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Proceedings Paper

Phase tracking with differential dispersion
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Paper Abstract

Differential chromatic dispersion in single-mode optical fibres leads to a loss of contrast of the white light fringe. For the GRAVITY instrument, this aspect is critical since it limits the fringe tracking performance. We present a real-time algorithm that compensates for differential dispersion due to varying fibre lengths using prior calibration of the optical fibres. This correction is limited by the accuracy to which the fibres stretch is known. We show how this affects the SNR on the white light fringe for different scenarios and we estimate how this phenomenon might eventually impact the astrometric accuracy of GRAVITY observations.

Paper Details

Date Published: 24 July 2014
PDF: 6 pages
Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91461Y (24 July 2014); doi: 10.1117/12.2056410
Show Author Affiliations
Xavier Haubois, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique, CNRS, Observatoire de Paris à Meudon (France)
Univ. Paris Diderot (France)
Sylvestre Lacour, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique, CNRS, Observatoire de Paris à Meudon (France)
Univ. Paris Diderot (France)
Guy S. Perrin, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique, CNRS, Observatoire de Paris à Meudon (France)
Univ. Paris Diderot (France)
Roderick Dembet, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique, CNRS, Observatoire de Paris à Meudon (France)
Univ. Paris Diderot (France)
Pierre Fedou, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique, CNRS, Observatoire de Paris à Meudon (France)
Univ. Paris Diderot (France)
Frank Eisenhauer, Max-Planck-Institut für extraterrestrische Physik (Germany)
Karine Rousselet-Perraut, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Joseph Fourier (France)
Christian Straubmeier, Univ. zu Köln (Germany)
Antonio Amorim, Fundacão da Faculdade de Ciências da Univ. de Lisboa (Portugal)
Wolfgang Brandner, Max-Planck-Institut für Astronomie (Germany)


Published in SPIE Proceedings Vol. 9146:
Optical and Infrared Interferometry IV
Jayadev K. Rajagopal; Michelle J. Creech-Eakman; Fabien Malbet, Editor(s)

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