In this paper, an alternative fiber-optic method for forming vortex modes based on a chiral (twisted) microstructured fiber is proposed. This fiber can be considered as a ring-core fiber with ring core formed by capillaries. Besides, optical fibers design for transmitting optical vortexes over long distances. i.e. a vortex-maintaining fiber is also proposed. This fiber is a multimode fiber with an extremely large core. A comparison of the different types of vortex generation and vortex-maintaining fibers is also given. Both proposed fibers can be used in Radio over Fiber systems applying vortex beams.
KEYWORDS: Signal generators, Radio optics, Radio over Fiber, Antennas, Modulation, Telecommunications, Fiber optics, Orthogonal frequency division multiplexing, Prototyping, Channel projecting optics
This paper describes the operation of the prototype of the Radio-over-Fiber telecommunication system with the generation of OAM signals in the W-band. A method for generation both a radio and an optical OAM signal in RoF is proposed, a method for useful information transmission using OFDM technology in the considered system is described, an approach to converting optical vortexes into the radio domain is proposed, and a feedback channel simulation in RoF systems using OAM signals is carried out.
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