Niobium The Lithium Phase Modulator Of Key Technologies

Lithium niobate phase modulator has been widely used in the fiber communication,fiber sensing and some other areas. In fabricating of the device, some key technologies including the waveguide, v-groove, coupling, packing and the reliability of the device are very important in improving the performance of the device.First, the principle of electro-optic modulator is introduced. The significance of some key technologies in the Lithium niobate phase modulator are expounded, and the status quo of the device are summarized. After analyzing the characteristics of the lithium niobate crystal and the principle of electro-optic phase modulation & the coupling of single-mode fiber with optical waveguide, the fabrication of the single-mode lithium niobate bar waveguide and v-groove has been studied, The new project in which the lithium niobate v-groove is used for the coupling of the single-mode fiber with optical waveguide is put forward. With the existing condition, The bar waveguide on the lithium niobate wafer with liquid phase proton-exchanged method has been fabricated and the benzoic acid is used as the proton source.A series of research on the domain inversion in lithium niobate crystal with proton-exchanged method have been done. And then the operation and the process of domain inversion in lithium niobate crystal with proton-exchanged method has been used. The electro-optic phase modulator with tail fiber has been designed and fabricated, and the packing of the device has been completed. And also the problems found in the experiment have been analysed and the solved project is put forword.With the existing condition, the insertion loss and reliability of the device have been tested, the invalidation factor has been analysed, and the improving method in theory with reliability engineering means during the whole process has been put forward. All of these lay on foundation for the improvement of reliability and the utility of the device .