A new method for generation of terahertz (THz) signal by using the ±1 order Kelly sidebands of mode-locking (ML) fiber laser is proposed. A physical model is built up to characterize the sidebands. In experiment, the ±1 order Kelly sidebands with large and small spacing were obtained from two lab-made ML fiber lasers operating at 1550 nm and 1064 nm wavebands, respectively. By photomixing the ±1 order sidebands, experimental result showed that desired THz signals were generated at frequencies of 0.914THz and 0.187THz from the two lasers. It is found that the total dispersion and filtering bandwidth of the grating used in the laser cavity play significant roles in determining spacing and intensity of the ±1 order Kelly sidebands, which correspond to frequency and intensity of generated THz signals. Besides, bandwidth and stability of the ±1 order Kelly sidebands are investigated both theoretically and experimentally for their influence on the THz signal generation.

提出了一种利用锁模（ML）光纤激光器的±1阶凯利边带产生太赫兹（THz）信号的新方法。建立物理模型来表征边带。在实验中，从两个分别在1550 nm和1064 nm波段工作的实验室制造的ML光纤激光器获得了具有大和小间距的±1阶Kelly边带。通过对±1阶边带进行光混合，实验结果表明，两个激光器分别在0.914THz和0.187THz的频率下产生了所需的THz信号。发现在激光腔中使用的光栅的总色散和滤波带宽在确定±1级凯利边带的间隔和强度方面起着重要作用，这与所产生的太赫兹信号的频率和强度相对应。除了，