Big Gain Broadband Optical Parametric Amplifier

Along with the rapid expansion of DWDM in optical communication, opticalcommunication network put forword higher requirement for the signal gain, gainbandwidth and gain flatness of optical amplifier. At present, traditional optical amplifiercould not satisfy these demands. Fiber optical parametric amplifier (FOPA) whichbased on optical third nonlinear optical effect has the qualities of high gain, broadbandand phase-sensitive and has merit of producing idler frequency. And FOPA couldrealize most of all optical operation in optical communication system, so FOPA has awide range of application in DWDM system and all optical net work. This paper mainlydoes the single FOPA and CFOPA numerical analysis and simulation, executescomprehensive theory and simulation analysis in each parameter which affect the signaloutput gain, gain bandwidth and gain fitness of FOPA. Numerical and simulation resultsshow that cascade structure of periodic dispersion compensation could efficiently raisepeak gain, increase gain bandwidth and improve gain fitness. This paper mainly worksin the following aspects:(1) Introducing the optical fiber communication technology and its development,the role of optical amplifier in optical fiber communications and classify of opticalamplifier. The research background, working performance, the research presentsituation and the development trend of the FOPA are also summarized in the text.(2) Studying the basic principle of optical parametric amplifier. Optical parametricamplification is a kind of nonlinear effect based on FWM, this paper studies the energyconversion of FWM and analyzes the condition of phase matching. Parametricamplification in degenerate and not degenerate is also discussed.(3) Doing the theory analysis and simulation for single FOPA. Firstly, the outputgain expression and gain bandwidth expression of single FOPA are deduced making useof light wave coupled equations. Secondly, each parameter of pump source and HNLFis processed numerical analysis on the basis of output gain expression, the effects ofeach parameter to gain characteristic is showed through comparing the numerical results. Then, single FOPA simulation models are set up separately, several model parameterswhich affect gain characteristic are processed by simulation analysis which furtherproved the validity and feasibility of the numerical analysis. At last, several ways whichcan improve the gain characteristics is proposed on the basis of the numerical analysisand simulation analysis.(4) Doing the numerical analysis and simulation for CFOPA. Firstly, the outputgain expression of CFOPA is deduced on the basis of light wave coupled equations.Secondly, each parameter of the number of segments, pump source, DCF and HNLF isprocessed numerical analysis on the basis of output gain expression, the effects of eachparameter to gain characteristic is showed through comparing the numerical results.Finaly, CFOPA simulation models are set up separately, several model parameterswhich affect gain characteristic are processed by simulation analysis which furtherproved the validity and feasibility of the numerical analysis.