The Fiber Optic Gyro Using The Y-branch Waveguide Proton Exchange And Annealing Studies

Y branches is important in the integrated optical devices unit, it is widely used in modulator, optical switching, optical splitter devices, especially in high-precision FOG.First, this paper has introduced the development situation of the integrated optics, and discussed the basic theory of FOG.Then, using the method of effective refractive index, discussed single-mode transmission conditions in Gaussian graded index waveguide. To the design of the Y-branch optic waveguide bending loss, the pure bending loss theory and the finite difference beam propagation method(FD-BPM) are used to analyze two kinds of Y-branch with different S-shaped channel waveguide bends by Matlab and get the optimization of the Y-branch waveguide profile. At last, the designing parameters of phase modulator are given.In the aspects of the fabrication of Y-branch, the proliferation theory is introduced to explain the proton exchange and anneal technique. From the perspective of the concentration of H⁺ analysed The Crystal structure and refractive index distribution of proton exchange LiNbO₃ waveguide are analysed from the perspective of the concentration of H⁺.The Kinetics principle is introduced to study the change of diffusion coefficient when buffer proton source is used. By comparing the characteristics of annealing and buffer proton source waveguide, then the formation conditions ofα-waveguide is given.At last, the whole procedure of fabrication device is described. The main optic parameters of Y branch such as insertion loss, split ratio and polarization crosstalk are tested.