Design and Implementation of Fractional-Order PI Control for Fractional-Order Optical Communication Systems

This study proposes a fractional-order control strategy for the Optical Communication Tracking System (OCTS) to enhance tracking accuracy and robustness in free-space transmission. Fractional order models capture the dynamic properties of OCTS more accurately than traditional integer-order models. Subsequently, a Fractional-Order Proportional Integral (FO-PI<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ</sup>) controller was designed based on finite-dimensional sampling data, which introduces the parameter λ to enhance control flexibility and precision. Simulation results demonstrate that the FO-PI<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ</sup>controller outperforms traditional integer-order PI controllers in terms of tracking accuracy and system stability.