基于单个强度调制器产生宽光学频率梳系统的研究  

Wide Optical Frequency Comb System Based on Single Intensity Modulator

作　　者：高军萍 赵盟盟 卢嘉 刘剑飞 何静飞 Gao Junping;Zhao Mengmeng;Lu Jia;Liu Jianfei;He Jingfei(School of Electronics and Information Engineering,Hebei University of Technology,Tianjin 300401,China;Tianjin Key Laboratory of Electronic Materials&Devices,Tianjin 300401,China)

机构地区：[1]河北工业大学电子信息工程学院,天津300401 [2]天津市电子材料与器材重点实验室,天津300401

出　　处：《激光与光电子学进展》2021年第9期236-244,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61801164);天津市自然科学基金(18JCQNJC01700);河北省自然科学基金(F2019202387);河北省教育厅重点项目(ZD2020304)。

摘　　要：提出了基于双边带调制方式利用单个马赫-曾德尔调制器(MZM)生成平坦宽光学频率梳的方案。两个激光器的频率差直接决定了双边带调制后光学频率梳产生的频谱宽度与质量,通过理论分析不同调制系数下各阶边带间的标准差以及各阶边带的贝塞尔值,发现5阶以上的边带对宽光学频率梳的影响可以忽略不计。而功率较低的5阶边带会叠加在各阶边带上,使得各阶边带的功率得以补偿或抵消,从而减小高阶边带对光学频率梳的影响,提升平坦度。仿真得到的宽光学频率梳的平坦度达到3.7dB,有效频谱宽度为700GHz。将传输速率为5Gbit/s的不归零码数据调制到此光学频率梳上,经过光纤传输后.眼图依然清晰可见,在10^(-9)量级误码率下功率代价小于1.8dB。这样的光学频率梳在光通信中可传送更多的数据信息,实现了高速数据传输并保持了光学频率梳的平坦度,稳定性能较好,成本低廉。This paper proposes a scheme which uses a single Mach-Zehnder modulator(MZM)to generate a flat and wide optical comb based on the double-sideband modulation method.The frequency difference between two lasers directly determines the spectral width and quality of this comb after double-sideband modulation.Through the theoretical analysis of the standard deviation between the sidebands of different orders under different modulation coefficients and the Bessel value of each order sideband,we find sidebands above the fifth order have a negligible effect on the wide comb.The lower-power fifth-order sidebands are superimposed on the sidebands of different orders,so that the powers of the sidebands of different orders can be compensated or cancelled,thereby reducing the influence of the higher-order sidebands on the optical frequency comb and improving the flatness.The flatness of the wide optical comb obtained by simulation reaches 3.7 dB,and the effective spectral width is 700 GHz.After the non-return to zero data with transmission rate of 5 Gbit’s^(-1) is modulated on this optical comb and transmitted through an optical fiber,the eye diagram is still clearly visible,and the power penalty is less than 1.8 dB at the bit error rate level of 10^(-9).Such an optical comb can transmit more data information in optical communications,realize high-speed data transmission and maintain the flatness of the optical comb with good stability and low cost.

关 键 词：集成光学 光学频率梳 强度调制器 平坦度 双边带调制 

分 类 号：TN929.11[电子电信—通信与信息系统]