Mr. Michael Hofbauer Profile

Michael Hofbauer

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Author

Publications (11)

SPIE Journal Paper | 9 July 2024

Cascoded active quencher using a bipolar transistor for fast discharging of a single-photon avalanche

Bernhard Goll, Michael Hofbauer, Horst Zimmermann

OE, Vol. 63, Issue 07, 076102, (July 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.7.076102

KEYWORDS: Quenching, Single photon avalanche diodes, Transistors, Computed tomography, Circuit switching, Picosecond phenomena, Power consumption, CMOS technology, Optical engineering, Plasma display panels

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SPIE Journal Paper | 30 June 2021 Open Access

Experimental and simulation study of fill-factor enhancement using a virtual guard ring in n+/p-well CMOS single-photon avalanche diodes

Seyed Saman Kohneh Poushi, Hiwa Mahmoudi, Michael Hofbauer, Bernhard Steindl, Kerstin Schneider-Hornstein, Horst Zimmermann

OE, Vol. 60, Issue 06, 067105, (June 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.6.067105

KEYWORDS: Virtual reality, Acquisition tracking and pointing, Plasma display panels, TCAD, CMOS technology, Optical engineering, Avalanche photodiodes, Doping, Sensors, Diodes

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SPIE Journal Paper | 14 December 2020

Single-pixel postprocessing-free 5 Mbps quantum random number generator using a single-photon avalanche diode detector and a T/(T − t) pulse-shaped laser driver

Alija Dervić, Nikša Tadić, Hiwa Mahmoudi, Bernhard Goll, Michael Hofbauer, Horst Zimmermann

OE, Vol. 59, Issue 12, 127105, (December 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.12.127105

KEYWORDS: Sensors, Field programmable gate arrays, Continuous wave operation, Semiconductor lasers, Time correlated photon counting, Avalanche photodiodes, Optical engineering, Clocks, Photodetectors, Time metrology

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SPIE Journal Paper | 16 July 2020

Fully integrated optical receiver using single-photon avalanche diodes in high-voltage CMOS

Michael Hofbauer, Bernhard Steindl, Horst Zimmermann

OE, Vol. 59, Issue 07, 070502, (July 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.7.070502

KEYWORDS: Receivers, Photons, Plasma display panels, Avalanche photodiodes, Integrated optics, Digital signal processing, Avalanche photodetectors, Modulation, Optical engineering

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SPIE Journal Paper | 29 April 2020

Performance of high-voltage CMOS single-photon avalanche diodes with and without well-modulation technique

Michael Hofbauer, Bernhard Steindl, Kerstin Schneider-Hornstein, Horst Zimmermann

OE, Vol. 59, Issue 04, 040502, (April 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.4.040502

KEYWORDS: Plasma display panels, Modulation, Doping, Avalanche photodiodes, Photodetectors, Semiconducting wafers, Absorption, Sensors, Quenching (fluorescence), Optical engineering

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SPIE Journal Paper | 10 April 2019

High-voltage active quenching and resetting circuit for SPADs in 0.35 μm CMOS for raising the photon detection probability

Alija Dervić, Bernhard Steindl, Michael Hofbauer, Horst Zimmermann

OE, Vol. 58, Issue 04, 040501, (April 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.4.040501

KEYWORDS: Field effect transistors, Quenching (fluorescence), Plasma display panels, Photodetectors, CMOS sensors, Switches, CMOS technology, Avalanche photodiodes, Single photon detectors, Transistors

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Proceedings Article | 23 May 2018 Presentation

Automatic alignment of photonic components of massive optical switch to ITU channels (Conference Presentation)

Astghik Chalyan, Stefano Tondini, Giorgio Fontana, Lorenzo Pavesi, Nikola Zecevic, Michael Hofbauer, Bernhard Goll, Horst Zimmermann, Francesco Testa, Stefano Stracca, Alberto Bianchi, Costanza Manganelli, Philippe Velha, Paolo Pintus, Claudio Oton, Christophe Kopp, Laetitia Adelmini, Olivier Lemonnier, Gabriel Pares, Guido Chiaretti, Aina Serrano, Jose Ángel Ayucar, Giovani Battista Preve, Jong Moo Lee, Claudio Castellan

Proceedings Volume 10686, 1068613 (2018) https://doi.org/10.1117/12.2306433

KEYWORDS: Optical switching, Switching, Automatic alignment, Integrated optics, Photonic integrated circuits, Channel projecting optics, Germanium, Optical components, Control systems, Photodiodes

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We demonstrate the automatic thermal alignment of photonic components within an integrated optical switch. The WDM optical switch involves switching elements, wavelength de-multiplexers, interleavers and monitors each one needing independent control. Our system manages rerouting of channels coming from four different directions, each carrying 12, 200GHz spaced, wavelengths into eight add/drop ports. The integrated device includes 12 interleavers, which can act either as optical de-interleavers to split the optical signal into odd and even channels or as optical interleavers that recombine the odd and even channels coming from the switching matrix. Integrated Ge photodiodes are placed in key positions within the photonic integrated circuit (PIC) are serve for monitoring. An electronic integrated circuit (EIC) drives the photonic elements by means of dedicated heating circuits (824 on-board heater control cells, 768 for the switching elements and 56 for the interleavers and the mux/de-mux) and reads out the Ge diodes photocurrent through TIAs. We applied a stochastic optimization algorithm to align the spectral response of the interleavers to the ITU grid. We exploit the thermo-optic effect to shift the interleavers pass-band in a desired spectral position. The interleavers are provided with dedicated metallic heaters that can be operated in order to tune the interleaver response, which is typically misaligned due to fabrication inaccuracies. The experimental setup is made of a tunable laser coupled with one input port of optical switch. The optimization algorithm is implemented via a software to drive the EIC till finding the best heating configuration (on the two branches of the interleaver) on the basis of the monitor diode-feedback. This way, the even and odd wavelengths input in the interleaver are directed toward the wanted lines within the switching matrix. Our method has been used for aligning the micro-ring based switching elements in the PIC as well. In that case, the integrated Ge photodiodes have been used to align the photonic components in the PIC in order to enable different pathways for the routing or the broadcasting operation of the optical switch. With no bias applied to the heaters of the switching elements, the optical signal is expected to be maximum at the through port. When the micro-ring heaters are biased, the feedback controller finds the best set of heating values that minimize the optical power at the through port of the switching node. This way, the optical signal is coupled in the drop port and the node is enabled for switching. The algorithm, implemented in LabVIEW, converges over multiple instances and it is robust against stagnation. This work aims at enabling the automatic reconfiguration/restoration of the whole WDW optical switch.

SPIE Journal Paper | 22 July 2014

Investigation of the distance error induced by cycle-to-cycle jitter in a correlating time-of-flight distance measurement system

Johannes Seiter, Michael Hofbauer, Milos Davidovic, Horst Zimmermann

OE, Vol. 53, Issue 07, 073104, (July 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.7.073104

KEYWORDS: Distance measurement, Clocks, Sensors, Modulation, Field programmable gate arrays, Error analysis, Picosecond phenomena, Cameras, Signal generators, Optical engineering

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Proceedings Article | 23 May 2013 Paper

A background light resistant TOF range finder with integrated PIN photodiode in 0.35µm CMOS

Milos Davidovic, Johannes Seiter, Michael Hofbauer, Wolfgang Gaberl, Horst Zimmermann

Proceedings Volume 8791, 87910R (2013) https://doi.org/10.1117/12.2021021

KEYWORDS: PIN photodiodes, Sensors, Distance measurement, Modulation, Integrated optics, CMOS technology, Optical testing, Capacitors, CMOS sensors, Time metrology

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Proceedings Article | 23 May 2013 Paper

Correction of a phase dependent error in a time-of-flight range sensor

Johannes Seiter, Michael Hofbauer, Milos Davidovic, Horst Zimmermann

Proceedings Volume 8791, 87910Y (2013) https://doi.org/10.1117/12.2020493

KEYWORDS: Phase shift keying, Modulation, Distance measurement, Phase shifts, Sensors, Stereoscopic cameras, Clocks, Cameras, Field programmable gate arrays, Evolutionary algorithms

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Proceedings Article | 23 May 2013 Paper

Correction of the temperature dependent error in a correlation based time-of-flight system by measuring the distortion of the correlation signal

M. Hofbauer, J. Seiter, M. Davidovic, H. Zimmermann

Proceedings Volume 8791, 87910Z (2013) https://doi.org/10.1117/12.2021002

KEYWORDS: Light emitting diodes, Temperature metrology, Distance measurement, Modulation, Sensors, Distortion, Stereoscopic cameras, Light sources, Field programmable gate arrays, Clocks

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Showing 5 of 11 publications

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