Space division multiplexing technology based on transverse wavenumber of Lommel–Gaussian beam

Abstract We propose a novel orbital angular momentum (OAM) space division multiplexing system based on Lommel-Gaussian (LMG) beam, which utilizes different transverse wavenumbers under the same topological charge. Using the random phase screen method and diffraction theory, the evolution of light field and mode crosstalk are effectively analyzed during transmission. Owing to the non-diffracting feature, LMG beams are more robust than traditional Laguerre–Gaussian (LG) beams through spatial spectrum analysis under the same intensity. More importantly, the results show that the shape of demultiplexed spot is related to the symmetry of original OAM-carrying beam and LMG beams with smaller scaling factor are better for detection. This work is anticipated to open up new perspectives for future high-capacity communication missions.