Abstract
We present a method in this Letter to generate optical vortices with tunable orbital angular momentum (OAM) in optical fibers. The tunable OAM optical vortex is produced by combining different vector modes () and () when or combining () and () when with a phase shift. The vortex can be regarded as a result of overlapping two orthogonal optical vortex beams of equal helicity but opposite chirality with a phase shift. We have experimentally demonstrated the smooth variation of OAM from to by adjusting a polarizer at the output end of the fiber.
© 2016 Optical Society of America
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