Abstract
An adjustable continuous-wave single-mode double-clad ytterbium-doped silica fiber laser is numerically investigated in the form of a master-oscillator fiber power-amplifier array. An optically-tunable coupler is suggested based on the nonlinear electromagnetically induced transparency (EIT) within fiber Bragg grating. Here, the Si nanocrystals is embedded in SiO2 over the selected regions of the output coupler. The transmittance is adjusted using a low power control field by modulating the refractive index in the EIT material.
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