Dr. Friedhelm Hopfer Profile

Dr. Friedhelm Hopfer

at Broadcom Inc

SPIE Involvement:

Author

Publications (14)

Proceedings Article | 13 March 2013 Paper

28 Gb/s 850 nm oxide VCSEL development at Avago

Jingyi Wang, Mark Keever, Zheng-Wen Feng, Thomas Fanning, Chen Chu, Aadi Sridhara, Friedhelm Hopfer, Terry Sale, An-Nien Cheng, Bing Shao, Li Ding, Pengyue Wen, Hsu-Hao Chang, Charlie Wang, David Chak Wang Hui, Laura Giovane

Proceedings Volume 8639, 86390K (2013) https://doi.org/10.1117/12.2004521

KEYWORDS: Vertical cavity surface emitting lasers, Modulation, Oxides, Temperature metrology, Eye, Reliability, Transceivers, Optics manufacturing, Data communications, Resistance

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Proceedings Article | 8 February 2011 Paper

850 nm oxide high speed VCSEL development at Avago

Jingyi Wang, Chen Ji, David Soderstrom, Tong Jian, Laura Giovane, Sumon Ray, Zheng-Wen Feng, Friedhelm Hopfer, Jeong-Ki Hwang, Terry Sale, Sumitro Joyo Taslim, Chen Chu

Proceedings Volume 7952, 795205 (2011) https://doi.org/10.1117/12.875098

KEYWORDS: Vertical cavity surface emitting lasers, Oxides, Modulation, Reliability, Temperature metrology, Transceivers, Quantum wells, Fiber optics, Standards development, Eye

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Proceedings Article | 28 April 2010 Paper

Polarization properties and instabilities of QD VCSELs

Lukasz Olejniczak, Marc Sciamanna, Hugo Thienpont, Krassimir Panajotov, Alex Mutig, Friedhelm Hopfer, Dieter Bimberg

Proceedings Volume 7720, 77201G (2010) https://doi.org/10.1117/12.854459

KEYWORDS: Polarization, Vertical cavity surface emitting lasers, Switching, Quantum wells, Polarizers, Modulation, Semiconducting wafers, Switches, Quantum dots, Anisotropy

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Proceedings Article | 27 April 2010 Paper

High-speed 850-nm VCSELs for 40-Gb/s transmission

Johan Gustavsson, Petter Westbergh, Krzysztof Szczerba, Åsa Haglund, Anders Larsson, Magnus Karlsson, Peter Andrekson, Friedhelm Hopfer, Gerrit Fiol, Dieter Bimberg, Bengt-Erik Olsson, A. Kristiansson, Sorcha Healy, Eoin O'Reilly, Andrew Joel

Proceedings Volume 7720, 772002 (2010) https://doi.org/10.1117/12.854516

KEYWORDS: Temperature metrology, Curium, Mirrors, Quantum wells, Etching, Resistance, Capacitance, Modulation, Oxides, Vertical cavity surface emitting lasers

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Proceedings Article | 24 February 2009 Paper

20 Gbit/s error free transmission with ~850 nm GaAs-based vertical cavity surface emitting lasers (VCSELs) containing InAs-GaAs submonolayer quantum dot insertions

J. Lott, V. Shchukin, N. Ledentsov, A. Stinz, F. Hopfer, A. Mutig, G. Fiol, D. Bimberg, S. Blokhin, L. Karachinsky, I. Novikov, M. Maximov, N. Zakharov, P. Werner

Proceedings Volume 7211, 721114 (2009) https://doi.org/10.1117/12.816947

KEYWORDS: Vertical cavity surface emitting lasers, Semiconducting wafers, Quantum wells, Indium arsenide, Gallium arsenide, Quantum dots, Optical microcavities, Telecommunications, Modulation, Indium gallium arsenide

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Proceedings Article | 18 February 2009 Paper

Quantum dot insertions in VCSELs from 840 to 1300 nm: growth, characterization, and device performance

N. Ledentsov, J. Lott, V. Shchukin, H. Quast, F. Hopfer, G. Fiol, A. Mutig, P. Moser, T. Germann, A. Strittmatter, L. Karachinsky, S. Blokhin, I. Novikov, A. Nadtochi, N. Zakharov, P. Werner, D. Bimberg

Proceedings Volume 7224, 72240P (2009) https://doi.org/10.1117/12.810192

KEYWORDS: Vertical cavity surface emitting lasers, Modulation, Indium arsenide, Eye, Quantum dots, Transmission electron microscopy, Frequency conversion, Multimode fibers, Copper

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Proceedings Article | 7 February 2009 Paper

120°C 20 Gbit/s operation of 980nm VCSEL based on sub-monolayer growth

Friedhelm Hopfer, Alex Mutig, Gerrit Fiol, Phillip Moser, Dejan Arsenijevic, Vitaly Shchukin, Nikolai Ledentsov, Sergey Mikhrin, Igor Krestnikov, Daniel Livshits, Alexey Kovsh, Matthias Kuntz, Dieter Bimberg

Proceedings Volume 7229, 72290C (2009) https://doi.org/10.1117/12.813064

KEYWORDS: Modulation, Vertical cavity surface emitting lasers, Temperature metrology, Indium gallium arsenide, Resistance, Semiconductor lasers, Quantum wells, Oxides, Detection theory, Signal analysis

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Proceedings Article | 5 March 2008 Paper

Quantum dot photonics: edge emitter amplifier, and VCSEL

F. Hopfer, M. Kuntz, M. Lämmlin, G. Fiol, N. Ledentsov, A. Kovsh, S. Mikrin, I. Kaiander, V. Haisler, A. Lochmann, A. Mutig, C. Schubert, A. Umbach, V. Ustinov, U. Pohl, D. Bimberg

Proceedings Volume 7009, 700902 (2008) https://doi.org/10.1117/12.793286

KEYWORDS: Vertical cavity surface emitting lasers, Picosecond phenomena, Modulation, Quantum dots, Mode locking, Semiconductor lasers, Pulsed laser operation, Indium gallium arsenide, Eye

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Proceedings Article | 22 February 2008 Paper

Ultra high-speed electro-optically modulated VCSELs: modeling and experimental results

V. Shchukin, N. Ledentsov, J. Lott, H. Quast, F. Hopfer, L. Ya. Karachinsky, M. Kuntz, P. Moser, A. Mutig, A. Strittmatter, V. Kalosha, D. Bimberg

Proceedings Volume 6889, 68890H (2008) https://doi.org/10.1117/12.784371

KEYWORDS: Vertical cavity surface emitting lasers, Modulators, Absorption, Modulation, Electro optics, Quantum wells, Reflectivity, Excitons, Refractive index, Mirrors

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Proceedings Article | 7 February 2007 Paper

Novel concepts for ultrahigh-speed quantum-dot VCSELs and edge-emitters

N. Ledentsov, F. Hopfer, A. Mutig, V. Shchukin, A. V. Savel'ev, G. Fiol, M. Kuntz, V. A. Haisler, T. Warming, E. Stock, S. S. Mikhrin, A. R. Kovsh, C. Bornholdt, H. Eisele, M. Dähne, N. D. Zakharov, P. Werner, D. Bimberg

Proceedings Volume 6468, 64681O (2007) https://doi.org/10.1117/12.717248

KEYWORDS: Vertical cavity surface emitting lasers, Modulation, Modulators, Refractive index, Electro optics, Indium arsenide, Gallium arsenide, Transmission electron microscopy, Continuous wave operation

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Proceedings Article | 6 July 2006 Paper

Self organized quantum dots for 1.3 µm photonic devices

M. Laemmlin, G. Fiol, C. Meuer, M. Kuntz, F. Hopfer, N. Ledentsov, A. Kovsh, D. Bimberg

Proceedings Volume 6350, 63500M (2006) https://doi.org/10.1117/12.692912

KEYWORDS: Mode locking, Quantum dots, Modulation, Picosecond phenomena, Optical amplifiers, Semiconductor lasers, Pulsed laser operation, Eye, Laser optics, Ultrafast phenomena

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Proceedings Article | 6 July 2006 Paper

Electrically pumped InAs single quantum dot emitter

A. Lochmann, E. Stock, O. Schulz, F. Hopfer, D. Bimberg, V. Haisler, A. Toropov, A. Bakarov, A. Kalagin, M. Scholz, S. Büttner, O. Benson

Proceedings Volume 6350, 63500F (2006) https://doi.org/10.1117/12.692764

KEYWORDS: Excitons, Indium arsenide, Oxides, Quantum dots, Single photon, Aluminum, Photons, Electroluminescence, Gallium arsenide, Oxidation

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Proceedings Article | 6 July 2006 Paper

20-Gb/s direct modulation of 980 nm VCSELs based on submonolayer deposition of quantum dots

F. Hopfer, A, Mutig, G. Fiol, M. Kuntz, S. Mikhrin, I. Krestnikov, D. Livshits, A. Kovsh, C. Bornholdt, V. Shchukin, N. Ledentsov, V. Gaysler, N. Zakharov, P. Werner, D. Bimberg

Proceedings Volume 6350, 635003 (2006) https://doi.org/10.1117/12.693006

KEYWORDS: Modulation, Vertical cavity surface emitting lasers, Quantum dots, Indium arsenide, Gallium arsenide, Eye, Indium gallium arsenide, Quantum wells, Transmission electron microscopy, Gallium

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Proceedings Article | 31 January 2005 Paper

QD lasers: physics and applications

Nikolai Ledentsov, Alexey Kovsh, Vitaly Shchukin, Sergey Mikhrin, Igor Krestnikov, A. Kozhukhov, Leonid Karachinsky, Mikhail Maximov, Innokenty Novikov, Yuri Shernyakov, Ilja Soshnikov, Alexey Zhukov, Efim Portnoi, Victor Ustinov, D. Gerthsen, Pallab Bhattacharya, N. Zakharov, P. Werner, Friedhelm Hopfer, Matthias Kuntz, Dieter Bimberg

Proceedings Volume 5624, (2005) https://doi.org/10.1117/12.570284

KEYWORDS: Gallium arsenide, Semiconductor lasers, Vertical cavity surface emitting lasers, Indium arsenide, Annealing, Quantum dots, Laser stabilization, Transmission electron microscopy, Heterojunctions, Indium gallium arsenide

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Showing 5 of 14 publications

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