A few-mode optical fiber retaining optical vortices
The ability of an optical fiber with axial losses to selectively suppress the fundamental HE11 mode, as well as the TE and TM waveguide modes, and, simultaneously, to transmit optical vortices with almost zero energy losses is considered. The attenuation coefficients for the corresponding eigenmodes and vortices are determined. It is shown that such a fiber operates as a mode filter for the feeding beam.
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