摘要
提出了一种基于非均匀光频梳的多频率瞬时信号检测方案。以功率非均匀下降的光频梳功率比为参照,利用待测信号与光频梳的拍频功率比确定信号的频率范围,再由解调后的频率信息计算待测信号的精确频率。仿真实现了0~20 GHz范围内多频信号的瞬时测量,误差范围为0~23 MHz。此外,分析了激光器线宽、光纤布拉格光栅中心频率、调制器偏置电压和光混频器相差对测量结果的影响。结果显示:该系统对激光器线宽和混频器相差的改变不敏感,光纤布拉格光栅中心频率和调制器偏置电压会影响光频梳信号的功率比;当功率比区分度较大时,系统稳定性更高,误差更小。
This paper proposes a multi-frequency instantaneous signal detection scheme based on a non-uniform optical frequency comb. Furthermore, the paper takes the comb′s power ratio with non-uniform power drop as a reference,utilizes the beat frequency power ratio of the signal to be measured and the comb to determine the frequency range of the signal, and then calculates the exact frequency of the signal based on the demodulated frequency information. Through the simulation, the instantaneous measurement of multi-frequency signals in the range of 0-20 GHz is realized, with an error ranging from 0 to 23 MHz. In addition, the paper analyzes the effects of factors on the measurement results, such as the laser′s linewidth, the center frequency of fiber Bragg grating(FBG), the bias voltage of the electro-absorption modulator,and the phase difference of the optical hybrid coupler. Results show that the system is insensitive to changes in the laser′s linewidth and the phase difference of the coupler, but the center frequency of FBG and the bias voltage of the modulator can affect the power ratio of the comb signal. When the power ratio is different to a large extent, the system is more stable, and the error gets smaller.
作者
刘可欣
高娜
Liu Kexin;Gao Na(School of Physics&Electronic Information Engineering,Henan Polytechnic University,Jiaozuo 454003,Henan,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2022年第23期25-31,共7页
Acta Optica Sinica
基金
河南省科技攻关项目(222102210330,202102310299)。
关键词
光纤光学
射频光子学
瞬时频率测量
光频梳
光纤布拉格光栅
双平行马赫-曾德尔调制器
fiber optics
radio frequency photonics
instantaneous frequency measurement
optical frequency comb
fiber Bragg grating
dual parallel Mach-Zehnder modulator
