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Conference on Lasers and Electro-Optics

Long-range fiber-transmission of photons with orbital angular momentum

Nenad Bozinovic, Poul Kristensen, Siddharth Ramachandran

Published Jan 1, 2011• 33 citations
Publisher

Abstract

We demonstrate propagation of light possessing orbital angular momentum over record fiber-lengths (~km) with minimal cross-talk (<20-dB). This yields a novel degree of freedom for encoding information in fibers for quantum or classical communication links.
DOI
10.1364/cleo_si.2011.ctub1

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In free-space or in optical fibers, orbital angular momentum (OAM) multiplexing for information transmission has been greatly developed. The light sources used were well coherent communication bands, and the fibers used were customized. Here, we use an 810 nm femtosecond laser to generate optical vortices carrying OAM and then feed them into two kinds of commercial step-index few-mode fibers to explore the transmission characteristics of OAM modes. We also propose a method without multiple-input multiple-output digital signal processing to identify the input OAMs. It is of great guiding significance for high-dimensional quantum information experiments via the OAMs as a degree of freedom, using the light generated by the spontaneous parametric down-conversion as the source and the commercial fibers for information transmission.