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Abstract
Coherent optical vortices have promising applications in quantum and classical optical communication. They add new degrees of freedom to code information. In this context, to implement a tool enabling sorting of spatially multiplexed vortex states is fundamental. By other hand, spatially incoherent vortices can be more robust in propagation through noise media, such as turbulent atmosphere or obstacles that block part of the light. Therefore, in this work we propose directly applying a high-resolution sorting scheme to spatially incoherent vortex states.
Highlights
Coherent optical vortices have promising applications in quantum and classical optical communication
Since the discovery of the orbital angular momentum (OAM) of light or optical vortices[1], one application that have attracted more attention recently is its use as a new degree of freedom to burst optical communications in the classical[2,3] and quantum regimes[4,5]
The first is based on log-polar transformation[13] which can map OAM modes with an azimuthal phase to plane waves with tilts proportional to the vortex topological charge (TC)[8]
Summary
Coherent optical vortices have promising applications in quantum and classical optical communication. The most used optical beam is the OAM beam called Laguerre-Gauss (LG) beam[6] which can be decomposed in terms of orthogonal components allowing being space-divided with low inter-modal crosstalk among multiple modes[2,3,7] This beam has a finite spatial extend and due to its azimuthal phase dependence can be sorted[8,9,10], being ideal to optical communications. The first is based on log-polar transformation[13] which can map OAM modes with an azimuthal phase to plane waves with tilts proportional to the vortex topological charge (TC)[8] This approach is simple and efficient, but there is a limited separation of adjacent modes. Discriminating incoherent optical vortices with different superimposed TCs is a topic of current interest for optical communication through turbulent atmosphere[22,23]
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