Requirements for gain/oscillation in Yb³⁺/Er³⁺-codoped microring resonators

Abstract

A detailed model of the performance of a highly Yb 3+ /Er 3+ -codoped phosphate glass add-drop filter, which combines the propagation at resonance of both pump and signal powers inside the microring resonator with their interaction with the dopant ions, is used to analyze the requirements for gain/oscillation in these structures. Special attention is paid to the influence of additional coupling losses and asymmetry between the input/output couplers. It is concluded that, due to small signal gain saturation and the limited range of pump amplitude coupling coefficients, asymmetry does not greatly influence gain/oscillation requirements through the pump intensity build-up inside the ring. Asymmetry effect on small signal intensity transfer rate and threshold gain instead allows a significant lightening of the demanding doping ions concentrations requirements to achieve oscillation.

Optimized Design of Yb3+/Er3+-Codoped Phosphate Microring Resonator Amplifiers

“…An active MRR was described by using a formalism for the intensity rates of the optical powers (pump and signal) at resonance affected by their interaction with the dopant ions through absorption/emission processes. Thus, the performance of an active MRR could be calculated in order to analyse its optimized design and to determine the conditions to achieve amplification and oscillation [20,21].…”

“…Evolution with Δκ r ,s 0 of the dependence of net gain with g s for κ 1,s 0 = 0.1 and Γ 1,s = 0.005[21].…”

“…Variations in the threshold signal gain coefficient, g th , as a function of Δκ r ,s 0 for different combinations of (κ 1,s 0 , Γ 1,s )[21].…”