Tunable dual-wavelength fiber laser based on adjustment of cavity loss by a fiber optic loop mirror

We experimentally demonstrate tunable dual wavelength operation of a fiber laser through adjustment of cavity loss using a Fiber Optical Loop Mirror (FOLM) with a high-birefringence fiber in the loop. The reflection adjustment of the FOLM was achieved by temperature control of the Hi-Bi fiber. The spectral spacing has been tuned from 0.98 to 5.6 nm with a tubable fiber Bragg grating. A temperature change of the Hi-Bi fiber by 0.1 °C causes a change in the reflectances for the wavelengths.