光学倍乘法中存在的高阶互调失真问题及解决办法

Problem of High Order Intermodulation Distortion in Optical Frequency Multiplication and the Solution to It

指出了光学倍乘法由于系统中采用具有非线性特征的马赫-泽德尔强度调制器,利用多个副载波频率的调制信号进行联合调制时易产生高阶互调失真,会对信息的提取和解调造成干扰,对其提出了改进的建议,仿真实验表明:改进后的系统,消除了高阶互调失真的影响,改善了系统性能.

Optical Frequency Multiplication is presented. Because the system uses non-linear characteristic Mach- Zehnder intensity modulator, when used in multi-subcarrier frequency modulation system, there will be high order intermodulation distortion, which disturbs the information extraction and demodulation. In this article, an improvement suggestion is proposed and its validity is proved with simulation experiment. After the improment, the high order intermodulation distortion has been eliminated and the performance of the system has been improved.