Prof. Wolfgang Freude Profile

Prof. Wolfgang Freude

Professor at Karlsruhe Institute of Technology

SPIE Involvement:

Author

Area of Expertise:

Photonics , Optical Communications , Integrated Optics

Publications (18)

Proceedings Article | 5 March 2022 Presentation

Silicon organic hybrid (SOH) and silicon-nitride-organic hybrid (SiNOH) integration: From electro-optic modulators to visible-wavelength lasers

Christian Koos, Wolfgang Freude, Daria Kohler, Johannes Milvich, Clemens Kieninger, Heiner Zwickel

Proceedings Volume PC12004, PC120040B (2022) https://doi.org/10.1117/12.2612836

KEYWORDS: Silicon, Semiconductor lasers, Hybrid silicon lasers, Electrooptic modulators, Waveguides, Cladding, Point-of-care devices, Photonic integrated circuits, Optical properties, Near infrared

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Proceedings Article | 22 February 2017 Paper

Nanophotonic modulators and photodetectors using silicon photonic and plasmonic device concepts

C. Koos, W. Freude, J. Leuthold, L. Dalton, S. Wolf, S. Muehlbrandt, A. Melikyan, H. Zwickel, T. Harter, Y. Kutuvantavida, C. Kieninger, M. Lauermann, D. Elder

Proceedings Volume 10098, 1009807 (2017) https://doi.org/10.1117/12.2256536

KEYWORDS: Nanophotonics, Modulators, Photodetectors, Silicon photonics, Plasmonics, Waveguides, Silicon, Optical interconnects, Electronic circuits, Data communications, Electro optics, Electrooptic modulators, Energy efficiency, Modulation

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Proceedings Article | 20 February 2017 Paper

Chip-scale frequency comb generators for high-speed communications and optical metrology

C. Koos, T. Kippenberg, L. Barry, A. Ramdane, F. Lelarge, W. Freude, P. Marin, J. Kemal, C. Weimann, S. Wolf, P. Trocha, J. Pfeifle, M. Karpov, A. Kordts, V. Brasch, R. Watts, V. Vujicic, A. Martinez, V. Panapakkam, N. Chimot

Proceedings Volume 10090, 100900G (2017) https://doi.org/10.1117/12.2256465

KEYWORDS: Microresonators, Frequency combs, RF photonics, Optical communications, Optical metrology, Solitons, Semiconductor lasers, Wavelength division multiplexing, Metrology, Photonic integrated circuits, Receivers, Photonics

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Proceedings Article | 5 October 2015 Presentation

Second-harmonic generation from atomic-scale ABC-type laminate optical metamaterials (Presentation Recording)

Luca Alloatti, Clemens Kieninger, Andreas Frölich, Matthias Lauermann, Tobias Frenzel, Kira Köhnle, Wolfgang Freude, Juerg Leuthold, Christian Koos, Martin Wegener

Proceedings Volume 9544, 95440Y (2015) https://doi.org/10.1117/12.2187154

KEYWORDS: Metamaterials, Second-harmonic generation, Optical metamaterials, Dielectrics, Nonlinear optics, Interfaces, Frequency conversion, Electro optics, Modulation, Silicon photonics

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Proceedings Article | 1 May 2015 Paper

High-speed and low-power silicon-organic hybrid modulators for advanced modulation formats

M. Lauermann, S. Wolf, R. Palmer, S. Koeber, P. Schindler, T. Wahlbrink, J. Bolten, A. Giesecke, M. Koenigsmann, M. Kohler, D. Malsam, D. Elder, L. Dalton, J. Leuthold, W. Freude, C. Koos

Proceedings Volume 9516, 951607 (2015) https://doi.org/10.1117/12.2180179

KEYWORDS: Modulators, Silicon, Modulation, Waveguides, Forward error correction, Electro optics, Signal generators, Chromophores, Transmitters, Optical amplifiers

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Proceedings Article | 3 March 2015 Paper

Terabit/s communications using chip-scale frequency comb sources

Christian Koos, Tobias Kippenberg, Liam Barry, Larry Dalton, Wolfgang Freude, Juerg Leuthold, Joerg Pfeifle, Claudius Weimann, Matthias Lauermann, Juned Kemal, Robert Palmer, Sebastian Koeber, Philipp Schindler, Tobias Herr, Victor Brasch, Regan Watts, Delwin Elder

Proceedings Volume 9343, 93430E (2015) https://doi.org/10.1117/12.2087572

KEYWORDS: Frequency combs, Modulation, Silicon, Wavelength division multiplexing, Data transmission, Polarization, Optical amplifiers, Modulators, Phase shift keying, Electro optics

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Proceedings Article | 6 March 2014 Paper

Three-dimensional two-photon lithography: an enabling technology for photonic wire bonding and multi-chip integration

C. Koos, W. Freude, N. Lindenmann, S. Koeber, T. Hoose, M. Billah

Proceedings Volume 8970, 897008 (2014) https://doi.org/10.1117/12.2044327

KEYWORDS: Waveguides, Lithography, Silicon, Interfaces, Optical alignment, Photonics systems, Wave propagation, Optical fibers, Prototyping, Integrated optics

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Proceedings Article | 1 February 2014 Paper

Pulse-shaping for spectrally-efficient coherent optical networks: OFDM, Nyquist signaling, and DFT-spread OFDM

R. Schmogrow, P. Schindler, C. Koos, W. Freude, J. Leuthold

Proceedings Volume 9009, 900909 (2014) https://doi.org/10.1117/12.2044388

KEYWORDS: Orthogonal frequency division multiplexing, Optical filters, Signal processing, Electronic filtering, Modulation, Finite impulse response filters, Filtering (signal processing), Modulators, Digital signal processing, Optical communications

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Proceedings Article | 14 March 2013 Paper

Silicon-organic hybrid devices

L. Alloatti, D. Korn, J. Pfeifle, R. Palmer, S. Koeber, M. Baier, R. Schmogrow, Sebastian Diebold, P. Pahl, T. Zwick, H. Yu, W. Bogaerts, R. Baets, M. Fournier, J. Fedeli, R. Dinu, C. Koos, W. Freude, J. Leuthold

Proceedings Volume 8629, 86290P (2013) https://doi.org/10.1117/12.2005866

KEYWORDS: Silicon, Waveguides, Modulators, Modulation, Liquid crystals, Phase shifts, Nonlinear optics, Electrodes, Silicon photonics, Cladding

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Proceedings Article | 5 March 2013 Paper

Photonic wire bonding: connecting nanophotonic circuits across chip boundaries

C. Koos, J. Leuthold, W. Freude, N. Lindenmann, S. Koeber, G. Balthasar, J. Hoffmann, T. Hoose, P. Huebner, D. Hillerkuss, R. Schmogrow

Proceedings Volume 8613, 86130W (2013) https://doi.org/10.1117/12.2003096

KEYWORDS: Waveguides, Nanophotonics, Wavelength division multiplexing, Silicon, Two photon polymerization, Modulation, Prototyping, Data transmission, Single mode fibers, Silicon photonics

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Proceedings Article | 22 February 2013 Paper

Terabit/s data transmission using optical frequency combs

C. Koos, J. Leuthold, W. Freude, T. Kippenberg, J. Pfeifle, C. Weimann, K. Hartinger, V. Brasch, T. Herr, R. Holzwarth, D. Hillerkuss, R. Schmogrow

Proceedings Volume 8600, 860009 (2013) https://doi.org/10.1117/12.2003701

KEYWORDS: Frequency combs, Data transmission, Modulation, Wavelength division multiplexing, Transmitters, Microresonators, Polarization, Receivers, Silicon, Mode locking

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Proceedings Article | 2 February 2012 Paper

Loss reduction of silicon slot waveguides with ALD grown thin films

A. Säynätjoki, L. Karvonen, T. Alasaarela, D. Korn, L. Alloatti, A. Tervonen, R. Palmer, C. Koos, J. Leuthold, W. Freude, S. Honkanen

Proceedings Volume 8266, 82660D (2012) https://doi.org/10.1117/12.908640

KEYWORDS: Waveguides, Atomic layer deposition, Silicon, Silicon films, Thin films, Wave propagation, Thin film growth, Lithography, Silicon photonics, Titanium dioxide

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Proceedings Article | 25 January 2012 Paper

Reconfigurable optical transmitters and receivers

Wolfgang Freude, René Schmogrow, David Hillerkuss, Joachim Meyer, Michael Dreschmann, Bernd Nebendahl, Michael Huebner, Juergen Becker, Christian Koos, Juerg Leuthold

Proceedings Volume 8284, 82840A (2012) https://doi.org/10.1117/12.914239

KEYWORDS: Orthogonal frequency division multiplexing, Transmitters, Modulation, Receivers, Field programmable gate arrays, Digital signal processing, Signal processing, Surface plasmons, Forward error correction, Binary data

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Proceedings Article | 26 February 2010 Paper

Saturation characteristics of InGaAsP-InP bulk SOA

Amita Kapoor, Enakshi Sharma, Wolfgang Freude, Juerg Leuthold

Proceedings Volume 7597, 75971I (2010) https://doi.org/10.1117/12.842350

KEYWORDS: Doping, Optical amplifiers, Semiconductor lasers, Amplifiers, Absorption, Optical simulations, Mirrors, Semiconductor optical amplifiers, Reflectivity, Photonics

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Semiconductor optical amplifiers (SOAs) can be used as linear in-line amplifiers for extended-reach passive optical networks, or as gain/phase-switchable devices. For these applications, gain, bandwidth and saturation power are important. The saturation power can be increased by decreasing the confinement factor and by increasing the length such that the overall gain remains constant. In this paper we investigate the saturation characteristics of 1.55μm InGaAsP-InP bulk SOA. We do so by using the physically based simulation tool ATLAS. The simulation tool ATLAS supports simulation of semiconductor lasers only, however making the mirror reflectivities small, the lasing threshold is increased such that lasers are essentially reduced to amplifiers. Next, for investigating the saturation characteristics of SOA, the amplifier gain should be influenced by injecting an optical light power. However, ATLAS cannot simulate the required source directly. Instead, we use in the electron rate equation simultaneously two competing independent models for spontaneous radiative recombination, namely the so-called general model (total recombination rate Bn_{T p} with bimolecular recombination coefficient B, electron and hole concentrations n_T and p) and the standard model for recombination due to amplified spontaneous emission into the mode under consideration (determined by the product of Fermi functions for electrons and holes). In the photon rate equation, only the standard model is used. We then increase B, and thus simulate a decrease of the carrier concentration that would physically result from an external optical signal. We show that under conditions of constant injection current and device length an n-doping (p-doping) of the active layer increases (decreases) the input saturation power. In addition we observe that for constant injection current and amplifier gain, a p-doping (n-doping) of the active layer increases (decreases) both the input and output saturation powers because of an reduced (slightly increased) Auger-dominated carrier lifetime.

Proceedings Article | 23 January 2010 Paper

All-optical grooming for 100 Gbit/s ethernet

J. Leuthold, R. Bonk, P. Vorreau, S. Sygletos, D. Hillerkuss, W. Freude, G. Zarris, D. Simeonidou, C. Kouloumentas, M. Spyropoulou, I. Tomkos, F. Parmigiani, P. Petropoulos, D. Richardson, R. Weerasuriya, S. Ibrahim, A. Ellis, R. Morais, P. Monteiro, S. Ben Ezra, S. Tsadka

Proceedings Volume 7621, 762107 (2010) https://doi.org/10.1117/12.849029

KEYWORDS: Switches, Eye, Switching, Microelectromechanical systems, Clocks, Wavelength division multiplexing, Scanning probe microscopy, Modulation, Optical networks, Optical switching

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Proceedings Article | 18 November 2008 Paper

All-optical SOA-based wavelength converter assisted by optical filters with wide operation wavelength and large dynamic input power range

J. Li, J. Wang, A. Marculescu, P. Vorreau, Z. Zhang, W. Freude, J. Leuthold

Proceedings Volume 7135, 713525 (2008) https://doi.org/10.1117/12.803457

KEYWORDS: Optical filters, Electronic filtering, Eye, Data conversion, Tolerancing, Nonlinear optics, Semiconductor optical amplifiers, Networks, Bandpass filters

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Proceedings Article | 3 October 2006 Paper

All-optical signal processing for phase-sensitive modulation formats

J. Leuthold, W. Freude, G. Boettger, J. Wang, A. Marculescu, P. Vorreau

Proceedings Volume 6353, 635311 (2006) https://doi.org/10.1117/12.693011

KEYWORDS: Computer programming, Phase shift keying, Modulation, Transmitters, Eye, Signal detection, All optical signal processing, Receivers, Clocks, Semiconductor optical amplifiers

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Proceedings Article | 28 April 1999 Paper

Microwave photonics for broadband wireless access

Wolfgang Freude, Guy-Aymar Chakam, Volker Hurm

Proceedings Volume 3666, (1999) https://doi.org/10.1117/12.347925

KEYWORDS: Antennas, Phased array optics, Near field optics, Modulation, Microwave photonics, Optical networks, Microwave radiation, Dielectrics, Optical arrays, Near field

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Showing 5 of 18 publications

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