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A high peak-power and narrow-linewidth all-fiber Raman pulsed laser operating around 1.65 µm is introduced. A 1541 nm laser seed is modulated into pulse trains, which will be used as the Raman pump laser, by driving a reflective semiconductor optical amplifier (RSOA) with a continuous periodic square-wave voltage. A homemade high peak-power 1541 nm pulsed laser is employed to modulate and amplify a 1653.7 nm distributed feedback laser (DFB) seed synchronously in a segment of the 52-meter-long highly germania-doped fiber (HGDF). The repetition-rate and the pulse-width of the 1653.7 nm pulsed laser are 100 kHz and 31 ns, respectively. The peak power is estimated to be as high as about 30.85 W, and a 3-dB linewidth as narrow as less than 0.08 nm is achieved when the average power of 1541 nm pump is 3.1 W. The wavelength of Raman pulsed laser can be tuned from 1652.0 nm to 1654.0 nm continuously with an optical signal-to-noise ratio (OSNR) of more than 35 dB.

We presented a compact and enduring multiwavelength Tm‐doped fiber laser at 2 μm employing a microfiber knot resonator (MKR). The MKR, made by the flame‐brushing technique, has a fiber diameter of 10 μm and a ring diameter of 150 μm. The MKR plays a role as both the comb filter and the power equalization device, which is critical for the stable multiwavelength Tm‐doped fiber laser. By properly adjusting the pump power, three wavelength lasing channels (1956.2, 1964.4, and 1971.8 nm) were observed stable and their average power density was around −8.76 dBm with 1 W pump power. In addition, the channel spacing is 5.8 nm with the 3‐dB bandwidth of the channel smaller than 0.5 nm. The experiments demonstrated that the MKR can be utilized as a comb filter with the suitable transmission spectrum to reach a steady multiwavelength Tm‐doped fiber laser.

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A widely tunable single-longitudinal-mode (SLM) ytterbium-doped fiber laser is experimentally demonstrated, which is achieved by combining a fiber Lyot filter and a saturable absorber in a ring cavity. Stable SLM operation from 1045 nm to 1076 nm is obtained by properly adjusting the polarization state. The output power reaches 7.5 dBm with a fluctuation of less than 2 dB. The optical signal-to-noise ratio is 42.5 dB with a fluctuation of less than 6 dB in this wavelength range.