A stable and narrow-linewidth, continuous wave and active Q-switching erbium-doped fiber laser, incorporating a fiber Bragg grating and a fiber Fabry-Perot tunable filter, was designed and experimentally implemented. Here, we proposed combining three approaches to suppress the mode hopping and improve both the output power stability and narrow the linewidth: first, two narrow-band optical filters, fiber Bragg grating and Fabry-Perot tunable filter were utilized in the laser cavity; second, the cavity configuration was optimized as a function of the output coupling ratio; finally, a 1.5 m long segment of unpumped erbium-doped fiber was inserted in the cavity to act as an induced virtual long and weak fiber Bragg grating. Using a 90% output coupling ratio, and monitoring over 120 min at room temperature, the 3 dB linewidth and power fluctuation of the fiber laser emission at 1550 nm were 16 kHz and 0.0025 dB respectively. Also, an optical signal to noise ratio (OSNR) of 82 dB was obtained. Keeping the same fiber laser configuration, laser pulses were also obtained using the Q-switching technique, realized by using dynamic spectral overlapping between the Bragg grating and the tunable filter. A stable output peak power of 5.6 W was achieved with a pulse width of 450 ns at a repetition rate of 1 kHz.

设计并实验实现了一种稳定且窄线宽，连续波和有源Q开关掺-光纤激光器，该光纤激光器装有光纤布拉格光栅和光纤Fabry-Perot可调滤光片。在这里，我们提出了三种方法的组合以抑制模式跳变并提高输出功率稳定性和缩小线宽：首先，在激光腔中使用了两个窄带光学滤波器，光纤布拉格光栅和Fabry-Perot可调滤波器。其次，根据输出耦合比优化腔结构。最后，将1.5 m长的未泵浦掺-光纤段插入腔中，以充当诱发的虚拟长而弱的布拉格光纤光栅。使用90％的输出耦合比，并在室温下监控120分钟以上，光纤激光器在1550 nm处的3 dB线宽和功率波动分别为16 kHz和0.0025 dB。另外，获得了82 dB的光信噪比（OSNR）。保持相同的光纤激光器配置，也可以使用Q切换技术获得激光脉冲，该技术是通过使用布拉格光栅和可调滤波器之间的动态光谱重叠实现的。脉冲宽度为450 ns，重复频率为1 kHz时，可获得5.6 W的稳定输出峰值功率。