Based on orthogonal frequency division multiplexing(OFDM) and wavelength division multiplexing(WDM) principle, a model of OFDM-WDM transmission system was designed. The common phase error and inter-carrier interference in OFDM system caused by the phase noise were analyzed using Wiener phase noise model. In order to suppress the phase noise, a general inter-carrier interference suppression scheme was provided based on the interleaved OFDM technology. The analytical and numerical results show that this interleaved OFDM technology effect in reducing inter-carrier interference on the performance of OFDM system, at the same time, the signal processing ability of the system.