Polarization-insensitive PAM-4-carrying free-space orbital angular momentum (OAM) communications | Zendy

Jun Liu | Zendy; Jian Wang | Zendy

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Polarization-insensitive PAM-4-carrying free-space orbital angular momentum (OAM) communications

Author(s) -

Jun Liu,

Jian Wang

Publication year - 2016

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.24.004258

Subject(s) - optics , physics , polarization (electrochemistry) , angular momentum , multiplexing , orbital angular momentum multiplexing , optical communication , free space optical communication , orbital angular momentum of light , telecommunications , computer science , total angular momentum quantum number , chemistry , quantum mechanics

We present a simple configuration incorporating single polarization-sensitive phase-only liquid crystal spatial light modulator (SLM) to facilitate polarization-insensitive free-space optical communications employing orbital angular momentum (OAM) modes. We experimentally demonstrate several polarization-insensitive optical communication subsystems by propagating a single OAM mode, multicasting 4 and 10 OAM modes, and multiplexing 8 OAM modes, respectively. Free-space polarization-insensitive optical communication links using OAM modes that carry four-level pulse-amplitude modulation (PAM-4) signal are demonstrated in the experiment. The observed optical signal-to-noise ratio (OSNR) penalties are less than 1 dB in both polarization-insensitive N-fold OAM modes multicasting and multiple OAM modes multiplexing at a bit-error rate (BER) of 2e-3 (enhanced forward-error correction (EFEC) threshold).

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