Prof. Kevin A. Williams Profile

Prof. Kevin A. Williams

Professor at Technische Univ Eindhoven

SPIE Involvement:

Conference Program Committee | Author

Publications (32)

Proceedings Article | 30 May 2022 Presentation

JePPIX: InP photonic integrated circuits for accelerated product development

Kevin Williams

Proceedings Volume PC12148, PC121480A (2022) https://doi.org/10.1117/12.2631226

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Proceedings Article | 4 March 2022 Presentation + Paper

Control strategy for a monolithically integrated widely tunable laser system on InP for optical coherence tomography

Joel Hazan, Tancrede Couka, Rastko Pajkovic, Kevin Williams, Erwin Bente

Proceedings Volume 12021, 120210A (2022) https://doi.org/10.1117/12.2610120

KEYWORDS: Optical filters, Optical coherence tomography, Calibration, Tunable lasers, Electronic filtering, Laser systems engineering, Laser resonators, Modulators, Output couplers, Laser development

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Proceedings Article | 5 March 2021 Presentation + Paper

The path to 1Tb/s and beyond datacenter interconnect networks: technologies, components, and subsystems

Maria Spyropoulou, Giannis Kanakis, Yuqing Jiao, Ripalta Stabile, Nicola Calabretta, Kevin Williams, Virginie Nodjiadjim, Romain Hersent, Agnieszka Konczykowska, Richard Schatz, Oskars Ozolins, Jakub Zvěřina, Martin Žoldák, Paraskevas Bakopoulos, Giannis Patronas, Hercules Avramopoulos, Mahdieh Joharifar

Proceedings Volume 11712, 117120G (2021) https://doi.org/10.1117/12.2582920

KEYWORDS: Transceivers, Switches, Optical components, Electronics, Wafer bonding, Standards development, Photonic integrated circuits, Multiplexing, Internet, Integrated optics

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Proceedings Article | 27 July 2020 Open Access

Dynamic properties of wavelength switching in a widely tunable semiconductor laser for optical coherence tomography (Erratum)

Rastko Pajković, Daniel Garbi, Kevin Williams, Erwin Bente

Proceedings Volume 11356, 113561F (2020) https://doi.org/10.1117/12.2579913

KEYWORDS: Semiconductor lasers, Switching, Optical coherence tomography

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Proceedings Article | 1 April 2020 Presentation + Paper

Dynamic properties of wavelength switching in a widely tunable semiconductor laser for optical coherence tomography

Rastko Pajković, Erwin Bente, Kevin Williams, Daniel Garbi

Proceedings Volume 11356, 113560I (2020) https://doi.org/10.1117/12.2555620

KEYWORDS: Switching, Optical coherence tomography, Optical simulations, Optical filters, Semiconductor lasers, Tunable lasers, Modulators, Electronics, Optical amplifiers

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Proceedings Article | 2 March 2020 Presentation + Paper

Monolithically integrated laser sources for applications beyond telecommunications

S. Latkowski, E. A. J. M. Bente, K. Williams

Proceedings Volume 11274, 112741N (2020) https://doi.org/10.1117/12.2552784

KEYWORDS: Tunable lasers, Mode locking, Laser sources, Photonic integrated circuits, Semiconductor lasers, Laser development, Optical filters, Laser resonators, Telecommunications, Standards development

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Proceedings Article | 12 April 2019 Presentation + Paper

High-speed energy-efficient InP photonic integrated circuit transceivers

K. Williams, V. Rustichelli, H. P. M. Ambrosius, X. J. Leijtens, M. Trajkovic, F. Lemaître

Proceedings Volume 10924, 1092411 (2019) https://doi.org/10.1117/12.2515218

KEYWORDS: Photonic integrated circuits, Modulation, Tunable lasers, Heterojunctions, Modulators, Waveguides, Laser damage threshold, Integrated optics, Optical amplifiers, Strontium vapor lasers

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Proceedings Article | 1 March 2019 Presentation + Paper

Tuning of a widely tunable monolithically integrated InP laser for optical coherence tomography

Yu Tian, Rastko Pajković, Sylwester Latkowski, Kevin Williams, Erwin Bente

Proceedings Volume 10939, 1093912 (2019) https://doi.org/10.1117/12.2509572

KEYWORDS: Calibration, Modulators, Optical coherence tomography, Tunable lasers, Optical filters, Photonic integrated circuits, Phase modulation, Wavelength tuning

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Proceedings Article | 23 February 2018 Presentation + Paper

Thermal comparison of buried-heterostructure and shallow-ridge lasers

F. Lemaître, V. Rustichelli, H. P. M. Ambrosius, R. Brenot, K. Williams

Proceedings Volume 10526, 105261E (2018) https://doi.org/10.1117/12.2289596

KEYWORDS: Resistance, Heat flux, Finite element methods, Waveguides, Continuous wave operation, Heatsinks, Interfaces, Optical simulations, Thermal effects

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Proceedings Article | 20 February 2017 Paper

Mode-locked lasers in InP photonic integrated circuits

Erwin Bente, Sylwester Latkowski, Valentina Moskalenko, Mònica Llorens-Revul, Kevin Williams, Saeed Tahvili

Proceedings Volume 10123, 101230F (2017) https://doi.org/10.1117/12.2251469

KEYWORDS: Mode locking, Laser applications, Semiconductor lasers, Frequency combs, Pulsed laser operation, Photonic integrated circuits, Waveguides, Laser stabilization, Standards development, Optical amplifiers

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Proceedings Article | 16 February 2017 Presentation + Paper

Monolithic photonic integration technology platform and devices at wavelengths beyond 2µm for gas spectroscopy applications

S. Latkowski, P. van Veldhoven, A. Hänsel, D. D’Agostino, H. Rabbani-Haghighi, B. Docter, N. Bhattacharya, P. J. Thijs, H. P. M. Ambrosius, M. Smit, K. Williams, E. A. J. Bente

Proceedings Volume 10106, 101060Q (2017) https://doi.org/10.1117/12.2256604

KEYWORDS: Tunable lasers, Photonic integrated circuits, Semiconductor lasers, Laser spectroscopy, Integrated optics, Quantum wells, Semiconducting wafers, Absorption, Waveguides, Spectroscopy, Optical filters

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Proceedings Article | 8 March 2014 Paper

Advances in integrated photonic circuits for packet-switched interconnection

Kevin Williams, Ripalta Stabile

Proceedings Volume 8991, 899117 (2014) https://doi.org/10.1117/12.2040691

KEYWORDS: Switches, Semiconductor optical amplifiers, Optical switching, Switching, Waveguides, Photonic integrated circuits, Integrated circuits, Integrated circuit design, Prototyping, Integrated optics

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Proceedings Article | 12 February 2008 Paper

Waferbonded active/passive vertically coupled microring lasers

C. W. Tee, A. Kapsalis, M. Hamacher, V. Dragoi, U. Troppenz, D. Syvridis, M. Kusko, K. Williams, D. Alexandropoulos, D. Cristea, M. Alexe, H. Heidrich, S. Mikroulis

Proceedings Volume 6896, 68960R (2008) https://doi.org/10.1117/12.762507

KEYWORDS: Semiconducting wafers, Waveguides, Resonators, Wafer bonding, Microrings, Gallium arsenide, Laser bonding, Modulation, Optical alignment, Photomasks

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Proceedings Article | 28 September 2006 Paper

High capacity interconnection networks

Tao Lin, Ian White, Adrian Wonfor, Madeleine Glick, Richard Penty, Kevin Williams, E. Aw, Michael Dales

Proceedings Volume 6354, 63542F (2006) https://doi.org/10.1117/12.691289

KEYWORDS: Switches, Optical switching, Networks, Control systems, Interfaces, Switching, Field programmable gate arrays, Optical interconnects, Calibration, Network architectures

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Proceedings Article | 20 April 2006 Paper

Optimal design parameters research for novel monolithically integrated non-linear all-optical loop mirror for signal regeneration

I. White, E. Moll, R. Penty, K. Williams

Proceedings Volume 6183, 618318 (2006) https://doi.org/10.1117/12.662977

KEYWORDS: Mirrors, Waveguides, Quantum wells, Reflectivity, Nonlinear optics, Remote sensing, Optics manufacturing, Phase shifts, Computer simulations, Refractive index

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We propose a device based on self-induced phase shifting to create a non-linear optical transfer function with a single optical access. The device is designed around the Nonlinear-Optical Loop Mirror (NOLM) principle. The device is a loop formed by four SOAs with a splitter/recombiner at one of the junctions for optical access. The device also includes a mirror inside one of the SOAs such that part of the light is transmitted around the loop and part is reflected. The dimensions of formed loop are kept below 4mm (1mm/SOA) to the requirement for integration. It is assumed the loop is based on a standard ridge waveguide design with InGaAsP/InGaAs quantum wells yielding a refractive index of 3.88. Also, the width of the waveguide is kept constant at 2μm to ensure single-moded operation. We present simulations results obtained with VPITransmissionMakerTM from VPIPhotonics. The software allows the simulation of optical modules such as Lasers, SOAs, Bragg Grating. The SOA and Laser modules exploit on the Transmission Line Laser Model (TLLM) model for solving the standard laser rate equations. For the Multi-Quantum Wells (MQW) SOAs, another set of equations are used to model the effects of carriers entering and exiting the quantum wells. The model is used to explore the tunability of the design and manufacturing parameters for optimal performance of the non-linear optical loop mirror. Design parameters include the size of the loop, drive current of each SOA, position and reflectivity of the mirror, number and size of the quantum wells and separate confinement height. To provide an efficient way of comparing different values for a given parameter, three figures of merits are chosen. The first one is the input dynamic range of the device in its current configuration, which corresponds to the area of the transfer function where the input signal will experience regeneration. The second parameter is the peak to trough ratio corresponding to the maximum possible output swing i.e. the maximum point of the transfer function less its corresponding minima. The final parameter named the regeneration slope is the division of the peak to trough ration by the input dynamic range. The particularity of this loop is the mirror etched into one of the active waveguides to create self-induced phase shifts leading to non-linear transfer functions with a single optical input. Optimisation is explored for various design parameters that would need to be decided prior to manufacturing such a device. It is believed that such optimisation can provide a way to create all-optical signal processing devices created for a single application.

Proceedings Article | 14 April 2006 Paper

IPDR improvement and gain reduction in a beam holding SOA

Jinyong Ha, Richard Penty, Ian White, Kevin Williams, Madeleine Glick

Proceedings Volume 6184, 61840Q (2006) https://doi.org/10.1117/12.662875

KEYWORDS: Distortion, Switching, Optical amplifiers, Semiconductor optical amplifiers, Semiconductor lasers, Phase modulation, Carrier dynamics, Integrated optics, Packet switching, Polarization

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Proceedings Article | 15 February 2006 Paper

Monolithic integration of collimating Fresnel lens for beam quality enhancement in tapered high power laser diode

Michel Krakowski, Michel Calligaro, Michel Lecomte, Chyng Wen Tee, Ian White, Fat Kit Lau, Richard Penty, Olivier Parillaud, Xin Zhao, Kevin Williams, Nicolas Michel

Proceedings Volume 6104, 61040L (2006) https://doi.org/10.1117/12.648047

KEYWORDS: Semiconductor lasers, Etching, Near field, Laser resonators, Fresnel lenses, High power lasers, Diodes, Lens design, Near field optics, Monochromatic aberrations

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Proceedings Article | 4 April 2005 Paper

Optimization of twin-contact semiconductor optical amplifiers for use in integrated interferometric devices

Yew Jun Chai, Emmanuel Moll, Richard Penty, Ian White, Kevin Williams

Proceedings Volume 5723, (2005) https://doi.org/10.1117/12.593279

KEYWORDS: Phase shifts, Interferometry, Semiconductor optical amplifiers, Switching, Optical amplifiers, Optics manufacturing, Instrument modeling, Systems modeling, Integrated optics, Optical components

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Proceedings Article | 25 October 2004 Paper

Novel single-mode laser operation using 2D photonic crystal

Dae-Joon Kang, Y. Chu, Yu-Chen Yu, Peter Bennett, Y. Huang, Yi-Xiong Lin, Richard Penty, Kevin Williams, Mark Blamire, Ian White, Xin Zhao

Proceedings Volume 5595, (2004) https://doi.org/10.1117/12.581379

KEYWORDS: Photonic crystals, Etching, Semiconductor lasers, Waveguides, Diffraction gratings, Refractive index, Fabry–Perot interferometers, Diffraction, Reflectivity, 3D modeling

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Proceedings Article | 1 September 2004 Paper

Mode locking of InGaAs quantum dot lasers

Dongxun Ouyang, Victor Ustinov, Alexey Kovsh, Kevin Williams, Ilia Kaiander, Nikolai Ledentsov, Dieter Bimberg, Ian White, Mark Blamire, Claudio Marinelli, Stephan Hansmann, Dae-Joon Kang, Stephan Jochum, Alexey Zhukov, Franz Visinka, Kay Tan, Richard Penty, Roman Sellin, Mark Thompson, Matthias Kuntz

Proceedings Volume 5452, (2004) https://doi.org/10.1117/12.545749

KEYWORDS: Mode locking, Oscilloscopes, Pulsed laser operation, Semiconductor lasers, Etching, Gallium, Quantum dot lasers, Quantum dots, Waveguides, Fourier transforms

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Proceedings Article | 1 September 2004 Paper

Characterization of 1550 nm Fabry-Perot laser structures for application as mode-locked pulse sources

Kevin Williams, M. Peltola, M. Cavallari, H. Lamela, Markus Pessa, P. Moreno, A. Rydefalk, S. Garidel, H. Scholl, Wei Li, Risto Ronkko

Proceedings Volume 5452, (2004) https://doi.org/10.1117/12.543908

KEYWORDS: Quantum wells, Mode locking, Pulsed laser operation, Semiconductor lasers, External quantum efficiency, Picosecond phenomena, Waveguide lasers, Fabry–Perot interferometers, Laser damage threshold, Waveguides

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Proceedings Article | 18 August 2004 Paper

Multiwavelength optical add-drop multiplexer with nanosecond reconfiguration times for local area networking

Kevin Williams, Guy Roberts, Jeremy Sosabowski, Derek McAuley, Madeleine Glick, Richard Penty, Ian White

Proceedings Volume 5451, (2004) https://doi.org/10.1117/12.545689

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Proceedings Article | 9 July 2004 Paper

Novel polarization selector based on an active waveguide photonic bandgap structure

Ian White, Peter Bennett, Mark Silver, Antonios Atlasis, Xin Zhao, Richard Penty, Kevin Williams, Christopher Morgan

Proceedings Volume 5360, (2004) https://doi.org/10.1117/12.530700

KEYWORDS: Polarization, Waveguides, Photonic crystals, Crystals, Reflectivity, Photon polarization, Photonic crystal devices, Etching, Ion beams, Laser crystals

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Proceedings Article | 11 May 2004 Paper

Mode-locked quantum dot lasers for picosecond pulse generation

Kevin Williams, Stephan Jochum, Mark Thompson, Dieter Bimberg, Ilia Kaiander, Nikolai Ledentsov, Kay Ti Tan, Matthias Kuntz, Roman Sellin, Franz Visinka, Claudio Marinelli, Dae-Joon Kang, A. Kovsh, Stephan Hansmann, V. Ustinov, Dongxun Ouyang, Ian White, Mark Blamire, Richard Penty, A. Zhukov, Matthias Laemmlin

Proceedings Volume 5365, (2004) https://doi.org/10.1117/12.531284

KEYWORDS: Mode locking, Quantum dot lasers, Pulsed laser operation, Etching, Picosecond phenomena, Oscilloscopes, Semiconductor lasers, Quantum dots, Gallium, Spectrum analysis

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Proceedings Article | 8 December 2003 Paper

Optical local area networking using CWDM

Ian White, Kevin Williams, Judith Hankey, G. Roberts, M. Glick, Richard Penty, D. McAuley

Proceedings Volume 5248, (2003) https://doi.org/10.1117/12.514661

KEYWORDS: Coarse wavelength division multiplexing, Wavelength division multiplexing, Networks, Local area networks, Switches, Standards development, Switching, Telecommunications, Control systems, Waveguides

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SPIE Journal Paper | 1 March 2003

Tapered waveguide with parabolic lens: theory and experiment

Atef Rashed, Kevin Williams, Peter Heard, Richard Penty, Ian White

OE, Vol. 42, Issue 03, (March 2003) https://doi.org/10.1117/12.10.1117/1.1541621

KEYWORDS: Waveguides, Etching, Near field, Refractive index, Semiconductor lasers, Lens design, Wave propagation, Diodes, Waveguide lasers, Near field optics

Proceedings Article | 9 July 2001 Paper

Finite difference beam propagation model for tapered waveguide with intracavity lens

Ian White, Kevin Williams, Atef Rashed, Richard Penty

Proceedings Volume 4283, (2001) https://doi.org/10.1117/12.432613

KEYWORDS: Waveguides, Wave propagation, Refractive index, High power lasers, Waveguide modes, Optical simulations, Near field, Waveguide lasers, Beam propagation method, Near field optics

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Proceedings Article | 6 June 2001 Paper

Requirements for uncooled direct laser modulation at 10 Gb/s

Mark Silver, Richard Penty, Kevin Williams, Ian White

Proceedings Volume 4287, (2001) https://doi.org/10.1117/12.429792

KEYWORDS: Modulation, Eye, Semiconductor lasers, Optical simulations, Picosecond phenomena, Laser development, Transmitters, Receivers, Hole burning spectroscopy, Optical filters

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Proceedings Article | 20 April 2001 Paper

Ultrafast all-optical regeneration using a simple SOA/DFB laser device

Kevin Williams, Ian White, Richard Penty, Vishal Saxena

Proceedings Volume 4289, (2001) https://doi.org/10.1117/12.424819

KEYWORDS: Signal attenuation, Optical amplifiers, Ultrafast phenomena, Eye, Fiber lasers, Switching, Bandpass filters, Polarization, Wavelength division multiplexing, Telecommunications

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Proceedings Article | 14 July 2000 Paper

Analysis of the mechanisms for impaired high-temperature high-speed performance of 1.3-um InGaAsP lasers

Richard Penty, Mark Silver, Jennifer Yong, Kevin Williams, Andrew Galbraith, Paul Crump, Ian White, Alexander Onischenko, Aeneas Massara, Judy Rorison

Proceedings Volume 3944, (2000) https://doi.org/10.1117/12.391423

KEYWORDS: Quantum wells, Temperature metrology, Modeling, Heterojunctions, Electrons, Laser damage threshold, Data modeling, Semiconductor lasers, Cladding, Active optics

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Proceedings Article | 1 May 2000 Paper

Polarization pinning of a VCSEL array

Peter Heard, Ian White, Kevin Williams, Laurence Sargent, Judy Rorison, Richard Penty, Kostas Tastavridis

Proceedings Volume 3946, (2000) https://doi.org/10.1117/12.384363

KEYWORDS: Polarization, Etching, Vertical cavity surface emitting lasers, Optical testing, Mineralogy, Polarization control, Ion beams, Gallium, Ions, Particles

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Proceedings Article | 18 April 2000 Paper

Ridge waveguide 1.55-um DFB lasers with uncooled 10-Gb/s operation at 55 degrees C

Paul Crump, Richard Penty, Kevin Williams, Aeneas Massara, Frank Wijnands, Ian White

Proceedings Volume 3947, (2000) https://doi.org/10.1117/12.382100

KEYWORDS: Eye, Modulation, Oxides, Waveguides, Single mode fibers, Waveguide lasers, Multimode fibers, Laser damage threshold, Signal attenuation, Temperature metrology

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Showing 5 of 32 publications

Conference Committee Involvement (3)

Integrated Photonics Platforms III

7 April 2024 | Strasbourg, France

Integrated Photonics Platforms II

4 April 2022 | Strasbourg, France

Integrated Photonics Platforms: Fundamental Research, Manufacturing and Applications

6 April 2020 | Online Only, France

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