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针对传统马赫-曾德尔调制器(MZM)在光载正交频分复用(OFDM)系统中的非线性失真问题,提出了一种新的并行MZM结构,该结构由主调制器和起补偿作用的子调制器组成。理论分析与仿真表明:通过设计调制器电极长度与输入光功率,使得相位误差衰减因子小于1,此时并行MZM的非线性失真小于传统MZM。在相同调制指数下,并行MZM对应的星座图更加收敛,但随着调制指数的增加而逐渐发散。
Aiming at the nonlinear distortion problem of traditional Mach-Zehnder modulator (MZM) in Orthogonal Frequency Division Multiplexing (OFDM) system, a new parallel MZM architecture is proposed, which consists of main modulator and compensation The role of the sub-modulator. Theoretical analysis and simulation show that the phase error attenuation factor is less than 1 by designing the modulator electrode length and input optical power, and the nonlinear distortion of the parallel MZM is less than that of the conventional MZM. Under the same modulation index, constellation maps corresponding to parallel MZM converge more, but gradually diverge as the modulation index increases.