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The space domain of lightwaves has attracted increasing interest in optical communications. Lightwaves having helical phase front and carrying orbital angular momentum (OAM) have seen potential applications both in free-space and fiber-based optical communications. The widely deployed conventional ITU-T G.652 fiber is single mode fiber at 1550 nm, which, however, might support high-order modes as...
We design and experimentally investigate the generation of orbital angular momentum (OAM) beams with topological number from l = −4 to 4 at the wavelength of 632.8 nm utilizing the nanophotonic dielectric metasurface array. We also detect the generated OAM beams using the dielectric metasurface array corresponding to their inverted topological number.
We experimentally demonstrate a chip to few mode fiber (FMF) transmission link with on-off-keying (OOK) signal. The device emits TM01 and TE01 vortex modes which propagate through a 1.1 km FMF with measured OSNR penalties less than 2 dB at a BER of 2e-3.
By employing N-dimensional multiplexing and modulation, i.e. 5.8-Gaud Nyquist 32-QAM signals over pol-muxed 52 orbital angular momentum (OAM) modes (104 channels in total), we experimentally demonstrate a free-space data link with an aggregate ultra-high spectral efficiency of 435 bit/s/Hz.
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