Study On Key Technologies Of Broad-Band Er-Doped Optical Waveguide Amplifiers

The key technologies in the design and fabrication of broadband Er-Yb co-doped phosphate glass waveguide amplifiers(EYCDWA) are studied in this dissertation. The emphases are placed on calculation of the transverse distributions of signal and pump lights in waveguide amplifier, physic characteristics of EYCDWA(such as small/large signal gain, noise, quantum conversion efficiency and saturation absorption,etc), fabrication technique of ion-exchanged waveguides, measurement of EYCDWA, structure design of broadband waveguide amplifiers integrated with multilayer medium thin filter, and coating design of multiplayer medium thin filter. The main contents are as follows:1. The Finite-Differences Time-Domain based on Alternating-Direction Implicit Method(ADI-FDTD) is applied to waveguide calculation, the transverse distributions of signal and pump light in waveguide are obtained using ADI-FDTD. ADI-FDTD has the unconditional stability of implicit differences, as well as relative simplicity of explicit differences. It has a more wide suitable than traditional one.2. With the combination of ADI-FDTD, overlapping integral and RK method, we propose a novel algorithm to analyze Er-Yb co-doped phosphate glass waveguide amplifiers, which is called overlapping integral-RK method based on ADI-FDTD. This novel method first calculates the normalized eigen fields of signal and pump light in Er-Yb co-doped phosphate glass waveguide and the overlapping integral between light fields and the distribution of Er3+,Yb3+ concentrations. The distributions of power of signal, pump and ASE along waveguide are calculated by overlapping integral method. The advantage of which is avoiding the repeat calculation of normalized light fields at every step power calculation, and thus saves calculating workloads.3. Ignoring excited state absorption(ESA), by sovling the rate and power propagation equations, the effects of Er3+ concentrations, ratio of Yb3+/Er3+ ion concentrations, pump power, amplifier length and transverse profile of signal and pump light on gain and noise figure at small signal are studied, as well as the effects of Er3+ concentrations, ratio of Yb3+/Er3+ ion concentrations, pump power on the quantum conversion efficiency(QCE) of amplifiers at large signal operation, the saturation absorption characteristics and efficient approaches to improve the gain of amplifiers are discussed, it is demonstrated that the parameters of substrate and fabricatred waveguides have great effect on amplifier performance.4. Some planar waveguides, channel waveguides and buried waveguides in difference scale are fabricated in Er-Yb co-doped phosphate glass substrate. The fabricated techniques of Ag+ (?) Na+ , K+ (?) Na+ , Ag++K+ (?) Na+ , Ag++K++Na+(?) Na+Ag+(?) Na+ ,K+(?) Na+,Ag++K+(?) Na+, Ag++K++Na+(?)...