Subcarrier to subcarrier intermixing interference cancellation in vestigial-sideband orthogonal frequency division multiplexing system

摘要

The presence of vestigial-sideband optical filter, dispersion and chirp of modulator increases subcar-riertb subcarrier intermixing interference (SSII), which significantly restricts transmission performance. For the first time, the iterative interference cancellation method is introduced to calculate and eliminate SSII. Furthermore, we successfully demonstrate a 40-Gbps, 16-QAM, dual drive Mach-Zehnder modulator (MZM)-based system transmission through 100-km uncompensated standard single-mode fiber. The impact of chirp on iterative algorithm is also experimentally evaluated by setting different optical phase modulation amplitudes on the two arms of the dual drive MZM.