基于四次乘方射频信号和级联MZM的梳线可调的光学频率梳  

Comb line adjustable optical frequency comb based on 4th power RF signal and cascaded MZMs

作　　者：史睿 李培丽[1] SHI Rui;LI Peili(College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院,江苏南京210023

出　　处：《光电子．激光》2023年第3期299-305,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61571237);江苏省自然科学基金(BK20151509);江苏省研究生科研创新计划(KYCX20_0796)资助项目。

摘　　要：提出了一种基于四次乘方射频(radio frequency,RF)信号和级联马赫-曾德尔调制器(Mach-Zehnder modulator,MZM)的梳线可调的光学频率梳(optical frequency comb,OFC)产生方案。利用乘方运算电路对正弦RF信号进行运算耦合,产生的乘方RF信号驱动级联的MZM,调制器对输入光进行调制,从而产生梳线数可调的平坦OFC。建立了乘方RF信号驱动级联MZM产生OFC的理论模型,利用OptiSystem软件对其性能进行了研究。结果表明,OFC的梳线间隔是RF信号源频率的2倍,可调谐并且拓展了频谱带宽;产生OFC的目标梳线数是基准调制电压的4倍,实现了梳线数可调谐;调节MZM上下支臂的调制和偏置电压差为确定的优化值,可以使不同目标梳线数的OFC平坦度均小于0.95dB。A comb line adjustable optical frequency comb(OFC)generation scheme based on 4th power radio frequency(RF)signal and cascaded Mach-Zehnder modulators(MZMs)is proposed.The power operation circuit is used to mix the sinusoidal RF signal;The generated power RF signal drives the cascaded MZMs;And a flat OFC with adjustable comb number is produced by the cascaded MZMs modulated the input light.The theoretical model of OFC generated by power RF signal driven cascaded MZMs is established,and its performance is studied by using OptiSystem.The results show that the comb line interval of OFC is twice the frequency of RF signal source,which is tunable and expands the spectrum bandwidth;The target number of comb lines to generate OFC is 4times of the reference modulation voltage,thus the comb lines can be tuned;By adjusting the modulation and bias voltage difference between the upper and lower arms of MZM to the determined optimization value,the OFC flatness of different target comb numbers can be less than 0.95dB.

关 键 词：光通信 光学频率梳(OFC) 马赫-曾德尔调制器(MZM) 射频(RF)信号 

分 类 号：TN29[电子电信—物理电子学]