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为了提高系统的传输容量和传输性能,提出了基于高维调制的模分复用通信技术。通过搭建的基于高维调制的模分复用系统,仿真分析了4b-4D和8b-8D高维信号在不同光信噪比、传输距离和模式耦合系数条件下的传输性能,并与传统的谱效率相同的二维调制信号QPSK进行了对比。实验结果表明,在目标误码率下,4b-4D信号和8b-8D信号所需信噪比分别比QPSK信号降低了2和4dB,传输距离分别比QPSK信号增加了20和40km。可见,随着信号维度的增大,信号的抗噪声性能及抗色散性能越好。此外,实验结果表明模式耦合对误码率的影响也随着信号维度的增加而减小。
In order to improve the transmission capacity and transmission performance of the system, a modular modulation and multiplex communication technology based on high dimensional modulation is proposed. The performance of 4b-4D and 8b-8D high-dimensional signals under different optical signal-noise ratio, transmission distance and mode coupling coefficient are simulated and analyzed through the built-in MIMO system. The spectral efficiency of the same two-dimensional modulated signal QPSK were compared. The experimental results show that the required signal-to-noise ratio of the 4-dB signal and the 8-dB signal is 2 and 4 dB lower than that of the QPSK signal and the transmission distance is respectively 20 and 40 km higher than that of the QPSK signal at the target BER. It can be seen that as the signal dimension increases, the anti-noise performance and the anti-dispersion performance of the signal are better. In addition, experimental results show that the effect of mode coupling on bit error rate decreases with the increase of signal dimension.