Abstract
Fused silica are common fiber materials which have macroscopic central symmetry without second-order nonlinearity. Studies have shown that thermal poling of fused silica fibers can destroy this macroscopic central symmetry, resulting in second-order nonlinearity or linear electro-optical effects. In this paper, a new type of double-hole optical fiber is designed. A two-dimensional (2D) numerical model is used to simulate the movement of ions and the formation of space charge region by finite element analysis. It is found that the single round square hole structure of the new double-hole fiber promotes the thermal poling process. The effective second-order nonlinear coefficient χ eff ( 2 ) of the new double-hole poled fiber is 0.28 pm/V at the core center, which is 0.05 pm/V higher than that of the circular double-hole poled fiber. In the fiber core, the radial distribution of the internal electric field and of χ eff ( 2 ) is calculated and analyzed. The results of this paper are of great significance for the application of thermally poled fibers on nonlinear all-fiber devices.
Highlights
Thermal poling, a technique to induce second-order nonlinear effects and linear electro-optic effects in the center-symmetric fused silica fiber [1], allows the realization of all-fiber electro-optic modulators, all-fiber optical-to-frequency converters [2], switching [3] and polarization-entangled photon pair generation [4]
To further understand the physical process based on the double anodes model and optimize its poling parameters, Camara studied the microscopic mechanism of ion movement in thermally poled double-hole fibers using COMSOL Multiphysics finite element analysis [8]
Based the two-dimensional carrier
Summary
Thermal poling, a technique to induce second-order nonlinear effects and linear electro-optic effects in the center-symmetric fused silica fiber [1], allows the realization of all-fiber electro-optic modulators, all-fiber optical-to-frequency converters [2], switching [3] and polarization-entangled photon pair generation [4]. To further understand the physical process based on the double anodes model and optimize its poling parameters, Camara studied the microscopic mechanism of ion movement in thermally poled double-hole fibers using COMSOL Multiphysics finite element analysis [8]. The impact of poling parameters (voltage, temperature, initial ionic concentrations, etc.) on the induced χeff is analyzed. A new type of double-hole fiber is designed, and the thermal poling process of this new double-hole fiber and circular double-hole fiber is analyzed by using COMSOL Multiphysics platform. This model is based on a previously proposed two-dimensional charge dynamics model [10]. The results show that the χeff of the new double-hole poled fiber is higher than that of the circular double-hole fiber at a temperature of 285 ◦ C and a voltage of 5 kV
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