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A tunable and switchable six-wavelength erbium-doped fiber ring laser based on a fiber Bragg grating based FP filter (FBG-FPF) and a polarization-maintaining fiber Sagnac loop (PMFSL) is proposed and demonstrated experimentally at room temperature. The FBG-FPF with low insertion loss is used to generate dense multiwavelength output. The PMFSL acts as a comb filter and frequency stabilizer. Through adjusting the squeezed fiber polarization controllers, six kinds of single-wavelength with the tunable range of 11 nm, eleven kinds of dual-wavelength, three kinds of triple-wavelength and one kind of six-wavelength can be obtained and switched with one another. All lasing lines with 3 dB linewidth of less than 0.29 nm and optical signal-to-noise ratio of more than 22 dB locate in the range of C-and L-bands of the optical communication waveband.

A switchable triple-wavelength erbium-doped fiber laser based on a fiber Bragg grating filter (FBGF) and C-band 50 GHz interleaver is proposed and demonstrated experimentally at room temperature. The FBGF alone can only excite unstable multi-wavelengths. To obtain a stable multi-wavelength output, an interleaver with stationary wavelength spacing and the polarization hole burning effect are used; finally, the laser can switch flexibly to output three different modes from single-or dual-to triple-wavelength. All of the lasing lines with narrow linewidths have the optical signal-to-noise ratio of more than 20 dB, and locate at the wavelength positions in the range of about 1530 nm to 1533 nm. The laser with good light-intensity uniformity shows better stabilities with respect to the wavelength and peak power.

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A switchable dual-wavelength CW erbium-doped fiber laser with two cascaded fiber Bragg gratings has been proposed and demonstrated experimentally at room temperature. The laser uses a linear resonant cavity configuration incorporating a Sagnac loop with a polarization controller (PC) and can switch flexibly to output a single wavelength or dual wavelengths based on the polarization hole burning (PHB) effect. The slope efficiency and maximum output power can reach 23% and 96 mW, respectively. The two lasing peaks of the laser, with a narrow linewidth output and an optical signal-to-noise ratio of more than 50 dB, are located in the C and L bands of the optical communication window, respectively. The laser shows good stability with respect to the wavelength and output power.