Experimental demonstration of photonic phase correctors based on grating coupler arrays and thermo-optic shifters

Momen Diab; Ross Cheriton; Jacob Taylor; Dhwanil Patel; Libertad Rojas; Mark Barnet; Polina Zavyalova; Dan-xia Xu; Pavel Cheben; Siegfried Janz; Jens H. Schmid; Suresh Sivanandam

doi:10.1117/12.3018964

27 August 2024 Experimental demonstration of photonic phase correctors based on grating coupler arrays and thermo-optic shifters

Momen Diab, Ross Cheriton, Jacob Taylor, Dhwanil Patel, Libertad Rojas, Mark Barnet, Polina Zavyalova, Dan-xia Xu, Pavel Cheben, Siegfried Janz, Jens H. Schmid, Suresh Sivanandam

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130972K (2024) https://doi.org/10.1117/12.3018964
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

In ground-based astronomy, the ability to couple the light into single-mode fibers (SMFs) is limited by atmospheric turbulence, which prohibits the use of many astrophotonic instruments. We propose a silicon-on-insulator photonic chip capable of coherently coupling the out-of-phase beamlets from the subapertures of a telescope pupil into an SMF. The PIC consists of an array of grating couplers used to inject the light from free space into single-mode waveguides on a chip. Metalic heaters modulate the refractive index of a coiled section of the waveguides, facilitating the co-phasing of the propagating modes. The beamlets can then be coherently combined to efficiently deliver the light to an output SMF. In an adaptive optics system, the phase corrector would act as a deformable mirror commanded by a controller that takes phase measurements from a wavefront sensor. We present experimental results for the PIC tested on an AO testbed and compare the performance to simulations.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Momen Diab, Ross Cheriton, Jacob Taylor, Dhwanil Patel, Libertad Rojas, Mark Barnet, Polina Zavyalova, Dan-xia Xu, Pavel Cheben, Siegfried Janz, Jens H. Schmid, and Suresh Sivanandam "Experimental demonstration of photonic phase correctors based on grating coupler arrays and thermo-optic shifters", Proc. SPIE 13097, Adaptive Optics Systems IX, 130972K (27 August 2024); https://doi.org/10.1117/12.3018964

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