Jiang Pan, Li Peili, Fan Yiming
College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China.
Front Optoelectron. 2022 Nov 14;15(1):45. doi: 10.1007/s12200-022-00045-0.
Broadband optical frequency comb (OFC) generation based on a single electro-absorption modulator (EAM) is proposed. The EAM is driven by a radio frequency (RF) multi-frequency signal generated by a multiplication coupler composed of an electrical power splitter and an arithmetic circuit. Thus the number of comb-lines of the generated OFC can be increased. A complete theoretical model of OFC generation by an EAM driven by nth power of the RF source is established, and the performance of the OFC is analyzed by using OptiSystem software. The results show that, the number of comb-lines of the OFC is positively correlated with the number of multiplication of the RF source signal. The frequency spacing of the comb-lines is twice the frequency of the RF source signal and is tunable by adjusting the frequency of the RF source signal. Increasing chirp factor and modulation index of EAM could increase the number of comb-lines of the generated OFC. The amplitude of the RF source signal had little impact on the flatness of the OFC and the average OFC power. The scheme developed is not only simple and low-cost, but also can produce a large number of comb-lines.
提出了一种基于单个电吸收调制器（EAM）产生宽带光频梳（OFC）的方法。该电吸收调制器由一个由功率分配器和算术电路组成的乘法耦合器产生的射频（RF）多频信号驱动。因此，可以增加所产生光频梳的梳齿线数量。建立了由射频源的n次幂驱动的电吸收调制器产生光频梳的完整理论模型，并使用OptiSystem软件对光频梳的性能进行了分析。结果表明，光频梳的梳齿线数量与射频源信号的乘法次数呈正相关。梳齿线的频率间隔是射频源信号频率的两倍，并且可以通过调整射频源信号的频率进行调谐。增加电吸收调制器的啁啾因子和调制指数可以增加所产生光频梳的梳齿线数量。射频源信号的幅度对光频梳的平坦度和光频梳平均功率影响很小。所开发的方案不仅简单且成本低，而且可以产生大量的梳齿线。
