Wavelet packet transform-based OFDM for optical communications

Abstract

Wavelet packet transform-based optical OFDM (WPT-OFDM) systems can be used as an alternative approach to the conventional optical OFDM systems. In this paper, we investigate the performance and limitation of real WPT-OFDM systems. Its double-sideband characteristic makes it sensitive to spectrally non-symmetric dispersion such as polarization-mode dispersion (PMD). Simulations of dual-polarization WPT-OFDM transmission are carried out in the presence of PMD, and compared with conventional Fourier transform-based optical OFDM (FT-OFDM). The results show that WPT-OFDM is very sensitive to PMD, incurring 1-dB penalty at 511 ps DGD for 112-Gb/s dual-polarization transmission. PAPR and nonlineari..