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Proceedings Paper

Adaptive phase-locked fiber array with wavefront phase tip-tilt compensation using piezoelectric fiber positioners
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Paper 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.

Paper Details

Date Published: 25 September 2007
PDF: 12 pages
Proc. SPIE 6708, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation, 67080K (25 September 2007); doi: 10.1117/12.736366
Show Author Affiliations
Ling Liu, Univ. of Maryland, College Park (United States)
Mikhail A. Vorontsov, Univ. of Maryland, College Park (United States)
Army Research Lab. (United States)
Ernst Polnau, Univ. of Maryland, College Park (United States)
Thomas Weyrauch, Univ. of Maryland, College Park (United States)
Leonid A. Beresnev, Army Research Lab. (United States)


Published in SPIE Proceedings Vol. 6708:
Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation
Stephen M. Hammel; Alexander M. J. van Eijk; Michael T. Valley; Mikhail A. Vorontsov, Editor(s)

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