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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。
High-speed optical signal source is indispensable in modern optical communications, and has drawn much attention from researchers. A Mach-Zehnder modulator (MZM) with bias control is proposed to generate high-speed microwave photonic signals by using the frequency doubling scheme. Experiments are also conducted. By applying a certain DC bias on the MZM, the phase difference between the two arms’ light pulses causes the split of the light pulses to be doubled. In the experiment, 10 GHz high-quality high-speed optical signals with doubled frequency were successfully obtained by using 5 GHz RF signal source. At the same time, it can also be observed that different pulse sequences can be generated at different bias voltages, and it is found that the optimized bias is a necessary condition for achieving high quality double frequency. The scheme can be used to generate high-frequency light pulses above 40 GHz and can be widely used in high-speed optical communications.