Simulations also show similar PAPR reduction and fiber nonlinearity mitigation in optical inverse discrete Fourier transformer (OIDFT) based OFDM systems.

This paper proposes a scheme for temporary time locking by using FFT (fast Fourier transformer) in OFDM (orthogonal frequency division multiplexing). The OFDM has a good BER in multipath.

The critical part of this sight is a holographic optical elements combined with a lensless Fourier transform hologram and a holographic beam transformer.