Abstract
We demonstrate the two-dimensional tunable orbital angular momentum (OAM) generation in a ring-core (vortex) fiber. The mode generated by an all fiber fused coupler is coupled into a vortex fiber. Because the vector modes of the mode group in the vortex fiber are no longer degenerate, the mode status will change between linearly polarized modes (LPMs) and complex OAM modes periodically during propagation. The generated OAM can be tuned smoothly by filtering the mixed mode with different polarization directions or changing the wavelength at a certain polarization directions. The two-dimensional tuning of OAM from to is experimentally demonstrated in an all fiber OAM generator.
© 2017 Optical Society of America
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