Er ~ (3 +), Yb (3 +) Co-doped Phosphate High-gain Optical Waveguide Production Technology Research

With the rapid development of optical communication technology, optical waveguide amplifiers used for high gain, small volume, compact structure, convenient integration and low loss optical communications have drawn more and more attentions. Based on the research condition at my laboratory, my dissertation focuses on the fabrication of high performance active optical waveguides in Er³⁺/Yb³⁺ co-doped phosphate glass. Starting from the glass structure and ion-exchange technique, the theory about fabrication of optical waveguides by thermal ion-exchanged and field-assisted ion-exchanged technology has been discussed. The distribution characteristics of refractive profiles fabricated with the two technologies have been researched through the diffusion equation. And the characteristics of the refractive profiles have been authenticated by the experiment results. The numerical calculation about optical waveguides'typical refractive index distribution, which were fabricated by thermal ion-exchange and field-assisted ion-exchange has been done. The numerical results show that the optical waveguide fabricated by electric field-assisted ion exchange technology with step-index profile better confines the optical field. It is more advantageous to fabricate active optical devices and integrateed optical devices . Through considerable number of experiments, comparing the different effects of the waveguides quantity of molten salt and exchange temperature, an optimized molten salts'proportion and temperature controlled schemes have been founded. A feasible experiment scheme of field-assisted ion-exchange has been designed, which was perfectly carried out in the experiment discussed in this paper. By using this scheme we have succeeded in fabracting Er³⁺/Yb³⁺ co-doped phosphate planar optical waveguides, channel waveguides and buried waveguides. Through theoretical analysis we found that the silver film ion-exchange technology can fabricate high quality optical waveguides, and it fits fabrication of active waveguides. In this dissertation a feasible experimeng scheme of silver film ion-exchange technology to fabricate active waveguides has been designed,and have done initial research in experiment.