Theory And Design Of Er～(3+)-doped Optical Waveguide Amplifier

With the development of optical fiber communication and integrated optoelectronics, Er3~-doped optical waveguide amplifier (EDWA) becomes the hotspot of study and application in the field of optical fiber communication and optoelectronics. The purpose of the paper is to study the optical characteristics and parameter design of EDWA. Firstly, the paper introduces the historical developments, the new achievements, and the main points of EDFA and EDWA in the field of optical fiber and waveguide amplifier in recent years, . According to Maxwell equations, We calculate the propagating mode of the passive medium planar waveguide and rectangle waveguide. Light-intensity distribution and guide- mode equations are presented in detail. According to the equations, We design the optimum geometry structure parameters of rectangle wave-guide based on requirement of EDWA. We analyze concretely optical characteristics of Er3~- doped optical waveguide as well as the effects of three different pumping wavelengths (980nm, 1480nm, and 820nm) on the performance of EDWA. The 4 rate equations and propagating equations are presented respectively according to different pumping wavelength. We calculate signal gains of three kinds of pumping wavelength, and analyze the relations of amplifier gains versus waveguide length, Er3~-doped concentration and input-pumping power, and explain the effects by their existing 桬SA(excitated state absorption) and CUP(cooperative upconversion processes). The optimum Er3~-doped concentration. waveguide length and pumping power are presented. These data provide theoretical reference and practical parameters. At the end of the paper I summarize some of the theory and prospect the application of ED WA.