基于调制器级联的可调谐平坦光频梳产生

Generation of Tunable Flat Optical Frequency Comb Based on Cascaded Modulators

针对当前电子信息系统对于大宽带、并行处理、灵活控制等方面的迫切需求,提出了一种多梳齿、高平坦度、易调谐的宽带光频梳产生方案。通过级联双平行马赫-曾德尔调制器和双驱动马赫-曾德尔调制器,并简单调整两个调制器的直流偏置电压和射频驱动信号的幅度,实现了梳齿数量为35、平坦度为0.5 dB、杂散信号抑制比为15 dB的频率等间隔光频梳。此外,该方案产生的光频梳易于调谐,通过改变射频驱动信号的频率,即可实现不同频率间隔的光频梳,同时表现出较好的稳定性。

Aiming at the urgent needs of electronic information system for large broadband,parallel processing,flexible control,etc,this paper proposed a generation method of broadband optical frequency comb(OFC)with multi-combs,high flatness,and easy-tuning.By cascading a dual-parallel Mach-Zehnder modulator(DPMZM)and a dual-driven MachZehnder modulator(DDMZM),and simply adjusting the direct current bias voltage and amplitude of radio frequency(RF)driven signal of two modulators,a frequency equally spaced OFC with 35 comb lines,flatness of 0.5 dB,and spurious signal rejection ratio of 15 dB is realized.In addition,the OFC generated by this scheme is easily tuned.By changing the frequency of RF driven signal,OFCs with different frequency intervals can be realized,and exhibite good stability.