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We demonstrate a dual-frequency Yb3+-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.
A low-noise narrow-linewidth distributed Bragg reflector (DBR) single frequency 1.5-$\mu \text{m}$ fiber laser with a complex optical-feedback loop (COFL) is demonstrated. The COFL is used to reduce the relative intensity noise (RIN) and narrow the linewidth, which is composed of an erbium-doped fiber amplifier (EDFA), an unpumped Er80 fiber and a sagnac loop mirror. The COFL combines the nonlinear...
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