Phase tracking with differential dispersion

Xavier Haubois; Sylvestre Lacour; Guy S. Perrin; Roderick Dembet; Pierre Fedou; Frank Eisenhauer; Karine Rousselet-Perraut; Christian Straubmeier; Antonio Amorim; Wolfgang Brandner

doi:10.1117/12.2056410

24 July 2014 Phase tracking with differential dispersion

Xavier Haubois, Sylvestre Lacour, Guy S. Perrin, Roderick Dembet, Pierre Fedou, Frank Eisenhauer, Karine Rousselet-Perraut, Christian Straubmeier, Antonio Amorim, Wolfgang Brandner

Author Affiliations +

Proceedings Volume 9146, Optical and Infrared Interferometry IV; 91461Y (2014) https://doi.org/10.1117/12.2056410
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

Citation Download Citation

Xavier Haubois, Sylvestre Lacour, Guy S. Perrin, Roderick Dembet, Pierre Fedou, Frank Eisenhauer, Karine Rousselet-Perraut, Christian Straubmeier, Antonio Amorim, and Wolfgang Brandner "Phase tracking with differential dispersion", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91461Y (24 July 2014); https://doi.org/10.1117/12.2056410

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