深入研究了差分八相移键控(I)8PSK)j幅移键控(AsK)正交调制格式的机理,提出了一种基于D8PsKjASK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 principle of the differential 8-level phase-shift keying (I)SPSK)/amplitude-shift keying (ASK) (DSPSK/ASK) orthogonal modulation formats is investigated, and based on that, a novel scheme of optical label is proposed and demonstrated. In this scheme,DSPSK is used as the modulation formats of the payload signal whose transmission rate is 120 Gbit/ s, while the 10 (;bit/s label signal uses ASK as its modulation formats,and at last, the impact of the signal extinction ratio (ER) on bit error rate (BER) is analyzed. The results of simulation show that better performance of this system can be a chieved when the ER is 2.4 dB after the transmission in 80 km SMF and 16 km DCF.