Closed-loop on-chip phase control and fringe tracking in photonic interferometers

Nick Cvetojevic; Frantz Martinache; Peter Chingaipe; Romain Laugier; Mamadou N'Diaye; Roxanne Ligi; David Mary

doi:10.1117/12.2630002

29 August 2022 Closed-loop on-chip phase control and fringe tracking in photonic interferometers

Nick Cvetojevic, Frantz Martinache, Peter Chingaipe, Romain Laugier, Mamadou N'Diaye, Roxanne Ligi, David Mary

Proceedings Volume 12183, Optical and Infrared Interferometry and Imaging VIII; 1218318 (2022) https://doi.org/10.1117/12.2630002
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

One of the largest limitations faced by nulling interferometers is their extreme sensitivity to any residual optical path differences between the incoming telescope beams induced by the atmosphere, even after adaptive optics or fringe-tracker correction. Here, we present laboratory characterization of active phase-actuators built into a photonic chip containing nulling interferometers in the H-band. Utilizing the thermo-optic effect to actively control the phase delay in the waveguides, we present their performance in terms of accuracy, chromaticity, response time, and stability. We also measure a response time of less than 1ms, and a reproducibility to less than 0.5 degrees of phase (2 nm of optical path). We show a closed-loop demonstration of on-chip piston correction by using the flux measured on multiple ‘bright’ outputs of a Multimode Interference coupler based nuller to servo upstream phase actuators.

Conference Presentation

Citation Download Citation

Nick Cvetojevic, Frantz Martinache, Peter Chingaipe, Romain Laugier, Mamadou N'Diaye, Roxanne Ligi, and David Mary "Closed-loop on-chip phase control and fringe tracking in photonic interferometers", Proc. SPIE 12183, Optical and Infrared Interferometry and Imaging VIII, 1218318 (29 August 2022); https://doi.org/10.1117/12.2630002

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