Dr. Stephan Hernandez Profile

Dr. Stephan Hernandez

at European Space Research and Technology Ctr

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Publications (5)

Proceedings Article | 20 November 2017 Open Access

Development and ESCC evaluation of an European optocoupler for space applications

Matteo Bregoli, Cristina Ress, Amos Collini, Francesco Ficorella, Gabriele Giacomini, Francesca Mattedi, Alessandra Costantino, Stephan Hernandez, Mustapha Zahir

Proceedings Volume 10564, 1056432 (2017) https://doi.org/10.1117/12.2309108

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Proceedings Article | 17 November 2017 Open Access

Hermod: optical payload technology demonstrator flying on PROBA-V: overview of the payload development, testing and results after 1 year in orbit exploitation

S. Hernandez, J. Blasco, V. Henriksen, H. Samuelsson, O. Navasquillo, M. Grimsgaard, K. Mellab

Proceedings Volume 10563, 1056336 (2017) https://doi.org/10.1117/12.2304192

KEYWORDS: Optical fabrication, Connectors, Vegetation, Standards development, Astronomical imaging, Satellites, Optical fiber cables, Optics manufacturing, Photonics, Polishing

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Proba-V is the third mission of ESA’s Programme for In-orbit Technology Demonstration (IOD), based on a small, high performance satellite platform and a compact payload. Besides, the main satellite instrument aiming at Vegetation imaging, Proba-V embarks five technological payloads providing early flight opportunities for novel instruments and space technologies. Successfully launched by the ESA VEGA launcher in May 2013, it has now completed its commissioning and the full calibration of platform, main instrument and additional payloads and is, since last October, fully operational.

The High dEnsity space foRM cOnnector Demonstration or HERMOD is the last payload selected to fly on Proba-V. The payload objective is to validate through an actual launch and in orbit high-density optical fibre cable assembly, cumulate space heritage for fibre optics transmission and evaluate possible degradation induced by the space environment compared to on-ground tests. The future applications of this technology are for intrasatellite optical communications in view of mass reduction, the electrical grounding simplification and to increase the transmission rate. The project has been supported under an ESA GSTP contract. T&G Elektro (Norway) developed and tested the different optical cable assembly to be validated in the payload. The electrooptic modules, control, power and mechanical interfaces have been developed by DAS Photonics (Spain).

The payload contains four optical channels to be studied through the experiment, two assemblies with MTP/PC connectors and two assemblies with MPO/APC connectors. Optical data is transmitted in the four independent channels using two optoelectronic conversion modules (SIOS) working at 100Mbps including 2 full duplex channels each. A FPGA is used to generate, receive and compare the different binary patterns. The number of errors (if any) and Bit Error Rate (BER) is sent to the satellite TM interface. HERMOD successfully went through all mechanical and environmental tests before the integration in a very limited time. The telemetry data is currently sent to ground on daily basis. All the channels have survived the launch and no BER has been measured with the exception of channel 2, currently recording a BER of 3.06*10-16, that exhibits from time to time a burst of errors due to synchronizing issues of the initial data frame. It is expected to observe during the operating life of the payload the first errors within the channel 4 which was designed on purpose with reduced power margin.

This paper will present the full overview of the HERMOD technology demonstrator including the development, testing, validation activity, integration, commissioning and 1 year in-orbit exploitation results.

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Proceedings Article | 17 November 2017 Open Access

Development and ESCC evaluation of a European radiation tolerant optocoupler

M. Bregoli, L. How, A. Collini, F. Ficorella, G. Giacomini, P. Bellutti, S. Hernandez, M. Zahir

Proceedings Volume 10563, 105631Q (2017) https://doi.org/10.1117/12.2304181

KEYWORDS: Astronomical imaging, Light emitting diodes, Inspection, Manufacturing, Phototransistors, Temperature metrology, Microelectronics, Photodetectors, Assembly equipment, Humidity

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Proceedings Article | 17 November 2017 Open Access

AVIM and mini-AVIM as first qualified connectors for space application under ESCC standards

Frédéric Taugwalder, Stephan Hernandez

Proceedings Volume 10563, 105631O (2017) https://doi.org/10.1117/12.2304112

KEYWORDS: Connectors, Manufacturing, Diamond, Astronomical imaging, Control systems, Photonics, Epoxies, Optical fibers, Standards development, Quality systems

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Proceedings Article | 18 February 2010 Paper

MOEMS for space application: the European Space Agency strategy for photonics components

Stephan Hernandez, Mustapha Zahir, Fabien Filhol, Laurent Marchand

Proceedings Volume 7594, 75940S (2010) https://doi.org/10.1117/12.855592

KEYWORDS: Microopto electromechanical systems, Photonics, Aerospace engineering, Sensors, Space operations, Micromirrors, Spectrometers, Manufacturing, Microelectromechanical systems, Optical switching

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