Mr. Sebastian Romero-García Profile

Sebastian Romero-García

at RWTH Aachen Univ

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Author

Publications (9)

Proceedings Article | 13 March 2017 Open Access

Passively biased resonantly enhanced silicon photonics modulator with high optical bandwidth

Sebastian Romero-García, Alvaro Moscoso-Mártir, Saeed Sharif Azadeh, Bin Shen, Jovana Nojic, Florian Merget, Jeremy Witzens

Proceedings Volume 10108, 1010802 (2017) https://doi.org/10.1117/12.2253845

KEYWORDS: Modulators, Resonators, Silicon photonics, Phase shifts, Modulation, Phase shift keying, Waveguides, Etching, Capacitance, Silicon

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Proceedings Article | 2 March 2017 Open Access

Photonic integrated circuits for multi-color laser engines

Sebastian Romero-García, Thomas Klos, Edwin Klein, Jonas Leuermann, Douwe Geuzebroek, Joost van Kerkhof, Martin Büscher, Jürgen Krieg, Patrick Leisching, Jeremy Witzens

Proceedings Volume 10108, 101080Z (2017) https://doi.org/10.1117/12.2250758

KEYWORDS: Photonic integrated circuits, Flow cytometry, Free space optics, Waveguides, Polarization, Switches, Modulation, Interfaces, Free space, Wave propagation

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Proceedings Article | 1 May 2015 Open Access

Epitaxially grown vertical junction phase shifters for improved modulation efficiency in silicon depletion-type modulators

S. Sharif Azadeh, S. Romero-García, F. Merget, A. Moscoso-Mártir, Nils von den Driesch, D. Buca, J. Witzens

Proceedings Volume 9516, 95160T (2015) https://doi.org/10.1117/12.2178790

KEYWORDS: Silicon, Modulators, Phase shift keying, Doping, Waveguides, Phase shifts, Modulation, Absorption, Capacitance, Resistance

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High-speed silicon modulators based on the plasma effect in reverse-biased p(i)n junction phase shifters have been extensively investigated. The main challenge for such modulators is to maximize their modulation efficiency without compromising high-speed performance and insertion losses. Here, we propose a highly efficient silicon modulator based on a Mach-Zehnder Interferometer in which the doping profile of a vertical pin junction is precisely controlled by means of in-situ doping during silicon epitaxial growth. The precise level of control afforded by this fabrication procedure allows separately optimizing doping concentrations in the immediate vicinity of the junction and in surrounding electrical transport layers at the nanometric scale, enabling high performance levels. Free carrier absorption losses are minimized by implementing high carrier densities only in the waveguide regions where they benefit the most, i.e., in the immediate vicinity of the junction. Since these devices rely entirely on single crystal silicon, performance degradation caused by poor transport and high optical losses in poly- or amorphous silicon (as utilized in similar vertical phase shifter geometries such as semiconductor-insulator-semiconductor capacitive phase shifters) is avoided. Furthermore, unlike conventional plasma effect silicon phase shifters, the bandwidth of the proposed phase shifters is largely independent of the applied reverse voltage and the phase shift versus applied voltage is linearized, making them more suitable for complex modulation formats. The efficiency of the single ended phase shifters is expected to reach a VπL of 0.56 V•cm and absorption losses of α=4.5 dB/mm, a good performance metric for depletion-type modulators. Lumped element Mach-Zehnder Modulators as well as travelling-wave modulators with phase matching based on meandered waveguides have been designed and their RF characteristics simulated and optimized with Ansoft HFSS. First experiments have validated the growth of the epitaxial stack and complete devices are currently being fabricated.

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Proceedings Article | 3 April 2015 Paper

Silicon photonics WDM interconnects based on resonant ring modulators and semiconductor mode locked laser

J. Müller, J. Hauck, B. Shen, S. Romero-García, E. Islamova, S. Sharif Azadeh, S. Joshi, N. Chimot, A. Moscoso-Mártir, F. Merget, F. Lelarge, J. Witzens

Proceedings Volume 9368, 93680M (2015) https://doi.org/10.1117/12.2080769

KEYWORDS: Optical amplifiers, Semiconductor lasers, Wavelength division multiplexing, Modulators, Modulation, Mode locking, Silicon photonics, Eye, Receivers, Semiconductors

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Proceedings Article | 25 September 2014 Open Access

Advances in silicon photonics segmented electrode Mach-Zehnder modulators and peaking enhanced resonant devices

S. Sharif Azadeh, J. Müller, F. Merget, S. Romero-García, B. Shen, J. Witzens

Proceedings Volume 9288, 928817 (2014) https://doi.org/10.1117/12.2075836

KEYWORDS: Modulators, Modulation, Waveguides, Electrodes, Capacitance, Electro optics, Multiplexers, Phase shifts, Signal attenuation, Phase matching

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Proceedings Article | 1 May 2014 Paper

Misalignment tolerant couplers for hybrid integration of semiconductor lasers with silicon photonics parallel transmitters

S. Romero-García, B. Marzban, S. Sharif Azadeh, F. Merget, B. Shen, J. Witzens

Proceedings Volume 9133, 91331A (2014) https://doi.org/10.1117/12.2051666

KEYWORDS: Waveguides, Tolerancing, Semiconductor lasers, Silicon photonics, Silicon, Transmitters, Etching, Diffraction gratings, Optical design, Reflection

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Proceedings Article | 22 May 2013 Paper

SWG dispersion engineering for ultra-broadband photonic devices

Robert Halir, Alejandro Maese-Novo, Sebastián Romero-García, Diego Pérez-Galacho, Luis Zavargo-Peche, Alejandro Ortega-Moñux, Íñigo Molina-Fernández, J. Gonzalo Wangüemert-Pérez, Pavel Cheben

Proceedings Volume 8767, 87670R (2013) https://doi.org/10.1117/12.2017229

KEYWORDS: Waveguides, Directional couplers, Dispersion, Brain-machine interfaces, Silicon, Refractive index, Light wave propagation, Photonic devices, Multimode interference devices, Diffraction

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Proceedings Article | 7 May 2013 Paper

Silicon nitride back-end optics for biosensor applications

Sebastian Romero-García, Florian Merget, Frank Zhong, Hod Finkelstein, Jeremy Witzens

Proceedings Volume 8781, 87810W (2013) https://doi.org/10.1117/12.2018890

KEYWORDS: Waveguides, Silica, Cladding, Silicon, Reflectors, Metals, Refractive index, Tolerancing, Oxides, Optical design

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Proceedings Article | 2 February 2012 Paper

New concepts in silicon component design using subwavelength structures

Iñigo Molina-Fernandez, Robert Halir, Alejandro Ortega-Moñux, Luis Zavargo-Peche, Sebastian Romero García, Alejandro Maese-Novo, Diego Perez-Galacho, Gonzalo Wanguemert-Perez, Pavel Cheben, Dan-Xia Xu

Proceedings Volume 8266, 82660E (2012) https://doi.org/10.1117/12.906785

KEYWORDS: Waveguides, Silicon, Polarization, Refractive index, Fiber couplers, Etching, Dispersion, Brain-machine interfaces, Optical design, Wave propagation

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Showing 5 of 9 publications

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