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利用保护间隔消除由色散引起的符号间干扰(ISI)对于光正交频分复用(OOFMD)系统是必不可少的。延时在不同的传输距离和传输环境下是不同的,采用固定保护长度的方式会硬响系统的功率和频谱利用率。提出了一种先进的自适应循环前缀(ACP)方法。对于多模光纤信道,循环前缀可以根据差分模延时(DMD)与传输距离确定其取值下限来消除ISI的影响。仿真实验验证,采取合适的保护间隔,在多模光纤传输10 Gb/s达1 km时,可达到与采用定长循环前缀时相同的传输性能。
The use of guard intervals to eliminate intersymbol interference (ISI) caused by dispersion is essential for optical Orthogonal Frequency Division Multiplexing (OOFMD) systems. Delay in different transmission distance and transmission environment is different, the use of fixed length of the protection method will be hard to ring the system power and spectrum utilization. An advanced Adaptive Cyclic Prefix (ACP) method is proposed. For multimode fiber channels, the cyclic prefix can eliminate the effect of ISI by determining the lower bound of its value based on differential mode delay (DMD) and transmission distance. Simulation experiments show that with the proper guard interval, the same transmission performance can be achieved when the multi-mode fiber transmits 10 Gb / s up to 1 km.