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This work studied the offset tolerance (OT) with a particular focus on the angular deflection of an orbital angular momentum (OAM) system in free space. We derived an analytical expression of the OT for an angular-deflected Laguerre-Gaussian (LG) beam via Fourier series (FS) expansion and determined the upper bound of the OT for OAM-multiplexed systems. Next, we analyzed the effects of the beam waist,...
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