Dual-frequency Yb 3+ -doped DBR fiber laser with 32 GHz frequency difference

We demonstrate a dual-frequency Yb 3+ -doped distributed Bragg reflection (DBR) fiber laser, using a homemade low reflectivity dual-wavelength fiber Bragg grating (FBG) as one of the cavity mirrors. The dual-frequency laser output is at 1063.09 nm and 1063.21 nm, with a beat frequency of 32.014 GHz.