAbstract:Comprehensive Fabry-Perot laser characterization based on measurements of the amplified spontaneous emission spectrum analyzed using the Fourier Series Expansion method is presented. The parameters of net modal gain, internal loss, quasi-Fermi level separation, linewidth enhancement factor, injection efficiency, and geometric spontaneous emission factor can all be extracted.
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measurement of linewidth enhancement factors for ingaalas laser diode by Fourier Series Expansion method
Electronics Letters, 2007Co-Authors: D. Byrne, Weihua Guo, John F. Donegan, Richard Phelan, Brian CorbettAbstract:The Fourier Series Expansion method is used to measure the linewidth enhancement factor of an InGaAlAs Fabry-Perot semiconductor laser from the below-threshold amplified spontaneous emission spectrum. It is shown that using this method, the linewidth enhancement factor can be obtained independently of the resolution bandwidth of the optical spectrum analyser.
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Measurement of the Linewidth Enhancement Factor of InGaAlAs and InGaAsP laser diodes using the Fourier Series Expansion of the Amplified Spontaneous Emission spectrum
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007Co-Authors: D. Byrne, Weihua Guo, John F. Donegan, Richard Phelan, Brian CorbettAbstract:The optical gain and linewidth enhancement factor (alpha) of a semiconductor laser are important parameters for device performance and design, especially for widely tunable lasers. The Hakki-Paoli (H-P) method is the most common method for measuring alpha. However this method of determining alpha is dependent on the resolution bandwidth of the analyser used. Here we introduce the Fourier Series Expansion (FSE) method to calculate alpha by first finding the round trip gain. By performing a Fourier Series Expansion on each longitudinal mode in the cavity and finding the ratio of two successive Fourier coefficients.