作　　者： ; ; (师严）;

机构地区： 北京邮电大学电子工程学院光通信与光波技术教育部重点实验室

出　　处： 《北京邮电大学学报》 2010年第5期117-120,共4页

摘　　要： 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. n order to realize the transparent bit rate and the tunable frequency of frequency shift keying （FSK） in the optical label switching （OLS） system, a new method is proposed and verified by simulation with 1.25 Gbit/s FSK label which is generated by polarization modulation and 20 Gbit/s amplitude shift keying （ASK） payload. The bit error rate （BER） performance of combined orthogonal FSK/ASK signal is also researched by simulation in the case of back-to-back and the fiber transmission. Besides, the ex- tinction ratio （ER） of ASK payload and the frequency spacing of FSK label have also been studied to ob- tain the better performance of this OLS system. It is indicated that larger frequency spacing of FSK label will deteriorate the ASK payload, but has little influence on FSK label; larger ER of ASK payload can improve the ASK payload, however, it will bring adverse impact on FSK label. As a result, the optimum ER of ASK payload and the most proper frequency spacing of FSK label are selected to be 4 dB and 50 GHz, respectively.

关 键 词： 光标记交换 频移键控 幅移键控 正交调制 偏振调制

领　　域： [电子电信] [电子电信]