高平坦可调谐电光频梳设计与分析  

Design and Analysis of a High Flat Tunable Terahertz Electro-Optical Frequency Comb

作　　者：张维 赵峰 乔聪 刘安迪 闫特刚 崔悦 刘明星 Zhang Wei;Zhao Feng;Qiao Cong;Liu Andi;Yan Tegang;Cui Yue;Liu Mingxing(School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710121,Shaanxi,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121

出　　处：《激光与光电子学进展》2024年第5期411-418,共8页Laser & Optoelectronics Progress

基　　金：陕西省自然科学基金项目(2023-JC-JQ-58);陕西省创新能力支撑计划(2021TD-09)。

摘　　要：提出一种高平坦宽带光学频率梳(OFC)信号产生方案,对高平坦、宽带电光频梳信号产生机理与方法开展了理论研究与仿真分析。在仿真分析中,利用双驱动马赫-曾德尔调制器产生光频梳信号,利用相位调制器进一步提升梳状线的数量,最后通过联合优化马赫-曾德尔调制器的驱动信号功率和直流偏置电压来提高平坦度。仿真结果显示,该方案可产生带宽为1.08 THz的宽带光频梳信号,音噪比(TNR)达到60 dB、平坦度达到0.5 dB。将所提方案应用于光载太赫兹通信系统,通过仿真验证了单通道及多通道16阶正交幅度调制(16QAM)太赫兹信号在背对背(BTB)或10 km光纤传输情况下的传输性能。结果表明,上述每种情况下的误码率都低于前向纠错码的阈值。A highflat broadband optical frequency comb(OFC)signal generation scheme is proposed,and the mechanism and simulation analysis of the signal generation mechanism and method of highflat and wideband electrooptical comb are carried out.In the simulation analysis,the dualdrive MachZehnder modulator is used to generate the optical frequency comb signal,the phase modulator is used to further increase the number of comb lines,and finally the flatness is improved by jointly optimizing the drive signal power and DC bias voltage of the MachZehnder modulator.The simulation results show that the scheme can generate a broadband comb signal with a bandwidth of 1.08 THz,with a tonetonoise ratio of 60 dB and a flatness of 0.5 dB.The proposed scheme is applied to the optical carrier terahertz communication system,and the transmission performance of singlechannel and multichannel 16thorder quadrature amplitude modulation(16QAM)terahertz signals in the case of backtoback(BTB)or 10 km optical fiber transmission is verified by simulation.The results show that the bit error rate in each of the above cases is lower than the threshold of forward error correction code.

关 键 词：光频梳 马赫-曾德尔调制器 相位调制器 

分 类 号：TN928[电子电信—通信与信息系统]