Switchable quadruple-wavelength Erbium-doped fiber laser based on a chirped fiber grating and polarization-maintaining fiber

Abstract

A switchable quadruple-wavelength Erbium-doped fiber laser based on two Sagnac loops with a chirped fiber grating and polarization-maintaining fiber is proposed and demonstrated experimentally at room temperature. The two loops act as comb filters to excite multi-wavelength output. On the basis of the polarization hole burning effect, the laser can switch flexibly to output ten different modes from single-wavelength to quadruple-wavelength. All of the lasing lines with narrow linewidth have the optical signal-to-noise ratio of more than 35dB. The laser with good power uniformity shows better stability with respect to the wavelength and peak power.