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提出并制造一种新颖的椭圆芯中空光纤,采用热极化方法使其具有高二阶非线性,可用作相位调制器。该光纤在300℃温度、大于1×108 V/m强电场和9cm有效电极长度条件下热极化30min后,产生大的线性电光相移。基于双椭圆芯中空光纤构建一种纤内马赫-曾德尔干涉仪,通过观察干涉条纹的移动来评估相移,最终得到1.16pm/V的高二阶非线性系数和0.52pm/V的线性电光系数。该技术具有简单、灵活的特点,可以用来制作高电光系数器件,降低制作成本,并能进一步提高全光纤器件的集成度。
A new kind of elliptical core hollow fiber is proposed and manufactured. It uses the thermal polarization method to make it have high second-order nonlinearity and can be used as a phase modulator. The optical fiber produces a large linear electro-optic phase shift after being thermally polarized for 30 min at a temperature of 300 ° C. and a strong electric field of more than 1 × 108 V / m and an effective electrode length of 9 cm. An in-fiber Mach-Zehnder interferometer was constructed based on a double-elliptical core hollow fiber and the phase shift was evaluated by observing the movement of the interference fringes, resulting in a high second order nonlinear coefficient of 1.16 pm / V and a linear electro-optic coefficient of 0.52 pm / V . The technology is simple and flexible, can be used to make high electro-optical coefficient devices, reduce production costs, and can further improve the integration of all-optical devices.