基于偏置马赫-曾德调制器的微波光子信号倍频

高速光信号源在现代光通信中不可或缺,目前倍受研究者关注。提出了利用一种具有偏置控制的马赫-曾德尔调制器(MZM),采用倍频方案产生高速微波光子信号,并进行了实验研究。通过在MZM 上施加一定的直流偏置引起两臂光脉冲的相位差,使光脉冲发生分裂实现倍频。实验中,利用5 GHz 的射频信号源,成功获得了频率增加一倍的10 GHz 高质量高速光信号。同时,也可以观察到在不同偏置电压下会产生不同的脉冲序列,发现优化偏压是实现高质量倍频的必要条件。该方案可用于产生40 GHz 以上的高频率光脉冲,可广泛应用于高速光通信。

Frequency multiplication of microwave photonic signal based on biased Mach-Zehnder modulator

High -speed photonic signal source is absolute necessity for modern optical communications, which attracts more and more attention at present. By using a biased Mach-Zehnder modulator (MZM), a simple scheme based on frequency multiplication was presented and experimentally investigated for generation of high-speed microwave photonic signal. The phase difference of two beams in the MZM was adjusted by a DC bias applied on the MZM, which caused pulse splitting and frequency multiplication. In the experiment, a 5 -GHz RF signal source successfully generated double -frequency microwave optical signal (10-GHz) with great quality. It was also observed that different biased voltage would produce different pulse train, while the optimal bias was required for high -quality frequency multiplication. This scheme is available to generate high-frequency optical pulses over 40 GHz, which is promising to be widely used in microwave photonic communication.