光网络中大功率带间串扰攻击研究

Study on High Power Inter-Channel Crosstalk Attack in Optical Networks

理论分析了光网络中大功率带间串扰攻击的产生机理,得出了攻击信号功率和光纤非线性折射率系数是大功率带间串扰攻击对用户信号质量产生破坏影响的主要因素。在VPI中搭建仿真实验系统,以误码率为信号质量评价指标,研究了大功率带间串扰攻击对用户信号质量的攻击影响及其攻击传播能力。结果表明,大功率带间串扰攻击会造成和攻击信号使用同一条光纤进行传输的用户信号质量劣化。攻击信号功率越高,信道间隔距攻击信号越近,光纤非线性折射率系数越大,用户信号受攻击影响越严重。大功率带间串扰攻击具有一定的攻击传播能力,当攻击信号功率高于用户信号功率27 dB时,攻击信号的攻击影响可传播至第四个光交叉连接器。

The mechanism of high power inter- conclusion that power of attack signal and fiber channel crosstalk attack is analyzed theoretically. The nonlinear refractive index are the main factors causing destructive effect on quality of legitimate signals due to high power inter- channel crosstalk attack is obtained. The effects of high power inter-channel crosstalk attack on quality of legitimate signals and its attack propagation capability are investigated by building a simulation system in VPI software and using the bit error rate （BER） as evaluation index. The results show that high power inter-channel crosstalk leads to quality deterioration of legitimate signals propagated in the same fiber as the attack signal. The higher the power of attack signal is, the closer the channel spacing away from the attack signal is and the greater the fiber nonlinear refractive index is, the more the serious legitimate signals are affected by attack. The high power inter-channel crosstalk has an ability of attack propagation, and attack effect of the attack signal can be propagated to the fourth optical cross-connects （OXC4） when the power of attack signal is 27 dB higher than that of the legitimate signals.