Adaptive unsaturated OFDM multimode fiber communication technique based on zero padding

In order to overcome the deterioration of system performance induced by the subcarriers at or near the deep fading nulls in high frequency band-pass regions of multimode fiber, we first propose adaptive unsaturated OFDM technique based on zero padding in this paper. In our proposed method, the subcarriers with low SNR (at or near deep fading nulls) are turned off by zero padding, and data originally transmitted by those subcarriers will be transferred to new subcarriers with high SNR which have been created at high frequency by the adjusting of IFFT points. The results show that the technique proposed can accomplish transmission of 10 Gbps data rate over 1 km multimode with the BER of 4.61e−3 when the OSNR is 20 dB.