An Adjustable EIT-Based FBG in Yb:silica Master-Oscillator Fiber Power-Amplifier System

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 SiO
₂
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.