Free-Space Underwater Constant-Envelope Orthogonal Frequency Division Multiplexing using Phase Modulation of Orbital Angular Momentum Modes

This paper presents experimental results for a constant-envelope OFDM platform using two coherently coupled OAM beams for a free space underwater link using a frequency doubled IR source at 532 nm for power delivery and high-speed communications in turbid environments. Results will be presented for coherently combined OAM modes with results including both ballistic and diffusive scattering regimes.