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为了实现光标记交换(OLS)系统中频移键控(FSK)信号速率透明以及频率间隔可调,提出了一种基于偏振调制的频移键控(FSK)/幅移键控(ASK)联合正交调制OLS系统,其中FSK标记信号与ASK净荷信号的速率分别为1.25Gbit/s和20Gbit/s.通过仿真对该信号传输后的误码率(BER)特性及ASK净荷的消光比(ER)、FSK标记的频率间隔对系统性能的影响进行了分析.分析结果表明,增大FSK频率间隔对FSK信号的影响较小,但会恶化ASK信号;而增大ASK净荷的ER可改善ASK信号,但恶化了FSK信号.因此,最终选定ASK净荷ER和FSK标记频率间隔的最佳值分别为4dB和50GHz.
In order to realize the frequency transparency of frequency shift keying (FSK) signal and the adjustable frequency interval in optical label switching (OLS) system, a frequency modulated keying (FSK) / amplitude shift keying (ASK) The modulation OLS system, in which FSK signal and ASK payload signal rates were 1.25Gbit / s and 20Gbit / s. Through the simulation of the signal transmission after the error rate (BER) characteristics and ASK payload extinction ratio ( ER) and FSK markings on the performance of the system were analyzed.The results show that increasing FSK frequency interval has little effect on FSK signal but worsens ASK signal, while increasing ASK payload can improve ER ASK signal, but degraded the FSK signal, the optimal values for the final selected ASK payload ER and FSK flag frequency intervals are 4dB and 50GHz, respectively.