Analysis for amplifying characteristics of Er-Yb-co-doped microring resonators

Formulas of the transfer functions and the output power gains are presented, amplifying characteristics are analyzed, and simulation is performed for an Er³⁺-Yb³⁺-co-doped microring resonator. Under the pump wavelength of 980 nm and the central signal wavelength of 1550 nm, the dependence of the output power gain on the amplitude coupling ratio, pump power, signal power, and the dopant concentration is investigated, the output spectra are presented, and the optimization of the device is carried out. Simulated results show that the output power gain of this device is much larger than that of the Er³⁺-Yb³⁺-co-doped straight waveguide amplifier (EYCDWA) with the same waveguide parameters.