A high-power multi-wavelength comb laser source

We present a simple method to generate a stable high-power (> 30 dBm) multi-wavelength ytterbium / erbium co-doped double-cladding fiber ring laser source at room temperature. This method is based a wavelength-dependent filter through spatial mode beating between the LP 01 and LP 11 modes within the multimode fiber section. We also investigate the relationship between the lasing wavelengths and the length of the ytterbium /erbium fibers (YEFs), the number of lasing wavelength lines dependent on the total pumping power level and the polarization states, and the characteristics of both the wavelength switching operation and the total output power. Eight simultaneous lasing wavelengths with 0.78 nm spacing were generated at room temperature.