Frequency quadrupling using an integrated Mach–Zehnder modulator with four arms
Frequency quadrupling using an integrated Mach–Zehnder modulator with four arms
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DOI：
10.1016/j.optcom.2011.04.008
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发表时间：
2011-08
影响因子：
2.4
通讯作者：
Xiangling Liu;Zengji Liu;Jiandong Li;Peng Yue
中科院分区：
文献类型：
--
作者：
Xiangling Liu;Zengji Liu;Jiandong Li;Peng Yue
本文提出了一种实现光纤无线通信系统中频率四倍的新技术。采用由1 × 4多模干涉（MMI）耦合器和四个光相位调制器臂组成的集成马赫-曾德尔调制器（MZM）实现四倍频。由于MMI耦合器输出之间固有的分光比和相位关系，只要将主MZM的直流偏置电压设置在最小传输点，就会产生4倍于微波驱动信号频率的+ 1阶和- 3阶光谐波。与传统的双并行MZM相比，集成MZM的复杂度大大降低。从理论上分析了非理想积分MZM对各边带的影响，包括分裂不平衡和偏置漂移。仿真结果表明，理想值的轻微偏差不会对生成的光毫米波信号造成很大的衰减。
In this paper, a novel technique to realize frequency quadrupling in the radio over fiber system is proposed. The frequency quadrupling is achieved by using an integrated Mach–Zehnder modulator (MZM) consisting of a 1 × 4 multimode interference (MMI) coupler and four optical phase modulator arms. Due to the inherent optical splitting ratio and phase relations between the outputs of the MMI coupler, the optical harmonics at + 1 order and − 3 order are generated corresponding to four times frequency of the microwave drive signal, only by setting the DC bias voltage of the main MZM at the minimum transmission point. That leads to the integrated MZM with reduced complexity compared with the conventional dual-parallel MZM. The effect of the nonideal integrated MZM, including the splitting imbalance and the bias drift, on all the sidebands is also analyzed theoretically. The following simulation results show that the slight deviation of the ideal values would not cause great degradation of the generated optical millimeter-wave signal.