Novel Dispersion and Timing Estimation for Weakly-Coupled OAM Fiber Transmission Systems

Chromatic dispersion estimation (CDE) and timing error detection (TED) are essential components of digital signal processing for coherent optical communication systems. Despite the extensive research conducted in coherent single-mode fiber transmission systems, traditional algorithms are less efficient or ineffective when operating in few-mode fiber transmission. We develop new cyclostationary-based methods for CDE and TED, suitable for mode-division multiplexing systems employing weakly coupled orbital angular momentum fiber. The novel methods feature strong resistance to polarization mode dispersion and mode coupling. Simulations and experimental evaluations confirm the superior performance of the proposed methods.