The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
H Burkhard - One of the best experts on this subject based on the ideXlab platform.
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variation of Coupling Coefficients by sampled gratings in complex coupled distributed feedback lasers
IEEE Journal of Selected Topics in Quantum Electronics, 1995Co-Authors: S Hansmann, H Hillmer, H Walter, H Burkhard, B Hubner, E KuphalAbstract:We present an efficient method for an almost arbitrary variation of the complex Coupling coefficient of distributed feedback lasers by using superstructure gratings, As shown by detailed transfer matrix model calculations the Coupling coefficient can be reduced locally according to the duty cycle of a sampled grating. The additional supermodes caused by the superstructure can be strongly suppressed by choosing a small superperiod so that the supermodes are shifted apart from the gain curve. This novel approach for the realization of nonuniform Coupling Coefficients is applied to analyze experimentally the influence of the complex Coupling strength on the performance of loss coupled InGaAs-InGaAlAs-InP-DFB lasers. >
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realization of high Coupling Coefficients in 1 53 μm ingaasp inp first order quarter wave shifted distributed feedback lasers
Applied Physics Letters, 1990Co-Authors: H Hillmer, S Hansmann, H BurkhardAbstract:Coupling Coefficients as high as 300 cm−1 have been achieved and investigated in the performance of distributed feedback lasers. High Coupling has several important advantages like lower feedback sensitivity, and lower influence on facet reflectivity, thus easy handling for coatings without any penalty in terms of mode hopping. We obtain a side‐mode suppression ratio as high as 51.2 dB. 8 Gb/s ‘‘nonreturn to zero’’ modulation is demonstrated.
H Hillmer - One of the best experts on this subject based on the ideXlab platform.
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variation of Coupling Coefficients by sampled gratings in complex coupled distributed feedback lasers
IEEE Journal of Selected Topics in Quantum Electronics, 1995Co-Authors: S Hansmann, H Hillmer, H Walter, H Burkhard, B Hubner, E KuphalAbstract:We present an efficient method for an almost arbitrary variation of the complex Coupling coefficient of distributed feedback lasers by using superstructure gratings, As shown by detailed transfer matrix model calculations the Coupling coefficient can be reduced locally according to the duty cycle of a sampled grating. The additional supermodes caused by the superstructure can be strongly suppressed by choosing a small superperiod so that the supermodes are shifted apart from the gain curve. This novel approach for the realization of nonuniform Coupling Coefficients is applied to analyze experimentally the influence of the complex Coupling strength on the performance of loss coupled InGaAs-InGaAlAs-InP-DFB lasers. >
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realization of high Coupling Coefficients in 1 53 μm ingaasp inp first order quarter wave shifted distributed feedback lasers
Applied Physics Letters, 1990Co-Authors: H Hillmer, S Hansmann, H BurkhardAbstract:Coupling Coefficients as high as 300 cm−1 have been achieved and investigated in the performance of distributed feedback lasers. High Coupling has several important advantages like lower feedback sensitivity, and lower influence on facet reflectivity, thus easy handling for coatings without any penalty in terms of mode hopping. We obtain a side‐mode suppression ratio as high as 51.2 dB. 8 Gb/s ‘‘nonreturn to zero’’ modulation is demonstrated.
S Hansmann - One of the best experts on this subject based on the ideXlab platform.
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variation of Coupling Coefficients by sampled gratings in complex coupled distributed feedback lasers
IEEE Journal of Selected Topics in Quantum Electronics, 1995Co-Authors: S Hansmann, H Hillmer, H Walter, H Burkhard, B Hubner, E KuphalAbstract:We present an efficient method for an almost arbitrary variation of the complex Coupling coefficient of distributed feedback lasers by using superstructure gratings, As shown by detailed transfer matrix model calculations the Coupling coefficient can be reduced locally according to the duty cycle of a sampled grating. The additional supermodes caused by the superstructure can be strongly suppressed by choosing a small superperiod so that the supermodes are shifted apart from the gain curve. This novel approach for the realization of nonuniform Coupling Coefficients is applied to analyze experimentally the influence of the complex Coupling strength on the performance of loss coupled InGaAs-InGaAlAs-InP-DFB lasers. >
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realization of high Coupling Coefficients in 1 53 μm ingaasp inp first order quarter wave shifted distributed feedback lasers
Applied Physics Letters, 1990Co-Authors: H Hillmer, S Hansmann, H BurkhardAbstract:Coupling Coefficients as high as 300 cm−1 have been achieved and investigated in the performance of distributed feedback lasers. High Coupling has several important advantages like lower feedback sensitivity, and lower influence on facet reflectivity, thus easy handling for coatings without any penalty in terms of mode hopping. We obtain a side‐mode suppression ratio as high as 51.2 dB. 8 Gb/s ‘‘nonreturn to zero’’ modulation is demonstrated.
Luca Larcher - One of the best experts on this subject based on the ideXlab platform.
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a new compact dc model of floating gate memory cells without capacitive Coupling Coefficients
IEEE Transactions on Electron Devices, 2002Co-Authors: Luca Larcher, Paolo Pavan, S Pietri, L Albani, Andrea MarmiroliAbstract:This paper presents for the first time a new compact SPICE model of floating gate nonvolatile memory cells capable to reproduce effectively the complete DC electrical behavior in every bias conditions. This model features many advantages compared to previous ones: it is simple and easy to implement since it uses SPICE circuit elements, is scalable, and its computational time is not excessive. It is based on a new procedure that calculates the floating gate voltage without using fixed capacitive Coupling Coefficients, thus improving the floating gate voltage estimate that is fundamental for the correct modeling of cell operations. Moreover, this model requires only the usual parameters adopted for SPICE-like models of MOS transistors plus the floating gate-control gate capacitance, making it very attractive to industry as the same parameter extraction procedure used for MOS transistors can be directly applied. The model we propose has been validated on E/sup 2/PROM and flash memory cells manufactured in existing technology (0.35 /spl mu/m and 0.25 /spl mu/m) by STMicroelectronics.
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bias and w l dependence of capacitive Coupling Coefficients in floating gate memory cells
IEEE Transactions on Electron Devices, 2001Co-Authors: Luca Larcher, Paolo Pavan, L Albani, T GhilardiAbstract:In this paper, a complete study of capacitive Coupling Coefficients dependence on bias and W/L will be presented, including a review on classic methods to extract their value from electrical characterization. Capacitive Coupling ratios have been usually adopted to model floating gate (FG) memory cells, in particular to deduce the value of FG potential. Now they re determined by means of a new model (recently proposed in the literature), starting from a new procedure to evaluate the FG potential. Results obtained with the new model will be compared to classic values. Particularly, their bias dependence (during write/read/erase of Flash memory cells) will be deeply investigated, thus demonstrating the limits of considering them constants, as is usually done. by analyzing their W/L dependence, we will deduce useful information on the effects of scaling and the role played by fringing capacitances. The most important methods reported in the literature to estimate the control gate and drain capacitive Coupling ratios will be accurately reviewed, thus showing that such procedures are often cumbersome and inaccurate. It is worth noting that for the first time, /spl alpha//sub B/ and /spl alpha//sub S/ will be studied in detail.
Ole Morten Aamo - One of the best experts on this subject based on the ideXlab platform.
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stabilization of linear 2 2 hyperbolic systems with uncertain Coupling Coefficients part i identifier based design
Australian Control Conference, 2016Co-Authors: Henrik Anfinsen, Ole Morten AamoAbstract:We design a state feedback control law to adaptively stabilize a 2 × 2 linear hyperbolic system of partial differential equations (PDEs) with uncertain in-domain Coupling Coefficients. We do this by combining an identifier with a backstepping-based controller and show boundedness and integrability in the ℒ 2 -sense of all signals in the closed loop system. The theory is demonstrated in a simulation.
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stabilization of linear 2 2 hyperbolic systems with uncertain Coupling Coefficients part ii swapping design
Australian Control Conference, 2016Co-Authors: Henrik Anfinsen, Ole Morten AamoAbstract:In this paper, we design a state feedback control law to adaptively stabilize a 2 × 2 linear hyperbolic system of partial differential equations (PDEs) with uncertain in-domain Coupling Coefficients. We do this using swapping design, where filters are designed so that the system states can be expressed as static, linear combinations of the filters and the uncertain parameters. Standard parameter identification methods can then be used to estimate the parameters. The adaptive observer is combined with a backstepping-based controller and boundedness in the ℒ 2 -sense of all signals in the closed loop system, as well as integrability of the system states are shown. The theory is demonstrated in a simulation.
