We report a single-frequency fiber laser using a saturable absorber Incorporated subring cavity as mode filters. The linear-cavity based fiber laser is constructed using an optical circulator and a partial reflectance fiber Bragg grating as the cavity ends. At 1550.82 nm, the laser output is 6.25 dBm and the signal-to-noise-ratio is 53.2 dB and with linewidth less than 1 MHz in stable operation. The pumping efficiency is 10% improved by recycling the residual pump power to gain medium.
展开▼
