A single-longitudinal-mode ring thulium/holmium co-doped fiber laser (THDFL) possessing the switchable single- and dual-wavelength outputs is proposed with two subring cavities and two polarization-maintaining fiber Bragg gratings. The switching operation is realized by tuning the pump power and polarization controller together. When the THDFL working at single-wavelength output state, the optical signal-to-noise ratio (OSNR) is ∼51 dB, and the maximum power and wavelength fluctuation within 1 h are 0.804 dB and 0.04 nm, respectively. Using the phase noise analysis-based linewidth measurement system, the linewidth is measured to be 0.16 MHz with a measuring time of 0.002 s. When the THDFL working at dual-wavelength output state, the OSNR is ∼55 dB, and the maximum power and wavelength fluctuation within 1 h are 0.802 dB and 0.05 nm, respectively. The proposed THDFL may find wide applications in microwave photonics generation and optical fiber laser sensor.

提出了一种具有可切换的单波长和双波长输出的单纵模环形铥/钬共掺杂光纤激光器 (THDFL)，该激光器具有两个子环腔和两个保偏光纤布拉格光栅。开关操作是通过一起调谐泵浦功率和偏振控制器来实现的。当THDFL工作在单波长输出状态时，光信噪比（OSNR）为~51 dB，1小时内的最大功率和波长波动分别为0.804 dB和0.04 nm。使用基于相位噪声分析的线宽测量系统，线宽测量为0.16 MHz，测量时间为0.002 s。当THDFL工作在双波长输出状态时，OSNR为~55 dB，1小时内的最大功率和波长波动分别为0.802 dB和0.05 nm。