具有32 GHz频差的掺Yb3+双频DBR光纤激光器

基于自制的双波长低反射率光纤光栅（FBG）作为分布式布拉格反射激光器（DBR）的输出端，实现了掺Yb3+双频DBR光纤激光器。该FBG的双波长间隔为0.12 nm，对应的频差为32 GHz。双频光纤激光器输出的两个波长分别为1 063.09 nm和1 063.21 nm，光谱信噪比大于60 dB。每一个波长只包含一个纵模。两个纵模的拍频信号为32.014 GHz，频谱信噪比大于35 dB。得益于光纤激光器本身具有结构紧凑，抗干扰能力强等特点，该型激光器有望作为高品质，小型化的微波信号源，用于微波传感和通信等领域。

Dual-frequency Yb3+-doped DBR fiber laser with 32 GHz frequency difference

A dual-frequency Yb3+-doped distributed Bragg reflection (DBR) fiber laser was demonstrated, which used a home-made dual-wavelength low reflectivity FBG as the output port of the DBR fiber laser. The wavelength spacing of the FBG was about 0.12 nm, corresponding to 32 GHz frequency difference. The dual-wavelength of the laser output was 1 063.09 nm and 1 063.21 nm, respectively. The spectral signal noise ratio was more than 60 dB. Each of the wavelengths included only one longitudinal mode. The beat frequency of the dual-frequency was 32.014 GHz. The signal-noise ratio of the frequency spectrum was more than 35 dB. Benefitted from the compact structure and the strong anti-interference capability of the fiber laser, the dual-frequency fiber laser is promising as the candidate of high-quality microwave signal generator for the applications such as microwave sensing and communications.