Amplifying Characteristics of Er³⁺/Yb³⁺Co-Doped Parallel-Cascaded Double Microring Resonators

Abstract

In terms of the coupled mode theory, formulas of the transfer function and the output power gain are presented for an Er 3C /Yb 3C co-doped parallel-cascaded double microring resonator. Around the pump wavelength of 0.98 m and the central signal wavelength of 1.55 m, analysis is performed for the dependence of the output power gain on the pump power, signal power, dopant concentration, amplitude coupling ratio, and ring spacing. The results show that the output power gain of this device is much larger than that of the Er 3C /Yb 3C co-doped waveguide amplifier with identical waveguide lengths. In the case of the amplitude coupling ratio Ä D 0.064, ring spacing L 2 D 10 R, pump power P p0 D 8 mW, signal power P s0 D 37.2 W, Er 3C ion concentration N Er D 1 26 m 3 , and Yb 3C ion concentration N Y b D 3 27 m 3 , the device can produce higher signal power gain from 11.9 dB even up to 70 dB.