We demonstrate a simple dual wavelength ring erbium doped fiber laser operating in single lon gitudinal mode (SLM) at room temperature. A pair of reflection type short period fiber Bragg gratings (FBGs), which have two different center wavelengths of 1545.072 and 1545.284 nm, are used as the wave length selective component of the laser. A segment of unpumped polarization maintaining erbium doped fiber (PM EDF) is acted as a narrow multiband filter. By turning the polarization controller (PC) to enhance the polarization hole burning (PHB), the single wavelength and dual wavelength laser oscillations are observed at 1545.072 and 1545.284 nm. The output power variation is less than 0.6 dB for both wavelengths over a five minute period and the optical signal to noise ratio (OSNR) is greater than 50 dB. By beating the dual wavelengths at a photodetector (PD), a microwave signal at 26.44 GHz is demonstrated.

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In this paper, we demonstrate a simple switchable dual-wavelength ring erbium-doped fiber laser operating in single-longitudinal-mode (SLM) at room temperature. A pair of reflection type short-period fiber Bragg gratings (FBGs) is used as the wavelength-selective component of the laser. A segment of unpumped polarization maintaining erbium-doped fiber (PM-EDF) is acted as a narrow multiband filter. By turning the polarization controller (PC) to balance the gain and loss in the ring cavity, single-wavelength and dual-wavelength laser oscillations are observed. The output power variation is less than O.6dB for both wavelengths over a five-minute period and the optical signal to noise (ONSR) is greater than 50dB.