S-Type Er-Yb Co-doped Phosphate Glass Waveguide Amplifier Integrated with Thin-film Filter

A new S-type of wideband erbium-ytterbium co-doped phosphate glass waveguide amplifier integrated with medium thin film filter is proposed, this S-type geometry waveguide structure is used to achieve a long path in a compact chip, and obtained higher gain with lower Er-doped concentration, and the medium thin film filter is utilized to achieve the built-in suppression of 1.53pm gain peak to obtain larger flattening gain bandwidth. The intrinsical gain spectrum is obtained by solving rate and power propagation equations, the effect of transmittance spectrum of thin film filter on flattening gain is discussed.