12 September 2005 Adaptive control of a MEMS steering mirror for free-space laser communications
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This paper presents an adaptive control scheme for laser-beam steering by a two-axis MEMS tilt mirror used in current free-space optical communications systems. In the control scheme presented here, disturbances in the laser beam are rejected by a high-performance linear time-invariant feedback controller augmented by the adaptive control loop, which determines control gains that are optimal for the current disturbance acting on the laser beam. The variable-order adaptive control loop is based on an adaptive lattice filter that implicitly identifies the disturbance statistics from real-time sensor data. Experimental results are presented to demonstrate the effectiveness of the adaptive controller for rejecting multi-bandwidth jitter. These results demonstrate that the adaptive loop significantly extends the jitter-rejection bandwidth achieved by the feedback controller alone.
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Nestor O. Perez Arancibia, Neil Chen, Steve Gibson, Tsu-Chin Tsao, "Adaptive control of a MEMS steering mirror for free-space laser communications", Proc. SPIE 5892, Free-Space Laser Communications V, 589210 (12 September 2005); doi: 10.1117/12.619586; https://doi.org/10.1117/12.619586

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