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Stability considerations for adaptive optical filtering

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Abstract

We report analytical and experimental results from an interferometric optical system configured to implement a least mean square error filtering operation with an adaptive filtering loop. We describe the basic operation, experimental optical system, and simulation model; we then compare the results of the model and hardware. We find that the time delay must be minimized in the closed loop signal path to achieve good performance. Optical aberrations must also be controlled depending on the degree of phase margin required to maintain stability. We show that 30–35 dB of stable gain can be achieved with reasonable hardware and system tolerance requirements.

© 1986 Optical Society of America

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