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在偏振复用系统中,利用两个正交的偏振光作为不同的信道在同一根光纤传输.从而达到使传输信息量加倍的目的。在信号接收端.需要将这两个信道重新分离,分离时除了偏振模式色散(PMD)之外,还会受到偏振相关损耗(PDL)的影响。根据PDL的原理,推导了偏振复用系统中两正交信道夹角与PDL的数值关系,计算了PDL大小对系统的影响。并依据理论模型构建了实验系统,对光纤一个主轴光强进行衰减,描绘出信道间串扰和PDL之间的实验曲线,验证了理论分析的有效性。实验表明,PDL调至最小的时候.若要求串扰控制在-10 dB以内.差分群时延(DGD)应该压制在10 ps以内;当DGD增大到140 ps以后,被标记和没被标记的信道信号强度达到了1:1,系统则完全无法工作,在接收端无法分离信道。本项研究对于保证偏振复用系统的稳定性具有一定的指导意义。
In the polarization multiplexing system, two orthogonal polarized lights are transmitted on the same optical fiber as different channels, so as to double the amount of transmitted information. At the signal receiving end, the two channels need to be separated again, and apart from the polarization mode dispersion (PMD), they are also affected by the polarization dependent loss (PDL). According to the principle of PDL, the relationship between the angle of two orthogonal channels and the PDL in the polarization multiplexing system is deduced, and the influence of PDL size on the system is calculated. The experimental system was constructed according to the theoretical model. The optical intensity of one principal axis of fiber was attenuated, and the experimental curve between crosstalk between channels and PDL was plotted, which verified the validity of the theoretical analysis. Experiments have shown that when the PDL is minimized, crosstalk control is required to be within -10 dB, DGD should be suppressed within 10 ps, and when the DGD is increased to 140 ps, the DGD is marked and unmarked Channel signal strength reached 1: 1, the system is completely unable to work in the receiving end can not be separated channel. This study has certain guiding significance for ensuring the stability of the polarization multiplexing system.