鈮酸鋰低半波電壓調(diào)制器研究
[Abstract]:The electro-optic modulator is one of the key devices in optical communication, optical sensing and optical information processing. At present, electro-optic modulators are basically made of inorganic crystal lithium niobate (LiNbO3,LN) because LN has a large electro-optic coefficient and good optical transparency in a wide wavelength range (450 nm-4500 nm). And has mature waveguide fabrication technology. In the application of electro-optic modulator, in order to reduce the power consumption of the system, improve the performance of the device, and easily integrate with other parts of the system, the electro-optic modulator is usually required to have a low half-wave voltage. Therefore, in the field of electro-optic modulator, reducing the half-wave voltage is an important research direction. In order to achieve low half-wave voltage, the most effective method for LN electro-optic modulator is to use a longer electrode to increase the length of the electro-optic action zone, but this will inevitably increase the length of the device. It is unfavorable to the fabrication of the device and the integration of the system. In addition, by optimizing the design of waveguides and electrodes, such as increasing the overlap integral between modulated electric field and light field by ridge waveguide, it is also a method to reduce half-wave voltage, but this will lead to complex process. And the reduction of half wave voltage is very limited. Therefore, in this paper, we study the reduction of half-wave voltage of LN electro-optic modulator, and explore the principle of realizing low half-wave voltage using reflection structure. The LN crystal with x cut y is used as material, and the way of proton exchange is annealed. The fabrication technology and related testing technology of reflective LN electro-optic modulator are studied. The main work and results are as follows: 1. In this paper, the basic principle of the reflected LN low half-wave voltage electro-optic modulator is studied. Firstly, the basic principles of the LN phase modulator and the intensity modulator of the Mach-Zehnder,M-Z interferometer are analyzed. Then, the method of reducing half-wave voltage of LN modulator is discussed, and the basic principle of reflected LN low-half-wave voltage electro-optic modulator is analyzed. In addition, the waveguide Fabry-Perot cavity (Fabry P 茅 rot,F-P) has been fabricated by coating two ends of the LN optical waveguide, and its transmission characteristics have been studied. 2. Theoretical Analysis and Fabrication Technology of annealed Proton Exchange LN Optical waveguides the design of LN optical waveguides is studied by using the effective refractive index method and the parameters of the single-mode LN optical waveguides are determined. Then the fabrication technology of LN optical waveguide based on annealed proton exchange is studied. After a lot of experiments, the process conditions of making qualified LN single-mode optical waveguide are obtained. Finally, the experimental parameters are optimized by studying the effective refractive index of LN at a wavelength of 1538.3 nm, and the effects of switching time and annealing time on the optical waveguide are studied. Finally, the process conditions of realizing low loss LN optical waveguide are obtained. The design of 3.LN reflective electro-optic modulator is given. According to the working principle of reflective LN electro-optic modulator, the corresponding device structure parameters are designed. The photolithography mask is made according to these parameters, and the reflective LN phase modulator, intensity modulator and LN optical waveguide F-P cavity are fabricated by using the annealing proton exchange process. The optical characteristics, electro-optic modulation characteristics and half-wave voltage of the LN modulator are tested. The results show that the reflected LN electro-optic modulator can achieve a half-wave voltage of 4 V. The transmission spectrum characteristics of an 800 渭 m LN optical waveguide F-P resonator are measured.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TN761
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