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深入研究了差分八相移键控(D8PSK)/幅移键控(ASK)正交调制格式的机理,提出了一种基于D8PSK/ASK正交调制的新型光标记方案,利用D8PSK作为载荷的调制方式,ASK作为标记的调制方式,仿真实现了载荷120Gb/s、标记10Gb/s的传输速率。分析了信号的消光比(ER)对误码率(BER)的影响,仿真结果表明,在经过80km单模光纤(SMF)及16km色散补偿光纤(DCF)的传输后,当ER为2.4dB时,系统性能可以达到一个较佳的状态。
The mechanism of D8PSK / ASK modulation is deeply studied. A new optical marking scheme based on D8PSK / ASK orthogonal modulation is proposed, which uses D8PSK as the modulation of the load ASK as the modulation method of the mark, the simulation realizes the load 120Gb / s, marks the transmission rate of 10Gb / s. The effect of extinction ratio (ER) on bit error rate (BER) is analyzed. The simulation results show that when the ER is 2.4dB after transmitting through 80km single mode fiber (SMF) and 16km dispersion compensating fiber (DCF) , System performance can reach a better state.