Nuclear Explosion Simulation With The Integrated Optical Intensity Modulator

With the development of fiber-optic communication systems and fiber-optic sensors, the LiNbO₃ integrated optical intensity modulators consisting of M-Z optical waveguide and CPW modulation electrode structure get an extensively application. Because of its excellent electro-optic effect, very short electro-optical response time, and wide transparent wavelength range, LiNbO₃ material meet the demands of low-loss, low drive voltage, high-speed and wide-band intensity modulator. As far the trend of fiber-optic communication systems is to obtain higher capacity, and higher transmission speed. The intensity modulator is widely applied to a lot of fields. It is necessary for the intensity modulator subject to the laser pulse rectification systems that should be provided with following performances as high speed signal transmission and quick response and so on. So the application prospects of LiNbO₃ integrated optic intensity modulators are getting better.Two-section cascaded LN intensity modulator applied to laser pulse rectification is presented in this thesis. It is constituted with two-section M-Z optical waveguide and CPW traveling-wave modulation electrode. The specifications of the intensity modulator at 1.054μm involved with extinction ratio better than 50 dB, and low drive voltage, and wide operation band width and so on.Based on optical waveguide theory and electro-optic effect, the structure of the intensity modulator, fabrication technique, and measurement technology are studied intensively.The optical waveguide characteristics such as waveguide mode field profile, and the mode cut-off conditions, and the waveguide dispersion are analyzed with the solution of a certain wave equation.The mechanism of index ellipsoid of LiNbO₃ crystal distorted with an external applied electric field by means of the electro-optic tensor as investigated. Based on the operation principle of M-Z waveguide, the operation mechanism of the two-section cascaded M-Z waveguide and of the modulation electrode are...