Research on integrated optic frequency converter with wavelength filter

提出了一种新型波导滤波器集成光可调谐波长转换器。该装置主要由二次谐波部分和滤波部分组成。在二次谐波部分，在波导中心轴线沿传播方向有两个周期畴反转区，在该区域，基波长处的最低阶对称模产生具有反同步高阶模的二次谐波光。由于非对称Y分支波导的分模特性，在滤光片中基模和高阶模发生了分模。该滤波器段还可作为模变换器，使二次谐波的Y分支高阶模在传播后转换为基模。我们对所提出的器件进行了分析，并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.