Research on integrated optic frequency converter with wavelength filter

提出了一种新型的集成波导波长滤光片的光学可调谐波长转换器。该器件主要由二次谐波部分和滤光片部分组成。在二次谐波部分，在波导轴上沿传播方向有两个周期域倒置区域pi相移，从基波最低阶对称模产生反同步的高次谐波光。在滤光器部分，由于非对称Y分支波导的模式分裂行为，基模和高次模式被分离。该滤光器部分还起到模式转换器的作用，使二次谐波的Y分支传播后的高阶模式转换为基模。我们对所提出的器件进行了分析，成功地制作了二次谐波部分。

We propose a new type of integrated optical tunable wavelength converter with waveguide wavelength filter.The device is basically consist of second harmonic section and filter section.In secondo harmonic section, two periodic domain inverted areas are pi phase-shifted at the center axis of waveguide along the propagating direction In this region second harmonic light with antisynmnetric higher order mode is generated from the lowest order symmetric mode at fundamental wavelength.In filter section fundamental and higher order modes are splitted because of the mode splitting behavior of non-symmmetric Y branching waveguides.This filter section also works as a mode converter so that after propagating the Y branching higher order mode of second harmonic wave is converted to fundamental mode.We analyzed the proposed devices and made the second harmonic section successfully.