Abstract
Stable and tunable dual-wavelength erbium-doped fiber ring laser (EDFL) using a single fiber Bragg grating (FBG) and two coil heaters is proposed and demonstrated. Installing two identical coils into a single FBG, the FBG is symmetrically divided into two different portions. While a current supply to the coil, the refractive index of the FBG under the coil is changed. The FBG can operate as a joint of two different FBGs. Due to the thermo-optic effect of a fiber, the resonance wavelength split into two peaks. The spacing between two adjacent channels was changed as much as the difference of heating power. It was tuned up to 3 ㎚ of wavelength under the electrical power with a 1000 ㎽. Moreover, the lasing wavelength can be individually tuned without influencing to the adjacent channel.
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