Improvement of flatness of optical frequency comb based on nonlinear effect of intensity modulator.
Improvement of flatness of optical frequency comb based on nonlinear effect of intensity modulator.
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DOI：
10.1364/ol.36.002749
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发表时间：
2011-07
期刊：
影响因子：
3.6
通讯作者：
Yujie Dou;Hongming Zhang;M. Yao
中科院分区：
文献类型：
--
作者：
Yujie Dou;Hongming Zhang;M. Yao
实验研究了利用级联的强度和相位调制器产生光频梳。通过级联直接由正弦波形驱动的强度和相位调制器，可以实现非常平坦的OFC，其中不需要啁啾光纤布拉格光栅或专门定制的射频波形。研究发现，光场效应器的光谱平坦度与强度调制器的直流偏置有关，直流偏置与半波电压的最佳比值为0.35。在10 GHz微波频率下，共获得15条谱功率变化小于1 dB的梳状线。实验结果与模拟结果吻合较好。
Optical frequency comb (OFC) generated using cascaded intensity and phase modulators was experimentally demonstrated. Very flat OFC can be achieved by cascading intensity and phase modulators driven directly by sinusoidal waveform, where chirped fiber Bragg grating or specially tailored radio frequency waveforms are not required. It is found that the spectral flatness of OFC is related to direct current (DC) bias of intensity modulator and the optimum ratio of DC bias to half-wave voltage is 0.35. In the experiment, 15 comb lines within 1 dB spectral power variation are obtained at 10 GHz microwave frequency. The experimental results agree well with the simulation.