Noise-ifgure Analysis And Optimal Design Of Er³⁺-Yb³⁺ Co-doped Planar Optical Waveguide Ampliifers

With the rapid development of Internet applications and mobile appli-cations and other information exchanging forms, especially the proposal of“Broadband China” strategy, information consumption will be exploding. Thefiber network ushered in a period of rapid development. In this period of rapiddevelopment of communication network and related optical technologies, thebreakthroughs and optimizations of key technologies, such as: all-optical net-works, optical switches, optical modulators, couplers, WDM, waveguide am-plifiers and etc, becomes hot research field in research institutions or collegesand universities.As we known, the transmission of signals always causes a loss of sig-nal light. The optical amplifiers are used to enhance the signal light, to achievelongerdistanceandfasterspeedoftransmission. Withtheadvantagesofhighergainperunitlengthandgreaterenhancementtowardsthetransmissionwindow1535nm, the importantbranch of optical amplifier, erbium-ytterbium co-dopedwaveguide amplifier (EYCDWA) appeared. The two major elements of thestudy about EYCDWA are the methods to achieve better EYCDWA throw the-oretical researching and process improvements.The main works of the thesis are organized as follows: 1. By comparing of the energy structure and the gain between erbiumdoped waveguide amplifier (EDWA) and erbium-ytterbium co-dopedwaveguide amplifier (EYCDWA), we analyzed various factors whichcan affect the gain of device. Based on the energy transition, we ana-lyzed the impact of erbium-doped and erbium-ytterbium co-doped sys-tem’s energy structure. And considering the complexity of calculation,we made a reasonable simplification and streamlined into six energylevel structure. Through the analysis of six energy level structure, wededuced speed-transfer equations. And we used it as a theoretical ba-sis for the calculation of the output gain and noise figure of amplifierdevice.2. The EYCDWA based on phosphate glass as an example or applicationof the waveguide mode theory is analyzed, and the design of each pa-rameters and minimized its noise figure are optimized. Eventually, theparameter of amplifier is optimized, and the noise figure is controlledin reasonable range (lower than3dB).3. BaYF5:20%Yb3+2%Er3+BYF nanoparticlesaresynthesized, anditsmaterial’scharacterizationisanalyzedusingdifferentmethods. Thenan amplifier is manufactured using organic polymer material dopedwith the synthetic nanoparticles, and shows a better relative gain inour gain measurement system.Inthisthesis,thewaveguidemodetheoryisusedtoanalyzethewaveguideamplifierdevice,andtheeffectofnoisefigureisstudiedbyanalyzeeachrelatedfactors and it should be controlled below3dB in theoretical design. Mean-while, the mode theory is generalized to the design of erbium-ytterbium co- doped waveguide amplifier. With theoretical design and experimental study,BaYF5:20%Yb3+2%Er3+is synthesized and used as gain medium to man-ufacture amplifier, a relative gain104dB(wavelength of signal:@1525nm,device length:11cm) is achieved. This thesis provides a reference for theo-retical design and experimental study of EYCDWA.