A. Witzig - IEEE Xplore Author Profile
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A. Witzig

Publications
13
Citations
141
Publications by Year
19992005
Co-Authors:
Show All Co-Authors (30)
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A. Witzig

Affiliation

Institut für Solartechnik SPF
Hochschule für Technik
Rapperswil, Switzerland

Publication Topics

Biography

Andreas Witzig received the Dipl.Ing. and Ph.D. degrees in electrical engineering from the Swiss Federal Institute of Technology (ETH), Zurich, Switzerland, in 1997 and 2002, respectively.,From 1995 to 1997, he worked part-time at the IBM Research Laboratory, Rüschlikon, Zurich. Currently, he is a Research Advisor and Project Leader at the Integrated Systems Laboratory, ETH Zurich. His research interests relate to computational electromagnetics and the numerical modeling of optoelectronic devices.(Based on document published on 8 December 2003).
Publications
13
Citations
141
Publications by Year
19992005
Co-Authors:
Show All Co-Authors (30)
Author's Published Works

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Study of substrate modes in a (Al,In)GaN/SiC semiconductor laser using finite element approach

V. Laino;B. Witzigmann;M. Streiff;A. Bregy;A. Witzig;U.T. Schwarz

NUSOD '05. Proceedings of the 5th International Conference on Numerical Simulation of Optoelectronic Devices, 2005.
Year: 2005 | Conference Paper |
Cited by: Patents (1)
Penetration of the waveguide mode into the substrate has some effects in Nitride-based semiconductor lasers grown on Silicon Carbide while it is usually not a problem in Arsenide-based devices. We observe oscillations in the red part of the measured gain spectrum of an (Al,In)GaN semiconductor lasers. These have been attributed to the presence of a standing wave in the substrate. We use a finite e...Show More

Study of substrate modes in a (Al,In)GaN/SiC semiconductor laser using finite element approach

V. Laino;B. Witzigmann;M. Streiff;A. Bregy;A. Witzig;U.T. Schwarz

Year: 2005 | Conference Paper |

Transfer function simulation of all-air-gap filters based on eigenmodes

F. Romer;M. Streiff;C. Prott;S. Irmer;A. Witzig;B. Witzigmann;H. Hillmer

Proceedings of the 4th International Conference on Numerical Simulation of Optoelectronic Devices, 2004. NUSOD '04.
Year: 2004 | Conference Paper |
Cited by: Papers (1)
The analysis of filter devices based on eigenmodes provides a facile and fast means to simulate the reflection and transmission function and shows good agreement with the measurements. The computing time is proportional to the number of eigenmodes, and the analysis yields an analytical expression for the transfer functions. The method can be easily applied on the analysis of geometries which are n...Show More

Transfer function simulation of all-air-gap filters based on eigenmodes

F. Romer;M. Streiff;C. Prott;S. Irmer;A. Witzig;B. Witzigmann;H. Hillmer

Year: 2004 | Conference Paper |

Microscopic opto-electro-thermal VCSEL device simulation

M. Streiff;B. Witzigmann;A. Witzig;M. Pfeiffer

Proceedings of the 4th International Conference on Numerical Simulation of Optoelectronic Devices, 2004. NUSOD '04.
Year: 2004 | Conference Paper |
Optical modes of microcavities are determined by solving Maxwell's vectorial wave equation subject to an open boundary taking radiation, diffraction effects, optical gain and absorption into account. Using a continuation scheme the optical problem is solved together with the electro-thermal device equations in a self-consistent fashion. The model is suitable for the analysis of a wide range of VCS...Show More

Microscopic opto-electro-thermal VCSEL device simulation

M. Streiff;B. Witzigmann;A. Witzig;M. Pfeiffer

Year: 2004 | Conference Paper |

Full-3D simulation of tunable multi-section DBR lasers

L. Schneider;M. Pfeiffer;A. Witzig;M. Streiff;W. Fichtner

IEEE/LEOS 3rd International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices, 2003. Proceedings
Year: 2003 | Conference Paper |
A simulation scheme which fully reflects the 3D nature of tunable multi-section distributed Bragg reflector lasers is presented. In the simulator used for this work, 3D charge carrier transport is modeled by the drift-diffusion and Poisson equations and temperature is included by balance formalism.Show More

Full-3D simulation of tunable multi-section DBR lasers

L. Schneider;M. Pfeiffer;A. Witzig;M. Streiff;W. Fichtner

Year: 2003 | Conference Paper |

A TCAD calibration methodology

V. Laino;M. Pfeiffer;A. Witzig;W. Fichtner

IEEE/LEOS 3rd International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices, 2003. Proceedings
Year: 2003 | Conference Paper |
Cited by: Papers (1)
A systematic methodology for the calibration of laser simulation environment is presented. This allows device designers to obtain good agreement between measurements and simulations in short time. The procedure is based on the laser simulator DESSIS-Laser and the TCAD environment GENESISe, which provides pre-processing, post-processing and numerical optimization tools. The device under investigati...Show More

A TCAD calibration methodology

V. Laino;M. Pfeiffer;A. Witzig;W. Fichtner

Year: 2003 | Conference Paper |

Optimization of a leaky-waveguide laser using DESSIS

A. Witzig;L. Schneider;M. Pfeiffer;M. Streiff;T. Lundstrom;P. Tikhomirov;Wei-Choon Ng;W. Fichtner

IEEE/LEOS 3rd International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices, 2003. Proceedings
Year: 2003 | Conference Paper |
The interaction of the injected carriers with the optical modes for particle and energy conservation is examined by using the commercially available device and system simulator, DESSIS. The use of DESSIS for predictive modeling in the design and optimization of high power single mode lasers is demonstrated. The device structure and design parameters including a double quantum-well active region, a...Show More

Optimization of a leaky-waveguide laser using DESSIS

A. Witzig;L. Schneider;M. Pfeiffer;M. Streiff;T. Lundstrom;P. Tikhomirov;Wei-Choon Ng;W. Fichtner

Year: 2003 | Conference Paper |

TCAD simulation of photodetector spectral response

B. Jacob;M. Klemenc;C. Petit;A. Witzig;W. Fichtner

IEEE/LEOS 3rd International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices, 2003. Proceedings
Year: 2003 | Conference Paper |
Cited by: Papers (1)
In this paper, the spectral responsivity of a photodetector is determined by extracting optical parameters (refractive index and extinction coefficients) from the reflectivity measurement data and by treating the surface recombination velocity as a free parameter. A transfer matrix method based model has been implemented to compute the optical fields within the device. The electrical simulation wa...Show More

TCAD simulation of photodetector spectral response

B. Jacob;M. Klemenc;C. Petit;A. Witzig;W. Fichtner

Year: 2003 | Conference Paper |

A comprehensive VCSEL device simulator

M. Streiff;A. Witzig;M. Pfeiffer;P. Royo;W. Fichtner

IEEE Journal of Selected Topics in Quantum Electronics
Year: 2003 | Volume: 9, Issue: 3 | Journal Article |
Cited by: Papers (52)
This paper deals with the design and implementation of a self-consistent electrothermooptical device simulator for vertical-cavity surface-emitting lasers (VCSELs). The model is based on the photon rate equation approach. For the bulk electrothermal transport, a thermodynamic model is employed in a rotationally symmetric body. Heterojunctions are modeled using a thermionic emission model and quant...Show More

A comprehensive VCSEL device simulator

M. Streiff;A. Witzig;M. Pfeiffer;P. Royo;W. Fichtner

Year: 2003 | Volume: 9, Issue: 3 | Journal Article |

Simulation and design of pump laser diodes for un-cooled applications

B. Schmidt;T. Pliska;N. Matuschek;R. Badii;S. Mohrdiek;T. Kellner;S. Pawlik;J. Muller;B. Sverdlov;A. Witzig;M. Pfeiffer

IEEE 18th International Semiconductor Laser Conference
Year: 2002 | Conference Paper |
Cited by: Papers (1)
To enable stable pump module operation at increased temperatures we have optimized our latest pump laser generation using multi-dimensional simulation tools. Poisson's equation, carrier continuity equations, and heat transport are solved self-consistently with the optical modes and the quantum-well carrier dynamics.Show More

Simulation and design of pump laser diodes for un-cooled applications

B. Schmidt;T. Pliska;N. Matuschek;R. Badii;S. Mohrdiek;T. Kellner;S. Pawlik;J. Muller;B. Sverdlov;A. Witzig;M. Pfeiffer

Year: 2002 | Conference Paper |

A multidimensional laser simulator for edge-emitters including quantum carrier capture

B. Witzigmann;A. Witzig;W. Fichtner

IEEE Transactions on Electron Devices
Year: 2000 | Volume: 47, Issue: 10 | Journal Article |
Cited by: Papers (36)
A multidimensional semiconductor laser simulator is presented which follows a rate equation approach for the coupling between optics and electronics. Capture and emission rates for the bound and free carriers are used for the quantum well. The electronic equations and the optical equations are solved in a self-consistent manner for one, two, and three dimensions. As an example, an InGaAs quantum-w...Show More

A multidimensional laser simulator for edge-emitters including quantum carrier capture

B. Witzigmann;A. Witzig;W. Fichtner

Year: 2000 | Volume: 47, Issue: 10 | Journal Article |

A full 3-dimensional quantum well laser simulation

B. Witzigmann;A. Witzig;W. Fichtner

7th International Workshop on Computational Electronics. Book of Abstracts. IWCE (Cat. No.00EX427)
Year: 2000 | Conference Paper |
In this presentation, a fully 3-dimensional laser simulator for quantum well laser diodes has been developed which is based on DESSIS/sub -ISE/. It utilizes a rate equation description for the coupling between optics and electronics. Capture and emission rates for the bound and free carriers are used for the quantum-well. The electronic and the optical equations are solved in a self-consistent man...Show More

A full 3-dimensional quantum well laser simulation

B. Witzigmann;A. Witzig;W. Fichtner

Year: 2000 | Conference Paper |

Global modeling of microwave applications by combining the FDTD method and a general semiconductor device and circuit simulator

A. Witzig;C. Schuster;P. Regli;W. Fichtner

IEEE Transactions on Microwave Theory and Techniques
Year: 1999 | Volume: 47, Issue: 6 | Journal Article |
This paper presents the coupling of two commercially available simulation codes: DESSIS-ISE, a multidimensional semiconductor device and circuit simulator, and EMLAB-ISE, an electromagnetic-field solver based on the finite-difference time-domain (FDTD) method. Full-wave electromagnetics and nonlinear devices are simulated in a coupled self-consistent way using the lumped-element approach. The acti...Show More

Global modeling of microwave applications by combining the FDTD method and a general semiconductor device and circuit simulator

A. Witzig;C. Schuster;P. Regli;W. Fichtner

Year: 1999 | Volume: 47, Issue: 6 | Journal Article |

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