25 September 2007 Adaptive phase-locked fiber array with wavefront phase tip-tilt compensation using piezoelectric fiber positioners
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Abstract
In this paper, we present the recent development of a conformal optical system with three adaptive phase-locked fiber elements. The coherent beam combining based on stochastic parallel gradient descent (SPGD) algorithm is investigated. We implement both phase-locking control and wavefront phase tip-tilt control in our conformal optical system. The phase-locking control is performed with fiber-coupled lithium niobate phase shifters which are modulated by an AVR micro-processor based SPGD controller. The perturbation rate of this SPGD controller is ~95,000 iterations per second. Phase-locking compensation bandwidth for phase distortion amplitude of 2π-radian phase shift is >100Hz. The tip-tilt control is realized with piezoelectric fiber positioners which are modulated by a computer-based software SPGD controller. The perturbation rate of the tip-tilt SPGD controller is up to ~950 iterations per second. The tip-tilt compensation bandwidth using fiber positioners is ~10Hz at 60-μrad. jitter swing angle.
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Ling Liu, Ling Liu, Mikhail A. Vorontsov, Mikhail A. Vorontsov, Ernst Polnau, Ernst Polnau, Thomas Weyrauch, Thomas Weyrauch, Leonid A. Beresnev, Leonid A. Beresnev, } "Adaptive phase-locked fiber array with wavefront phase tip-tilt compensation using piezoelectric fiber positioners", Proc. SPIE 6708, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation, 67080K (25 September 2007); doi: 10.1117/12.736366; https://doi.org/10.1117/12.736366
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