摘要
提出并实现了一种基于色散调谐主动锁模光纤激光器技术的多普勒频移测量方法,该方法利用大色散谐振腔主动锁模激光器的输出波长与调制频率呈线性这一特性,通过测量锁模激光器输出波长来标定输入系统的微波频率,进而获得多普勒频移.通过模拟仿真,分析了激光器腔长、色散量以及锁模阶数等参量对系统频率测量特性的影响,在理论指导下,针对不同应用场景设计了分别基于长光纤及线性啁啾布拉格光纤光栅的大色散谐振腔结构,实现了载波中心频率分别为12.2 MHz、265 MHz、682 MHz和1.1187 GHz情况下的频率偏移测量.所提出的测量方法具有结构简单、设计灵活的优点,在多普勒频移测量方面具有应用价值.
A novel method for measuring Doppler Frequency Shift(DFS)based on dispersion-tuned Actively Mode-Locked Fiber Laser(AMLFL)technique is proposed and successfully demonstrated.The measurement principle is based on the fact that the output wavelength of the actively mode-locked fiber laser is linearly related to the Radio Frequency(RF)applied to the modulator in the laser cavity with large dispersion,so that the input frequency and further the DFS can be obtained by measuring the output wavelength of the AMLFL.Influences of system parameters such as the laser cavity length,dispersion,and mode-locked orders on the system performance are theoretically analyzed.Under the guidance of the simulation and for different application condition,two experiments are designed respectively based on long Dispersion-compensated Fiber(DCF)and Linearly Chirped Fiber Bragg Grating(LC-FBG)to provide large dispersion,and DFS measurements are conducted when the carrier frequencies are respectively12.2 MHz,265 MHz,682 MHz and 1.1187 GHz.The technique has advantages of simple configuration and flexible design,and may have potential application in measurement of Doppler frequency shift.
作者
李依丹
曹元
王旭东
张杰君
冯新焕
关柏鸥
LI Yi-dan;CAO Yuan;WANG Xu-dong;ZHANG Jie-jun;FENG Xin-huan;GUAN Bai-ou(Institute of Photonic Technology,Jinan University,Guangzhou 511486,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2020年第11期190-199,共10页
Acta Photonica Sinica
基金
国家自然科学基金(Nos.61771221,61860206002,61701193)。
关键词
色散调谐
锁模光纤激光器
微波光子
多普勒频移
频率测量
Dispersion-turned
Actively mode-locked fiber laser
Microwave photonics
Doppler frequency shift
Frequency measurement
