基于异步射频信号驱动级联相位调制器产生平坦光学频率梳  

Generation of Flat Optical Frequency Comb Based on Asynchronous RF-Signal-Driven Cascaded Phase Modulators

作　　者：刘昊明 潘炜[1] 卢冰[1] 于歌 Liu Haoming;Pan WM;Lu Bing;Yu Ge(School of Information Science and Technology,Southwest Jiaotong University,Chengdu,Sichuan 511756,China)

机构地区：[1]西南交通大学信息科学与技术学院,四川成都611756

出　　处：《中国激光》2018年第12期205-210,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61775185);国家863计划(2015AA016903);四川省国际科技合作重点项目(2018HH0002)

摘　　要：基于级联相位调制器(PM),设计并实现了一种梳线数量与梳线间距均可调谐的光学频率梳(OFC)产生方案。采用正弦型射频信号与其倍频信号分别驱动两级PM,并在第二级射频信号加入微小的频率偏移,得到了相位不敏感、平坦度高的OFC。梳线数量与平坦度由两级PM的调制指数调控。当频率偏移为第二级射频信号频率的10-5倍时,OFC的平坦度低于3dB。实验结果表明,产生OFC的梳线数量为7,9,11根,梳线间距分别为5.5GHz和7.5GHz,平坦度不超过2.4dB。Based on cascaded phase modulators (PM), a scheme to generate a optical frequency comb (OFC) with adjustable comb number and comb spacing is proposed and experimentally demonstrated. The sinusoidal radio frequency (RF) signal and its double-frequency signal are used to drive the two cascaded PMs, respectively, simultaneously a small frequency offset is introduced in the second RF signal, and finally a phase-insensitive and high flatness OFC is obtained. The comb number and flatness are regulated by the modulation index of these two cascaded PMs. When the frequency offset is 10-5 times the frequency of the second RF signal, the flatness of this OFC is less than 3 dB. The experimental results show that the comb numbers are 7, 9, and 11, the comb spacing is 5.5 GHz and 7.5 GHz, and the flatness is smaller than 2.4 dB for the generated OFC.

关 键 词：光通信 光学频率梳 相位调制器 频率偏移 平坦度 

分 类 号：TN248.1[电子电信—物理电子学]