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In a few years, the second generation instruments of the Very Large TelescopeInterferometer (VLTI) will routinely provide observations with 4 to 6telescopes simultaneously. To reach their ultimate performance, they will needa fringe sensor capable to measure in real time the randomly varying opticalpaths differences. A collaboration between LAOG (PI institute), IAGL, OCA andGIPSA-Lab has proposed the Planar Optics Phase Sensor concept to ESO for the2nd Generation Fringe Tracker. This concept is based on the integrated opticstechnologies, enabling the conception of extremely compact interferometricinstruments naturally providing single-mode spatial filtering. It allowsoperations with 4 and 6 telescopes by measuring the fringes position thanks toa spectrally dispersed ABCD method. We present here the main analysis which ledto the current concept as well as the expected on-sky performance and theproposed design.

The Planar Optics Phase Sensor: a study for the VLTI 2nd Generation Fringe Tracker